TEXAS · WELLS · DAWSON COUNTY · SOUTH WELCH UNIT LEASE · API 42-115-31511 · DISTRICT 7B
South Welch Unit #510 W
Dawson County · Welch field · Vertical
South Welch Unit #510 W (API 42-115-31511) is a plugged well in Dawson County, plugged August 10, 2022, last operated by Hilcorp Energy Company.
The RRC has issued one drilling permit, issued April 24, 1981, permitted to 5,200 ft.
It was permitted by Cities Service Company and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report 3 formation tops, including Queen, Grayburg, San Andres.
Its lease has reported 12.8M barrels of oil and 43.7M mcf of gas since the record begins in January 1993, last reporting volume in April 2026. The lease carries 274 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Cities Service Company; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Mar 27, 2026
- Permits on file
- 3,458
- Phone
- (713) 209-2400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Hilcorp Energy Company |
| Production reports | OXY USA WTP EOR, LLCthrough Apr 2026 |
| Latest permit | Cities Service CompanyApr 24, 1981 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 5,200
- total depth, ft
- 1
- permits on file
- Apr 24, 1981
- last permit issued
- Sep 23, 2009
- completed
- 12.8M
- cumulative oil, bbl
- 43.7M
- 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
- OFF SCHEDULE
- Completed
- Sep 23, 2009
- Shut in
- —
- Plugged
- Aug 10, 2022
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; they carry 274 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| South Welch Unit O-11-60337 | Welch | OXY USA WTP EOR, LLC | 274 | 12.8M | 43.7M | by Jan 1993 – Apr 2026 |
Oil, barrels lease total
Last 12 months 67,671 · prior 12 81,324(-17%)
Gas, mcf lease total
Last 12 months 70,235 · prior 12 75,216(-7%)
Wells named South Welch Unit
Hilcorp Energy Company's other wells filed under this lease name in Dawson 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.
- 1OXY USA Inc.Jan 1993 → Dec 2000
- 2OXY USA WTP LPJan 2001 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 115972-99 | Drill | Cities Service Company | Apr 24, 1981 | Apr 24, 1981 | Jul 11, 1981 | 5,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Sep 23, 2009 | South Welch Unit O-11-60337 | Welch | Hilcorp Energy Company | Plugged | — |
Formation tops
As filed on W-2/G-1. Subsea from 3,090 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Queen | 3,824 | -734 |
| Grayburg | 4,207 | -1,117 |
| San Andres | 4,850 | -1,760 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,850 | 4,979 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,851 | 12.25 | 900 S |
| 5.5 | 5,022 | 7.875 | 1,150 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 | Aug 5, 2022 | Apr 6, 2022 | — |
| 00 | May 13, 1999 | Sep 16, 1998 | — |
| 00 | May 25, 1984 | Jun 1, 1982 | — |
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 42-115-31511 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-115-31511 → 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.
Beyond the permit record
RRC UIC permits · H-10 reported volumes
Injection
- 81.1K
- bbl, last 12 reported months
- 2.76M
- bbl, all reported
- Aug 2022
- reported through
| UIC | Kind | Status | Permitted bbl/d | Max psi | Zone ft |
|---|---|---|---|---|---|
| 000044026 | H-1 Injection | Plugged Aug 29, 2022 | 5,000 | 2,225 | 4,450–6,250 |
MONTHLY INJECTED, BBL · H-10 · LAST 24 REPORTED MONTHS
Last 12 months 81,132 · prior 12 70,261(+15%)
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/11531511, documented in the API reference.