TEXAS · WELLS · MARTIN COUNTY · TOM 4A LEASE · API 42-317-32331 · DISTRICT 7B
Tom 4A #1
Martin County · Spraberry (Trend Area) field · Producing · Vertical
Tom 4a #1 (API 42-317-32331) is a well in Martin County operated by Diamondback E&P LLC, completed June 17, 1981 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued February 17, 1981, permitted to 8,870 ft.
It was permitted by Tamarack Petroleum Company, Inc. and has since transferred to Diamondback E&P LLC on the wellbore schedule.
Its lease has reported 33.6K barrels of oil and 85.1K mcf of gas since the record begins in January 1993, last reporting volume in April 2026.
Operator of record
Permitted by Tamarack Petroleum Company, Inc.; the EWA schedule now lists a different operator.
- Based in
- Midland, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- May 4, 2026
- Permits on file
- 5,254
- Phone
- (432) 221-7400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Diamondback E&P LLC |
| Production reports | Diamondback E&P LLCthrough Apr 2026 |
| Latest permit | Tamarack Petroleum Company, Inc.Feb 17, 1981 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,870
- total depth, ft
- 1
- permits on file
- Feb 17, 1981
- last permit issued
- Jun 17, 1981
- completed
- 33.6K
- cumulative oil, bbl
- 85.1K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · ON RECORD FROM JAN 1993, THE RECORD'S FIRST MONTH, THROUGH APR 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jun 17, 1981
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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.
Wells nearby
Every well with a location on file around this well, in any state, nearest first.
Texas locations come from drilling permits, so most older Texas wells have none and are not listed.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the lease this well is completed on; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Tom 4A O-10-26640 | Spraberry (Trend Area) | Diamondback E&P LLC | 1 | 33.6K | 85.1K | by Jan 1993 – Apr 2026 |
Oil, barrels lease total
Last 12 months 512 · prior 12 692(-26%)
Wells named Tom 4A
Diamondback E&P LLC's other wells filed under this lease name in Martin County, newest permit first. The RRC gives a gas well its own lease number, so the name is what joins the wells of a unit.
Loading the lease's wellsChain of custody
Every operator that reported production on this well's lease, in order.
- 1Tamarack Petroleum Company, Inc.Jan 1993 → Nov 2007
- 2Mariner Energy, Inc.Dec 2007 → Nov 2010
- 3Apache CorporationDec 2010 → Sep 2022
- 4Endeavor Energy Resources L.P.Oct 2022 → Dec 2024
- 5Diamondback E&P LLCJan 2025 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 108549-99 | Drill | Tamarack Petroleum Company, Inc. | Feb 17, 1981 | Feb 17, 1981 | — | 8,850 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jun 17, 1981 | Tom 4A O-10-26640 | Spraberry (Trend Area) | Diamondback E&P LLC | Producing | 8,870 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,191 | 8,702 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 12.75 | 285 | 17.5 | 350 S |
| 8.625 | 3,758 | 11 | 400 S |
| 2.375 | 7,765 | — | — |
| 4.5 | 8,870 | 7.875 | 1,100 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. The record date is the RRC's own date on the record, not the day the report was filed: 462,034 of the state's filings carry 1984-01-12. About these reports →
| Suffix | RRC record date | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Jan 12, 1984 | Jul 3, 1981 | — |
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 42-317-32331 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-317-32331 → scanned completion filings
Log images filed since 2004 open from the RRC's log search for this well; none are loaded here for it. The University Lands library has no per-well link: then paste it into its 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/31732331, documented in the API reference.