Logs
Well and field data
Below are brief descriptions of the well and field data which is available on a CD ROM that will assist in evaluations. Nueces Minerals has made data submission a requirement on all leases, resulting in an expanding data library on the property, going back to the Munson Field in the 1930’s. A portion of this data is in numbered folders on the CD ROM (CD available on request). The well locations are marked on the property map. Contact the company for more complete information.
1. In 1964, Phillips Petroleum #1 NL&L was drilled (the third deepest well in the world at the time). It had gas shows at 9880′-10,450′, 11,720′-13,050′, 13,220′-14,450′.
2. In 1979, Cities Service Company #2A Nueces Minerals Company was drilled as a Sligo Reef Well. Logs show gas in the upper Sligo from 15,572′ to 15,692′. Cities Service plugged this well. They had farmed out their acreage to Kilroy to drill the #1 Wheeler twenty miles east northeast of the cities Service Company #2A well along this Sligo Trend. This Wheeler well was named Kilroy Wheeler, Railroad Commission lease number 107743. The Kilroy Wheeler was put on line selling 20 MM cubic feet per day. This well produced over 32 BCF prior to being plugged for mechanical casing problems.
3. In 1983, the Santa Fe Minerals #1, Nueces Minerals Company Sligo Reef test had gas shows and log shows at 16,960′ to 17,075′ and 17,542′ to 17,558′. The well was being drilled with 16# mud. Santa Fe was encouraged by the gas shows and planned to penetrate the entire reef. At 17,670′, the bit dropped 10′ without rotation. The well flowed on choke: gas with calcite crystals 1″ long, and salt water. It took 20# mud and numerous trips to seal off the well below 17,650′. Santa Fe ran logs and 7″ stainless casing. The high temperature combined with severe mud invasion of the 20# invermil mud and numerous trips had sealed off the gas zones above. Santa Fe perforated the zones, acidized and generally got no flow of any kind, except that on one interval the well did start cleaning up. The tubing pressure started increasing and bringing gas, unfortunately the wellhead pressure got over 10,000# breaking the 10,000# gauges and causing the 10,000# valves to start leaking excessively at their stems. The engineers on location were inexperienced and ordered and installed the wrong tree! The well was killed and a new 15000# tree put on, but the 450+ degree temperature apparently caused the mud to reset- the well would not flow.
4. In 1985, the Sandefer Oil & Gas #1 Nueces Minerals Company well was drilling at 10,060′ and started flowing from the Olmos. The rig did not have a rotating BOP so the pipe could not be rotated when the BOP was shut. It took several days to get the well under control, but this caused the loss of 4,500′ of stuck drill pipe. It was side-tracked and re-drilled. They set 7″casing to 9,830′ and drilled 6 1/8″ hole to 12,000′. There were numerous gas shows. They logged the well and decided to plug it. Nueces Minerals Company took over the well and set 4 ½” casing on liner and cemented. Subsequent operator attempted completion of Taylor Shale interval with only artificial KCL. Got a show of gas, but also had swelling and heaving of shale. The Olmos interval has not been completed in this well, but it may be commercial at current gas prices.
5. In January, 1985, Shell #1, Section 653-Piedras Creek – Nueces Minerals Company #1 was drilled.
Gas shows 5280 – 5310’ top of Wilcox possibly productive
Gas shows 6440 – 6490’ Wilcox possibly productive
Gas shows 7480 – 7900’
Gas shows 8850 – 9000’
Gas shows 9100 – 9280’
Gas shows 9300 – 9750’
Well flowed at 9574’ and had to be
side tracked and re-drilled to reach total depth.
Induction Mud 1 Mud 2 Sonic Lithodensity
6. In April, 1985, Shell A-1 in Section 655.
Gas show 5290 – 5370′ in Wilcox sand.
Gas show 6510 – 6542′ Looks productive in Wilcox
Gas show 7670 – 7900′ Possibly productive in Escondido
Gas show 9442 – 9455′.
7. Miranda sand & other Shallow Horizons.
Munson Field in Section 119, McMullen County, Texas was discovered in 1930’s in Miranda sand at 1,200′. It produced 580,000 barrels until it was plugged out in the early 1970’s. Wells all completed open hole. Coning of water appears to have been a major problem. There should be additional oil recovery with current technology.
The Rodriguez Field in LaSalle County, 1954, drilled in the Miranda sand at 300′ & 400′ in depth. It has produced 1,900,000 bbls and is still producing.
The Yegua sand is gas bearing and productive at 900′ plus below the Rodriquez field.
The Miranda oil bearing trend extends north of the Rodriquez field. Numerous wells drilled in 1950 & 1975 show oil in low permeability Miranda sand. This trend area may be able to be developed with current technology.