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Operator
Good morning, ladies and gentlemen, and welcome to Gran Tierra Energy's Conference Call for Fourth Quarter and Year-end 2022 results. My name is Andrea, and I will be your coordinator for today.
(Operator Instructions) I would like to remind everyone that this conference call is being webcast and recorded today, Wednesday, February 22, 2023, at 11:00 a.m. Eastern Time. Today's discussion may include certain forward-looking information, oil and gas information and non-GAAP financial measures. Please refer to the earnings and operational update press release we issued yesterday for important advisories and disclaimers with regard to this information and for reconciliations of any non-GAAP measures discussed on today's call.
Finally, this earnings call is the property of Gran Tierra Energy, Inc. Any copying or rebroadcasting of this call is expressly forbidden without the written consent of Gran Tierra Energy. I would now like to turn the conference call over to Gary Guidry, President and Chief Executive Officer of Gran Tierra. Mr. Guidry, please go ahead.
Gary Stephen Guidry - President, CEO & Director
Thank you, Andrea. Good morning, and welcome to Gran Tierra's Fourth Quarter and Year-End 2022 Results Conference Call. My name is Gary Guidry, Gran Tierra's President and Chief Executive Officer. And with me today are Ryan Ellson, our Executive Vice President and Chief Financial Officer; and Rob Will, our Vice President of Asset Management. .
Yesterday we issued a press release that included detailed information on our fourth quarter and year-end 2022 results. In addition, Gran Tierra's 2022 annual report on Form 10-K has been filed on EDGAR and is available on our website. Ryan and Rob will make a few brief comments, and then we will open the line for questions.
Ryan, please go ahead.
Ryan Paul Ellson - Executive VP of Finance & CFO
Thanks, Gary. Good morning, everyone. We are very pleased to announce that Gran Tierra achieved several company financial records in 2022. Our excellent performance in 2022 was driven by our successful development and exploration drilling, water flooding programs, field performance and disciplined cost management, combined with strong oil prices. Our many achievements during the year resulted in year-over-year production growth of 16%, strong reserves replacement ratio well above 100%, and the highest annual figure in the company's history for net income, funds flow from operations and free cash flow.
After reduced exploration activity during 2020 and 2021, the company made several key exploration discoveries during 2022, which provide confidence in our geological (inaudible) basins. Through our successful results from development and exploration drilling, waterflooding programs and fuel performance, we're able to increase reserves in 1P, 2P and 3P categories, which Rob will describe.
During 2022, our net income was $139 million, the highest on record as a result in our earnings per share on both the basic and diluted basis coming in at $0.38 per share. Our adjusted EBITDA was $490 million and was $1.34 on a basic per share basis. Funds flow from operations were $366 million, resulting in free cash flow of $129 million, both of which were also records for the company. Funds flow from operations for the year was $1 on a basic per share basis.
Gran Tierra's on budget capital spend totaled $237 million for the year and was balanced between exploration and development activities, which resulted in reserves and profitable production growth year-on-year. In 2022, Gran Tierra continued its commitment to reduce debt resulting in a reduction of $88 million in debt and $173 million in net debt. The company finished the year with $127 million in cash and net debt to adjusted EBITDA of 0.9x. The company also achieved a return on average capital employed of 27% during 2022.
Gran Tierra's strong operating netback of $48.43 per barrel for the year, was up 43% from $33.75 in 2021. Before I hand it over to Rob, I want to mention some of our Beyond Compliance initiatives, where Gran Tierra identifies significant opportunities and benefits in environment communities. We voluntarily strive to go beyond what is legally required to protect the environment and provide social benefits because it's the right thing to do. We're very proud of the company's track record in all aspects of our environmental, social and governance stewardship.
In 2022, Gran Tierra in partnership with the World Women's Corporation, carried out an anti-personnel de-mining investigation across approximately 4,300 hectares of land situated within 4 indigenous communities in several municipalities in the Putumayo Basin of Colombia. As part of the company's commitment, the United Nations guiding principles for business and human rights, 95 human rights training sessions were held in Colombia and Ecuador in 2022, which include almost 500 employees, contractors and suppliers.
Gran Tierra strives to maximize local employment and development opportunities, which meet or exceed government requirements for local employment. Since 2015, Gran Tierra has created approximately 26,000 labor opportunities in Colombia. The company also created roughly 470 labor opportunities in Ecuador in 2022. Gran Tierra has also committed to work with the Colombian, Ecuadorian national and local governments and local communities to further their peace building efforts. In 2022, the company invested over $4.6 million locally in projects in Colombia and Ecuador identified by the communities themselves to meet their needs. The projects include the improvement of agriculture production capabilities, entrepreneurship support, community strengthening programs and infrastructure improvements to schools, homes and community centers.
These are just some of the initiatives we completed in 2022, and I highly recommend that you take a look at our 2022 Sustainability Report, which will be available on our website in the second quarter of this year.
I'll now turn the call over to Rob Will to discuss some of the highlights of our current operations.
Rob Will
Thanks, Ryan. Good morning, everyone. I'll briefly cover a few operational highlights from yesterday's press release, as well as our recent press release regarding 2022 year-end reserves.
Operationally, we are building off a successful year in 2022 to start off 2023. Down in the Putumayo Basin of Colombia and the Chaza Block we have commenced our Moqueta drilling campaign with the first well being drilled in late 2022, which was the first well drilled in the field since 2016. Moqueta-25, the second development well in the 2022-2023 Moqueta drilling campaign reached its planned total depth on January 15, 2023. This well has been completed and was put on production on February 1.
Producing on jet pump, the well has averaged 383 barrels of oil per day unstimulated. We plan to stimulate the well during Q2 of this year. The third Moqueta development well, Moqueta-26, was spud on February 9, 2023 and is expected to reach its planned total depth before the end of February. In addition to Moqueta 25 and 26, the company plans to drill and complete 1 to 2 more development wells in Moqueta over the next 4 to 5 months.
Also in the Chaza Block, the first well, the Costayaco 6-well 2023 development drilling program was spud on January 25, 2023 and reached its planned total depth on February 2. Reservoir quality was as expected in this planned down-dip water injection well. The second well was spud on February 7, 2023 and reached its planned total depth. All wells in the Costayaco drilling program are expected to be drilled by late second quarter 2023 and completed and put on production or injection before the end of third quarter 2023.
In the south of the Putumayo Basin, the Suroriente Block's production averaged approximately 8,620 barrels of oil per day growth in January 2023, marking the second highest monthly production average since the second quarter of 2015. This was achieved despite the fact that we've not drilled a well in Suroriente since the first quarter of 2018.
Up in the Middle Magdalena Valley Basin of Colombia, the first well, the Acordionero's 10 to 12 well 2023 development drilling program, Acordionero 111 was spud on January 27, 2023 and reached its planned total depth on January 30. Well logs indicate that the reservoir pay zone came in as expected. The company plans to complete this well and put on production before the end of February 2023. The second well, a planned injector was spud on February 5 and has reached its total depth. The third well was spud on February 12.
All the planned wells in this year's Acordionero development program are expected to have been drilled, completed and placed on production or injection by the end of second quarter 2023.
Finally, we also plan to continue to focus on the appraisal of new discoveries and new exploration drilling during 2023, all while generating free cash flow to strengthen our balance sheet and return capital to shareholders through potential share buybacks.
As for our 2022 year-end oil reserves, the company achieved significant growth in its 2022 year-end 1P NPV10 before tax, which increased by 26% compared to 2021 year-end. As well, we achieved significant growth in our 2022 year-end 2P NPV10 before tax, which increased by 25% compared to year-on-year. These increases were driven by the company's successful development and exploration programs and a strong recovery in oil prices.
After reduced exploration activity during 2020 and 2021, the company made several key exploration discoveries during 2022, which helped the company achieve excellent reserve replacement ratios. The ratios are as follows: 126% 1P, with 1P reserve additions of 14 million BOE; 148% 2P, with 2P reserve additions of 17 million BOE; 280% 3P, with 3P reserve additions of 31 million BOE. The material 1P reserve additions were largely driven by success with development drilling and water flooding results at Acordionero and Costayaco in addition to several exploration discoveries. Material 2P and 3P reserve additions were a large measure due to the success of the company's 2022 exploration program, which made several independent discoveries.
By continuing to focus on a combination of reductions in combination of reductions in depth and per well capital costs, maintaining low operating costs and completing share buybacks, Gran Tierra was able to achieve net asset values per share before tax of $4.62 for 1P, up 77% from 2021; and $7.36 for 2P, up 56% from 2021. With the significant growth in our net asset values per share in 2022, we believe Gran Tierra is well positioned to offer exceptional long-term stakeholder value.
We believe our success on multiple fronts during 2022 demonstrates Gran Tierra's ability to be a full cycle oil and gas exploration, development and production company, focused on value creation for all our stakeholders.
I will now turn the call back to the operator, and Gary, Ryan and I will be happy to take questions. Operator, please go ahead.
Operator
(Operator Instructions) Our first question comes from Adam Gill with Paradigm Capital.
Adam Gill - Research Analyst
Two questions for me. First off, on operating costs. We've seen escalation over 2022 given power costs rising and increased workover activity. That said, do you believe you've hit a plateau on OpEx? And what drivers could lower OpEx going forward?
Ryan Paul Ellson - Executive VP of Finance & CFO
Yes, I think we have hit a plateau. We think our operating costs on a gross basis will be similar in 2023 compared to 2022. Our production will be higher, so on a per unit basis we'll see those costs come down.
Adam Gill - Research Analyst
Okay. Great. And the second question was just on Suroriente and the contract expiring midyear 2024, is there any precedence on contract renewal? And what could the upfront commitments look like to ensure that this asset stays in the portfolio?
Gary Stephen Guidry - President, CEO & Director
Yes. There are multiple precedents in the country of contract renewal. We do have clauses in our contract for renewal, and we are in discussions with Ecopetrol on trying to achieve that before the expiry.
Adam Gill - Research Analyst
Any thoughts on timing of when that could be completed?
Gary Stephen Guidry - President, CEO & Director
No, no real -- just before expiry. We're working as diligently as we can and it's mutual with Ecopetrol because both companies see benefits of continuing the programs that we've started over the last couple of years.
Operator
Our next question comes from Oriana Covault with Balanz.
Oriana Covault;Balanz;Equity & Credit Research Analyst
This is Oriana Covault with Balanz. I had 3 questions, if it's okay to go one by one, that would be great. First, with regards to the Vasconia and Castilla pricing discounts, I noticed that they remained at big levels through the fourth quarter. So just wondering what are you observing so far during the year? And what is driving the wider discounts? And how are you including this in your 2022, or 2023 guidance?
Ryan Paul Ellson - Executive VP of Finance & CFO
Yes. Thanks, I'll take that. On the Vasconia and Castilla, they started to widen at the end of last year as pointed out, and it's continued into January. It is starting to tighten a little bit in February. And the main driver is really just a lack of heavy oil demand, especially with China.
And I think with China reopening, we started to see those differentials narrow. And it's right around what we have budgeted right now. We expect them to be wide in Q1, Q2 and then narrow into Q3 and Q4. And that's really what we forecasted.
Oriana Covault;Balanz;Equity & Credit Research Analyst
Got it. And following, I noticed in the introduction of a new risk factor in your 10-K regarding the adverse impact that certain acquisitions may have in the business. So just wondering if you could further elaborate on this? And more precisely, if you're looking into new jurisdictions aside from Ecuador, and what type of transactions would make sense for Gran Tierra?
Ryan Paul Ellson - Executive VP of Finance & CFO
Yes. I think that's just a risk factor. I think most E&P companies do have that within their disclosure. And I think for us, we're -- part of our job is always to optimize the portfolio. So we are very happy to either acquire new assets portfolio or sell assets that are in our portfolio. We're always looking to optimize. So it could be within Colombia or outside of Colombia, again, that will give either buyers or sellers.
Oriana Covault;Balanz;Equity & Credit Research Analyst
Perfect. And just one final one. We noted that ending cash position came a bit shy of the $190 million that you had guided with the third quarter report. So if you could share any additional color on this?
Ryan Paul Ellson - Executive VP of Finance & CFO
Yes, two drivers on that. One, Brent price came in quite a bit lower than we originally forecasted, but also the differentials. So those were much -- much wider than we had forecasted. It was both -- if you look at Vasconia, the historical average, 5-year average is about $3 and it widened all the way up to $10 at one point. And Castilla, the 5-year average is closer to $7 to $8 and it widened all the way up to $18, $19. So that really hurt us in the quarter. And the rest is really just explained from working capital movements.
Operator
Our next question comes from Josef Schachter with Schacter Energy Research.
Josef I. Schachter - Author & President
Good morning Gary, Ryan and Rob, congratulations on all the progress you made this year. A few questions. The first one will go with Ryan. Where do you see the target debt level that you'd like? You're down below 1:1 debt to EBITDA. If we see 85 to 90 per average for Brent in 2023, you'll generate $70 million to $100 million of free cash flow. Plus you have the $100 million or so, $126 million on the balance sheet, how do you see debt in terms of where you want it to be going forward?
Is there a target from the 589 that you have on the balance sheet on December 31, '22? Is there a number you want to have? And at that point, you say that's the amount of debt that should be in this going forward? Or do you want to keep on knocking debt down to zero and not have debt at all? Just trying to get in my head how much money will be left over after that to increase growth via exploration and development, or by more stock buybacks, et cetera?
Ryan Paul Ellson - Executive VP of Finance & CFO
Yes, it's a good question. I think we're comfortable with net debt-to-EBITDA of 1x. In the 0.8x to 1x is really our comfort range. I think when we look at our gross debt, right now we're about 580 is -- our target would be between 500 and 550. And we think that will be a right capital structure for the company of our size currently.
Josef I. Schachter - Author & President
Okay. Next question, in the releases in your government document on Page 9, you talked about the exploration blocks. And you put a single star, double star there. And you have, I think, it's 2, 4, 6, 8, 8 with 1 star, which says exploration is suspended due to licensing restrictions, security issues or social reasons.
Do you see any changes to that in '23? Or is this -- and do you get extensions from the government so that you can keep these properties for future use once things settle down there?
Gary Stephen Guidry - President, CEO & Director
Yes. I think the short answer to that is we're -- on a continuous basis, we're working with the government and with the communities. The ones that are suspended are issues with communities, and it's an ongoing process.
We've not given up really on any of our top priority exploration projects. But there are some that we may in the end relinquish. But I can assure you that it's none of our top priorities going forward. And so it's -- I think the short answer is everything that we want to do, we're doing, and we'll achieve that over the next 1 to 3 years.
Josef I. Schachter - Author & President
Okay. Lastly, Gary again, as a shareholder and as somebody who's been a fan of the company and the opportunity in Colombia and Ecuador, you see a lot of the stocks in Colombia have a discount to valuations.
And as you highlighted with your colleagues in the presentation about the discount NAV, and as Ryan mentioned, selling or buying is possible. Is the barrel cheaper on Bay Street and Wall Street than spending money? And is there interest in potentially selling some assets and then doing a substantial issuer bid and waking everybody up to the underlying value that is currently being ignored?
Gary Stephen Guidry - President, CEO & Director
Yes. Again, the short answer, I think, is on a continuous basis, we're looking at how we create value. Ryan mentioned the debt levels. If we have discoveries that we see long term will develop, we'll adjust accordingly in terms of our balance sheet.
We also are looking at other basins around the world. We've all seen the large companies starting to divest non-core assets, which we believe, in many cases a company of our size and our portfolio, we can create a lot of value regardless of the valuations on the stock price.
We look at it as we're in this business for the long term, long term being the next 5 years, not the next 5 weeks. And we will direct our efforts both on our current assets and new assets that we diversify into in other basins, other assets.
And I think you hit a good point. We also are looking at -- we'll look at opportunities to bring in other partners and things that we're doing to dilute our interest. But everything we have in our portfolio today we really like. And we really believe that we can create value, and we're just looking to expand that portfolio.
Josef I. Schachter - Author & President
Okay. I'll be rooting for more breakthroughs in 2023.
Operator
Our next question comes from Alexandra Symeonidi from William Blair.
Alexandra Symeonidi
Most of my questions have been answered. I just have one. If you have estimated total tax in 2023, given your guidance for production and your estimate for oil prices and the discounts. So tax that would include the surcharge and the (inaudible) of royalties. Have you made that calculation, that estimate?
Ryan Paul Ellson - Executive VP of Finance & CFO
Yes. Estimate tax based off of $85 Brent and again paid on differentials and what pricing used. But we'd expect our current tax to be $110 million to $130 million.
Alexandra Symeonidi
And this includes several royalties, or what you need to pay for the royalties? I mean the nondeductibility of royalties.
Ryan Paul Ellson - Executive VP of Finance & CFO
Yes, that our current tax bill for to 2023, which will be paid in 2 installments in 2024.
Operator
Our next question comes from Philip Skolnick with Eight Capital.
Philip Ross Skolnick - Principal & MD Research
Just going back to Suroriente. If you were to get the contract renewal, how do we think about the reserve adds with respect to that? And also, would there be any potential changes to this year's CapEx budget, maybe production target?
Gary Stephen Guidry - President, CEO & Director
Yes. I think the answer, Phil, is our plans for Suroriente would be to expand the waterflood. We've done a lot of work over the last few years. In terms of the capital program, there would be some minor adjustments. But the we would look more at a 3-year type plan to expand the waterflood, to increase some of the development drilling in the block.
So you wouldn't see a major change in the capital program this year. But over the next 3 years, we would focus a lot of effort on increasing reserves. We are taking a look at what would change in our reserve base going forward. But we don't want to be premature in waiting for the contract actually to be signed. And we're working mutually with Ecopetrol and trying to put that program together.
Philip Ross Skolnick - Principal & MD Research
Got it. Understood. Just finally, just I know in the past, recent past, you've said that the environmental permitting process, it's basically been business as usual. Is that still the case?
Gary Stephen Guidry - President, CEO & Director
It has. And we've been working very diligently with communities on blockades and other interruptions. And we've seen some progress, I think, is the way to say that.
But in terms of permitting and environmental studies, it's business as usual in Colombia and in Ecuador. We're quite excited about our discoveries in Ecuador. As Rob mentioned, we see some real opportunity there to expand what we're doing across the border in Ecuador as well.
Operator
Our next question comes from Luke Davis with RBC.
Luke Davis - Analyst
You guys have pilot wells coming on this year. Just wondering if you can speak a little bit to the expected cadence of production volumes maybe quarterly and where you expect to exit the year at? And also just wondering if you have any contribution expected from any of the exploration wells that are included in the program?
Ryan Paul Ellson - Executive VP of Finance & CFO
Thanks, Luke. Yes, I think the cadence -- as Rob mentioned, we're doing a lot of development drilling in the first half of the year. So those will be brought on in Q2 and into Q3. So we expect a steady ramp up for the year and extend the year around 34,000 barrels or so.
Luke Davis - Analyst
Got it. And anything from those exploration wells? Or is that just potential upside?
Ryan Paul Ellson - Executive VP of Finance & CFO
Potential upside.
Luke Davis - Analyst
Yes. Okay. The only other thing I was wondering about is just buybacks, how you're thinking about that? Is that going to be sort of a portion of free cash flow that you're sweeping into buybacks? Do you have an aggregate target that you're looking to hit? Or how are you thinking about that currently?
Ryan Paul Ellson - Executive VP of Finance & CFO
Yes. We bought back 6.2%, 6.3% of our stock last year, and we have approval currently up to around 10%. So especially when we traded at such a substantial discount to our NAV, we definitely like to max out the NCIB and then look to renew.
Operator
Our next question comes from Juan Cruz with Morgan Stanley.
Juan Cruz
I just wanted to clarify just quickly, you guys were talking about debt levels going forward. And on the third quarter call, you had indicated to the market that you have bought back about $20 million worth of the 2025 bonds.
It's my understanding that those are still outstanding. Just wanted to see if there's any reason for them not being canceled yet, considering your targets. If you can comment on that, that would be great.
Ryan Paul Ellson - Executive VP of Finance & CFO
Yes. We hold those bonds ourselves. And the only reason why we didn't cancel them is we want to make sure that there was no adverse impacts as far as index inclusion. So from accounting treatment and really the economic reality is we're holding those bonds, our debt is $580 million, and we used that to have the $300 million bonds assigned for index inclusion.
Juan Cruz
I understand. Okay. But from your perspective, there's no intention of reselling those bonds back into the market?
Ryan Paul Ellson - Executive VP of Finance & CFO
No. No. There is not.
Juan Cruz
They're in treasury and that would remain in treasury for index inclusion purposes?
Ryan Paul Ellson - Executive VP of Finance & CFO
Correct. They're already at liquid enough, so we don't want to do anything anymore to average.
Operator
Our next question comes from Roman Rossi with Canaccord Genuity.
Roman Rossi Lores - Analyst
Just a couple. The first one is regarding the buyback program. I just wanted to check what happened if you reached the limit of the program? Are you able to initiate a new one? And the second one is, last year, you mentioned you wanted to have a cash balance of around $100 million. I just wanted to check if that's the guidance change? Thanks.
Ryan Paul Ellson - Executive VP of Finance & CFO
Yes, we can renew the program once we fulfill -- once we buy up to the maximum, which we would look at renewing afterwards, which would be good for a year.
And then on the cash balance, we always target $75 million to $100 million in a cash balance. And that hasn't changed.
Operator
Our next question comes from Chris Dechiario with Marathon Asset Management.
Christopher Dechiario
Just wondering, I mean, what your current view is or outlook is on potential restrictions on exploration going forward? I know there's been a lot of talk from various people in Colombia. It's sort of hard to tell where it's going to end up. But I mean, how are you looking at that? And does that affect your plans? Is that affecting maybe your thoughts on acquiring assets outside of Colombia? Give your thoughts on that.
Gary Stephen Guidry - President, CEO & Director
Yes. We have a great portfolio of exploration lands, and we have plenty of work in front of us for the next 3 to 5 years. We also have some very exciting lands in Ecuador as well.
So in terms of exploration, we realize there have been some announcements in Colombia about no new exploration lands. We get that. But it's no impact on what we're doing in our 5-year plan as we go forward in Colombia.
I mentioned Ecuador. The answer to your question is, we are looking at some other basins. We have a very strict criteria in what we invest in globally. And we are looking at some opportunities in Africa, the Middle East, where we believe that we can not only expand our value portfolio but diversify and mitigate risk.
And so the answer to your question is we're very happy with our exploration in Colombia, but we're also looking at other opportunities in other basins.
Operator
Gentlemen, there are no further questions at this time. Please continue.
Gary Stephen Guidry - President, CEO & Director
Thank you. Thank you, Andrea. I would again like to thank everyone for joining us today. We look forward to speaking with you over the next quarter and update you on our ongoing progress. Thank you.