TEXAS · WELLS · ROBERTSON COUNTY · BIG HORN UNIT LEASE · API 42-395-30557 · DISTRICT 03
Big Horn Unit #1
Robertson County · Giddings (Buda) field · Producing · Horizontal
Big Horn Unit #1 (API 42-395-30557) is a horizontal well in Robertson County operated by Magnolia Oil & Gas Operating LLC, completed March 1, 1998 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued January 29, 1998, permitted to 13,034 ft.
It was permitted by Union Pacific Resources Company and has since transferred to Magnolia Oil & Gas Operating LLC on the wellbore schedule.
Completion filings report 5 formation tops, including Bentonite, False Buda, Buda, Del Rio.
Its lease has reported 290K barrels of oil and 203K mcf of gas since March 1998, last reporting in July 2026.
Operator of record
Magnolia Oil & Gas Operating LLC
Permitted by Union Pacific Resources Company; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- May 6, 2026
- Permits on file
- 615
- Phone
- (713) 842-9050
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Magnolia Oil & Gas Operating LLC |
| Production reports | Magnolia Oil & Gas Operating LLCthrough Apr 2026 |
| Latest permit | Union Pacific Resources CompanyJan 29, 1998 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 13,034
- total depth, ft
- 1
- permits on file
- Jan 29, 1998
- last permit issued
- Mar 1, 1998
- completed
- 290K
- cumulative oil, bbl
- 203K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Mar 1998 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Mar 1, 1998
- 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 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 |
|---|---|---|---|---|---|---|
| Big Horn Unit O-3-23486 | Giddings (Buda) | Magnolia Oil & Gas Operating LLC | 1 | 290K | 203K | Mar 1998 – Jul 2026 |
Oil, barrels lease total
Last 12 months 3,445 · prior 12 4,025(-14%)
Gas, mcf lease total
Last 12 months 2,706 · prior 12 2,302(+18%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Union Pacific Resources CompanyMar 1998 → Jan 2001
- 2Rme Petroleum CompanyFeb 2001 → Oct 2002
- 3Anadarko E&P Company LPDec 2002 → Dec 2012
- 4Anadarko E&P Onshore LLCJan 2013 → Aug 2016
- 5Treadstone Energy Prtnr OP, LLCSep 2016 → Nov 2021
- 6LRR Pecos Valley, LLCDec 2021 → Nov 2023
- 7Magnolia Oil & Gas Operating LLCDec 2023 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 472750-99 | Drill | Union Pacific Resources Company | Jan 29, 1998 | Jan 29, 1998 | Jan 30, 1998 | 7,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Mar 1, 1998 | Big Horn Unit O-3-23486 | Giddings (Buda) | Magnolia Oil & Gas Operating LLC | Producing | 13,034 |
Formation tops
As filed on W-2/G-1. Subsea from 266 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Bentonite | 5,830 | -5,564 |
| False Buda | 6,227 | -5,961 |
| Buda | 6,275 | -6,009 |
| Del Rio | 6,343 | -6,077 |
| Georgetown | 6,380 | -6,114 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 5,715 | 13,034 | Perforated |
| 6,455 | 12,975 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 10.75 | 1,070 | 14.75 | 420 S |
| 7.625 | 6,374 | 9.875 | 850 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 | Jul 2, 1998 | Mar 30, 1998 | Yes |
| 00 | Jun 24, 1998 | — | — |
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 42-395-30557 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-395-30557 → 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/39530557, documented in the API reference.