HALFMANN 21
HALFMANN 21 is a Texas oil lease in Glasscock County, Railroad Commission district 08, operated by Athlon Holdings LP. It has 1 wellbore on file with the Commission. Reported production runs from March 2014 to August 2026, totalling 141,188 barrels. The lease is currently producing. Fitting a decline curve to that history and pricing the remaining production at today's forward curve values the whole lease — a 100% undivided interest — at about $914K, with roughly $201K expected over the next twelve months. An individual royalty owner receives their own decimal interest times that figure. Over the last twelve months on file it averaged 314 barrels a month. Its strongest month on the record we hold was June 2016, at 1,420 barrels. In our own backtest, leases producing at this rate are forecast to within about 22% of what they went on to produce, and that measured error is the range shown on the page rather than a confidence of our own devising.
Key facts about HALFMANN 21
- Who operates HALFMANN 21?
- HALFMANN 21 is operated by Athlon Holdings LP, Railroad Commission of Texas operator number 036067.
- Where is HALFMANN 21?
- HALFMANN 21 is a Texas oil lease in Glasscock County, Texas, in Railroad Commission district 08. Its Railroad Commission lease number is 45489.
- Is HALFMANN 21 still producing?
- HALFMANN 21 is currently producing. The most recent month of production reported to the Railroad Commission of Texas for HALFMANN 21 is August 2026.
- How much has HALFMANN 21 produced?
- HALFMANN 21 has reported 141,188 barrels of oil (bbl) to the Railroad Commission of Texas between March 2014 and August 2026, from 1 wellbore.
- How much is HALFMANN 21 worth?
- The remaining production from HALFMANN 21 is estimated to be worth about $914K in total as of 27 August 2026, within a range of $713K to $1.1M. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in HALFMANN 21 is a fraction of it. The estimate fits an Arps decline curve to the production HALFMANN 21 has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for HALFMANN 21 is an estimate of value, not an offer and not an appraisal.
- How much income does HALFMANN 21 generate in a year?
- HALFMANN 21 is forecast to net about $201K across the whole undivided lease over the twelve months following 27 August 2026, before income tax. A royalty owner in HALFMANN 21 receives a fraction of that, set by the decimal interest printed on their check stub.
Lease record
| Operator | Athlon Holdings LP |
|---|---|
| Field | Spraberry (Trend Area) |
| County | Glasscock County, Texas |
| RRC district | 08 |
| Lease number | 45489 |
| Wellbores | 1 |
| Reported production | 141,188 bbl |
| First reported | |
| Last reported | |
| Estimated royalty value | $914K |
Where HALFMANN 21 sits
Source: Railroad Commission of Texas lease production records, complete through . Figures on this page were computed on .
Production figures are as reported to the Railroad Commission of Texas. The value shown is an estimate produced by fitting a decline curve to that reported history; it is not an offer or an appraisal. How this estimate is calculated.