Company are in the Spraberry, Jo Mill, Wolfcamp and San Andres formations at depths ranging from 5,500 to 12,500 feet. Average net daily production in 2018 was 4,248 Boe. At December 31, 2018, we had 8,401 MBoe of proved reserves in the West Texas area, or 66% of our total proved reserves. We maintain an acreage position of approximately 19,830 gross (12,580 net) acres in the Permian Basin in West Texas, primarily in Reagan, Upton, Martin and Midland counties and believe this acreage has significant resource potential for horizontal drilling in the Spraberry, Jo Mill, and Wolfcamp intervals. We operate a field service group in this region utilizing nine workover rigs, five hot oiler trucks, one kill truck and one roustabout truck. Services including well service support, site preparation and construction services for drilling and workover operations are provided to third-party operators as well as utilized in our own operated wells and locations. In the first quarter of 2019, in our West Texas horizontal drilling program, the Company participated for 49.3% interest in eightone-mile horizontal wells drilled in the Middle Wolfcamp. These wells were brought on production in February, 2019. The total cost of these eight wells and their facilities is approximately $50.6 million, with the Company’s share being $24.9 million. Since completion these wells will have produced approximately 600,000 barrels of oil, along with associated gas. PrimeEnergy’s net revenue interest is 36.82%, therefore, our share of the oil recovered in just the first six months is approximately 212,500 barrels. We are pleased with the economic performance of these eight wells and expect 100% capital recover in less than two years.
In the second quarter of 2019, in our West Texas horizontal drilling program, we completed three new horizontal wells in intervals above the Middle Wolfcamp that previously were not proven as horizontal target reservoirs for our acreage. In the first 60 days of production the three wells have produced 125,000 gross barrels of oil along with associated wellhead gas: 50,000 barrels from the Lower Spraberry, 46,000 barrels from the Jo Mill, and 31,000 barrels from the Upper Wolfcamp. PrimeEnergy has 49% working interest and 40.7% net revenue interest in the Lower Spraberry well, 47% working interest and 39% net revenue interest in the Jo Mill well and 5.3% working interest and 3.9% net revenue interest in the Upper Wolfcamp well. Our share of the gross $26 million cost of these three wells is approximately $8.9 million.
These three new horizontal wells in Upton County are important tests of the economic viability of the shallower target zones, both for the 1,300 acre block in which they were drilled, as well as for our nearby 2,600 leasehold AMI (Area of Mutual Interest) acreage with Apache that holds similar potential. The successful outcome hasproven-up 21 additional locations in the 1,300 acre block, making these locations more likely to be drilled in the near future. The gross cost of an additional 21 wells would be approximately $182 million, with the Company’s share being $60 million. In the nearby Apache AMI, Prime holds several leases with interest varying from 14% to 56%. The strong performance of these new horizontals is likely to spur the drilling of as many as 96 additional horizontal wells in the Apache AMI over the coming years. The gross cost of 96 wells here would be approximately $748 million with the Company’s share being approximately $284 million. The actual number of wells that will be drilled, the cost, and the timing of drilling will vary based upon many factors, including commodity market conditions.
In the Permian Basin of West Texas the Company maintains an acreage position of approximately 19,830 gross (12,580 net) acres primarily in Reagan, Upton, Martin and Midland counties. We believe this acreage has significant resource potential in approximately 10 reservoir benches, including benches of the Spraberry, Jo Mill, and Wolfcamp formations to support the potential for drilling as many as 375 additional horizontal wells.
Mid-Continent Region
OurMid-Continent activities are concentrated in central Oklahoma. This region is managed from our office in Oklahoma City, Oklahoma. As of December 31, 2018, we had 580 wells (227 net) in theMid-Continent area, of which 310 wells are operated by us. Principal producing intervals are in the Roberson, Avant, Skinner, Sycamore, Bromide, McLish, Hunton, Mississippian, Oswego, Red Fork, and Chester formations at depths ranging from 1,100 to 10,500 feet. Average net daily production in 2018 was 977 Boe. At December 31, 2018, we had 2,882 MBoe of proved reserves in theMid-Continent area, or 23% of our total proved reserves. We maintain an acreage position of approximately 81,800 gross (10,900 net) acres in this region, primarily in Canadian, Kingfisher, Grant and Garvin counties. We operate a field service group in this region from a field office in Elmore City, utilizing one workover rig and one saltwater hauling truck. OurMid-Continent region is actively participating with third-party operators in the horizontal development of lands that include Company owned interest in several counties in the STACK and SCOOP shale plays of Oklahoma where drilling is primarily targeting reservoirs of the Mississippian, Woodford, and Hunton formations.
In theMid-Continent Region, in 2018, the Company participated in 11 wells in Oklahoma, with six of these on production byyear-end. Another five of the 11 wells were drilled by Marathon in the “Ruthie 1609” tract in Kingsfisher County and broughton-line in March of 2019. Prime participated with 11.87% interest in these five new wells, investing approximately $4.9 million. This group of wells is showing strong initial production performance. This activity has now been closely followed by the
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