MARY 18B
MARY 18B is a Texas oil lease in Upton County, Railroad Commission district 7C, operated by Pioneer Natural Res. USA, Inc. It has 1 wellbore on file with the Commission. Reported production runs from March 2023 to August 2026, totalling 300,397 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 $14.4M, with roughly $4.3M 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 6,677 barrels a month. Its strongest month on the record we hold was April 2024, at 16,150 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 MARY 18B
- Who operates MARY 18B?
- MARY 18B is operated by Pioneer Natural Res. USA, Inc., Railroad Commission of Texas operator number 665748.
- Where is MARY 18B?
- MARY 18B is a Texas oil lease in Upton County, Texas, in Railroad Commission district 7C. Its Railroad Commission lease number is 22059.
- Is MARY 18B still producing?
- MARY 18B is currently producing. The most recent month of production reported to the Railroad Commission of Texas for MARY 18B is August 2026.
- How much has MARY 18B produced?
- MARY 18B has reported 300,397 barrels of oil (bbl) to the Railroad Commission of Texas between March 2023 and August 2026, from 1 wellbore.
- How much is MARY 18B worth?
- The remaining production from MARY 18B is estimated to be worth about $14.4M in total as of 26 August 2026, within a range of $12.0M to $16.9M. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in MARY 18B is a fraction of it. The estimate fits an Arps decline curve to the production MARY 18B has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for MARY 18B is an estimate of value, not an offer and not an appraisal.
- How much income does MARY 18B generate in a year?
- MARY 18B is forecast to net about $4.3M across the whole undivided lease over the twelve months following 26 August 2026, before income tax. A royalty owner in MARY 18B receives a fraction of that, set by the decimal interest printed on their check stub.
Lease record
| Operator | Pioneer Natural Res. USA, Inc. |
|---|---|
| Field | Spraberry (Trend Area) |
| County | Upton County, Texas |
| RRC district | 7C |
| Lease number | 22059 |
| Wellbores | 1 |
| Reported production | 300,397 bbl |
| First reported | |
| Last reported | |
| Estimated royalty value | $14.4M |
Where MARY 18B 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.