WELL · 42-321-00378 · DISTRICT 3
Ohio-Sun Unit #12F
Matagorda County · Markham N.-Bay City N (McDonald) field · Vertical
Ohio-Sun Unit #12F (API 42-321-00378) is a well in Matagorda County operated by Comstock Oil & Gas Inc., completed April 25, 1982.
The RRC has issued 4 drilling permits between 1979 and 2018, permitted to 8,900 ft.
It was permitted by Remora Management, LLC and has since transferred to Comstock Oil & Gas Inc. on the wellbore schedule.
Completion filings report 6 formation tops, including Miocene (undifferentiated), Anahuac, Frio, Betts.
Its 3 leases have reported 1.05M barrels of oil and 1.78M mcf of gas since January 1993, last reporting in July 2026. The leases carry 55 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Remora Management, LLC; the EWA schedule now lists a different operator.
Frisco, TX · P-5 Y, filed Nov 5, 2004 · 319 permits on file
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Comstock Oil & Gas Inc. |
| Production reports | Allegiant Resources, LLCthrough Apr 2026 |
| Latest permit | Remora Management, LLCNov 2, 2018 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,900
- total depth, ft
- 4
- permits on file
- Nov 2, 2018
- last permit issued
- Apr 25, 1982
- completed
- 1.05M
- cumulative oil, bbl
- 1.78M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Apr 25, 1982
- Shut in
- —
- Plugged
- —
Surface location
29.043968, -95.997638
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in Matagorda County.
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 55 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Ohio-Sun Unit O-3-2998 | Markham N.-Bay City,n(cornelius) | Allegiant Resources, LLC | 53 | 1.05M | 1.25M | Jan 1993 – Jul 2026 |
| Ohio-Sun Unit G-3-199351 | Markham N.-Bay City, N (W. 3 UP) | Remora Management, LLC | 1 | 0 | 493K | Jan 2004 – Sep 2018 |
| Ohio-Sun Unit G-3-100771 | Markham N.-Bay City,n (McDonald) | Comstock Oil & Gas, Inc. | 1 | 0 | 38.2K | Jan 1993 – Jan 2004 |
Oil, barrels lease total
Last 12 months 9,602 · prior 12 10,776(-11%)
Gas, mcf lease total
Last 12 months 3,577 · prior 12 6,248(-43%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Marathon Oil CompanyJan 1993 → Nov 2002
- 2Comstock Oil & Gas, Inc.Dec 2002 → Oct 2004
- 3Comstock Oil & Gas, LPNov 2004 → Aug 2008
- 4Premier Natural Resources, LLCSep 2008 → Sep 2015
- 5Remora Management, LLCOct 2015 → Jul 2019
- 6Allegiant Resources, LLCAug 2019 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 842716-99 | Recompletion | Remora Management, LLC | Jul 23, 2018 | Nov 2, 2018 | — | 8,900 |
| 538919-99 | Recompletion | Comstock Oil & Gas, Inc. | Nov 21, 2003 | Nov 21, 2003 | Jan 2, 2004 | 8,900 |
| 153938-99 | Recompletion | Marathon Oil Company | Mar 10, 1982 | Mar 10, 1982 | — | 8,900 |
| 48670-99 | Recompletion | Marathon Oil Company | May 17, 1979 | May 17, 1979 | Jun 13, 1979 | 8,900 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-3-100771 | — | — | — | — |
| — | — G-3-199351 | — | — | — | — |
| — | — O-3-2998 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 74 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Miocene (undifferentiated)MIOCENE | 2,000 | -1,926 |
| Anahuac | 5,400 | -5,326 |
| Frio | 6,300 | -6,226 |
| Betts | 8,176 | -8,102 |
| 3RD Upper West | 8,597 | -8,523 |
| West | 8,629 | -8,555 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,500 | — | Perforated |
| 7,768 | 7,779 | Perforated |
| 8,185 | 8,200 | Perforated |
| 8,205 | 8,210 | Perforated |
| 8,314 | 8,323 | Perforated |
| 8,380 | 8,390 | Perforated |
| 8,597 | 8,604 | Perforated |
| 8,671 | 8,704 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 2,054 | 15 | 1,200 S |
| 10.75 | 2,068 | 15 | 1,150 S |
| 2.375 | 7,380 | — | — |
| 2.375 | 8,003 | — | — |
| 2.875 | 8,169 | — | — |
| 7 | 8,863 | 9.875 | 1,000 S |
| 7 | 8,876 | 9.875 | 1,000 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 6, 2020 | Apr 30, 2019 | — |
| 00 | Mar 19, 2004 | Feb 6, 2004 | Yes |
| 00 | Feb 26, 2004 | — | — |
| 00 | Jan 12, 1984 | Jun 10, 1982 | — |
| 00 | Jan 12, 1984 | Jun 24, 1980 | — |
| 00 | Jan 12, 1984 | Apr 15, 1975 | — |
| 00 | Jan 12, 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 42-321-00378 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-321-00378 → 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.
Nearby wells and their tops
NEAREST 8 LOCATED WELLS WITH TOPS · WITHIN 16 KM
Draw a cross-section
This well's tops beside its 5 nearest neighbours, subsea-aligned so they line up regardless of surface terrain.
Ohio-Sun Unit42-321-32443
0.4 KM · Allegiant Resources, LLC · Section with this well →
| Miocene (undifferentiated) | 2,995 | -2,937 |
| Anahuac | 5,770 | -5,712 |
| Frio | 6,540 | -6,482 |
| Gretta - Disposal | 6,684 | -6,626 |
| Grant - Disposal | — | |
| Frio | — | |
| Caprock | — | |
| Willis - Disposal | — |
10 TOPS · FIRST 8
Runnells42-321-32396
2.2 KM · Millennium Exploration Co. LLC · Section with this well →
| Anahuac | 5,750 | -5,698 |
| Frio | 6,600 | -6,548 |
| Carlson | 7,084 | -7,032 |
| Frio | 7,820 | -7,768 |
| Gretta - Disposal | — | |
| Miocene (undifferentiated) | — | |
| Nodosaria | — | |
| Grant - Disposal | — |
11 TOPS · FIRST 8
Express42-321-32438
2.2 KM · Square Mile Energy, L.L.C. · Section with this well →
| Miocene (undifferentiated) | 3,024 | -2,939 |
| Frio | 7,120 | -7,035 |
| Frio | 11,105 | -11,020 |
| Tex Miss | — | |
| Nodosaria | — | |
| Gretta - Disposal | — | |
| Grant - Disposal | — | |
| Anahuac | — |
10 TOPS · FIRST 8
Ohio-Sun Unit42-321-32433
3.4 KM · Allegiant Resources, LLC · Section with this well →
| Frio | 6,658 | -6,599 |
| Anahuac | — | |
| Grant - Disposal | — | |
| Gretta - Disposal | — | |
| Miocene (undifferentiated) | — | |
| Nodosaria | — | |
| Tex Miss | — | |
| Tex Miss 3 Sand | — |
11 TOPS · FIRST 8
Ohio-Sun Unit42-321-32434
3.5 KM · Allegiant Resources, LLC · Section with this well →
| Anahuac | 5,852 | -5,793 |
| Frio | 6,667 | -6,608 |
| Frio | 6,667 | -6,608 |
| Gretta - Disposal | 6,667 | -6,608 |
| Miocene (undifferentiated) | — | |
| Grant - Disposal | — | |
| Caprock | — | |
| Willis - Disposal | — |
10 TOPS · FIRST 8
F.G. Cobb 'B'42-321-00444
4.5 KM · Urban Oil & Gas Group, LLC · Section with this well →
| Frio | 6,932 | -6,866 |
F. G. Cobb -B-42-321-00445
4.5 KM · Urban Oil & Gas Group, LLC · Section with this well →
| 7900 Frio | 7,016 | -6,946 |
| 8000 Frio | 7,986 | -7,916 |
| 8400 Frio | 8,362 | -8,292 |
F. G. Cobb B42-321-00465
4.6 KM · Urban Oil & Gas Group, LLC · Section with this well →
| 7000 Frio | 7,040 | -6,971 |
| 7200 Frio | 7,250 | -7,181 |
| 7500 Frio | 7,482 | -7,413 |
| 8400' Frio | 8,362 | -8,293 |
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/32100378, documented in the API reference.