TEXAS · WELLS · ZAPATA COUNTY · MARSHALL, S. G. LEASE · API 42-505-33947 · DISTRICT 04
Marshall S. G. #21
Zapata County · Cisco-Benavides (Lobo Cons.) field · Temp Abandoned · Vertical
Marshall S. G. #21 (API 42-505-33947) is a well in Zapata County operated by Hilcorp Energy Company, completed July 3, 1999 and listed as temp abandoned on the RRC schedule, shut in May 1, 2019.
The RRC has issued one drilling permit, issued May 21, 1999, permitted to 9,600 ft.
It was permitted by Chevron U. S. A. Inc. and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report one formation top, including Lobo Unconformity.
Its lease has reported 7 barrels of oil and 3.91M mcf of gas since July 1999, with no volume in the three years through August 2026.
Operator of record
Permitted by Chevron U. S. A. Inc.; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Mar 27, 2026
- Permits on file
- 3,459
- Phone
- (713) 209-2400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Hilcorp Energy Company |
| Production reports | Hilcorp Energy Companythrough Apr 2019 |
| Latest permit | Chevron U. S. A. Inc.May 21, 1999 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,600
- total depth, ft
- 1
- permits on file
- May 21, 1999
- last permit issued
- Jul 3, 1999
- completed
- 7
- cumulative oil, bbl
- 3.91M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · JUL 1999 THROUGH APR 2019
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jul 3, 1999
- Shut in
- May 1, 2019
- 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.
Wells nearby
Every well with a location on file around this well, in any state, nearest first.
Texas locations come from drilling permits, so most older Texas wells have none and are not listed.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH AUG 2026
Texas reports oil by lease, not by well. These are the lease this well is completed on; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Marshall, S. G. G-4-174091 | Cisco-Benavides (Lobo Cons.) | Hilcorp Energy Company | 1 | 7 | 3.91M | Jul 1999 – Apr 2019 |
No volumes reported on these leases in the last three years.
Wells named Marshall S. G.
Hilcorp Energy Company's other wells filed under this lease name in Zapata County, newest permit first. The RRC gives a gas well its own lease number, so the name is what joins the wells of a unit.
Loading the lease's wellsChain of custody
Operator on the lease's P-4
Each operator named on the P-4 filings for this well's lease (a gas well is its own lease), from the date its filing took effect. The P-4 is filed by lease, so a date before the well was drilled is the lease's.
| Operator | From | To |
|---|---|---|
| Hilcorp Energy Company | Sep 1, 2014 | today |
| Chevron U. S. A. Inc. | Jul 3, 1999 | Sep 1, 2014 |
Reporting production
Every operator that reported production on this well's lease, in order.
- 1Chevron U. S. A. Inc.Jul 1999 → Aug 2014
- 2Hilcorp Energy CompanySep 2014 → Apr 2019
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 484701-99 | Drill | Chevron U. S. A. Inc. | May 21, 1999 | May 21, 1999 | Jun 4, 1999 | 10,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jul 3, 1999 | Marshall S. G. G-4-174091 | Cisco-Benavides (Lobo Cons.) | Hilcorp Energy Company | Temp Abandoned · shut in May 1, 2019 | 9,600 |
Formation tops
As filed on W-2/G-1. Subsea from 400 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Lobo Unconformity | 8,950 | -8,550 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,150 | 9,155 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 1,103 | 12.25 | 430 S |
| 7 | 7,431 | 8.75 | 275 S |
| 2.875 | 9,554 | 6.125 | 460 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. 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 | Sep 27, 1999 | Aug 25, 1999 | Yes |
| 00 | Sep 13, 1999 | — | — |
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 42-505-33947 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-33947 → 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/50533947, documented in the API reference.