TEXAS · WELLS · ATASCOSA COUNTY · API 42-013-31691 · DISTRICT 01
Gossett-Shannon #504
Atascosa County · Pleasanton E. (Escondido) field · Shut In · Vertical
Gossett-Shannon #504 (API 42-013-31691) is a well in Atascosa County operated by Mazco Energy LLC, completed January 26, 2009 and listed as shut in on the RRC schedule, shut in March 1, 2023.
The RRC has issued one drilling permit, issued November 15, 1982, permitted to 4,800 ft.
It was permitted by Sun Expl. & Prod. CO.-Houston and has since transferred to Mazco Energy LLC on the wellbore schedule.
Completion filings report one formation top, including Escondido.
Its 2 leases have reported 85.9K barrels of oil and 8.89K mcf of gas since January 1993, last reporting in July 2026. The leases carry 31 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Sun Expl. & Prod. Co.-Houston; the EWA schedule now lists a different operator.
- Based in
- San Antonio, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Jan 21, 2026
- Permits on file
- 1
- Phone
- (210) 460-9481
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Eagle Ford Oil Co. Inc. |
| Production reports | Mazco Energy LLCthrough Apr 2026 |
| Latest permit | Sun Expl. & Prod. Co.-HoustonNov 15, 1982 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 4,800
- total depth, ft
- 1
- permits on file
- Nov 15, 1982
- last permit issued
- Jan 26, 2009
- completed
- 85.9K
- cumulative oil, bbl
- 8.89K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jan 26, 2009
- Shut in
- Mar 1, 2023
- Plugged
- —
Operator's P-5 on the schedule: Active – Extension (X)
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 31 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Pleasanton, E. (Escondido Unit) O-1-4491 | Pleasanton, E. (Escondido) | Eagle Ford Oil Co., Inc. | 27 | 58.6K | 8.89K | Jan 1993 – Jul 2026 |
| Gossett-Shannon O-1-14694 | Pleasanton, E. (Escondido) | Mazco Energy LLC | 4 | 27.2K | 0 | Mar 2006 – Jul 2026 |
Oil, barrels lease total
Last 12 months 1,066 · prior 12 1,235(-14%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Serra Energy, Inc.Jan 1993 → Oct 2001
- 2Caltex Energy Co.Nov 2001 → May 2006
- 3Rec Well Service, Inc.Nov 2006 → Jul 2008
- 4Rickaway Energy, Corp.Aug 2008 → Dec 2017
- 5Mazco Energy LLCJan 2018 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 177176-99 | Drill | Sun Expl. & Prod. Co.-Houston | Nov 15, 1982 | Nov 15, 1982 | — | 4,900 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jan 26, 2009 | Gossett-Shannon O-1-14694 | Pleasanton E. (Escondido) | Mazco Energy LLC | Shut In · shut in Mar 1, 2023 | 4,800 |
| Sep 24, 1984 | Pleasanton E. (Escondido Unit) O-1-4491 | Pleasanton E. (Escondido) | Eagle Ford Oil Co. Inc. | Not on Schedule | — |
Formation tops
As filed on W-2/G-1. Subsea from 382 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Escondido | 4,663 | -4,281 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,660 | 4,705 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 170 | 12.25 | 125 S |
| 2.875 | 4,511 | — | — |
| 5.5 | 4,797 | 7.875 | 705 S |
| 5.5 | 4,800 | 7.875 | 705 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 | Aug 27, 2009 | Feb 18, 2009 | — |
| 00 | Jun 9, 2006 | Oct 11, 1984 | — |
| 00 | Nov 1, 1984 | Oct 11, 1984 | — |
| 00 | Jan 12, 1984 | Jan 31, 1983 | — |
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 42-013-31691 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-31691 → 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.
Beyond the permit record
RRC UIC permits · H-10 reported volumes
Injection
- 0
- bbl, last 12 reported months
- 217K
- bbl, all reported
- Dec 2011
- reported through
| UIC | Kind | Status | Permitted bbl/d | Max psi | Zone ft |
|---|---|---|---|---|---|
| 000053437 | H-1 Injection | Canceled Jan 19, 2012 | 200 | 2,300 | 4,660–4,705 |
MONTHLY INJECTED, BBL · H-10 · LAST 24 REPORTED MONTHS
Last 12 months 0 · prior 12 0
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/01331691, documented in the API reference.