WELL · 42-173-35778 · DISTRICT 8
Calverley 4 #1A
Glasscock County · Spraberry (Trend Area) field · Shut IN · Vertical
Calverley 4 #1A (API 42-173-35778) is a well in Glasscock County operated by Cog Operating LLC, completed November 21, 2013 and listed as shut in on the RRC schedule.
The RRC has issued one drilling permit, issued April 29, 2013, permitted to 12,000 ft.
It was permitted by Adventure Expl Partners II, LLC and has since transferred to Cog Operating LLC on the wellbore schedule.
Completion filings report 4 formation tops, including Spraberry, Strawn, Atoka, Mississippian.
Its lease has reported 71.2K barrels of oil and 428K mcf of gas since August 2013, last reporting in July 2026. The lease carries 3 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Adventure Expl Partners II, LLC; the EWA schedule now lists a different operator.
Midland, TX · P-5 Y, filed May 4, 2026 · 4,568 permits on file · (432) 853-2355
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | COG Operating LLC |
| Production reports | COG Operating LLCthrough Oct 2025 |
| Latest permit | Adventure Expl Partners II, LLCApr 29, 2013 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,000
- total depth, ft
- 1
- permits on file
- Apr 29, 2013
- last permit issued
- Nov 21, 2013
- completed
- 71.2K
- cumulative oil, bbl
- 428K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Aug 2013 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 21, 2013
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: X
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 lease this well is completed on; they carry 3 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Calverley 4 O-10-44546 | Spraberry (Trend Area) | COG Operating LLC | 3 | 71.2K | 428K | Aug 2013 – Jul 2026 |
Gas, mcf lease total
Last 12 months 6,891 · prior 12 15,407(-55%)
Oil, barrels lease total
Last 12 months 552 · prior 12 1,213(-54%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Adventure Expl Partners II, LLCAug 2013 → Aug 2014
- 2RSP Permian, LLCSep 2014 → Jul 2018
- 3COG Operating LLCAug 2018 → Oct 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 760999-99 | Drill | Adventure Expl Partners II, LLC | Apr 17, 2013 | Apr 29, 2013 | Jun 10, 2013 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-44546 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,609 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Spraberry | 7,920 | -5,311 |
| Strawn | 10,280 | -7,671 |
| Atoka | 10,450 | -7,841 |
| Mississippian | 11,000 | -8,391 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,920 | 11,065 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 332 | 17.5 | 400 S |
| 8.625 | 3,925 | 11 | 1,000 S |
| 5.5 | 11,355 | 7.875 | 1,750 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 | May 23, 2014 | Jan 22, 2014 | 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 42-173-35778 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-173-35778 → 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/17335778, documented in the API reference.