OPERATORS · RRC 876520 · P-5 STATUS Y
Union Oil Co of California
Midland, TX
Watch this operatorUnion Oil CO Of California has filed no drilling permits in the past 12 months; its most recent permit was issued June 26, 2019.
The RRC wellbore file lists 619 wells under its operatorship.
2,336 drilling permits have been issued to this operator number since 1977; its P-5 organization report was last filed September 2, 2022.
- 0
- permits, last 12 months
- —
- vs prior 12 months (0)
- 0
- counties, 12 months
- 0
- producing wells, of 619 of record
- 307
- leases it reports
- —
- horizontal, 12 months
WINDOWS ON THE RRC ISSUE DATE · COMPUTED OCT 29, 2026
From permit to spud
FROM THE DATES ON ITS W-1 PERMITS · ALL TIME
A permit is a plan, not a well. These figures count only permits old enough to have spudded, six months and more, and read the spud, cancel, and expiry dates the RRC records on each one.
- 64%
- spud rate · 1,491 of 2,336 mature permits
- 30
- median days permit to spud · middle half 12–65
- 0
- spuds, last 180 days
- 0%
- cancelled · 4 permits
- 840
- expired undrilled
- 54
- permits a year over 43 active years
Where
Counties by permits in the last 12 months, with all-time permits and current wells of record there.
| County | 12 mo | All time | Wells | Last |
|---|---|---|---|---|
| Andrews county → | — | 640 | 89 | Mar 16, 2000 |
| Van Zandt county → | — | 413 | 250 | Jun 26, 2019 |
| Gaines county → | — | 301 | 26 | May 22, 2000 |
| Ector county → | — | 170 | 14 | Dec 30, 1999 |
| Borden county → | — | 83 | 15 | Aug 26, 1999 |
| Duval county → | — | 79 | 0 | Oct 29, 1981 |
| Jackson county → | — | 73 | 18 | May 14, 1998 |
| Crockett county → | — | 70 | 1 | Feb 25, 1999 |
| Hockley county → | — | 55 | 13 | Apr 11, 1996 |
| Cochran county → | — | 42 | 27 | Jul 13, 1994 |
| Howard county → | — | 34 | 1 | Sep 17, 1998 |
| Pecos county → | — | 33 | 7 | May 2, 2000 |
| Orange county → | — | 21 | 1 | Jan 15, 1998 |
| Reeves county → | — | 21 | 3 | Feb 18, 2000 |
| Montague county → | — | 18 | 4 | Oct 29, 1992 |
| Garza county → | — | 16 | 2 | Jan 12, 1996 |
| Liberty county → | — | 15 | 0 | Jun 18, 1997 |
| Sterling county → | — | 15 | 0 | Jan 26, 1993 |
| Ochiltree county → | — | 13 | 9 | Nov 3, 1992 |
| Hemphill county → | — | 11 | 1 | Sep 13, 1995 |
| Matagorda county → | — | 11 | 2 | Apr 7, 1998 |
| Mustang IS-LB county → | — | 11 | 0 | Mar 14, 2003 |
| Winkler county → | — | 11 | 17 | May 25, 2000 |
| Panola county → | — | 10 | 1 | Jun 15, 1981 |
| Reagan county → | — | 10 | 1 | Nov 30, 1992 |
| Scurry county → | — | 10 | 1 | Sep 28, 1990 |
| Crane county → | — | 9 | 5 | Jul 12, 1993 |
| Brewster county → | — | 8 | 0 | Feb 11, 1991 |
| Henderson county → | — | 8 | 2 | Nov 15, 2002 |
| Lubbock county → | — | 8 | 10 | Nov 21, 1983 |
| Freestone county → | — | 6 | 3 | Mar 7, 2002 |
| Lipscomb county → | — | 6 | 2 | Aug 1, 1991 |
| Wharton county → | — | 6 | 9 | Jul 16, 1997 |
| Brazoria county → | — | 5 | 2 | Nov 16, 1982 |
| Galveston county → | — | 5 | 7 | Jan 31, 1985 |
| Mustang IS-SB county → | — | 5 | 0 | Mar 1, 2002 |
| Roberts county → | — | 5 | 3 | Apr 9, 1986 |
| Terry county → | — | 5 | 0 | Mar 18, 1992 |
| Val Verde county → | — | 5 | 0 | Oct 17, 1995 |
| Wood county → | — | 5 | 0 | Jul 7, 1993 |
| Bee county → | — | 4 | 6 | Sep 17, 1979 |
| Fayette county → | — | 4 | 0 | Feb 8, 1982 |
| Hale county → | — | 4 | 0 | Jan 6, 1984 |
| High IS-LB county → | — | 4 | 0 | May 16, 1983 |
| Houston county → | — | 3 | 4 | May 25, 1983 |
| Madison county → | — | 3 | 4 | Apr 22, 1985 |
| Matgrda IS-SB county → | — | 3 | 1 | Jun 6, 1980 |
| Polk county → | — | 3 | 0 | Jul 12, 1984 |
| Upshur county → | — | 3 | 0 | Apr 10, 2002 |
| Brazos-LB county → | — | 2 | 0 | Feb 15, 1999 |
| Kenedy county → | — | 2 | 0 | Jan 21, 1986 |
| LA Salle county → | — | 2 | 0 | Jul 28, 1983 |
| Leon county → | — | 2 | 0 | Feb 27, 1985 |
| Terrell county → | — | 2 | 0 | Feb 17, 1981 |
| Upton county → | — | 2 | 0 | Sep 11, 1979 |
| Ward county → | — | 2 | 6 | Jul 8, 1980 |
| Austin county → | — | 1 | 0 | Jun 24, 1980 |
| Bastrop county → | — | 1 | 0 | Jul 18, 1977 |
| Calhoun county → | — | 1 | 1 | Jun 5, 2001 |
| Chambers county → | — | 1 | 3 | Dec 12, 2002 |
| Concho county → | — | 1 | 0 | Jul 18, 1978 |
| Dawson county → | — | 1 | 0 | Nov 23, 1987 |
| Galveston-LB county → | — | 1 | 0 | Jul 3, 1979 |
| Hansford county → | — | 1 | 0 | Mar 19, 1991 |
| Hardin county → | — | 1 | 0 | Aug 21, 1995 |
| Irion county → | — | 1 | 0 | Nov 29, 1979 |
| Jefferson county → | — | 1 | 3 | Apr 20, 1994 |
| Midland county → | — | 1 | 5 | Jul 28, 1978 |
| Newton county → | — | 1 | 0 | May 26, 1994 |
| Presidio county → | — | 1 | 0 | Dec 5, 1980 |
| Rains county → | — | 1 | 1 | May 18, 1993 |
| San Augustine county → | — | 1 | 0 | Sep 28, 1984 |
| S Padre IS-LB county → | — | 1 | 0 | Sep 18, 1980 |
| Sutton county → | — | 1 | 2 | Nov 6, 1987 |
| Webb county → | — | 1 | 0 | Aug 23, 1977 |
All 2,336 permits, searchable → · Leases it reports → · On the map →
Formations in its completed wells
Tops reported on completion filings for wells it operates. RRC wellbore file. About tops →
| Formation | Wells | Permitted last 3 yrs |
|---|---|---|
| Yates | 627 | 1 |
| Clear Fork | 533 | 0 |
| San Andres | 513 | 0 |
| Glorieta | 401 | 0 |
| Rustler | 300 | 1 |
| Wolfcamp | 235 | 1 |
| Queen | 212 | 0 |
| Grayburg | 207 | 0 |
| Austin Chalk | 186 | 7 |
| Tubb | 182 | 0 |
| Pennsylvanian | 162 | 1 |
| Pecan Gap | 155 | 7 |
| Devonian | 139 | 0 |
| Canyon | 138 | 0 |
| Strawn | 133 | 1 |
Production by month
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Barrels on leases where this operator filed the production report. Lease-level by design; the latest months are revised upward as late reports arrive. How production is reported →
- 0
- bbl oil, last 12 reported months
- —
- vs the 12 months before
- 0
- mcf gas incl. casinghead, last 12
- 79M
- bbl oil since reporting began
No lease production reported under this operator number in the last three years.
Beyond the permit record
RRC wellbore file
Wells of record
- 619
- on the schedule
- 0
- producing
- 0
- shut in
- 0
- injection
- 0
- temp. abandoned
- 331
- plugged
How it got them
- 161
- permitted itself
- 58
- acquired from others
- 1,330
- permitted, now run by others
Acquired means the well's permit names a different operator than the schedule does today. Transfers and operator numbers →
RRC UIC permits · H-10 reported volumes
Disposal and injection
- 0
- active UIC permits of 318
- 0
- permitted bbl/day, active
- 0
- bbl injected, last 12 reported months
- Jun 2025
- reported through
By county
| Andrews | 0 active | 0 bbl/d |
| Van Zandt | 0 active | 0 bbl/d |
| Ector | 0 active | 0 bbl/d |
| Gaines | 0 active | 0 bbl/d |
| Hockley | 0 active | 0 bbl/d |
| Garza | 0 active | 0 bbl/d |
| Howard | 0 active | 0 bbl/d |
| Borden | 0 active | 0 bbl/d |
Permitted volume is a ceiling, not throughput. How to read it →
Permit types
Last 12 months against the prior 12, and all time. A type opens the permit history filtered to it. What the types mean →
| Type | 12 mo | Prior 12 | All time |
|---|---|---|---|
| Drill | 0 | 0 | 1,736 |
| Recompletion | 0 | 0 | 527 |
| Other | 0 | 0 | 41 |
| Reenter | 0 | 0 | 16 |
| Field transfer | 0 | 0 | 11 |
| Reclass | 0 | 0 | 5 |
Fields
RRC regulatory fields with the most wells of record under this operator. The field opens its page; the count opens this operator's wells in it.
| Field | Wells | Producing |
|---|---|---|
| Van93042001 | 119 | 0 |
| Van (Austin Chalk)93042166 | 45 | 0 |
| Van (Shallow)93042498 | 30 | 0 |
| Riley North76707001 | 24 | 0 |
| Van (Pecan Gap)93042390 | 22 | 0 |
| Levelland53411001 | 21 | 0 |
| Fuhrman-Mascho33176001 | 15 | 0 |
| Reinecke75780001 | 13 | 0 |
| Andrews (Wolfcamp)2725750 | 13 | 0 |
| Spraberry (Trend Area)85280300 | 12 | 0 |
| Andrews (Wolfcamp-Penn.)2725760 | 12 | 0 |
| Smyer84345001 | 12 | 0 |
P-5 organization report
As registered with the RRC. About the P-5 →
- Registration
- Status code Y
- Last filed Sep 2, 2022
- Address
- 6301 Deauville Blvd
- Midland, TX 79706
- (800) 231-0623
- Officers and agents
- Corporate Service Company · Texas Resident Agent
- Gustavson, Jeffrey Brix · President
- Hatfield, Mark Gregory · Vice President
- Reilly, Marguerite Teresa · Treasurer
Latest permits
NEWEST FIRST BY ISSUE DATE · FILED OR ON WELLS IT NOW OPERATES
About this data
Registration from the RRC P-5 organization report, refreshed weekly. Permits from the OGA049M master and daily daf420 files; wells of record from the EWA wellbore schedule; production from PDQ lease reports at the last vintage; disposal from UIC permits and H-10 reports. Summary figures are rebuilt nightly.
Developers: this page as JSON is GET /v1/data/operators/tx/876520, documented in the API reference.