OPERATORS · TEXAS · P-5 NUMBER 531346

Mas Operating Co.

P-5 status: Active (A)
P-5 last filed: May 11, 2026
Based in: Midland, TX

The same name is registered in New Mexico (0 active wells). Mas Operating Co. across every state →

Mas Operating 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 May 11, 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 NOV 5, 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%: canceled · 0 permits
2: expired undrilled
1: permits a year over 9 active years

Permits issued by month

LAST 60 MONTHS · BY ISSUE DATE

Last 12 months 0 · prior 12 0

Counties

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
Winkler county →	—	6	41	Mar 29, 2016

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
Rustler	2	0
Glorieta	2	0
San Andres	2	0
Queen	2	0
Holt	2	0
Yates	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

Last 12 months 24,245 · prior 12 25,960(-7%)

Beyond the permit record

RRC wellbore file

Wells of record

73: in the wellbore file, 50 on 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

Each count opens the wells it counts. Acquired means the well's permit names a different operator than the schedule does today; wells it permitted that others now run are in its permit history, marked with who runs them now. 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

All 7 permits, with volumes → · On the map →

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 Active (A); Last filed May 11, 2026; Oil operator

Address: PO Box 52167; Midland, TX 79710; (432) 618-0678

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

Full permit history →

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 by the operator that filed them, through the statewide reported-through month; disposal from UIC permits and H-10 reports. Summary figures are rebuilt nightly. Nothing is estimated.

Developers: this page as JSON is GET /v1/data/operators/tx/531346, documented in the API reference.