TEXAS · WELLS · ZAPATA COUNTY · ALFONSO LEASE · API 42-505-35937 · DISTRICT 04
Alfonso #40
Zapata County · Charco (9900) field · Producing · Vertical
Alfonso #40 (API 42-505-35937) is a well in Zapata County operated by Hilcorp Energy Company, completed January 6, 2008 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued August 28, 2007, permitted to 10,400 ft.
It was permitted by Forest Oil Corporation and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report 5 formation tops, including Perdido Unconformity, Top Perdido A, Base Perdido A, Base Perdido B.
Its lease has reported 956 barrels of oil and 1.09M mcf of gas since September 2007, last reporting volume in April 2026.
Operator of record
Permitted by Forest Oil Corporation; 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 | Forest Oil CorporationAug 28, 2007 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,400
- total depth, ft
- 1
- permits on file
- Aug 28, 2007
- last permit issued
- Jan 6, 2008
- completed
- 956
- cumulative oil, bbl
- 1.09M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Oct 2007 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jan 6, 2008
- 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 |
|---|---|---|---|---|---|---|
| Alfonso G-4-231987 | Charco (9900) | Hilcorp Energy Company | 1 | 956 | 1.09M | Sep 2007 – Apr 2026 |
Gas, mcf lease total
Last 12 months 15,193 · prior 12 15,726(-3%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Forest Oil CorporationOct 2007 → Dec 2012
- 2Hilcorp Energy CompanyJan 2013 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 643063-99 | Drill | Forest Oil Corporation | Jul 23, 2007 | Aug 28, 2007 | Sep 10, 2007 | 10,900 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jan 6, 2008 | Alfonso G-4-231987 | Charco (9900) | Hilcorp Energy Company | Producing | 10,400 |
Formation tops
As filed on W-2/G-1. Subsea from 433 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Perdido Unconformity | 9,272 | -8,839 |
| Top Perdido A | 9,292 | -8,859 |
| Base Perdido A | 9,580 | -9,147 |
| Base Perdido B | 9,580 | -9,147 |
| Top Perdido B | 10,018 | -9,585 |
| Base Perdido B | 10,341 | -9,908 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,022 | 10,029 | Perforated |
| 10,022 | 10,194 | Perforated |
| 10,033 | 10,038 | Perforated |
| 10,044 | 10,051 | Perforated |
| 10,054 | 10,061 | Perforated |
| 10,067 | 10,194 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 767 | 12.25 | 350 S |
| 7 | 8,852 | 8.75 | 400 S |
| 3.5 | 10,391 | 6.125 | 250 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 | May 15, 2008 | Feb 8, 2008 | — |
| 00 | Jan 11, 2008 | Oct 26, 2007 | Yes |
| 00 | Jan 4, 2008 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Dec 10, 2010. 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 |
|---|---|---|---|---|
| RESISTIVITYSpans Perdido Unconformity, Top Perdido A, Base Perdido A, Base Perdido B, Top Perdido B | TIFF | 8,846 to 10,397 | Dec 10, 2010run Sep 24, 2007 | 0.19 |
"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 42-505-35937 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-35937 → 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/50535937, documented in the API reference.