Jamie Vazquez
Analyst · Phil McPherson with Global Hunter Securities
Thank you, Tracy. We are working to achieve our growth objective with a balanced approach. We expect to achieve both reserve and production growth in 2012 from our exploration and production activities and through acquisitions. We continue to have great success with the drill bit. So far, in 2012, we have a success rate of 100% on the 18 completed wells located onshore of which 9 were exploration wells. Historically, W&T has made accretive acquisitions, which have played a major role in our strategy -- growth strategy. We focus on identifying properties in which we can make money, as well as where we can enhance the value of the assets using our many years of operating expertise.
Offshore Gulf of Mexico. We have 2 active rig operations in progress. Currently, we are operating with 100% working interest, a rig on the Mississippi Canyon 243, A-4 side track well located in our Matterhorn field, which is a deepwater development well. This well has reached a total depth of 6,781 feet total vertical depth and we are currently completing a well in an oil sand that is expected to add 3,500 barrels of oil equivalent per day net to our interest in mid-June. The estimated cost to drill and complete this well is $35 million net, which provides an IRR in excess of 100%.
Since acquiring the Matterhorn field in the spring of 2010, we have increased production by an impressive 54%.
Our second operated rig is conducting operations on the Ship Shoal 349 A-13 well located on the shelf in our Mahogany field. We just completed drilling A-13 development well to a total depth of 15,343 feet and we are currently completing the well in the P Sand, where we found a net 106 feet of oil pay. The A-13 well is expected to add 1,500 barrels of oil equivalent per day net, and net productions should come on at the end of May. The A-13 well is the third well of a potential 6-well drilling program that commenced in 2011 and will continue into 2013. Once we complete operations on the A-13 well, we plan to skid the rig and commence drilling of the A-5 side track in late May, which is a development well also targeting oil in the P Sand. This program is expected to yield an IRR of excess of 100%.
Mahogany is our largest offshore field and is owned 100% by W&T. Onshore, we have ongoing operations in 2 focus areas in Texas. One area of focus is in the Permian Basin, where we have approximately 32,000 net acres under lease and are actively exploring and developing our Yellow Rose and Terry County projects. The other area of focus is East Texas, where we have approximately 142,000 net acres under lease, which we refer to as our Star Project. In the Yellow Rose project, in West Texas, we have 22,900 net acres under lease located in Dawson, Martin, Andrews and Gaines County.
During the first quarter of 2012, operating 3 rigs, we completed 14 wells in Yellow Rose, 5 of which were exploratory and 9 were development wells. All 14 were vertical wells that each cost around $2 million net to drill and complete, targeting about 4,500 feet of vertical section in the Wolfberry. We anticipate that an average vertical well will yield at 26% IRR using 163,000 barrels of oil equivalent estimated ultimately covering Rose. The field is currently booked on 80-acre spacing. However, we expect to move to 40-acre spacing and possibly 20-acre spacing in the future. It is anticipated that we -- this will maintain -- we will maintain 3 rigs throughout 2012 and that the development drilling program will continue into 2015.
In June 2012, we plan to begin our pilot test horizontal program with the drilling of our first horizontal well in Yellow Rose, targeting the upper Wolfcamp with a 5,600-foot lateral with an initial estimated cost of $6.9 million to drill and complete. The Yellow Rose field has huge upside with the potential of both down spacing and the horizontal development.
Moving on to the Terry County project. During the first quarter, we completed 4 exploration wells. As you know, Terry County is in Wolfberry play. Since 2011, we have completed a total of 10 vertical wells drilling to about 12,000 feet at a cost of $2.3 million to drill and complete for each well. We are currently in our exploration and delineation phase in this area and the wells we drill today are at various stages in completion and flowback and we will continue to analyze this data that we receive from these wells. As a part of our delineation plan, we anticipate drilling at least 1 horizontal well in our Terry County project prior to announcing our future development plan. I would like to point out that we do not have any proved reserves booked related to this 9,500-acre area. So obviously, there's upside opportunity for reserve and production growth in 2012 and beyond.
Moving to East Texas. We have active drilling operations in our Star Project. Star Project covers 6 counties in East Texas, which includes St. Augustine, Shelby, Jasper, Angelina, Nacogdoches and Sabine.
As part of our initial exploration and delineation phase, which consists of a 4-well program in 2012, we have drilled our second horizontal well to total measured depth of 13,976 feet targeting the James Lime formation. We have set casing and a rig is moving off location and we are currently installing facilities. We expect to complete and frac this well in mid-June. After reviewing the initial results, we plan to drill 2 additional horizontal wells in 2012, which should provide sufficient data to determine future development plans. The estimated cost per well is $6.4 million with a targeted IP rate of 833 barrels of oil equivalent per day gross. If successful, we estimate that this project could yield 15 million barrels of oil equivalent, net of which has been booked as proved reserves to date. On these onshore areas, we'll continue to evaluate potential bolt-on acquisitions and increase our lease hold acreage position.
Let's talk about the budget. Our capital budget for 2012, $425 million excluding acquisitions. Our plan drilling program is currently progressing according to our schedule. During the first quarter of 2012, our oil and gas capital expenditures were $84.6 million, which included $46.4 million for onshore activities and $33.4 million for offshore activities with another $4.8 million for seismic leasehold and other costs.
Our exploration projects accounted for 20%, while seismic -- and while development projects, seismic leasehold and other costs accounted for the remaining 80%. We are still targeting to drill 10 offshore wells and 65 onshore wells with an investment of about $167 million for exploration activities and $258 million for development activities. Most of all, all budget is directed at oil and liquids-rich projects. It should be noted that W&T has historically drilled within cash flow and most of the time, has operated completely within cash flow. We plan to participate with a 20% interest in a deepwater exploration well in 2012. Since that well is nonoperated, we are not in control of the timing however, we view this well as a strong exploration project which could have significant impact on the company if successful. We plan to provide more details about that well as we approach the spud date.
With that, I will turn the call over to Steve Schroeder to update you on some other operational items.