WELL · 42-431-30634 · DISTRICT 8
Mahaffey Estate #1
Sterling County · Deck (Cisco) field · Vertical
Mahaffey Estate #1 (API 42-431-30634) is a well in Sterling County operated by Range Production Company, completed April 13, 1978.
The RRC has issued one drilling permit, issued December 30, 1977, permitted to 8,200 ft.
It was permitted by Grand Banks Energy Company and has since transferred to Range Production Company on the wellbore schedule.
Completion filings report 3 formation tops, including Yates, Dean, Cisco.
Its 2 leases have reported 2.16K barrels of oil and 333K mcf of gas since January 1993, last reporting in July 2026. The leases carry 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Grand Banks Energy Company; the EWA schedule now lists a different operator.
- Based in
- Fort Worth, TX
- P-5 status
- Inactive (I)
- P-5 last filed
- Mar 4, 2015
- Permits on file
- 1,666
- Phone
- (817) 870-2601
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Range Production Company |
| Production reports | Burk Royalty Co., Ltd.through Apr 2026 |
| Latest permit | Grand Banks Energy CompanyDec 30, 1977 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,200
- total depth, ft
- 1
- permits on file
- Dec 30, 1977
- last permit issued
- Apr 13, 1978
- completed
- 2.16K
- cumulative oil, bbl
- 333K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Apr 13, 1978
- Shut in
- —
- Plugged
- —
Surface location
No coordinates on the permit record yet. The RRC's GIS record usually lands within days of issuance; historical master-file permits never carry one.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the 2 leases this well is completed on; they carry 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mahaffey Estate G-10-217634 | Deck (Cisco) | Burk Royalty Co., Ltd. | 1 | 0 | 191K | Jun 2006 – Jul 2026 |
| Mahaffey Estate O-10-25129 | Deck (Cisco) | Range Production Company | 1 | 2.16K | 142K | Jan 1993 – Jun 2008 |
Gas, mcf lease total
Last 12 months 9,697 · prior 12 8,729(+11%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Grand Banks Energy CompanyJan 1993 → May 1994
- 2Lomak Production CompanyJun 1994 → Aug 1998
- 3Range Production CompanySep 1998 → Jul 2014
- 4EQT Production Texas, LLCAug 2014 → Jun 2018
- 5Stanolind Production LLCJul 2018 → Dec 2020
- 6Slant Operating, LLCJan 2021 → Dec 2021
- 7Burk Royalty Co., Ltd.Jan 2022 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 15191-99 | Drill | Grand Banks Energy Company | Dec 30, 1977 | Dec 30, 1977 | Feb 16, 1978 | 8,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-10-217634 | — | — | — | — |
| — | — O-10-25129 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,616 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,017 | 8,290 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,943 | 11 | 900 S |
| 8.625 | 1,943 | — | 900 S |
| 2.375 | 8,030 | — | — |
| 4.5 | 8,329 | 7.875 | 200 S |
| 4.5 | 8,329 | — | 200 S |
Completion filings
W-2 and G-1 reports on record in the RRC wellbore file, newest first. The suffix identifies the wellbore or completion event. About these reports →
| Suffix | Filed | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Nov 13, 2006 | Jul 25, 2006 | — |
| 00 | Aug 2, 2006 | — | — |
| 00 | Jan 12, 1984 | Sep 12, 1978 | — |
| 00 | Jan 12, 1984 | Jun 1, 1978 | — |
The source documents
Petrora holds the structured record. The scanned filings live at the RRC; these links open its search already filled in for this API.
- Wellbore filings for 42-431-30634 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-431-30634 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). then paste it into their search.
About this data
Permits from the RRC OGA049M master and daily daf420 files; wellbore and operator of record from the EWA schedule, weekly; completions, formation tops, casing, and perforations from the dbf900 wellbore file; production from PDQ lease reports, which lag two to three months; injection from UIC permits, H-10 reports, and TexNet daily volumes; earthquakes from the TexNet catalog.
New to these records? How to read a well page · API numbers · completion reports and tops · why production is by lease
Developers: this page as JSON is GET /v1/data/wells/43130634, documented in the API reference.