Historic Oil Field
Briscoe Ranch is the field designation covering a large block of western Eagle Ford development across Dimmit, La Salle and Frio counties. It is one of the quieter names in the play and one of the most significant: the EIA ranked Briscoe Ranch the fifth-largest oil field in the United States by proved reserves as of the end of 2013, when it produced roughly 62 million barrels of oil and lease condensate. For owners in the western Eagle Ford, it is often the name that appears on the division order rather than Eagle Ford itself.
Source: Texas Railroad Commission production filings, aggregated across RRC field designations 12018200, 12018666. Reported volumes lag the calendar by several months.
The Briscoe Ranch name predates the shale era — the EIA’s field code master list carries a discovery year in the early 1960s, from conventional exploration long before anyone considered producing the Eagle Ford. What made the name significant was the horizontal era. Beginning around 2009 and 2010, operators extended the Eagle Ford play west and southwest from the original La Salle County discovery, and the Railroad Commission booked much of that development under the existing Briscoe Ranch designation.
The western counties developed differently from the Karnes-DeWitt core. Wells here produce more gas relative to oil in many areas, land was cheaper, and the drilling pace tracked commodity prices closely — busy in 2012 through 2014, sharply reduced after the 2015 price collapse, and revived when longer laterals improved returns. Dimmit County in particular saw enormous permit volumes during the boom years, and much of that activity reports under Briscoe Ranch.
The field is now a mature shale asset. Most of the acreage is held by production, development has shifted toward infill wells and refracs, and the operating base has consolidated. Owners here frequently hold interests that were leased in the frantic 2010 to 2012 period, often with lease terms that look very different from what a landowner could negotiate today. Because acreage has traded repeatedly, the operator on your check may have changed several times.
In the western Eagle Ford the shale sits shallower and is generally less thermally mature at its updip edge, deepening and gassing up to the southeast. Beneath Dimmit, La Salle and Frio counties the target is the same organic-rich Upper Cretaceous marl found across the play, typically encountered between roughly 6,000 and 11,000 feet depending on position along the trend. Reservoir quality varies more here than in the Karnes core, so well results within a single county can differ substantially. As everywhere in the Eagle Ford, commercial production requires horizontal wells with multi-stage hydraulic fracturing.
Enhanced oil recovery in the traditional sense is not practiced at Briscoe Ranch. There is no flood, no injection pattern and no pressure-maintenance program sweeping the reservoir. What operators do instead is re-engineer wells: refracturing early-generation laterals that were completed with fewer stages and less proppant, converting wells to gas lift as pressure declines, and drilling infill locations between existing producers. Refracs have been a meaningful part of western Eagle Ford activity because so many wells here were drilled with 2011-era completion designs that are now considered undersized.
Briscoe Ranch royalties follow the shale pattern: a sharp early peak, a steep decline, and a thin tail. That is fundamentally different from the flood-supported conventional fields elsewhere in Texas, where a modest check can persist for decades. It also means an owner’s position can change quickly — a refrac or a new infill well can lift income substantially, and a quiet operator can let it fade. Understanding which of those is likely under your specific tract is the whole valuation question. We buy minerals and royalties in Dimmit, La Salle and Frio counties and provide free written offers.
County-level well data, production charts, and selling guides for the counties this field spans:
Effectively yes for most modern wells. Briscoe Ranch is a Texas Railroad Commission field designation that predates shale development, and the state has booked a large volume of horizontal Eagle Ford production under it. The producing formation in these wells is the Eagle Ford Shale even though the field name is older.
Reservoir quality in the western Eagle Ford varies more than in the Karnes County core, and completion design has changed dramatically over the years. A 2012 well with a 5,000-foot lateral and light proppant loading will look nothing like a 2022 well with a two-mile lateral drilled through the same rock a few miles away.
Yes, and refracs have been common in this part of the play precisely because so many early wells were under-completed. A successful refrac can restore a meaningful share of a well’s original rate. It also resets the decline, which means the income bump is real but temporary. We factor refrac potential into how we value western Eagle Ford interests.