The Prentice Field straddles the Terry-Yoakum county line on the Northwest Shelf, producing from carbonate reservoirs in the Clear Fork and Glorieta at roughly 6,800 to 7,700 feet. It is not a single reservoir but a group of them, split into several separately unitized waterfloods, and together they have made more than 200 million barrels. For owners, Prentice is a reminder that "the field" and "your unit" are different things: two tracts a mile apart can sit in different units with different flood histories and very different remaining life.
Source: Texas Railroad Commission production filings, aggregated across RRC field designations 72995498, 72995166, 72999500, 72995001, 72995332. Reported volumes lag the calendar by several months.
Prentice arrived after the first wave of Northwest Shelf giants. Wasson, Slaughter and Seminole were all found in 1936; Prentice came more than a decade later. The Texas Almanac dates the discovery to 1949, while Railroad Commission reservoir records carry the main Prentice (6700) reservoir with a 1950 discovery year, and later company filings state plainly that the field was discovered in 1950. The discovery well itself is not well documented in public sources, which is common for post-war Permian discoveries made by geophysics rather than by spectacular blowouts.
Development proceeded by reservoir rather than all at once. The base Prentice reservoir was designated in 1951, Prentice (Clear Fork, Lower) in 1955, Prentice Northwest (San Andres) in 1969, and Prentice (5100) San Andres in 1974. Each designation reflects operators finding a distinct pay with its own pressure system and its own economics. That layering is the reason the field was never operated as one unit and instead ended up divided among several waterflood units drawn around individual reservoirs.
Secondary recovery came early by Permian standards. The Prentice Northeast Unit was formed in 1964 and waterflooding began there in 1965. XTO Energy later held a large operated position in that unit — reported at better than 90 percent working interest across roughly 200 wells — and ran a ten-acre infill drilling program through the early 2000s. Operatorship of individual Prentice units has changed hands since then, and the current operator list varies by unit rather than being one company field-wide.
Prentice produces from Leonardian restricted-platform carbonates: shallow-water dolomites deposited behind a shelf margin where circulation was limited and evaporites are common. Reservoir tops across the field run from roughly 5,900 to 8,100 feet, with the main Clear Fork and Glorieta pay between about 6,800 and 7,700 feet. Restricted-platform carbonates are notorious for low recovery efficiency — porosity is often decent but permeability is layered and discontinuous, so injected water finds thief zones and bypasses tight rock unless the pattern is designed carefully.
Prentice has been developed as a set of waterfloods rather than one field-wide project, with the Northeast Unit flood dating to 1965 and other units following. Later work focused on infill drilling to ten-acre density, which in a layered carbonate is less about new reservoir than about giving injected water shorter, more controllable paths between wells. Operators and federal screening studies have both flagged the Prentice reservoirs as technically amenable to CO2 flooding, but no active CO2 project in the field has been documented.
Because Prentice is divided into several units across two counties, the single most important question for an owner is which unit your tract participates in and at what tract factor — not what the field as a whole has produced. Flood-supported Clear Fork production declines slowly, so these interests can carry decades of tail value that a simple recent-decline model will understate. The upside case and the downside case both live in the unit paperwork. We buy minerals and royalties in Terry and Yoakum counties and provide free written offers.
County-level well data, production charts, and selling guides for the counties this field spans:
Your division order or check detail will name a unit and a decimal, and the Railroad Commission publishes unit and lease records you can cross-reference. If you have neither, the county deed records plus RRC operator filings are usually enough to reconstruct it. We do that work as part of preparing an offer, and we will share what we find whether or not you decide to sell.
It is different, not automatically better or worse. A shale royalty pays a lot early and declines steeply. A mature waterflood like Prentice pays less per month but declines slowly and can run for decades. Buyers who model both correctly will price them differently, which is exactly why a one-size-fits-all offer on a flood interest is worth questioning.
Not by itself. Mature Permian units change hands regularly as they move to operators whose cost structure fits low-rate production, and a new operator often invests in workovers the previous one deferred. What matters is the current owner’s activity level in your specific unit, which is a question about filings and permits rather than about the company name on your check.