TEXAS · WELLS · UPTON COUNTY · WELCH "12" LEASE · API 42-461-00843 · DISTRICT 6E
Welch 12 #1
Upton County · Spraberry (Trend Area) field · Producing · Vertical
Welch 12 #1 (API 42-461-00843) is a well in Upton County operated by Diamondback E&P LLC, completed January 12, 2004 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued September 24, 2003, permitted to 9,200 ft.
It was permitted by Endeavor Energy Resources L.P. and has since transferred to Diamondback E&P LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Spraberry, Dean, Wolfcamp.
Its lease has reported 128K barrels of oil and 220K mcf of gas since January 2004, last reporting volume in August 2026. The lease carries 4 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Endeavor Energy Resources L.P.; the EWA schedule now lists a different operator.
- Based in
- Midland, TX
- P-5 status
- Active (A)
- 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 Aug 2026 |
| Latest permit | Endeavor Energy Resources L.P.Sep 24, 2003 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,200
- total depth, ft
- 1
- permits on file
- Sep 24, 2003
- last permit issued
- Jan 12, 2004
- completed
- 128K
- cumulative oil, bbl
- 220K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · FEB 2004 THROUGH AUG 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jan 12, 2004
- 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 AUG 2026
Texas reports oil by lease, not by well. These are the lease this well is completed on; they carry 4 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Welch "12" O-9-15517 | Spraberry (Trend Area) | Diamondback E&P LLC | 4 | 128K | 220K | Jan 2004 – Aug 2026 |
Oil, barrels lease total
Last 12 months 772 · prior 12 552(+40%)
Gas, mcf lease total
Last 12 months 510 · prior 12 1,190(-57%)
Wells named Welch 12
Diamondback E&P LLC's other wells filed under this lease name in Upton 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.
- 1Endeavor Energy Resources L.P.Feb 2004 → Dec 2024
- 2Diamondback E&P LLCJan 2025 → Aug 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 536790-99 | Reenter | Endeavor Energy Resources L.P. | Sep 24, 2003 | Sep 24, 2003 | Dec 7, 2003 | 10,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jan 12, 2004 | Welch 12 O-9-15517 | Spraberry (Trend Area) | Diamondback E&P LLC | Producing | 9,200 |
| — | — O-9-1609 | Spraberry (Trend Area) | Wolfson I. J. & Guest Weldon S. | Not on Schedule | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,643 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,778 | 9,109 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 347 | 13.375 | — |
| 7 | 3,995 | 8.5 | 200 S |
| 4.5 | 9,200 | 6.125 | 550 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 | Jun 17, 2004 | Mar 12, 2004 | Yes |
| 00 | May 18, 2004 | — | — |
| 00 | Jan 12, 1984 | — | — |
Well logs
The RRC's map lists this well among those with logs online. Its monthly inventories loaded here, which start in July 2006, list none for it, so none are itemized.
Open the RRC's log search for this well ↗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 42-461-00843 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-461-00843 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search 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/46100843, documented in the API reference.