TEXAS · WELLS · MATAGORDA COUNTY · API 42-321-00066 · DISTRICT 03
Ohio-Sun Unit #21A
Matagorda County · Markham N.-Bay City N(cornelius) field · Shut In · Vertical
Ohio-Sun Unit #21A (API 42-321-00066) is a well in Matagorda County operated by Goldking Minerals Mgmt L.L.C., completed September 13, 2008 and listed as shut in on the RRC schedule, shut in January 1, 1998.
The RRC has issued 3 drilling permits between 1982 and 1993, permitted to 8,125 ft.
It was permitted by Marathon Oil Company and has since transferred to Goldking Minerals Mgmt L.L.C. on the wellbore schedule.
Completion filings report 3 formation tops, including Miocene (undifferentiated), Anahuac, Frio.
Its 2 leases have reported 1.05M barrels of oil and 1.25M mcf of gas since January 1993, last reporting volume in April 2026. The leases carry 54 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Marathon Oil Company; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Jun 10, 2026
- Permits on file
- 1
- Phone
- (713) 228-5464
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Goldking Minerals Mgmt L.L.C. |
| Production reports | Allegiant Resources, LLCthrough Apr 2026 |
| Latest permit | Marathon Oil CompanyNov 18, 1993 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,125
- total depth, ft
- 3
- permits on file
- Nov 18, 1993
- last permit issued
- Sep 13, 2008
- completed
- 1.05M
- cumulative oil, bbl
- 1.25M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Sep 13, 2008
- Shut in
- Jan 1, 1998
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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 54 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 – Apr 2026 |
| Ohio Sun Unit G-3-104148 | Markham N.-Bay CITY,N(MARK.7900) | Marathon Oil Company | 1 | 0 | 0 | Jan 1993 – — |
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 |
|---|---|---|---|---|---|---|
| 418433-99 | Recompletion | Marathon Oil Company | Nov 18, 1993 | Nov 18, 1993 | Oct 19, 1993 | 8,125 |
| 333434-99 | Recompletion | Marathon Oil Company | Jul 24, 1987 | Jul 30, 1987 | — | 8,125 |
| 179192-99 | Recompletion | Marathon Oil Company | Nov 29, 1982 | Nov 29, 1982 | — | 8,125 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Sep 13, 2008 | Ohio-Sun Unit O-3-2998 | Markham N.-Bay City N(cornelius) | Goldking Minerals Mgmt L.L.C. | Shut In · shut in Jan 1, 1998 | 8,125 |
| Feb 13, 1983 | Ohio Sun Unit G-3-104148 | Markham N.-Bay City N(MARK.7900) | Marathon Oil Company | Not on Schedule | — |
| — | Ohio-Sun Unit G-3-66360 | Markham N.-Bay City N. (7470) | Marathon Oil Company | Not on Schedule | — |
| — | Ohio-Sun Unit O-3-2998 | Markham N.-Bay City N(cornelius) | Goldking Minerals Mgmt L.L.C. | Not on Schedule | — |
| — | Ohio-Sun Unit O-3-2996 | Markham N.-Bay City N (Carlson) | Goldking Minerals Mgmt L.L.C. | Not on Schedule | — |
Formation tops
As filed on W-2/G-1. Subsea from 73 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Miocene (undifferentiated)MIOCENE | 2,000 | -1,927 |
| Anahuac | 5,500 | -5,427 |
| Frio | 6,500 | -6,427 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,470 | 7,475 | Perforated |
| 7,660 | 7,688 | Perforated |
| 7,666 | 7,669 | Perforated |
| 7,680 | 7,682 | Perforated |
| 7,686 | 7,688 | Perforated |
| 7,938 | 7,944 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 1,574 | 15 | 800 S |
| 2.375 | 7,799 | — | — |
| 5.5 | 8,114 | 9.875 | 675 S |
| 5.5 | 8,114 | — | — |
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. The record date is the RRC's own date on the record, not the day the report was filed: 462,034 of the state's filings carry 1984-01-12. About these reports →
| Suffix | RRC record date | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Feb 2, 2009 | Dec 9, 2008 | — |
| 00 | Jan 25, 1994 | Dec 10, 1993 | Yes |
| 00 | Dec 16, 1993 | — | — |
| 00 | Jan 12, 1984 | Mar 3, 1983 | — |
| 00 | Jan 12, 1984 | May 17, 1976 | — |
| 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 42-321-00066 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-321-00066 → scanned completion filings
Log images filed since 2004 open from the RRC's log search for this well; none are loaded here for it.
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/32100066, documented in the API reference.