TEXAS · WELLS · ZAPATA COUNTY · API 42-505-34371 · DISTRICT 04
Alfonso #20
Zapata County · Charco (9900) field · Producing · Vertical
Alfonso #20 (API 42-505-34371) is a well in Zapata County operated by Hilcorp Energy Company, completed January 14, 2002 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit (amended once), issued June 18, 2001, permitted to 10,260 ft.
It was permitted by Houston Exploration Company, The and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Its 2 leases have reported 946 barrels of oil and 842K mcf of gas since December 2001, last reporting volume in April 2026. The leases carry 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Houston Exploration Company, The; 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 | Houston Exploration Company, TheJun 18, 2001 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,260
- total depth, ft
- 2
- permits on file
- Jun 18, 2001
- last permit issued
- Jan 14, 2002
- completed
- 946
- cumulative oil, bbl
- 842K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Dec 2001 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jan 14, 2002
- 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 2 leases this well is completed on; they carry 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Alfonso G-4-189556 | Charco (9900) | Hilcorp Energy Company | 1 | 946 | 842K | Dec 2001 – Apr 2026 |
| Alfonso G-4-189743 | Charco (9200) | Hilcorp Energy Company | 1 | 0 | 0 | Jan 2002 – — |
Gas, mcf lease total
Last 12 months 3,705 · prior 12 3,895(-5%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Houston Exploration Company, TheDec 2001 → Jun 2007
- 2Forest Oil CorporationJul 2007 → Dec 2012
- 3Hilcorp Energy CompanyJan 2013 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 510430-97 | Drill | Houston Exploration Company, The | Apr 26, 2002 | Jun 18, 2001 | — | 10,260 |
| 510430-99 | Drill | Houston Exploration Company, The | Jun 18, 2001 | Jun 18, 2001 | Dec 1, 2001 | 10,320 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jan 14, 2002 | Alfonso G-4-189556 | Charco (9900) | Hilcorp Energy Company | Producing | 10,260 |
| Jan 5, 2002 | Alfonso G-4-189743 | Charco (9200) | Hilcorp Energy Company | SWR-10-Well · shut in Mar 1, 2002 | 10,260 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,035 | 9,048 | Perforated |
| 9,943 | 9,951 | Perforated |
| 9,965 | 9,975 | Perforated |
| 9,981 | 9,991 | Perforated |
| 9,999 | 10,008 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 16 | 60 | 17.75 | 85 S |
| 10.75 | 760 | 14.75 | 545 S |
| 7 | 8,432 | 8.75 | 440 S |
| 2.875 | 10,224 | 6.25 | 350 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 | Aug 29, 2002 | Mar 21, 2002 | Yes |
| 00 | Aug 20, 2002 | Mar 21, 2002 | Yes |
| 00 | Aug 7, 2002 | — | — |
| 00 | Jul 30, 2002 | — | — |
Well logs
The RRC's map lists this well among those with logs online. Its monthly inventories loaded here, which start in July 2006, list none for it, so none are itemized.
Open the RRC's log search for this well ↗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 42-505-34371 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-34371 → 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/50534371, documented in the API reference.