WELL · 42-479-36503 · DISTRICT 4
Rancho Blanco #28
Webb County · Clark Ranch (Lobo) field · Producing · Vertical
Rancho Blanco #28 (API 42-479-36503) is a well in Webb County operated by Columbus Energy LLC, completed July 26, 1996 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued May 17, 1996, permitted to 8,000 ft.
It was permitted by Zachry Exploration, Inc. and has since transferred to Columbus Energy LLC on the wellbore schedule.
No lease production has been reported under this well’s leases.
Operator of record
Permitted by Zachry Exploration, Inc.; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Jun 2, 2026
- Permits on file
- 51
- Phone
- (832) 432-8540
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Columbus Energy LLC |
| Production reports | Columbus Energy, LLCthrough Apr 2026 |
| Latest permit | Zachry Exploration, Inc.May 17, 1996 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 8,000
- total depth, ft
- 1
- permits on file
- May 17, 1996
- last permit issued
- Jul 26, 1996
- completed
- 0
- cumulative oil, bbl
- 927K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jul 1996 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jul 26, 1996
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active – Extension (X)
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 |
|---|---|---|---|---|---|---|
| Rancho Blanco G-4-160920 | Clark Ranch (Lobo) | Columbus Energy, LLC | 1 | 0 | 927K | Jul 1996 – Jul 2026 |
Gas, mcf lease total
Last 12 months 4,686 · prior 12 6,161(-24%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Zachry Exploration, Inc.Jul 1996 → Nov 2009
- 2Zachry Exploration, Ltd.May 2002 → Jan 2009
- 3Zachry Exploration, LLCDec 2009 → Jul 2010
- 4Columbus Energy, LLCAug 2010 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 448264-99 | Drill | Zachry Exploration, Inc. | May 17, 1996 | May 17, 1996 | Jun 19, 1996 | 8,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-4-160920 | — | — | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,192 | 6,200 | Perforated |
| 6,360 | 6,372 | Perforated |
| 6,377 | 6,380 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 850 | 14.75 | 476 S |
| 2.875 | 6,750 | 6.25 | 410 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. About these reports →
| Suffix | Filed | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Feb 6, 1997 | Aug 9, 1996 | Yes |
| 00 | Jan 2, 1997 | — | — |
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 42-479-36503 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-479-36503 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). then paste it into their search.
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/47936503, documented in the API reference.