WELL · 42-173-35818 · DISTRICT 8
Calverley 37 #1A
Glasscock County · Spraberry (Trend Area) field · Shut IN · Vertical
Calverley 37 #1A (API 42-173-35818) is a well in Glasscock County operated by Cog Operating LLC, completed October 15, 2013 and listed as shut in on the RRC schedule.
The RRC has issued one drilling permit, issued May 3, 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 87.4K barrels of oil and 599K mcf of gas since October 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 Apr 2026 |
| Latest permit | Adventure Expl Partners II, LLCMay 3, 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
- May 3, 2013
- last permit issued
- Oct 15, 2013
- completed
- 87.4K
- cumulative oil, bbl
- 599K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Oct 2013 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Oct 15, 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 37 O-10-44839 | Spraberry (Trend Area) | COG Operating LLC | 3 | 87.4K | 599K | Oct 2013 – Jul 2026 |
Gas, mcf lease total
Last 12 months 36,422 · prior 12 33,460(+9%)
Oil, barrels lease total
Last 12 months 1,020 · prior 12 1,387(-26%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Adventure Expl Partners II, LLCOct 2013 → Aug 2014
- 2RSP Permian, LLCSep 2014 → Jul 2018
- 3COG Operating LLCSep 2018 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 761849-99 | Drill | Adventure Expl Partners II, LLC | May 1, 2013 | May 3, 2013 | Jul 26, 2013 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-44839 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,708 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Spraberry | 7,715 | -5,007 |
| Strawn | 10,200 | -7,492 |
| Atoka | 10,418 | -7,710 |
| Mississippian | 10,900 | -8,192 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,715 | 10,980 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 404 | 17.5 | 465 S |
| 8.625 | 3,924 | 11 | 1,150 S |
| 5.5 | 11,315 | 7.875 | 1,380 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 | Aug 7, 2014 | Feb 11, 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 42-173-35818 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-173-35818 → 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/17335818, documented in the API reference.