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Operator
Good day, ladies and gentlemen, and welcome to the Diamondback Energy and Viper Energy Partners' fourth-quarter 2014 earnings conference call. At this time all participants are in a listen-only mode. Later we will conduct a question-and-answer session, and instructions will follow at that time. (Operator Instructions)
As a reminder, this conference is being recorded. I would now like to introduce your host for today's conference, Mr. Adam Lawlis of Investor Relations. Sir, you may begin.
Adam Lawlis - IR
Thank you. Good morning and welcome to Diamondback Energy and Viper Energy Partners' joint fourth-quarter and year-end 2014 conference call. During our call today we will reference an updated investor presentation, which can be found on Diamondback's website. We also posted an investor presentation for Viper on its website. Representing Diamondback today are Travis Stice, CEO; Tracy Dick, CFO; as well as other members of our exec team.
During this conference call the participants may make certain forward-looking statements relating to the Company's financial condition, results of operations, plans, objectives, future performance, and businesses. We caution you that actual results could differ materially from those that are indicated in these forward-looking statements, due to a variety of factors. Information concerning these factors can be found in the Company's filings with the SEC.
I'll now turn the call over to Travis Stice.
Travis Stice - President, CEO, and Director
Thank you, Adam. Welcome, everyone, and thank you all for listening to Diamondback's and Viper Energy Partners' fourth-quarter 2014 conference call. Last month in our operations update, we announced fourth-quarter production, 2015 guidance, and encouraging Lower Spraberry results.
Last night we announced additional encouraging Lower Spraberry results, including our first 500-foot interlateral downspacing test, which is performing in line with the nearby three-well pad on 660-foot spacing. We believe our second Lower Spraberry test in Andrews County and our first test in Dawson County confirmed the strength of the Spraberry formation across the majority of our acreage. As a result of continued strong Lower Spraberry well results, Ryder Scott has increased our PUD reserve levels for a 7,500-foot lateral in Midland County to 990,000 BOE equivalent on a two-stream basis from 650,000 BOE previously.
Considering that we built Diamondback Energy on the back of the Wolfcamp B Shale, it's really exciting to embark on yet another development horizon which appears to be materially better than the Wolfcamp B. We also reported reserves in which we showed proved reserves increasing year over year by 77%, up to 113 million barrels of oil equivalent at an associated drill bit finding and development cost of $11.09 per barrel.
Proved developed reserves increased 122% over last year's to 66.5 million barrels. Additionally, last month we strengthened our already strong balance sheet by issuing equity. Pro forma for the proceeds from the equity raise, our net debt to annualized 4Q 2014 EBITDA now sits at 1.2 times.
Now, turning to the Company presentation Adam referred to: in slide 4 we depict how, at $50 per barrel, WTI Lower Spraberry rates of return in Spanish Trail range from approximately 50% to 125% based on the new Ryder Scott estimate of nearly 1 million barrels of oil equivalent per 7,500-foot lateral. Our Spanish Trail Lower Spraberry wells have a breakeven price below $30 a barrel. 65% to 75% of our drilling activity in Spanish Trail this year will target the Lower Spraberry.
On slide 5 we have provided more detailed information on our type curve expectations across our acreage base. Note that several wells, although early on in their production, are outperforming the Ryder Scott type curve.
On Slide 7 we show our historical reserve growth. Since 2012 reserves had increased 181%. F&D costs had decreased to $11.09 per barrel during 2014 from $14.46 per barrel in 2013. This is a reduction in F&D of almost 25%. Reflecting the early promising results, the Lower Spraberry booked at higher EUR per well than last year.
As depicted in slide 9, Diamondback continues to have higher cash margins and lower operating expense metrics than our Permian peers. We are a lean organization and expect to continue optimizing our costs. Our full-year 2014 LOE per barrel was $7.79, which was above guidance of $6.00 to $7.00 per barrel. This was due to the nearly 300 vertical wells acquired during 2014 on leases which had substantially higher operating costs.
If you strip out the acquired properties, full-year 2014 LOE would have been $6.87 per barrel -- within the guided range. This past quarter was the first to have the full impact from the properties that closed in September. We are working hard to apply our low-cost, efficient practices on these properties and expect to average between $6.50 and $7.50 per barrel in 2015.
Slide 10 shows how our vertical wells and LOE per barrel have changed since the fourth quarter of 2012. In 2013 we decreased LOE from $11.39 to $6.04 in the fourth quarter, as we increased the amount of horizontal wells drilled and drove costs lower. We are confident we can replicate this success and expect to see cost savings from reductions in well failure rates and other LOE spend categories.
As mentioned in our interim operations update, our focus this year is on capital discipline, stockholder returns, and maintaining a strong balance sheet. As previously reported, we are in the process of dropping two horizontal rigs this month and have already released our remaining vertical rig. In 2015 we expect to run three horizontal rigs, including two in Spanish Trail, where Viper owns the underlying minerals.
Slide 12 shows how the Permian rig count and WTI prices have changed since 2001. Since the beginning of 2015, Permian operators have dropped approximately 140 rigs. Cost concessions are responding to the lower commodity environment, and we are currently seeing approximately 10% to 15% overall reductions. Frac spreads have been slow to respond due to the backlog of completions, but we are beginning to see them react as well.
Of our nearly 1,650 net potential horizontal locations in inventory, shown in slide 16, less than 4% are currently booked as PUDs. Assuming the midpoint of EUR ranges, we have over 800 million barrels of resource potential remaining based on net locations in our inventory.
With these comments now complete, I'll turn to call over to Tracy.
Tracy Dick - SVP and CFO
Thank you, Travis. Diamondback's net income for the quarter was $98.7 million or $1.74 per diluted share. After adjusting our fourth-quarter earnings for non-cash mark-to-market derivative gains of $111.5 million and netting out the related income tax effect, our adjusted net income was $27.3 million or $0.48 per diluted share.
Diamondback's adjusted EBITDA for the quarter was $111.7 million. Our average realized price for the fourth quarter was $55.60 per BOE. And due to the positive impact of our hedge position, our average realized price including the effect of hedges was $62.63 per BOE.
We laid out the details of our current hedge position in last night's earning release and on slide 19 of the presentation. In 2015 we have nearly 11,000 barrels a day of oil hedged with swaps at an average price of approximately $88 per barrel.
Turning to costs, our LOE was $7.79 per BOE for the full year. As Travis mentioned, fourth quarter was the first quarter with the full effect of both acquisitions. Excluding the effect of the acquisitions, LOE for the year would have been $6.87 per BOE, within our guidance range.
Our general and administrative costs came in at $2.65 per BOE for the fourth quarter. This includes non-cash equity-based compensation. Excluding equity comp, G&A is $1.02 per BOE. In the fourth quarter of 2014 Diamondback generated $104.4 million of operating cash flow and $106.8 million of discretionary cash flow, or $1.83 and $1.87 per diluted share, respectively.
During 2014 we spent approximately $487 million for drilling, completion, and infrastructure. Our capital spend drove production, which exceeded the high end of our production guidance. As of January 30, 2015, we had $128 million drawn on our secured revolving credit facility after paying down part of the balance with proceeds from our recent equity raise. Last year our lenders approved a borrowing base increase of 114% to $750 million, but we elected to limit the commitment to $500 million, which we believe provides plenty of liquidity.
We estimate our 2015 year-end debt to EBITDA will be less than 2 times. At current commodity prices and with the current drilling program, we expect that we will turn cash flow positive in the second half of this year.
On Slide 20 we detail out our guidance for 2015. As previously announced, we expect 2015 production to range between 26,000 and 28,000 BOE per day. This includes a range of 4,200 to 4,500 BOE per day attributable to Viper.
Turning to operating costs, our 2015 LOE is guided to the range of $6.50 to $7.50 per BOE. Our cash G&A projection is $1.00 to $2.00 per BOE, and our non-cash equity compensation is also expected to be in the range of $1.00 to $2.00 per BOE. We have forecasted our DD&A rate between $20 to $22 per BOE, and production and ad valorem taxes are guided at 7.1% of revenue. In 2015 we expect our capital spend to be in the range of $400 million to $450 million.
I'll now turn briefly to Viper Energy Partners, which recently announced a cash distribution of $0.25 per unit for the fourth quarter. During the quarter cash available for distribution was $20 million, and production increased 24% quarter over quarter to 4,200 BOE per day. Viper has no debt and an undrawn revolver of $110 million as of December 31, 2014.
Turning to Viper's guidance, we expect 2015 volumes in a range of 4,200 to 4,500 BOE per day. Production and ad valorem tax is approximately 7.5% of revenue. Our cash G&A projection is $1.00 to $2.00 per BOE, and our non-cash unit-based compensation is expected to be in the range of $2.00 to $3.00 per BOE. DD&A is expected to be $20 to $22 per BOE. And as a reminder, Viper does not incur lease operating expenses or capital expenditures.
I'll now turn the call back over to Travis for his closing remarks.
Travis Stice - President, CEO, and Director
Thank you, Tracy. To summarize, our track record of capital discipline, stockholder returns, and maintaining our strong balance sheet has prepared us for this downturn. The Lower Spraberry shale is delivering exceptional results, and we've increased our reserves substantially over last year at a very low F&D cost.
Our focus on costs, expenses, and execution has never wavered. And we continue to deliver cash margins per barrel and low expenses at the top of our peer group. With our low-cost structure and our ownership of minerals through Viper, we believe that we will generate significantly higher returns than most.
We remain committed to growing the Company through accretive transactions. I believe that it is in these challenging times that great companies are made, and Diamondback Energy remains a low-cost producer in the highest-return basin.
Before I open the call for questions, I want to pause and acknowledge our employees for all they accomplished last year and have already accomplished this year. Even though we were in tough times with respect to commodity prices, I firmly believe our best is yet to come. Operator, please open the call to questions.
Operator
(Operator Instructions) David Amoss, IBERIA Capital Partners.
David Amoss - Analyst
Travis, just wanted to see if I could get an update on what the pressure pumping backlog looks like in the basin right now? I know you talked about it about a month ago. Have you seen any improvement, or where does that sit kind of on a relative basis versus where you were a month ago?
Travis Stice - President, CEO, and Director
I think our friends on the pressure pumping side are probably the best to answer that. I can tell you from the operators' perspective, though, there's still quite a bit of backlog of completions that are really reflective of the really high activity levels in the third quarter and fourth quarter of last year.
That being said, though, while 2014 -- you know, at the end of 2014 we weren't seeing much cost movement on the pressure pumping side. And really even -- even, honestly, into the month of January, they were still a little bit slow to respond.
I'll tell you, starting almost February 1, we've started to see some cost concessions. And we anticipate new improvements in cost, not only from the pressure pumping guys but really the rest of the service sector, probably through the next couple of quarters.
David Amoss - Analyst
Okay. And then as a reaction, when could or would you start to defer completions if you are not getting the traction?
Travis Stice - President, CEO, and Director
David, that's a real good question. And quite honestly, as we were exiting 2014 and not getting the cost concessions that I thought were reflective of $45 oil, we started deferring some completions. We had a dedicated frac crew we let go, and we're furloughing about a third of the days currently in the month right now -- deferring some completions.
And we'll continue to kind of build a small backlog of maybe a dozen or so or less wells, until we can get the cost concessions that I believe are reflective of $50 oil. And at that time we will potentially pick activity back up on the completion side. But that also is a pretty common phenomenon I'm hearing around the basin as well, which I think is probably why we started seeing some movement in costs effective February 1.
David Amoss - Analyst
All right. That's really helpful. Thank you. Congratulations, guys, on a great quarter.
Operator
David Kistler, Simmons & Company.
David Kistler - Analyst
Looking at the downspacing results in the Lower Spraberry that were impressive and certainly add to your inventory, can we assume that you would expect to see similar results in the Wolfcamp B, given similar rock qualities or maybe even slightly lesser rock quality than the Lower Spraberry?
Travis Stice - President, CEO, and Director
You know, Dave, that's certainly something we are looking at pretty hard here internally. I can tell you right now, our current thinking is probably that that would be too tight for the Wolfcamp B -- although I think industry and Diamondback probably need to test some increased interlateral spacing or tighter spacing before we make that -- a definitive statement. But right now our best thinking is probably that 10 across a section is probably not the right answer in the Wolfcamp B.
David Kistler - Analyst
Okay. Appreciate that. And then maybe as a follow-up to that, in the current commodity price environment, how do you guys think about doing delineation drilling; downspacing drilling; or, maybe even more specifically, additional science work over the next, call it, 12 months or so until either costs recalibrate appropriately or commodity prices look to improve?
Travis Stice - President, CEO, and Director
Certainly on the first point there, delineation drilling -- we've outlined a three-rig program for this year, and two of those rigs will be in Spanish Trail. So there's no delineation going there.
That third rig, Dave, would be bouncing around between Northeast Andrews, Martin County, and a few drilling obligations we have. So you can kind of think of that third rig as a delineation rig.
And then, specifically, the science -- I've always been a little bit reluctant to -- in a basin that's got over 400,000 wells drilled to spend a lot of money on science, instead preferring to spend our science dollars at the drill bit phase. That being said, though, I think there's some really exciting technologies on microseismic that can help us validate tighter spacing in our development scenarios. And certainly now is the time to consider doing that versus running a multi -- eight-rig program in our asset base that we'd like to have answered this year.
So that's probably the only science we are going to do is maybe a little bit of micro science testing here in the next quarter. And then we'll see what happens after that.
David Kistler - Analyst
Great. I appreciate that. And one last one -- with Tracy's comments about being free cash flow neutral in the second half of the year, and looking at sort of the production guidance you guys have given us -- in the event that you guys accelerate it, how quickly do you think you could start bringing production growth back in a meaningful fashion on a quarter-over-quarter basis?
Travis Stice - President, CEO, and Director
They are certainly -- Dave, they are certainly measured in quarters. So if we were to pick back up and start a full frac spread of completions starting in July, you probably wouldn't see that effect until mid-fourth quarter, by the time you start getting everything online and producing.
So to the extent we continue to defer completions, we will probably be at the lower end of our production guidance. To the extent that we kind of pick up midyear -- if there is a recalibration, appropriately, on service costs -- that would probably push us more towards the upper end of our range. But there's still a lot that has to play out on commodity price and service costs before we are going to increase activity.
David Kistler - Analyst
Great. Really appreciate the added color there, Travis, and also your commitment to capital discipline. You kind of set the standard for others. Appreciate that.
Operator
Michael Rowe, Tudor, Pickering, Holt & Co.
Michael Rowe - Analyst
I wanted to see maybe if you could provide -- or if you have enough information, really, at this point to quantify the impact of weather-related disruptions for Q1 that you all talked about in January?
Travis Stice - President, CEO, and Director
We've probably got roughly for the quarter maybe 1,000 barrels a day or so of impact. It was really a two-week event early on in January. And really, by the 10th day we were pretty much on track to get everything back on. I think it should be noise in the first quarter, but we will wait and see how the quarter ends up.
Michael Rowe - Analyst
Okay. That's helpful. And I just wanted to see if you could talk a little bit more about the cost reduction initiatives that you are working with on the LOE side. You kind of talked about -- on one of your slides, I think it was -- I can't find the slide number off the top of my head. But you talked about some things you are trying to do to bring down LOE.
So I just wanted to see if you could maybe quantify what are the bigger drivers there of costs, and what specifically you all can do from a competitive advantage standpoint versus your peers, aside from just having the mineral barrels flowing through your financial statements?
Travis Stice - President, CEO, and Director
Specifically, Michael, the well failure rate on these acquired properties was running around 1, which means each one of these wells were failing once a year. That's unacceptable for Diamondback standards. We need a well failure rate at 0.5 or below, which means these wells should fail once every two years.
We had a lot of well maintenance-related events due to poor pumping practices on these acquired properties that required us, quite honestly, to go in and look at everything from the pump placement -- the metallurgy of the rods and the tubing that were in the ground; as well as well we call telemetry, which is a real-time monitoring of how that pumping unit performs.
Most of these wells didn't have telemetry installed on them so that we could monitor performance. So we have gradually been upgrading these vertical wells -- at the same time instituting new field-wide well failure reports, so that we can understand why these wells are failing and then how to remediate it.
And I guess rather than spend more time explaining that, if you go back in our history, you can see the reason I put that slide in there. This is the same dance that we were involved in, you know, trying to get the historical or the legacy vertical wells at Diamondback Energy pumping in the best-in-class fashion. So I've got a pretty good track record, and I've got a very capable organization that's well-skilled in making these adjustments happen.
So those are things we can absolutely control. And then the other one is, quite honestly, we are seeing on the LOE side those people that support the expenses have been pretty quick to respond in reducing costs, as well.
So it's a combination of really three things: it's a combination of proactive pumping practices that we employ. It's a combination of increasing volumes and a combination of lowering service costs in these major LOE spend areas.
Michael Rowe - Analyst
Okay. That's great. And maybe just one last one, if I could squeeze it in here, would just be: you've got some really phenomenal rates of return in the Lower Spraberry, particularly when you factor in the mineral uplift. So just wanted to see if there was -- at any point where you would consider hedging maybe a little bit of volumes in 2016 to protect the strong economics there and potentially maintain operational momentum heading into next year, should commodity prices stay where they are, or even kind of fall back a little bit? Thank you.
Travis Stice - President, CEO, and Director
Yes, you bet, Michael. And yes, we would certainly consider hedging 2016 production. Curve's in contango right now, and we just need to -- you know, we are studying it real closely. So that's a fair question. And probably realistic expectations -- if we can get the right prices in 2016, we should look to mirror kind of what we've done in 2014, which is around 40% to 70% of our current production hedged.
Operator
Tim Rezvan, Sterne, Agee.
Tim Rezvan - Analyst
I had a quick question on Spraberry inventory. On slide 16 you give that 348 net location -- I know we spoke yesterday; you mentioned 225 in Midland County on 660-foot spacing. So are you saying -- I just want to clarify -- that roughly two-thirds of this inventory you list here is in that Midland County area?
Travis Stice - President, CEO, and Director
Yes. That 225 number is not just Midland County. That's Midland; Southwest Martin; Northwest Martin; and kind of the southern half of our Northeast Andrews County acreage, where we've drilled that Tawny well and Mason well with real good results.
So if you look at it for that area, if you assume 660-foot spacing, then we've got 220 Lower Spraberry locations remaining. If we can do it on 500-foot spacing or 10 laterals per section, then we're up at 277 locations remaining. Those counts are net wells at 7,500-foot equivalent lateral lengths.
Tim Rezvan - Analyst
Okay.
Travis Stice - President, CEO, and Director
So the 220 number is not just Midland County. It's kind of that Midland/Martin/Andrews area that we think we have proved up with our results.
Tim Rezvan - Analyst
Okay. So that delta -- that 120 -- is really kind of where you have less well control?
Travis Stice - President, CEO, and Director
Yes.
Tim Rezvan - Analyst
Okay. I appreciate that update. And then, lastly -- I know I am probably not going to get a good answer here -- but you talked about being on the lookout for accretive acquisitions. I was wondering if you could give any kind of color on what the state of the M&A market is? Just from -- I'm sure that you see all deal flow on your desk. If you could explain what you define as an accretive acquisition -- whether that's just kind of on a NAV basis, or what the metrics you are looking for? Thanks.
Travis Stice - President, CEO, and Director
You bet. Thanks, Tim. Certainly we are seeing a lot of M&A activity out here in the Permian Basin. I don't know if the full effect of low commodity prices and distressed assets has been felt yet. Probably more of a midyear or late 2Q event.
But one thing I do know, Tim, is that the position that Diamondback has placed themselves in -- not only with our execution prowess, but also our pristine balance sheet -- any M&A activity that is ongoing in the Permian, I think my shareholders should expect Diamondback to be right in the middle of that, if not the first call that is being made.
So I know you said you probably weren't going to get a good answer, and that's probably not a good answer, but that's kind of how we think about it. Accretive -- you know, EBITDA per share is usually a good one that we kind of look at. But then there's multiple appreciation metrics as well -- reserves, production, acreage, etc., as well.
Tim Rezvan - Analyst
Okay. Thank you.
Operator
Adam Michael, Miller Tabak.
Adam Michael - Analyst
My question is centered around the PUD reserves that were booked. I noticed in the presentation that you have 64 locations booked as PUDs, and I think your guidance was for 50 to 60 wells this year, and that's with reduced rig count.
It just seems a little conservative, and I wanted to maybe just see if we could get a little more color on kind of the thought behind the PUD bookings. It certainly seems like you could have booked twice as many PUDs with the drilling inventory that you had in the five-year rule, even with the reduced rig count. So maybe just a little more color there, please?
Travis Stice - President, CEO, and Director
Yes. You know, that 64 locations -- that's a net number. It's 79 gross horizontal wells that we booked as PUDs. 53 of those are in the Wolfcamp B. 20 are in the Lower Spraberry. So we had a lot -- several of our Lower Spraberry wells that we talked about came on either real late in 2014 or actually early in 2015. And so we didn't have any PUDs booked to offset to those wells.
And, you know, we've generally been conservative along with Ryder Scott on our PUD booking. We generally only book PUDs one location away. So if you look at it right now, we've got 15 Lower Spraberry wells on production and only 20 Lower Spraberry PUDs. So it is a fairly conservative number, but we've generally been conservative in the way we have booked our PUDs over time.
So as you mentioned, it's probably not really a reflection of our inventory. We've also got a lot of good inventory in the Lower Spraberry and also remaining in the Wolfcamp B as well.
Adam Michael - Analyst
It's refreshing to see, especially in light of some of your peers and how they have approached PUDs. But that's it for me. Thanks, guys.
Operator
Jason Wangler, Wunderlich Securities.
Jason Wangler - Analyst
Just curious, Travis, as you look -- and, obviously, the three rigs you are going to be running here after February -- as things improve, or obviously, given the returns you are making, if you were to look at another rig at some point, is there a thought to continuing Spanish Springs? Is there a thought to go to other areas, or maybe even the other formations? Would you continue on with the Lower Spraberry, or would you maybe either move back to the B or perhaps even to something else? Just kind of curious -- the thoughts there?
Travis Stice - President, CEO, and Director
Certainly, Jason. For us to increase activities is going to require continued service costs and some stability in the oil price, probably in the $65 to $75 range. If we were to pick another rig up, we would likely move that into our recently acquired acreage over in Glasscock County and Midland County, where we know we've got some really, really nice results both in the Spraberry and in the Wolfcamp B.
So that's probably where that rig would go. And we'll just leave the two rigs in Spanish Trails working, and one rig doing some delineation work, accordingly.
Jason Wangler - Analyst
That's helpful. And then you kind of mentioned about the LOE and the things you can do as far as driving the costs down -- and, obviously, guidance you put out for 2015 -- just as far as the cadence, looking at that throughout the year, is that going to be a pretty gradual reduction as you kind of work through that, for lack of a better word, backlog of wells that need to be worked on that you acquired? Just how you see that playing out.
Travis Stice - President, CEO, and Director
Yes, exactly. You know, I wish I could snap my fingers and make it happen overnight, but there's just a lot of hard work that has to go into fixing these legacy issues. So I expect sort of a quarter-over-quarter decline that's going to get us in that $6.50 to $7.50 range by the end of the year.
Jason Wangler - Analyst
Great. I'll turn it back. Thank you.
Operator
Mike Kelly, Global Hunter Securities.
Mike Kelly - Analyst
Travis, your F&D costs -- and they certainly speak to FANG's superior capital efficiency relative to the industry and your other Permian peers -- my question is: I'm just curious at how you see or where you see probably the biggest opportunities going forward to continue to push your operational efficiencies that really could continue this downward trend in F&D costs? Thanks.
Travis Stice - President, CEO, and Director
Yes, certainly. I look on two of the major spend areas on drilling these wells, which is the drilling side and the completion side. Right now, of the total dollars, it's about 40% allocated to the drilling side and about 60% on the completion side.
On the completion side, of that 60%, about half of that is related to pressure pumping. And so as we continue to see reductions in pressure pumping costs, that's going to translate to lower costs as well, too.
And then on the drilling side, we continue to optimize our efficiency -- both in terms of how fast we get to TD, and then also with the other ancillary costs that are associated with drilling these wells. So it's really not a single, actually, one or two item that I could point to that's going to push our costs lower.
It's really all the stuff the completion guys do on their side of the equation, delivering completed well costs in a best-in-class fashion; as well as the drilling guys, drilling these wells faster and faster. So it's kind of an efficiency thing. So it's really a combination of 1,000 decisions we make on a daily basis, not just one or two decisions on a quarter basis.
Mike Kelly - Analyst
Understood. And then if we look at recoveries, 2015's program is going to be core to drill, and arguably your best stuff is Spanish Trail's. What is kind of a ballpark way we should think about the average well EUR uptick in 2015 versus 2014's program?
Travis Stice - President, CEO, and Director
Probably you are looking at, I think, maybe 10% or 15% uptick. I think we've said probably two-thirds of our wells will target the Lower Spraberry. Roughly 25% in the Wolfcamp B.
And then we'll probably have a couple of tests in some other zones, including the Middle Spraberry and the Wolfcamp A as we do some stack tests. So a little bit more -- weighted more to the Spraberry this year than last year. And as long as we continue to see the results we have seen so far in the Lower Spraberry, I think that 10% to 15% uptick is probably a pretty reasonable number.
Mike Kelly - Analyst
Great. Appreciate it. Thank you.
Operator
Jeb Bachmann, Howard Weil.
Jeb Bachmann - Analyst
Travis, just a quick question: looking at the vertical PUDs booked, I saw you took down about 6.2 million barrels at year-end 2014. Just wondering if the ones you still have on the books -- are those some younger vintage? Is that why they are still there, or there's any other reason?
Travis Stice - President, CEO, and Director
Yes, they are a younger vintage. And they are also in areas where we've seen better EURs from our vertical wells. So some of the ones that -- you know, part of that 73 were ones that we weren't going to get drilled within the five years. But we also took some off that were kind of in our lower EUR areas that would probably have to come off at the end of 2015, assuming that commodity prices stay low.
Jeb Bachmann - Analyst
And just a follow-on -- with the location count on the vertical side. At what point do you guys start taking down some of those, if we are in a one- or two-year kind of prolonged -- maybe even longer -- commodity price weakness?
Travis Stice - President, CEO, and Director
Yes. I mean, we will just have to see how the commodity price plays out. Some of those locations are in -- or probably about half of those locations are in Spanish Trail, where we own the minerals; so it has considerably better economics than a typical vertical well. So, obviously, our horizontal wells are delivering better returns. And that's where the focus will remain. But we will just see how it plays out by the end of the year.
Jeb Bachmann - Analyst
All right. Thanks for the answer, guys.
Operator
Richard Tullis, Capital One Securities.
Richard Tullis - Analyst
A couple of quick questions related to M&A, continuing with that theme, Travis. You know, as you look at the landscape right now, given everything -- the commodity prices, your efficiencies -- are you willing to look outside the Midland Basin if you see an appropriate, attractive opportunity? Say it were in the Delaware Basin or even outside the Permian at this point, Travis?
Travis Stice - President, CEO, and Director
Richard, what I tell my guys: there's really no bad deals; there's just bad pricing. So from the Viper perspective, we've been looking outside the Permian for Viper -- and not so much Diamondback. But the logical progression for Diamondback would probably be in the Delaware Basin.
It's pretty exciting in one regard, and it's also pretty confusing in terms of what really is going to transpire in this M&A environment because of all the new private equity money that's been raised that's looking for a home in the Permian Basin. Some folks are thinking this may be the best chance to get into the Permian. So, again, like I was talking to Tim earlier -- I don't know exactly how it's all going to play out. But I do know with a fortress balance sheet and our execution record that we ought to be in all those conversations.
Richard Tullis - Analyst
Okay. And then just going back to Viper, Travis, how are things progressing? Looking to add mineral interests there -- is the bid/ask spread still fairly wide? Or are you seeing attractive opportunities?
Travis Stice - President, CEO, and Director
Yes, I would say that the bid/ask spread is still pretty wide for cash types of transactions, because the commodity price is down 55% or 60% since we IPO'd the Viper Energy Partners. But one thing that we are starting to get a little bit of traction with is the acknowledgment that receiving Viper units for minerals is starting to have some appeal at these prices. So we are engaged, and we are looking hard. And we will report when we close something.
Richard Tullis - Analyst
All right. Well, that's it for me. Thanks very much.
Operator
Michael Hall, Heikkinen Energy Advisors.
Michael Hall - Analyst
Thanks. Congrats on a good update. A lot of mine have, I guess, been addressed, but just kind of follow up on some of the existing questions -- just to make sure I am understanding it right, as it relates to the weighting on completion backlog: you said you'd kind of build up around a dozen wells waiting on completion.
Does the current guidance assume those are drawn down? Or is it maybe fair to say that the low end assumes that those remain in backlog as you make your way through the full course of the year, and the higher end of guidance then -- seems those get put on in second half?
Travis Stice - President, CEO, and Director
Yes, Michael. I think I was -- I tried to -- maybe I didn't do it efficiently, but I tried to address that earlier. To the extent we maintain a backlog of completions through the middle of the year, we will probably be more towards the lower end of our production guidance range.
To the extent that we reinitiate the pressure pumping side of the equation and get another crew in, we will probably push it more towards the higher and. The other thing is that we continue to be surprised, as we outlined in numerous points in our prepared remarks this morning, by this Lower Spraberry. And we tried to account for that in our production guidance.
These wells are certainly surprising us to the upside, and that doesn't usually happen in our business. So to the extent we bring more and more Lower Spraberry wells on and surprise us positively, that will also help push us towards the upper end of our production guidance.
Michael Hall - Analyst
Great. And I guess as we think about that Lower Spraberry, one other question I had was just around -- on the downspacing side. Is the Spraberry consistent enough throughout all the various portions of the portfolio that that downspacing assumption is fair to take across the board, do you think?
Travis Stice - President, CEO, and Director
I think it's a little early right now, Michael, to say all the way across our portfolio; because if you look in there -- I have got a slide in the slide deck that shows we've now get economic tests from Dawson County all the way down to Upton County, and that's about 120 miles.
So I think it would be a little bold at this point to step out and say everywhere you can downspace. But I'll tell you, if you just look at unconventional resource plays around the United States, typically over time they get spaced tighter and tighter. Whatever they start off with is usually not where they end up with.
And, of course, you've got to balance that with the risk of overcapitalization. So that's why I think it's prudent for Diamondback to continue to test this downspacing in a way that allows us as much optionality in the future to continue developing in a full-scale fashion at the right spacing intervals.
Michael Hall - Analyst
That's helpful. And what was it about the Wolfcamp B that you said that maybe you all weren't quite as optimistic about the opportunity to downspace there to 500-foot interlateral spacing? What is it about that reservoir that is kind of pointing you in that direction -- just curious?
Travis Stice - President, CEO, and Director
You know, of course, this varies across different people's acreage. But when you look at our acreage, we think there's a reasonable frac barrier between the Wolfcamp A and B. And so you are probably generating more fracture half-length and less height than the B.
If you look at the Lower Spraberry, which overall is quite a bit thicker than the B, but you really don't have any barriers to height growth. So you are generating as much height as half-length. And that's the reason -- really two reasons we think we can go to tighter spacing on the Spraberry, and that is: we are probably not generating as much effective length, and you've got a lot more oil in place in the Spraberry, as well.
Michael Hall - Analyst
That's helpful color. Thanks. And the last of mine -- on the somewhat recently acquired acreage in Glasscock and Western Midland, is there any leasehold expiration considerations that need to be taken into account even if I keep in mind, you know, that if prices remain low for long, that might force some activity over there?
Travis Stice - President, CEO, and Director
Yes, Michael, we've got a good handle on all of that. And the guidance we have given for this year incorporates maintaining leases -- not only into Glasscock County but across our acreage position.
Michael Hall - Analyst
Fair enough. Thanks. Appreciate it, then.
Operator
Gail Nicholson, KLR Group.
Gail Nicholson - Analyst
I'm looking at that Dawson County -- that Lower Spraberry test was a really solid well. Has there been any difference in that well behavior versus your Midland-area Lower Spraberry wells?
Travis Stice - President, CEO, and Director
Yes. I mean, you know, it's a nice result. It's obviously not as good as what we've seen in Midland County, or even Northwest Martin. Northeast Andrews -- you can kind of see that from the 30-day rates. But still a nice well. Has decent economics. At $50 oil, it's probably in that 15%, 20% rate of return. So, really, we probably need higher oil prices in the $65 to $70 a barrel before we go up there and drill a bunch of offset wells to it. But still a nice result overall.
Gail Nicholson - Analyst
In that Lower Spraberry location count that you guys provided in the horizontal count, how many are allocated to Dawson?
Travis Stice - President, CEO, and Director
I think right now we've got -- I think there's 24 wells that we have in Dawson. Obviously, if it works -- I mean, there's more potential locations than that. But we risked that number down for Dawson until we get some more results.
Gail Nicholson - Analyst
Okay. Great. And then looking on page 13 of the presentation and looking at the Lower Spraberry well results that you have there, have there been any different method of completion techniques within those Midland County Lower Spraberrys, or have you been completing them the same way? I know lateral lengths have varied, but I wasn't sure if you were putting more proppant or doing spacing with the frac stages -- anything different on those?
Travis Stice - President, CEO, and Director
No, it's been pretty much the same recipe. We've done some testing with 30/50 -- a little bit larger sand in the Spraberry. But in a general sense, we've maintained that 240-foot interstage spacing and 300,000 or so pounds of total sand per stage. That's kind of been our go-to.
You've heard us talk a little bit about shortening that interstage distance maybe down to 150 feet or so. And we continue to experiment with that. And still way too early to talk about whether or not we've got positive results.
But we continue to try to tweak on these stimulation designs, because -- never satisfied that we've got the right answer. In fact, our history says that these things evolve over time. So we want to make sure we are pushing that evolution.
Gail Nicholson - Analyst
Thank you.
Operator
Abhi Sinha, Wunderlich Securities.
Abhi Sinha - Analyst
I just want a quick update on Viper's inventory. So has your estimate of 127 wells -- that's what I thought for Lower Spraberry -- changed? And what about the total number of horizontal drilling locations? That was like 1,060 last time when we got an update.
Travis Stice - President, CEO, and Director
I'm not sure I caught all of that. Are you talking about the number of locations in Viper's inventory?
Abhi Sinha - Analyst
Yes, sir. So it was 127 wells in the Lower Spraberry for Viper's inventory?
Travis Stice - President, CEO, and Director
That's still based on the 660-foot spacing. We haven't increased that number yet for further downspacing.
Abhi Sinha - Analyst
Sure. And I believe the total horizontal drilling locations also remained the same -- like at 1,060, where it was before?
Travis Stice - President, CEO, and Director
That's correct.
Abhi Sinha - Analyst
Sure. And any word that you guys -- on basically what's your plan could be in 2016? Last time it was, like, you were expecting four horizontal rigs in Viper's take rates -- everything including RSP Permian, I guess. So do you think that would still -- might be the case?
Travis Stice - President, CEO, and Director
Yes. Obviously we have not provided a lot of -- you know, any color on 2016. But that's probably a reasonable assumption.
Abhi Sinha - Analyst
Sure. And lastly, I just wanted to see -- has your hedging strategy changed a bit, given the downturn that we have seen? And when commodity picks up, do you think you might be willing to add hedges to Viper's volumes as well?
Travis Stice - President, CEO, and Director
No, we won't hedge Viper. We've been pretty clear that we believe the most efficient form of transfer to our unitholders is to remain unhedged. We are constructive at the Viper level on the price of oil long-term, and we are going to stay unhedged at the Viper level.
There's really nothing to provide hedge insurance against. I don't have any maintenance capital. I don't have any IDRs or anything that I would need to preserve. I just want to pass, in the most efficient possible manner that I can, revenue from mineral production back to my unitholders.
Abhi Sinha - Analyst
Sure. That's all I have. Thank you very much, sir.
Operator
(Operator Instructions) Ryan Oatman, SunTrust.
Ryan Oatman - Analyst
At the risk of beating a dead horse, I would like to touch a little bit on the spacing a little bit more. I see slide 15 kind of going through the stacked pay potential in Spanish Trail. I was wondering if you could provide any insight as to whether the spacing varies by area, or whether minimal ownership helps you there? Whether, say, in Upton County you would see the spacing similarly or different? And if so, how?
Travis Stice - President, CEO, and Director
You are right. The mineral ownership obviously helps on the spacing. But really, when we look at the spacing, we've got to look at all aspects: you know, how much oil in place; and thickness per zone; and what kind of half-length we think we are getting. So specifically to Upton County, generally in most of the zones where we are at in Upton, the pay is a little thinner in both the Wolfcamp B and in the Lower Spraberry.
We've drilled a lot of Wolfcamp B wells down in Upton County; we actually did that on 880-foot spacing, just because the B was thinner there, and we thought we had a fairly good frac area. As we look back on it, we really haven't seen any interference down in Upton County in the B.
So maybe we should have developed that a little tighter than we did. So as we've got one Lower Spraberry well in Upton; we just completed two more that we will have some results in a few months. Now, we drilled those at 660-foot spacing. So we'll test a little tighter spacing down in Upton in the Lower Spraberry than we did in the B. And we'll just see how the results work out.
You know, as we look at the Lower Spraberry across -- in the rest of our acreage, it's fairly similar thickness up in the north area, up in Andrews, and Martin, and in Glasscock County as well. So we'll test tighter spacing there early on in those areas to guide us on what our ultimate development will be. But we think in those areas it ought to be pretty similar to what we are doing in Midland County.
Ryan Oatman - Analyst
That's very helpful. And then just to clean up one for me, can you refresh me on your oil pricing exposure? Roughly, how much is Brent versus LLS versus Cushing versus Midland?
Travis Stice - President, CEO, and Director
Are you talking about our hedge, Ryan? Our hedged volumes, or how much production we have?
Ryan Oatman - Analyst
No, I understand on the hedges.
Travis Stice - President, CEO, and Director
Okay.
Ryan Oatman - Analyst
And I can kind of see that you guys hedge at different pricing points. I guess I'm just trying to think about the physical marking -- kind of your ex-hedged volumes -- where all that's going, and what sort of pricing you are getting there, conceptually?
Travis Stice - President, CEO, and Director
We've got 8,000 barrels a day that go to Magellan Longhorn down to Houston Ship Channel. And that receives LLS pricing. All the remaining barrels we produce at this point go to Cushing, Oklahoma.
Ryan Oatman - Analyst
That's it for me. Thank you.
Operator
Thank you. At this time I am showing there are no further participants in the queue. I would like to turn the call over to Travis Stice, CEO, for any closing remarks.
Travis Stice - President, CEO, and Director
Thanks again to everyone for participating in today's call. If you have any questions, please reach out to us using the contact information provided.
Operator
Ladies and gentlemen, thank you for your participation on today's conference. This concludes the program. You may now disconnect. Everyone have a great day.