TEXAS · WELLS · ZAPATA COUNTY · API 42-505-35624 · DISTRICT 04
Cassin Edward A #4
Zapata County · Las Lomas (Wilcox 7800) field · SWR-10-Well · Directional
Cassin Edward A #4 (API 42-505-35624) is a well in Zapata County operated by Hilcorp Energy Company, completed December 13, 2006 and listed as swr-10-well on the RRC schedule.
The RRC has issued one drilling permit (amended twice), issued June 27, 2006, permitted to 11,810 ft.
It was permitted by Conocophillips Company and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report 3 formation tops, including Perdido, Wilcox, Wills Point.
Its 2 leases have reported 3.07K barrels of oil and 1.23M mcf of gas since November 2006, 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 Conocophillips 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
- 3,458
- 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 | Conocophillips CompanyJun 27, 2006 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 11,810
- total depth, ft
- 3
- permits on file
- Jun 27, 2006
- last permit issued
- Dec 13, 2006
- completed
- 3.07K
- cumulative oil, bbl
- 1.23M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Nov 2006 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 13, 2006
- 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 |
|---|---|---|---|---|---|---|
| Cassin, Edward A G-4-226417 | Cisco-Benavides (Lobo Cons.) | Hilcorp Energy Company | 1 | 658 | 938K | Nov 2006 – Apr 2026 |
| Cassin, Edward A G-4-226466 | Las Lomas (Wilcox 7800) | Hilcorp Energy Company | 1 | 2.41K | 294K | Dec 2006 – Apr 2007 |
Gas, mcf lease total
Last 12 months 12,419 · prior 12 11,876(+5%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Conocophillips CompanyNov 2006 → Dec 2015
- 2Hilcorp Energy CompanyJan 2016 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 621431-97 | Drill | Conocophillips Company | Sep 19, 2006 | Jun 27, 2006 | Aug 5, 2006 | 12,600 |
| 621431-98 | Drill | Conocophillips Company | Jul 10, 2006 | Jun 27, 2006 | — | 12,600 |
| 621431-99 | Drill | Conocophillips Company | Jun 22, 2006 | Jun 27, 2006 | — | 12,600 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Dec 13, 2006 | Cassin Edward A G-4-226466 | Las Lomas (Wilcox 7800) | Hilcorp Energy Company | SWR-10-Well · shut in Apr 1, 2007 | 11,810 |
| Nov 4, 2006 | Cassin Edward A G-4-226417 | Cisco-Benavides (Lobo Cons.) | Hilcorp Energy Company | Producing | 11,810 |
Formation tops
As filed on W-2/G-1. Subsea from 497 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Perdido | 6,714 | -6,217 |
| WilcoxBASE LOWER WILCOX | 9,688 | -9,191 |
| Wills Point | 11,722 | -11,225 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,572 | 7,597 | Perforated |
| 10,587 | 10,771 | Perforated |
| 11,228 | 11,268 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 640 | 17.5 | 689 S |
| 9.625 | 5,083 | 12.25 | 420 S |
| 7 | 7,898 | 8.75 | 290 S |
| 4.5 | 11,903 | 6.25 | 615 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 5, 2007 | Jun 21, 2007 | — |
| 00 | May 18, 2007 | Mar 21, 2007 | Yes |
| 00 | May 4, 2007 | — | — |
| 00 | May 2, 2007 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Sep 17, 2009. 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, Wilcox, Wills Point | TIFF | 5,077 to 11,920 | Sep 17, 2009run Sep 11, 2006 | 12.7 |
"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 42-505-35624 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-35624 → 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/50535624, documented in the API reference.