TEXAS · WELLS · WEBB COUNTY · HIRSCH ESTATE 517 LEASE · API 42-479-35203 · DISTRICT 04
Hirsch Estate 517 #4
Webb County · Big Cowboy (Lobo) field · Producing · Vertical
Hirsch Estate 517 #4 (API 42-479-35203) is a well in Webb County operated by Hilcorp Energy Company, completed May 1, 1991 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued March 26, 1991, permitted to 8,500 ft.
It was permitted by Enron Oil & Gas Company and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report 2 formation tops, including Wilcox, Lobo.
Its lease has reported 15.3K barrels of oil and 1.45M mcf of gas since January 1993, last reporting volume in April 2026.
Operator of record
Permitted by Enron Oil & Gas Company; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Mar 27, 2026
- Permits on file
- 3,454
- 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 2026 |
| Latest permit | Enron Oil & Gas CompanyMar 26, 1991 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,500
- total depth, ft
- 1
- permits on file
- Mar 26, 1991
- last permit issued
- May 1, 1991
- completed
- 15.3K
- cumulative oil, bbl
- 1.45M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- May 1, 1991
- Shut in
- —
- 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 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 |
|---|---|---|---|---|---|---|
| Hirsch Estate 517 G-4-138518 | Big Cowboy (Lobo) | Hilcorp Energy Company | 1 | 15.3K | 1.45M | Jan 1993 – Apr 2026 |
Gas, mcf lease total
Last 12 months 8,777 · prior 12 12,641(-31%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Enron Oil & Gas CompanyJan 1993 → May 1995
- 2Conoco Inc.Jun 1995 → Dec 2002
- 3Conocophillips CompanyJan 2003 → Feb 2008
- 4Hilcorp Energy CompanyJun 2020 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 386018-99 | Drill | Enron Oil & Gas Company | Mar 22, 1991 | Mar 26, 1991 | Apr 3, 1991 | 9,300 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| May 1, 1991 | Hirsch Estate 517 G-4-138518 | Big Cowboy (Lobo) | Hilcorp Energy Company | Producing | 8,500 |
Formation tops
As filed on W-2/G-1. Subsea from 469 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Wilcox | 4,495 | -4,026 |
| Lobo | 7,354 | -6,885 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,521 | 7,560 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 963 | 12.25 | 360 S |
| 7 | 6,945 | 8.75 | 1,083 S |
| 2.875 | 8,494 | 6.25 | 300 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 | Jul 16, 1991 | May 31, 1991 | — |
| 00 | Jul 5, 1991 | — | Yes |
Well logs
1 log loaded from the RRC's log index, the latest received Aug 22, 2008. Resistivity, Sonic. These are the logs loaded into Petrora from the Railroad Commission's inventories, not necessarily every log run on the well. The RRC holds the files; each opens from its log search for the well. The kind is the RRC's description of the log; the interval is the one filed for it.
Open the RRC's log search for this well ↗| Logas described | Files | Intervalft, as filed | Datereceived | SizeMB |
|---|---|---|---|---|
| COMBINATION: RESISTIVITY/ACOUSTIC POROSITYSpans Wilcox, Lobo | TIFF | 963 to 8,501 | Aug 22, 2008run Apr 14, 1991 | 2.87 |
"Spans" is by this well's own filed formation tops: a formation runs from its top to the next deeper top filed, and the deepest runs to the bottom of the log. Depths are measured along the wellbore, so on a horizontal the lateral counts in the formation it was landed in.
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 42-479-35203 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-479-35203 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search 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/47935203, documented in the API reference.