Petrora

OPERATORS · RRC 766370  · P-5 STATUS Y

Sem Oper Co LLC

Houston, TX · most active in Irion County

Watch this operator

Sem Oper CO LLC was issued 21 drilling permits in the past 12 months, down 12% on the prior year, across 2 counties led by Irion with 13. 100% were horizontal.

4 were issued in the past 90 days, versus 9 in the prior quarter.

The RRC wellbore file lists 523 wells under its operatorship (416 producing, 28 shut in).

Lease reports credit it with 5M barrels of oil and 56M mcf of gas in the 12 months reported through April 2026, up 4% on the year before.

It holds 8 active disposal or injection permits, injecting 16.9M barrels in the 12 months reported through June 2025.

404 drilling permits have been issued to this operator number since 2010; its P-5 organization report was last filed April 4, 2026.

21
permits, last 12 months
-12%
vs prior 12 months (24)
2
counties, 12 months
416
producing wells, of 523 of record
116
leases it reports
100%
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.

83%
spud rate · 325 of 391 mature permits
26
median days permit to spud · middle half 9–51
9
spuds, last 180 days +125%
0%
cancelled · 0 permits
70
expired undrilled
24
permits a year over 17 active years

Permits issued by month

LAST 30 MONTHS · BY ISSUE DATE

Last 12 months 49 · prior 12 41(+20%)

0102020222023202420252026

Where

Counties by permits in the last 12 months, with all-time permits and current wells of record there.

County12 moAll timeWellsLast
Irion county →13127203Oct 21, 2026
Crockett county →83579Oct 19, 2026
Reagan county →—175200Sep 24, 2025
Houston county →—4630May 1, 2018
Madison county →—167Jan 25, 2017
Dawson county →—20May 11, 2015
Grimes county →—21Sep 11, 2015
Gaines county →—11Dec 5, 2014

All 404 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 →

FormationWellsPermitted last 3 yrs
San Andres21632
Wolfcamp21532
Spraberry19932
Clear Fork19732
Grayburg1150
Queen690
Sub-Clarksville320
Woodbine310
Buda300
Glen Rose240
Edwards210
Yates150
Leonard110
Georgetown100
Eagle Ford70

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 →

5M
bbl oil, last 12 reported months
+4%
vs the 12 months before
56M
mcf gas incl. casinghead, last 12
46.3M
bbl oil since reporting began

Gas, mcf

Last 12 months 56,049,808 · prior 12 56,606,881(-1%)

02M4M6M202420252026

Oil, barrels

Last 12 months 4,999,530 · prior 12 4,795,433(+4%)

0200K400K600K202420252026

Beyond the permit record

RRC wellbore file

Wells of record

523
on the schedule
416
producing
28
shut in
4
injection
0
temp. abandoned
21
plugged

How it got them

216
permitted itself
307
acquired from others
31
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

8
active UIC permits of 13
180K
permitted bbl/day, active
16.9M
bbl injected, last 12 reported months
Jun 2025
reported through

By county

Reagan6 active140K bbl/d
Crockett1 active30K bbl/d
Irion1 active10K bbl/d
Schleicher0 active0 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 →

Type12 moPrior 12All time
Drill2124394
Recompletion009
Other001

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.

FieldWellsProducing
Lin (Wolfcamp)53613750468411
Fort Trinidad (Glen Rose Upper)32156852330
Spraberry (Trend Area)85280300154
Fort Trinidad East (Buda)3215707130
Wildcat600110
Fort Trinidad (James Lime)3215686110
Lavan (Wolfcamp)5236848011
Big Lake791900110

P-5 organization report

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

Registration
Status code Y
Last filed Apr 4, 2026
Gas operatorOil operator
Address
Suite 1850 2050 West Sam Houston Pkwy S
Houston, TX 77042
(877) 447-2289
Officers and agents
Josey, Scott Dwayne · Manager
Perry, Russell · Member

Latest permits

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

PermitSeenIssuedOperatorCountyLease / wellDepthAPI
919384Oct 23, 2026Oct 21, 2026Sem Operating Company LLCIrionUniversity 40 A #0405WCH10,00023536794
919383Oct 23, 2026Oct 21, 2026Sem Operating Company LLCIrionUniversity 40 A #0403WCH10,00023536793
919380Oct 21, 2026Oct 19, 2026Sem Operating Company LLCCrockettUniversity 40 B #1603WCH10,00010542579
919379Oct 21, 2026Oct 19, 2026Sem Operating Company LLCCrockettUniversity 40 B #1601WCH10,00010542578
917106Jul 14, 2026Jul 14, 2026Sem Operating Company LLCIrionUniversity 40 #1102WAH10,00023536784
917033Jul 13, 2026Jul 13, 2026Sem Operating Company LLCCrockettUniversity 40 #1511WCH10,00010542577
917032Jul 13, 2026Jul 13, 2026Sem Operating Company LLCCrockettUniversity 40 #1509WCH10,00010542576
917031Jul 13, 2026Jul 13, 2026Sem Operating Company LLCCrockettUniversity 40 #1507WCH10,00010542575
917028Jul 13, 2026Jul 13, 2026Sem Operating Company LLCCrockettUniversity 40 #1503WCH10,00010542574
915430May 11, 2026May 11, 2026Sem Operating Company LLCIrionUniversity 40 E #1803WCH10,00023536766
915430May 11, 2026May 11, 2026Sem Operating Company LLCIrionUniversity 40 E #1803WCH10,00023536766
915429May 8, 2026May 8, 2026Sem Operating Company LLCIrionUniversity 40 E #1803WBH10,00023536765
915429May 8, 2026May 8, 2026Sem Operating Company LLCIrionUniversity 40 E #1803WBH10,00023536765
914036Mar 12, 2026Mar 12, 2026Sem Operating Company LLCIrionUniversity 40D #0703WCH10,00023536748
914031Mar 12, 2026Mar 12, 2026Sem Operating Company LLCIrionUniversity 40D #0701WCH10,00023536747

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/766370, documented in the API reference.