WELL · 42-331-31149 · DISTRICT 1
Caligula-Coffield #1
Milam County · O Brien (1950) field · Vertical
Caligula-Coffield #1 (API 42-331-31149) is a plugged well in Milam County, plugged March 22, 2007, last operated by O Brien Operating Company.
The RRC has issued 5 drilling permits between 1981 and 1992, permitted to 5,000 ft.
It was permitted by Heartland Resources, Inc. and has since transferred to O Brien Operating Company on the wellbore schedule.
Completion filings report 2 formation tops, including Midway, Navarro.
Operator of record
Permitted by Heartland Resources, Inc.; the EWA schedule now lists a different operator.
Shreveport, LA · P-5 Y, filed Jul 6, 1998 · 11 permits on file
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | O Brien Operating Company |
| Production reports | Central Plains Oil&gas Corp. (A)through Feb 2003 |
| Latest permit | Heartland Resources, Inc.Jul 15, 1992 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 5,000
- total depth, ft
- 5
- permits on file
- Jul 15, 1992
- last permit issued
- Apr 27, 1984
- completed
- 0
- cumulative oil, bbl
- 41.3K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Mar 2007
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Apr 27, 1984
- Shut in
- —
- Plugged
- Mar 22, 2007
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 2 leases this well is completed on; they carry 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Caligula-Coffield G-1-142183 | O'Brien (1950) | Ads | 1 | 0 | 41.3K | Jan 1993 – Mar 2007 |
| Caligula-Coffield O-1-11930 | Ginny Johnson (Navarro A) | Heartland Resources, Inc. | 1 | 0 | 0 | Jan 1993 – Jan 1995 |
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.
- 1Heartland Resources, Inc.Jan 1993 → Apr 2001
- 2Central Plains Oil&gas Corp. (A)Feb 2003 → Feb 2003
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 400689-99 | Recompletion | Heartland Resources, Inc. | Jun 29, 1992 | Jul 15, 1992 | May 27, 1992 | 3,048 |
| 339241-99 | Recompletion | Heartland Resources, Inc. | Nov 23, 1987 | Nov 24, 1987 | — | 3,040 |
| 278209-99 | Recompletion | O'Brien Operating Company | Jun 19, 1985 | Jun 19, 1985 | — | 3,048 |
| 264001-99 | Recompletion | O'Brien Operating Company | Dec 6, 1984 | Dec 31, 1984 | — | 3,048 |
| 129306-99 | Drill | Energetics, Inc. | Aug 10, 1981 | Aug 10, 1981 | — | 5,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-1-142183 | — | — | — | — |
| — | — O-1-11930 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 486 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 1,946 | 1,956 | Perforated |
| 2,262 | 2,265 | Perforated |
| 2,262 | 2,314 | Perforated |
| 2,310 | 2,314 | Perforated |
| 2,962 | 2,970 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 530 | 12.25 | 450 S |
| 2.375 | 2,290 | — | — |
| 4.5 | 3,040 | 7.875 | 350 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 | Nov 23, 1992 | Sep 8, 1992 | Yes |
| 00 | Sep 9, 1992 | — | — |
| 00 | Feb 8, 1988 | Dec 14, 1987 | Yes |
| 00 | Dec 22, 1987 | — | — |
| 00 | Aug 23, 1985 | Jul 15, 1985 | — |
| 00 | Aug 2, 1985 | — | — |
| 00 | Feb 1, 1985 | Sep 26, 1984 | — |
| 00 | Jan 17, 1985 | May 3, 1984 | — |
| 00 | Jan 12, 1984 | Feb 8, 1982 | — |
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 42-331-31149 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-331-31149 → 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/33131149, documented in the API reference.