TEXAS · WELLS · ZAPATA COUNTY · MENDOZA LEASE · API 42-505-35010 · DISTRICT 04
Mendoza #4
Zapata County · Exsun (Lobo Cons.) field · Producing · Vertical
Mendoza #4 (API 42-505-35010) is a well in Zapata County operated by Hilcorp Energy Company, completed July 7, 2004 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued May 24, 2004, permitted to 10,700 ft.
It was permitted by Laredo Energy and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report 3 formation tops, including T/Lobo Uncon, T/Midway Shale, T/Cretaceous.
Its lease has reported 1.65K barrels of oil and 1.5M mcf of gas since July 2004, last reporting volume in April 2026.
Operator of record
Permitted by Laredo Energy; 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
- 3,458
- 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 | Laredo EnergyMay 24, 2004 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,700
- total depth, ft
- 1
- permits on file
- May 24, 2004
- last permit issued
- Jul 7, 2004
- completed
- 1.65K
- cumulative oil, bbl
- 1.5M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jul 2004 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jul 7, 2004
- 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 |
|---|---|---|---|---|---|---|
| Mendoza G-4-202838 | Exsun (Lobo Cons.) | Hilcorp Energy Company | 1 | 1.65K | 1.5M | Jul 2004 – Apr 2026 |
Gas, mcf lease total
Last 12 months 26,717 · prior 12 26,275(+2%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Laredo EnergyJul 2004 → Mar 2005
- 2Chesapeake Operating, Inc.Apr 2005 → Aug 2014
- 3Hilcorp Energy CompanySep 2014 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 546051-99 | Drill | Laredo Energy | May 24, 2004 | May 24, 2004 | Jun 6, 2004 | 11,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jul 7, 2004 | Mendoza G-4-202838 | Exsun (Lobo Cons.) | Hilcorp Energy Company | Producing | 10,700 |
Formation tops
As filed on W-2/G-1. Subsea from 472 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| T/Lobo Uncon | 8,225 | -7,753 |
| T/Midway Shale | 10,330 | -9,858 |
| T/Cretaceous | 10,555 | -10,083 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,368 | 8,406 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 760 | 12.25 | 300 S |
| 7 | 6,931 | 8.75 | 324 S |
| 4.5 | 10,697 | 6.125 | 330 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 28, 2004 | Aug 9, 2004 | Yes |
| 00 | Aug 19, 2004 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Nov 19, 2007. Resistivity. 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 |
|---|---|---|---|---|
| ResistivityONE INCH CORRELATIONSpans T/Lobo Uncon, T/Midway Shale, T/Cretaceous | TIFF | 6,936 to 10,704 | Nov 19, 2007run Jun 20, 2004 | — |
"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 42-505-35010 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-35010 → 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/50535010, documented in the API reference.