WELL · 42-417-31345 · DISTRICT 7
Diller #21
Shackelford County · Shackelford County Regular field · Vertical
Diller #21 (API 42-417-31345) is a plugged well in Shackelford County, plugged May 1, 2013, last operated by Comanche Well Service Corp..
The RRC has issued one drilling permit, issued December 22, 1983, permitted to 1,800 ft.
It was permitted by Concho Operating CO. and has since transferred to Comanche Well Service Corp. on the wellbore schedule.
Completion filings report one formation top, including Tannehill.
Its lease has reported 491 barrels of oil and 45 mcf of gas since January 1993, last reporting in July 2026. The lease carries 37 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Concho Operating Co.; the EWA schedule now lists a different operator.
Plano, TX · P-5 Y, filed Dec 4, 2025 · 8 permits on file · (214) 394-0947
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Comanche Well Service Corp. |
| Production reports | Fidelity Petroleum Corporationthrough Apr 1997 |
| Latest permit | Concho Operating Co.Dec 22, 1983 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 1,800
- total depth, ft
- 1
- permits on file
- Dec 22, 1983
- last permit issued
- Jun 15, 1983
- completed
- 491
- cumulative oil, bbl
- 45
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jun 15, 1983
- Shut in
- —
- Plugged
- May 1, 2013
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 37 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Diller O-8-18751 | Shackelford County Regular | Comanche Well Service Corp. | 37 | 491 | 45 | Jan 1993 – Jul 2026 |
No volumes reported on these leases in the last three years.
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1G-3 OilJan 1993 → Jul 1995
- 2Fidelity Petroleum CorporationAug 1995 → Apr 1997
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 224522-99 | Other | Concho Operating Co. | Dec 19, 1983 | Dec 22, 1983 | — | 1,800 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-8-18751 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 1,380 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| TannehillTANNEHILL SAND | 725 | 655 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 725 | 733 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 4.5 | 750 | 6.75 | 110 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 | Jan 30, 1984 | Jan 9, 1984 | — |
| 00 | Jan 26, 1984 | Jan 9, 1984 | — |
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 42-417-31345 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-417-31345 → 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/41731345, documented in the API reference.