WELL · 42-127-34139 · DISTRICT 1
Big Wells Unit #1
Dimmit County · Pearsall (Austin Chalk) field · Producing · Horizontal
Big Wells Unit #1 (API 42-127-34139) is a horizontal well in Dimmit County operated by Duplantis Energy LLC, completed August 3, 2011 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued June 3, 2011, permitted to 7,000 ft.
It was permitted by Killam Oil CO., Ltd. and has since transferred to Duplantis Energy LLC on the wellbore schedule.
Completion filings report 2 formation tops, including Anacacho, Austin Chalk.
Its lease has reported 166K barrels of oil and 10.5K mcf of gas since July 2011, last reporting in July 2026.
Operator of record
Permitted by Killam Oil Co., Ltd.; the EWA schedule now lists a different operator.
Pleasanton, TX · P-5 Y, filed Sep 4, 2025 · (409) 626-4153
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Duplantis Energy LLC |
| Production reports | Duplantis Energy, LLCthrough Apr 2026 |
| Latest permit | Killam Oil Co., Ltd.Jun 3, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 7,000
- total depth, ft
- 1
- permits on file
- Jun 3, 2011
- last permit issued
- Aug 3, 2011
- completed
- 166K
- cumulative oil, bbl
- 10.5K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jul 2011 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Aug 3, 2011
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
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; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Big Wells Unit O-1-16019 | Pearsall (Austin Chalk) | Duplantis Energy, LLC | 1 | 166K | 10.5K | Jul 2011 – Jul 2026 |
Oil, barrels lease total
Last 12 months 14 · prior 12 6,409(-100%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Killam Oil Co., Ltd.Jul 2011 → Jul 2018
- 2Duplantis Energy, LLCMay 2022 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 717538-99 | Drill | Killam Oil Co., Ltd. | Jun 1, 2011 | Jun 3, 2011 | Jul 3, 2011 | 7,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-16019 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 510 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 6,000 | -5,490 |
| Austin Chalk | 6,278 | -5,768 |
| Austin ChalkAUSTIN CHALK B1 | 6,375 | -5,865 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,020 | 11,105 | Open hole |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 750 | 12.25 | 355 S |
| 7 | 6,020 | 8.75 | 202 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 | Oct 1, 2012 | Oct 21, 2011 | 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 42-127-34139 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-127-34139 → 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/12734139, documented in the API reference.