Sebastien Morin
Analyst · Anne Milne with Bank of America
Thanks, Ryan. Good morning, everyone. As Ryan mentioned, capital expenditures of $55 million were higher than the prior quarter of $39 million and down [ 71 ] -- down from $71 million compared to the first quarter of 2023. During the quarter, we completed our Acordionero drilling program in the majority of our Costayaco program, achieving approximately a 16% reduction in drilling costs, a savings of approximately $3.8 million between both programs.
Total average working interest production during the quarter was 32,242 barrels of oil per day, an increase of 3% over the prior quarter despite deferred production of approximately 1,000 barrels of oil per day as a result of social disruptions at the Acordionero field. Post disruption, the field was rapidly ramped back up without issue and is now back producing over 17,000 barrels of oil per day per expectations.
In particular, we are very pleased about the successful drilling program in Costayaco that confirmed the company's reservoir interpretation and extended the field significantly to the north and to the south. The 4 wells drilled in the north had a combined initial 30-day production rate of 5,707 barrels of oil per day, unstimulated and on jet pump. Currently, work has commenced to install the final selected completions, [ conduct zonal ] testing and stimulation as well as installation of the final optimized artificial lift, which we expect will increase production further.
To note, Costayaco was originally discovered in 2007. Our 2024 program has increased production to the highest level since 2017. We -- as highlighted in the press release, we initiated our high-impact exploration program with the Arawana-1 well, which was spud on the Chanangue block in early April.
We are very excited about the initial open hole logging results of the well, which is drilling to a bottom hole location, 1.5 kilometers away across the fault from the Bocachico-1 well. Bocachico-1 had an initial 90-day production rate in the Basal Tena of greater than 1,100 barrels of oil per day and continues to produce at approximately 850 barrels of oil per day, 20-degree API oil at less than 1% water cut and has recovered over 330,000 of barrel of oil since June 2023.
The Basal Tena is the geologic equivalent to the N-Sand and Cohembi located 20 kilometers to the north. Our map area of closure and rock properties observed in Arawana-1 compares well to the Cohembi field. At the end of 2023, the Cohembi field has produced 28 million barrels of oil and has remaining reserves of 25 million 1P, 54 million 2P and 95 million 3P.
Given these observations, we are very excited to finalize drilling operations at Arawana-1, run casing and start testing in the next few weeks. Looking to financial metrics, Gran Tierra's operating expenses increased by 2% to $48 million compared to the prior quarter, primarily due to higher workovers, offset by lower lifting costs primarily related to power generation optimizations in Costayaco, Acordionero and Cohembi fields.
The company's transportation expenses increased by 16% to $4.6 million when compared to the prior quarter. During the quarter, Gran Tierra utilized longer distance delivery points due to low river levels in Colombia caused by dry El Nino conditions resulting in higher transportation costs. Today, we are excited to also announce the release of our 2023 sustainability report. I will go through some key highlights below. However, I invite you to visit our website and go through the report in its entirety.
2023 was the safest year in company history with over 17 million work hours without any incidents causing lost time since June 9, 2022. Gran Tierra's reforestation efforts, the company has planted over 1.6 million trees and has preserved or reforested approximately 4,500 hectares of land since 2018. This is equivalent to sequestering 20 years of our current greenhouse gas emissions.
Gran Tierra is reducing greenhouse gas emissions at its facilities through gas to power projects that can serve excess natural gas that would otherwise be flared using the gas instead to power generation. In 2023, Gran Tierra's gas power projects generated approximately 70% of the total energy used in all of the company's operations. Gran Tierra has started 2024 on a strong footing, and we look forward to continuing to ramp production through our ongoing waterflood optimization initiatives, new well completions and exciting near-field exploration program. I'll now turn the call back to the operator, and we will be happy to answer any questions. Operator, please go ahead.