DARLENE 1-STX
DARLENE 1-STX is a Texas oil lease in Frio County, Railroad Commission district 01, operated by Formentera Operations LLC. It has 1 wellbore on file with the Commission. Reported production runs from August 2024 to August 2026, totalling 137,383 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 $2.1M, with roughly $1.3M 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 5,766 barrels a month. Its strongest month on the record we hold was March 2025, at 26,262 barrels. In our own backtest, leases producing at this rate are forecast to within about 17% 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 DARLENE 1-STX
- Who operates DARLENE 1-STX?
- DARLENE 1-STX is operated by Formentera Operations LLC, Railroad Commission of Texas operator number 276959.
- Where is DARLENE 1-STX?
- DARLENE 1-STX is a Texas oil lease in Frio County, Texas, in Railroad Commission district 01. Its Railroad Commission lease number is 21467.
- Is DARLENE 1-STX still producing?
- DARLENE 1-STX is currently producing. The most recent month of production reported to the Railroad Commission of Texas for DARLENE 1-STX is August 2026.
- How much has DARLENE 1-STX produced?
- DARLENE 1-STX has reported 137,383 barrels of oil (bbl) to the Railroad Commission of Texas between August 2024 and August 2026, from 1 wellbore.
- How much is DARLENE 1-STX worth?
- The remaining production from DARLENE 1-STX is estimated to be worth about $2.1M in total as of 27 August 2026, within a range of $1.7M to $2.4M. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in DARLENE 1-STX is a fraction of it. The estimate fits an Arps decline curve to the production DARLENE 1-STX has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for DARLENE 1-STX is an estimate of value, not an offer and not an appraisal.
- How much income does DARLENE 1-STX generate in a year?
- DARLENE 1-STX is forecast to net about $1.3M across the whole undivided lease over the twelve months following 27 August 2026, before income tax. A royalty owner in DARLENE 1-STX receives a fraction of that, set by the decimal interest printed on their check stub.
Lease record
| Operator | Formentera Operations LLC |
|---|---|
| Field | Indio Tanks (Pearsall) |
| County | Frio County, Texas |
| RRC district | 01 |
| Lease number | 21467 |
| Wellbores | 1 |
| Reported production | 137,383 bbl |
| First reported | |
| Last reported | |
| Estimated royalty value | $2.1M |
Where DARLENE 1-STX 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.