OPERATORS · RRC 531346 · P-5 STATUS Y
Mas Oper Co
Midland, TX
Watch this operatorMas Oper CO has filed no drilling permits in the past 12 months; its most recent permit was issued March 29, 2016.
The RRC wellbore file lists 73 wells under its operatorship (43 producing, 2 shut in).
Lease reports credit it with 24.2K barrels of oil and 431 mcf of gas in the 12 months reported through April 2026, down 7% on the year before.
It holds 5 active disposal or injection permits, injecting 276K barrels in the 12 months reported through June 2025.
6 drilling permits have been issued to this operator number since 2008; its P-5 organization report was last filed March 4, 2026.
- 0
- permits, last 12 months
- —
- vs prior 12 months (0)
- 0
- counties, 12 months
- 43
- producing wells, of 73 of record
- 12
- 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.
- 67%
- spud rate · 4 of 6 mature permits
- 39
- median days permit to spud · middle half 30–50
- 0
- spuds, last 180 days
- 0%
- cancelled · 0 permits
- 2
- expired undrilled
- 1
- permits a year over 9 active years
Where
Counties by permits in the last 12 months, with all-time permits and current wells of record there.
All 6 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 |
|---|---|---|
| Clear Fork | 3 | 0 |
| Yates | 2 | 0 |
| Holt | 2 | 0 |
| Queen | 2 | 0 |
| San Andres | 2 | 0 |
| Glorieta | 2 | 0 |
| Rustler | 2 | 0 |
| Grayburg | 1 | 0 |
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 →
- 24.2K
- bbl oil, last 12 reported months
- -7%
- vs the 12 months before
- 431
- mcf gas incl. casinghead, last 12
- 1.01M
- bbl oil since reporting began
Oil, barrels
Last 12 months 24,245 · prior 12 25,960(-7%)
Gas, mcf
Last 12 months 431 · prior 12 3,386(-87%)
Beyond the permit record
RRC wellbore file
Wells of record
- 73
- on the schedule
- 43
- producing
- 2
- shut in
- 5
- injection
- 0
- temp. abandoned
- 15
- plugged
How it got them
- 2
- permitted itself
- 5
- acquired from others
- 1
- 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
- 5
- active UIC permits of 7
- 41.5K
- permitted bbl/day, active
- 276K
- bbl injected, last 12 reported months
- Jun 2025
- reported through
By county
| Winkler | 4 active | 41.3K bbl/d |
| Crockett | 1 active | 200 bbl/d |
| Glasscock | 0 active | 0 bbl/d |
| Pecos | 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 | 4 |
| Recompletion | 0 | 0 | 2 |
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 |
|---|---|---|
| Crockett21766001 | 32 | 18 |
| Hendrick40406001 | 15 | 11 |
| Keystone (Colby)49129132 | 12 | 10 |
| Kermit49038001 | 11 | 3 |
| Keystone (Holt)49129396 | 2 | 0 |
| Scarborough81392001 | 1 | 1 |
P-5 organization report
As registered with the RRC. About the P-5 →
- Registration
- Status code Y
- Last filed Mar 4, 2026
- Oil operator
- Address
- PO Box 52167
- Midland, TX 79710
- (432) 349-3846
- Officers and agents
- Brown, Stephen R. · Vice President
- Heiser, Amanda R · Secretary,treasurer
- Heiser, Brantley W · President
Latest permits
NEWEST FIRST BY ISSUE DATE · FILED OR ON WELLS IT NOW OPERATES
| Permit | Seen | Issued | Operator | County | Lease / well | Depth | API |
|---|---|---|---|---|---|---|---|
| 813203 | Mar 29, 2016 | Mar 29, 2016 | Mas Operating Co. | Winkler | Jake #1 | 3,820 | 49533561 |
| 804779 | Mar 27, 2015 | Mar 27, 2015 | Mas Operating Co. | Winkler | Zachary Estate #1 | 5,075 | 49510005 |
| 785700 | May 30, 2014 | May 30, 2014 | Mas Operating Co. | Winkler | Jake #1 | 5,500 | 49533561 |
| 747600 | Sep 12, 2012 | Sep 12, 2012 | Mas Operating Co. | Winkler | L Daugherty B #8 | 3,500 | 49533458 |
| 747600 | Sep 12, 2012 | Sep 12, 2012 | Mas Operating Co. | Winkler | L Daugherty B #8 | 3,500 | 49533458 |
| 655180 | Feb 21, 2008 | Feb 21, 2008 | Mas Operating Co. | Winkler | Zachary Estate #2 | 6,000 | 49533283 |
| 275561 | May 21, 1985 | May 21, 1985 | Texas American Oil Corp. | Winkler | Walton, J. B. -Tract B #2 | 3,487 | 49510079 |
| 191159 | Apr 7, 1983 | Apr 7, 1983 | Azajet Oil Co. | Winkler | Hendrick, T. G. F #5 D | 2,750 | 49503633 |
| 114363 | Apr 8, 1981 | Apr 8, 1981 | HCW Exploration, Inc. | Winkler | Daugherty #1 | 3,350 | 49531339 |
| 19525 | Mar 7, 1978 | Mar 7, 1978 | Houston Domestic Oil Company | Crockett | University "K" #1WS | 800 | 10530779 |
| 19342 | Mar 3, 1978 | Mar 3, 1978 | Houston Domestic Oil Company | Crockett | University "K" #32 | 1,600 | 10531873 |
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/531346, documented in the API reference.