An owner's guide to mineral rights on the West Sundown Unit — operated by Occidental Petroleum (OXY) on the Slaughter field in west Texas Permian Basin.
Get Your Free Mineral ValuationCounty: Hockley County, Texas
Field: Slaughter
RRC District: 11
Operator: Occidental Petroleum (OXY)
Old wells: 71
Oldest spud: 1940 (86+ years of production)
Recent monthly oil production: 30,867 bbl (Feb 2026)
The West Sundown Unit is one of the most active long-tenured oil units in west Texas Permian Basin. With 71 historic wells, an oldest spud date of 1940, and recent monthly production of 30,867 barrels of oil (February 2026), the unit demonstrates the long-tail production profile that characterizes mature unitized oil operations in the Permian Basin (Northwest Shelf).
OXY operates the West Sundown Unit as part of its Slaughter field complex — a long-running Permian waterflood and CO2 EOR position.
The Slaughter field sits in the Permian Basin (Northwest Shelf). The field has been producing oil since 1940 — a continuous production history spanning 86+ years. Modern operating consolidation under the West Sundown Unit framework has stabilized field-level production through pressure maintenance, waterflood, and (where applicable) CO2 enhanced oil recovery (EOR) operations.
For broader context on the Permian Basin (Northwest Shelf) producing region, see our Permian Basin (Northwest Shelf) mineral rights guide.
Mineral interests in the West Sundown Unit typically take one of these forms:
Producing royalty interest — your tract's contribution to the unit's monthly revenue, paid by the operator
Non-producing mineral interest — fee mineral ownership in a tract currently outside active producing zones
Overriding royalty interest (ORRI) — a royalty carved out of a working interest
Non-participating royalty interest (NPRI) — a royalty interest with no leasing or development rights
Many West Sundown Unit interests are inherited multiple generations deep, with original lease bonus paid in the 1930s-1960s era. Current West Sundown Unit mineral owners frequently include heirs spread across multiple states.
Direct buyers value West Sundown Unit mineral interests using a discounted cash flow approach with these key inputs:
Decline rate — typically 3-8% annual on long-life unitized waterflood / EOR wells
Remaining reserve life — often 15-30+ years on actively-maintained units
Operator quality — well-maintained units (Occidental Petroleum (OXY) is established in west Texas Permian Basin) typically deliver predictable production
EOR upside — many Permian Basin (Northwest Shelf) units have CO2 EOR or other tertiary recovery upside not reflected in current production rates
Discount rate — typically 8-12% for stable unitized cash flows
Buckhead Energy buys mineral rights and royalty interests on the West Sundown Unit. Out-of-state owners are common — many interests are inherited multiple generations deep. We handle the entire process remotely: free written offer by email, deed signed before a notary in your state, recorded with the Hockley County clerk, and proceeds wired the day of recording.
Free written offers. No obligation. No fees.
Start Your Free ValuationPermian CO2 EOR (Wasson, Slaughter, Seminole) and Mississippi Jackson Dome CO2 EOR (Heidelberg, Eucutta, Tinsley) are the two largest U.S. CO2 EOR clusters. For owners with interests across both:
Texas vs Mississippi Mature Oil Units — Comparison
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