GRANTHAM 50
GRANTHAM 50 is a Texas oil lease in Martin County, Railroad Commission district 08, operated by Cobra Oil & Gas Corporation. It has 2 wellbores on file with the Commission. Reported production runs from November 2010 to August 2026, totalling 134,891 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 $1.0M, with roughly $181K 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 181 barrels a month, about 90 per wellbore. Its strongest month on the record we hold was June 2016, at 1,162 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 GRANTHAM 50
- Who operates GRANTHAM 50?
- GRANTHAM 50 is operated by Cobra Oil & Gas Corporation, Railroad Commission of Texas operator number 163000.
- Where is GRANTHAM 50?
- GRANTHAM 50 is a Texas oil lease in Martin County, Texas, in Railroad Commission district 08. Its Railroad Commission lease number is 40756.
- Is GRANTHAM 50 still producing?
- GRANTHAM 50 is currently producing. The most recent month of production reported to the Railroad Commission of Texas for GRANTHAM 50 is August 2026.
- How much has GRANTHAM 50 produced?
- GRANTHAM 50 has reported 134,891 barrels of oil (bbl) to the Railroad Commission of Texas between November 2010 and August 2026, from 2 wellbores.
- How much is GRANTHAM 50 worth?
- The remaining production from GRANTHAM 50 is estimated to be worth about $1.0M in total as of 26 August 2026, within a range of $809K to $1.3M. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in GRANTHAM 50 is a fraction of it. The estimate fits an Arps decline curve to the production GRANTHAM 50 has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for GRANTHAM 50 is an estimate of value, not an offer and not an appraisal.
- How much income does GRANTHAM 50 generate in a year?
- GRANTHAM 50 is forecast to net about $181K across the whole undivided lease over the twelve months following 26 August 2026, before income tax. A royalty owner in GRANTHAM 50 receives a fraction of that, set by the decimal interest printed on their check stub.
Lease record
| Operator | Cobra Oil & Gas Corporation |
|---|---|
| Field | Spraberry (Trend Area) |
| County | Martin County, Texas |
| RRC district | 08 |
| Lease number | 40756 |
| Wellbores | 2 |
| Reported production | 134,891 bbl |
| First reported | |
| Last reported | |
| Estimated royalty value | $1.0M |
Where GRANTHAM 50 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.