OPERATORS · RRC 139586 · P-5 STATUS Y

Cass Oil Co

Dallas, TX

Cass Oil CO has filed no drilling permits in the past 12 months; its most recent permit was issued January 9, 1991.

The RRC wellbore file lists 20 wells under its operatorship.

162 drilling permits have been issued to this operator number since 1981; its P-5 organization report was last filed May 15, 1991.

0: permits, last 12 months
—: vs prior 12 months (0)
0: counties, 12 months
0: producing wells, of 20 of record
0: 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.

32%: spud rate · 52 of 162 mature permits
20: median days permit to spud · middle half 8–72
0: spuds, last 180 days
0%: cancelled · 0 permits
110: expired undrilled
16: permits a year over 10 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
Reagan county →	—	74	4	Jan 9, 1989
Sutton county →	—	45	14	Apr 30, 1984
Irion county →	—	29	1	Jan 9, 1991
Concho county →	—	3	0	Nov 26, 1990
Upton county →	—	3	0	Jun 18, 1985
Glasscock county →	—	2	0	Jan 25, 1985
Mitchell county →	—	2	1	May 31, 1988
Crane county →	—	1	0	Mar 23, 1990
Howard county →	—	1	0	Jan 26, 1988
Midland county →	—	1	0	Apr 22, 1985
Tom Green county →	—	1	0	Feb 17, 1989

All 162 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
Spraberry	55	0
Dean	39	0
Canyon	28	0
Clear Fork	11	0
Wolfcamp	7	0
San Angelo	7	0
Cisco	4	0
Base Cretaceous (marker)	2	0
Santa Rosa	1	0
Strawn	1	0
Ellenburger	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 →

0: bbl oil, last 12 reported months
—: vs the 12 months before
0: mcf gas incl. casinghead, last 12
0: 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

20: on the schedule
0: producing
0: shut in
0: injection
0: temp. abandoned
20: plugged

How it got them

11: permitted itself
6: acquired from others
106: permitted, now run by others

Acquired means the well's permit names a different operator than the schedule does today. Transfers and operator numbers →

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	159
Recompletion	0	0	3

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
Sawyer (Canyon)81267333	12	0
Calvin (Dean)14937333	3	0
Phyllis Sonora (Canyon Lower)71285300	1	0
Brooks (Canyon K)12244075	1	0
Spraberry (Trend Area)85279200	1	0
Steen (Wolfcamp)85822500	1	0
Westbrook (Ellenburger)96563525	1	0

P-5 organization report

As registered with the RRC. About the P-5 →

Registration: Status code Y; Last filed May 15, 1991

Address: 5950 Berkshire LN Ste 530; Dallas, TX 75225

Officers and agents: Cass, Frank W. · President; Cass, William G. · Vice President

Latest permits

NEWEST FIRST BY ISSUE DATE · FILED OR ON WELLS IT NOW OPERATES

Permit	Seen	Issued	Operator	County	Lease / well	Depth	API
383256	Jan 9, 1991	Jan 9, 1991	Cass Oil Company	Irion	Hoyt, Joan Crews #18	6,700	23532975
381104	Nov 26, 1990	Nov 26, 1990	Cass Oil Company	Concho	Price #1	3,600	09531229
381089	Nov 19, 1990	Nov 19, 1990	Cass Oil Company	Concho	Pfluger, Don #1	3,600	09531228
381059	Nov 16, 1990	Nov 16, 1990	Cass Oil Company	Irion	Hoyt, Joan Crews #16	6,700	23532966
380415	Nov 2, 1990	Nov 2, 1990	Cass Oil Company	Irion	Hoyt, Joan Crews #15	6,700	23532963
378824	Oct 4, 1990	Oct 4, 1990	Cass Oil Company	Irion	Hoyt, Joan Crews #1 S	1,500	23532960
378079	Sep 17, 1990	Sep 17, 1990	Cass Oil Company	Irion	Hoyt, Joan Crews #14	6,700	23532954
377060	Aug 27, 1990	Aug 27, 1990	Cass Oil Company	Irion	Hoyt, Joan Crews #12	6,700	23532953
376464	Aug 10, 1990	Aug 10, 1990	Cass Oil Company	Irion	Hoyt, Joan Crews #11	6,700	23532952
376286	Aug 6, 1990	Aug 6, 1990	Cass Oil Company	Irion	Reed #1A	7,300	23532951
375882	Jul 26, 1990	Jul 26, 1990	Cass Oil Company	Irion	Reed #1	7,300	23532948
368444	May 4, 1990	May 4, 1990	Cass Oil Company	Irion	Hoyt, Joan Crews #8	6,700	23532913
371441	Mar 30, 1990	Mar 30, 1990	Cass Oil Company	Irion	Hoyt, Joan Crews #10	6,700	23532923
371367	Mar 23, 1990	Mar 23, 1990	Cass Oil Company	Crane	Dawson Estate #1	6,000	10334044
370226	Feb 23, 1990	Feb 23, 1990	Cass Oil Company	Irion	Hoyt, Crews Joan #9	6,700	23532915

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 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/139586, documented in the API reference.