WELL · 42-321-32178 · DISTRICT 3
McWilliams Oil Unit #4
Matagorda County · Hamman field · Vertical
Mcwilliams Oil Unit #4 (API 42-321-32178) is a well in Matagorda County operated by Atlas Operating LLC, completed February 13, 2011.
The RRC has issued 2 drilling permits (amended once) between 2007 and 2011, permitted to 10,400 ft.
It was permitted by Alta Mesa Services, LP and has since transferred to Atlas Operating LLC on the wellbore schedule.
Completion filings report 2 formation tops, including Frio, Upper Crooker.
Its 3 leases have reported 11K barrels of oil and 132K mcf of gas since December 2007, last reporting in July 2026. The leases carry 3 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Alta Mesa Services, LP; the EWA schedule now lists a different operator.
Houston, TX · P-5 Y, filed Oct 4, 2025 · 78 permits on file · (281) 893-9400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Atlas Operating LLC |
| Production reports | Atlas Operating LLCthrough Aug 2023 |
| Latest permit | Alta Mesa Services, LPApr 18, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,400
- total depth, ft
- 3
- permits on file
- Apr 18, 2011
- last permit issued
- Feb 13, 2011
- completed
- 11K
- cumulative oil, bbl
- 132K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2007 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Feb 13, 2011
- Shut in
- —
- Plugged
- —
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 3 leases 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 |
|---|---|---|---|---|---|---|
| McWilliams Gas Unit G-3-233363 | Bay City, East (10,000 B) | Atlas Operating LLC | 1 | 0 | 5.43K | Dec 2007 – Jul 2026 |
| McWilliams Oil Unit G-3-284393 | Hamman | Atlas Operating LLC | 1 | 0 | 11.9K | Jan 2016 – Jul 2026 |
| McWilliams Oil Unit O-3-25759 | Hamman | Atlas Operating LLC | 1 | 11K | 115K | Feb 2011 – May 2025 |
Gas, mcf lease total
Last 12 months 0 · prior 12 0
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Expro Engineering, Inc.Mar 2008 → Feb 2010
- 2Alta Mesa Services, LPFeb 2011 → Sep 2014
- 3Atlas Operating LLCJan 2016 → Aug 2023
- 4Gaither Petroleum CorporationJul 2016 → Jan 2018
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 714239-98 | Recompletion | Alta Mesa Services, LP | Dec 14, 2011 | Apr 18, 2011 | Jan 4, 2011 | 10,262 |
| 714239-99 | Recompletion | Alta Mesa Services, LP | Apr 13, 2011 | Apr 18, 2011 | — | 9,265 |
| 641692-99 | Drill | Alta Mesa Services, LP | Jun 29, 2007 | Aug 9, 2007 | Nov 8, 2007 | 10,400 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-3-233363 | — | — | — | — |
| — | — G-3-284393 | — | — | — | — |
| — | — O-3-25759 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 47 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| FrioFRIO SANDSTONE | 7,885 | -7,838 |
| Upper Crooker | 8,174 | -8,127 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,174 | 8,180 | Perforated |
| 10,182 | 10,198 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 2,000 | 17.5 | 1,960 S |
| 9.625 | 10,246 | 12.25 | 1,500 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 | Apr 1, 2019 | Jan 24, 2018 | Yes |
| 00 | May 7, 2012 | May 12, 2011 | Yes |
| 00 | Aug 15, 2008 | Jul 14, 2008 | — |
| 00 | Mar 26, 2008 | Jan 23, 2008 | Yes |
| 00 | Feb 29, 2008 | — | 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 42-321-32178 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-321-32178 → 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/32132178, documented in the API reference.