TEXAS · WELLS · ZAPATA COUNTY · API 42-505-35773 · DISTRICT 04
Cassin Edward #9
Zapata County · Las Lomas (Wilcox 7800) field · SWR-10-Well · Directional
Cassin Edward #9 (API 42-505-35773) is a well in Zapata County operated by Hilcorp Energy Company, completed April 28, 2007 and listed as swr-10-well on the RRC schedule.
The RRC has issued one drilling permit (amended twice), issued December 27, 2006, permitted to 12,011 ft.
It was permitted by Conocophillips Company and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report 2 formation tops, including Wilcox, Wills Point.
Its 2 leases have reported 4 barrels of oil and 799K mcf of gas since April 2007, 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 CompanyDec 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.
- 12,011
- total depth, ft
- 3
- permits on file
- Dec 27, 2006
- last permit issued
- Apr 28, 2007
- completed
- 4
- cumulative oil, bbl
- 799K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 2007 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Apr 28, 2007
- 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 G-4-229334 | Cisco-Benavides (Lobo Cons.) | Hilcorp Energy Company | 1 | 4 | 728K | Apr 2007 – Apr 2026 |
| Cassin, Edward G-4-229340 | Las Lomas (Wilcox 7800) | Hilcorp Energy Company | 1 | 0 | 71.1K | Apr 2007 – Jun 2007 |
Gas, mcf lease total
Last 12 months 3,835 · prior 12 5,911(-35%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Conocophillips CompanyApr 2007 → Dec 2015
- 2Hilcorp Energy CompanyJan 2016 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 631010-97 | Drill | Conocophillips Company | May 3, 2007 | Dec 27, 2006 | Feb 12, 2007 | 12,600 |
| 631010-98 | Drill | Conocophillips Company | Dec 28, 2006 | Dec 27, 2006 | — | 12,600 |
| 631010-99 | Drill | Conocophillips Company | Dec 21, 2006 | Dec 27, 2006 | — | 12,600 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Apr 28, 2007 | Cassin Edward G-4-229340 | Las Lomas (Wilcox 7800) | Hilcorp Energy Company | SWR-10-Well · shut in Jun 1, 2007 | 12,011 |
| Apr 2, 2007 | Cassin Edward G-4-229334 | Cisco-Benavides (Lobo Cons.) | Hilcorp Energy Company | Producing | 12,011 |
Formation tops
As filed on W-2/G-1. Subsea from 468 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| WilcoxBASE LOWER WILCOX | 9,976 | -9,508 |
| Wills Point | 10,612 | -10,144 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 8,056 | 8,072 | Perforated |
| 10,265 | 10,510 | Perforated |
| 11,278 | 11,362 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 690 | 17.5 | 640 S |
| 9.625 | 6,365 | 12.25 | 420 S |
| 7 | 8,315 | 8.75 | 250 S |
| 4.5 | 12,003 | 6.25 | 445 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 | Nov 15, 2007 | Oct 10, 2007 | — |
| 00 | Sep 13, 2007 | Jun 25, 2007 | Yes |
| 00 | Sep 12, 2007 | Jun 15, 2007 | Yes |
| 00 | Sep 10, 2007 | — | — |
| 00 | Sep 7, 2007 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Sep 10, 2008. 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 Wilcox, Wills Point | TIFF | 8,776 to 12,028 | Sep 10, 2008run Mar 4, 2007 | 2.48 |
"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 42-505-35773 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-35773 → 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/50535773, documented in the API reference.