TEXAS · WELLS · ZAPATA COUNTY · API 42-505-35072 · DISTRICT 04
Leonardo #39
Zapata County · Charco (9900) field · Producing · Vertical
Leonardo #39 (API 42-505-35072) is a well in Zapata County operated by Hilcorp Energy Company, completed November 8, 2004 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued August 10, 2004, permitted to 12,816 ft.
It was permitted by Houston Exploration Company, The and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report 4 formation tops, including Perdido Unconformity, Top Perdido A, Top Perdido B, Lobo Unconformity.
Its 2 leases have reported 3.51K barrels of oil and 1.92M mcf of gas since September 2004, 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, TheAug 10, 2004 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,816
- total depth, ft
- 1
- permits on file
- Aug 10, 2004
- last permit issued
- Nov 8, 2004
- completed
- 3.51K
- cumulative oil, bbl
- 1.92M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Sep 2004 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 8, 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 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 |
|---|---|---|---|---|---|---|
| Leonardo G-4-204423 | Charco (9900) | Hilcorp Energy Company | 1 | 3.51K | 1.92M | Sep 2004 – Apr 2026 |
| Leonardo G-4-204753 | Charco (9400) | Hilcorp Energy Company | 1 | 0 | 0 | Oct 2004 – — |
Gas, mcf lease total
Last 12 months 7,830 · prior 12 7,891(-1%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Houston Exploration Company, TheSep 2004 → Jun 2007
- 2Forest Oil CorporationJul 2007 → Dec 2012
- 3Hilcorp Energy CompanyJan 2013 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 549322-99 | Drill | Houston Exploration Company, The | Aug 9, 2004 | Aug 10, 2004 | Aug 28, 2004 | 13,700 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Nov 8, 2004 | Leonardo G-4-204423 | Charco (9900) | Hilcorp Energy Company | Producing | 12,816 |
| Oct 7, 2004 | Leonardo G-4-204753 | Charco (9400) | Hilcorp Energy Company | SWR-10-Well · shut in Oct 1, 2004 | 12,816 |
Formation tops
As filed on W-2/G-1. Subsea from 376 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Perdido Unconformity | 9,395 | -9,019 |
| Top Perdido A | 9,421 | -9,045 |
| Top Perdido B | 10,232 | -9,856 |
| Lobo Unconformity | 11,326 | -10,950 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,470 | 9,474 | Perforated |
| 9,470 | 10,388 | Perforated |
| 9,556 | 9,586 | Perforated |
| 9,608 | 9,613 | Perforated |
| 10,248 | 10,257 | Perforated |
| 10,297 | 10,301 | Perforated |
| 10,304 | 10,308 | Perforated |
| 10,368 | 10,372 | Perforated |
| 10,377 | 10,380 | Perforated |
| 10,384 | 10,388 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 16 | 62 | 17.75 | 100 S |
| 10.75 | 753 | 14.75 | 530 S |
| 7.625 | 8,795 | 9.875 | 400 S |
| 7 | 8,795 | 9.875 | 400 S |
| 4.5 | 10,623 | 6.75 | 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 | Mar 16, 2005 | Dec 9, 2004 | — |
| 00 | Mar 2, 2005 | Oct 29, 2004 | Yes |
| 00 | Feb 16, 2005 | Oct 25, 2004 | Yes |
| 00 | Dec 22, 2004 | — | — |
| 00 | Dec 3, 2004 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Feb 8, 2008. Density, Gamma ray, Neutron, 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 |
|---|---|---|---|---|
| Combination: Resistivity/Neutron Density PorosityARRAY INDUCTION GAMMA RAY COMPENSATED NEUTRON LITHODENSITY TRIPLE COMBOSpans Perdido Unconformity, Top Perdido A, Top Perdido B, Lobo Unconformity | TIFF | 8,796 to 12,300 | Feb 8, 2008run Sep 23, 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 42-505-35072 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-35072 → 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/50535072, documented in the API reference.