WELL · 42-389-36438 · DISTRICT 8
The Sphinx #751H
Reeves County · Wolfbone (Trend Area) field · Producing · Horizontal
The Sphinx #751H (API 42-389-36438) is a horizontal well in Reeves County operated by U.S. Energy Development Corp, completed October 19, 2018 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued October 17, 2017, permitted to 10,700 ft.
It was permitted by Cog Operating LLC and has since transferred to U.S. Energy Development Corp on the wellbore schedule.
Completion filings report 8 formation tops, including Delaware, Castile, Bell Canyon, Cherry Canyon.
Its lease has reported 3.41M barrels of oil and 14M mcf of gas since November 2017, last reporting in July 2026. The lease carries 8 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by COG Operating LLC; the EWA schedule now lists a different operator.
Fort Worth, TX · P-5 Y, filed Jan 5, 2026 · 225 permits on file · (800) 357-9165
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | U.S. Energy Development Corp |
| Production reports | U.S. Energy Development Corpthrough Apr 2026 |
| Latest permit | COG Operating LLCOct 17, 2017 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,700
- total depth, ft
- 1
- permits on file
- Oct 17, 2017
- last permit issued
- Oct 19, 2018
- completed
- 3.41M
- cumulative oil, bbl
- 14M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Nov 2017 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Oct 19, 2018
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
Surface location
31.394864, -103.393592
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in Reeves County.
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 8 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| The Sphinx O-10-49497 | Wolfbone (Trend Area) | U.S. Energy Development Corp | 8 | 3.41M | 14M | Nov 2017 – Jul 2026 |
Gas, mcf lease total
Last 12 months 1,190,804 · prior 12 1,206,852(-1%)
Oil, barrels lease total
Last 12 months 131,151 · prior 12 140,678(-7%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1COG Operating LLCNov 2017 → Mar 2025
- 2U.S. Energy Development CorpApr 2025 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 831676-99 | Drill | COG Operating LLC | Oct 5, 2017 | Oct 17, 2017 | Mar 3, 2018 | 10,700 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-49497 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,578 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| DelawareFORD-DELAWARE | 2,500 | 78 |
| CastileCASTILLE | 2,800 | -222 |
| Delaware | 4,935 | -2,357 |
| Bell Canyon | 4,974 | -2,396 |
| Cherry Canyon | 5,899 | -3,321 |
| DelawareDELAWARE CONSOLIDATED GAS | 6,500 | -3,922 |
| Bone SpringBONE SPRINGS | 8,093 | -5,515 |
| Pennsylvanian | — | — |
| Permian (undifferentiated)PERMIAN | — | — |
| Wolfcamp | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,738 | 20,761 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 2,190 | 17.5 | 2,130 S |
| 9.625 | 9,921 | 12.25 | 1,070 S |
| 5.5 | 20,888 | 8.5 | 4,590 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 | Feb 19, 2019 | Dec 26, 2018 | Yes |
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 42-389-36438 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-389-36438 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward) and the University Lands library. then paste it into their search.
Nearby wells and their tops
NEAREST 8 LOCATED WELLS WITH TOPS · WITHIN 16 KM
Draw a cross-section
This well's tops beside its 5 nearest neighbours, subsea-aligned so they line up regardless of surface terrain.
The Sphinx42-389-36440
0.0 KM · COG Operating LLC · Section with this well →
| Delaware | 2,500 | 78 |
| Castile | 2,800 | -222 |
| Delaware | 4,935 | -2,357 |
| Bell Canyon | 4,974 | -2,396 |
| Cherry Canyon | 5,899 | -3,321 |
| Delaware | 6,500 | -3,922 |
| Bone Spring | 8,093 | -5,515 |
| Wolfcamp | 10,633 | -8,055 |
10 TOPS · FIRST 8
The Sphinx42-389-36439
0.0 KM · COG Operating LLC · Section with this well →
| Delaware | 2,500 | 78 |
| Castile | 2,800 | -222 |
| Delaware | 4,940 | -2,362 |
| Bell Canyon | 4,979 | -2,401 |
| Cherry Canyon | 5,904 | -3,326 |
| Delaware | 6,500 | -3,922 |
| Bone Spring | 8,098 | -5,520 |
| Pennsylvanian | — |
10 TOPS · FIRST 8
The Sphinx42-389-37204
0.2 KM · COG Operating LLC · Section with this well →
| Delaware | 2,500 | 82 |
| Castile | 2,800 | -218 |
| Delaware | 4,926 | -2,344 |
| Bell Canyon | 4,965 | -2,383 |
| Cherry Canyon | 5,890 | -3,308 |
| Delaware | 6,500 | -3,918 |
| Bone Spring | 8,084 | -5,502 |
| Wolfcamp | 10,637 | -8,055 |
10 TOPS · FIRST 8
The Sphinx42-389-37205
0.2 KM · COG Operating LLC · Section with this well →
| Delaware | 2,500 | 82 |
| Castile | 2,800 | -218 |
| Delaware | 4,921 | -2,339 |
| Bell Canyon | 4,960 | -2,378 |
| Cherry Canyon | 5,885 | -3,303 |
| Delaware | 6,500 | -3,918 |
| Bone Spring | 8,079 | -5,497 |
| Wolfcamp | 10,631 | -8,049 |
10 TOPS · FIRST 8
The Sphinx42-389-37206
0.2 KM · COG Operating LLC · Section with this well →
| Delaware | 2,500 | 81 |
| Castile | 2,800 | -219 |
| Delaware | 4,940 | -2,359 |
| Bell Canyon | 4,979 | -2,398 |
| Cherry Canyon | 5,904 | -3,323 |
| Delaware | 6,500 | -3,919 |
| Bone Spring | 8,098 | -5,517 |
| Pennsylvanian | — |
10 TOPS · FIRST 8
Red Rock N42-389-37798
0.8 KM · Centennial Resource Prod, LLC · Section with this well →
| Permian (undifferentiated) | 1,390 | 1,204 |
| Castile | 3,035 | -441 |
| Delaware | 4,943 | -2,349 |
| Delaware | 4,943 | -2,349 |
| Delaware | 4,943 | -2,349 |
| Bell Canyon | 4,965 | -2,371 |
| Cherry Canyon | 5,885 | -3,291 |
| Bone Spring | 8,099 | -5,505 |
10 TOPS · FIRST 8
Red Rock M42-389-37797
0.8 KM · Centennial Resource Prod, LLC · Section with this well →
| Permian (undifferentiated) | 1,390 | 1,204 |
| Castile | 3,035 | -441 |
| Delaware | 4,939 | -2,345 |
| Delaware | 4,939 | -2,345 |
| Delaware | 4,939 | -2,345 |
| Bell Canyon | 4,958 | -2,364 |
| Cherry Canyon | 5,875 | -3,281 |
| Bone Spring | 8,090 | -5,496 |
10 TOPS · FIRST 8
Brass Monkey State Unit42-389-36165
0.9 KM · COG Operating LLC · Section with this well →
| Delaware | 2,500 | 88 |
| Castile | 2,800 | -212 |
| Delaware | 4,953 | -2,365 |
| Bell Canyon | 4,996 | -2,408 |
| Cherry Canyon | 5,911 | -3,323 |
| Delaware | 6,500 | -3,912 |
| Bone Spring | 8,107 | -5,519 |
| Wolfcamp | 10,647 | -8,059 |
10 TOPS · FIRST 8
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/38936438, documented in the API reference.