TEXAS · WELLS · GLASSCOCK COUNTY · API 42-173-31708 · DISTRICT 7B
Calverley 27 A #4
Glasscock County · Spraberry (Trend Area) field · Shut In · Vertical
Calverley 27 A #4 (API 42-173-31708) is a well in Glasscock County operated by Diamondback E&P LLC, completed November 8, 2022 and listed as shut in on the RRC schedule, shut in April 1, 2017.
The RRC has issued one drilling permit, issued October 4, 1984, permitted to 8,800 ft.
It was permitted by Cox, John L. and has since transferred to Diamondback E&P LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Redbeds, Spraberry, Dean.
Its 2 leases have reported 188K barrels of oil and 792K mcf of gas since January 1993, last reporting in July 2026. The leases carry 13 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Cox, John L.; 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
- 5,237
- Phone
- (432) 221-7400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | COG Operating LLC |
| Production reports | Diamondback E&P LLCthrough Apr 2026 |
| Latest permit | Cox, John L.Oct 4, 1984 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,800
- total depth, ft
- 1
- permits on file
- Oct 4, 1984
- last permit issued
- Nov 8, 2022
- completed
- 188K
- cumulative oil, bbl
- 792K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 8, 2022
- Shut in
- Apr 1, 2017
- 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.
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 13 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Calverley 27 'A' O-10-53012 | Spraberry (Trend Area) | Diamondback E&P LLC | 4 | 13.5K | 69.7K | Nov 2019 – Jul 2026 |
| Calverley 27 O-10-22943 | Spraberry (Trend Area) | COG Operating LLC | 9 | 175K | 722K | Jan 1993 – May 2024 |
Gas, mcf lease total
Last 12 months 37,345 · prior 12 9,454(+295%)
Oil, barrels lease total
Last 12 months 5,207 · prior 12 1,534(+239%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Cox, John L.Jan 1993 → Sep 2003
- 2JM Cox Resources, L.P.Oct 2003 → Aug 2014
- 3RSP Permian, LLCOct 2014 → Jul 2018
- 4COG Operating LLCAug 2018 → Oct 2019
- 5Diamondback E&P LLCNov 2019 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 253467-99 | Drill | Cox, John L. | Oct 3, 1984 | Oct 4, 1984 | — | 9,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Nov 8, 2022 | Calverley 27 A O-10-53012 | Spraberry (Trend Area) | Diamondback E&P LLC | Shut In · shut in Apr 1, 2017 | 8,800 |
| Jan 20, 1985 | Calverley 27 O-10-22943 | Spraberry (Trend Area) | COG Operating LLC | Not on Schedule | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,700 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,752 | 6,778 | Perforated |
| 7,300 | 7,764 | Perforated |
| 8,122 | 8,460 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 360 | 17.5 | 400 S |
| 8.625 | 4,207 | 12.25 | 1,000 S |
| 4.5 | 8,800 | 7.875 | 1,400 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 6, 2023 | Jan 20, 2023 | — |
| 00 | Feb 26, 2020 | Jan 30, 1985 | — |
| 00 | Feb 13, 1985 | Jan 30, 1985 | — |
| 00 | Feb 12, 1985 | — | — |
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 42-173-31708 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-173-31708 → 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/17331708, documented in the API reference.