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TEXAS · WELLS · ROBERTS COUNTY · API 42-393-31851 · DISTRICT 08

Vollmert C #4

Shut in

Roberts County · Canadian SE (Douglas) field · Shut In  · Vertical

Vollmert C #4 (API 42-393-31851) is a well in Roberts County operated by Unit Petroleum Company, completed September 13, 2016 and listed as shut in on the RRC schedule, shut in June 1, 2026.

The RRC has issued 3 drilling permits (amended once) between 2006 and 2016, permitted to 11,250 ft.

Completion filings report 8 formation tops, including Brown Dolomite, Douglas, Des Moines, Marmaton.

Its 4 leases have reported 33.1K barrels of oil and 1.44M mcf of gas since September 2006, last reporting in July 2026. The leases carry 7 wells, so these are lease totals, not this well alone.

Operator of record

Unit Petroleum Company

Based in
Tulsa, OK
P-5 status
Active (A)
P-5 last filed
Jan 13, 2025
Permits on file
1,100
Phone
(918) 493-7700
Watch this operatorWatch Roberts County

SOURCE · RRC EWA WELLBORE SCHEDULE

What each RRC source says

Wellbore scheduleUnit Petroleum Company
Production reportsUnit Petroleum Companythrough Apr 2026
Latest permitUnit Petroleum CompanyAug 17, 2016
11,250
total depth, ft
4
permits on file
Aug 17, 2016
last permit issued
Sep 13, 2016
completed
33.1K
cumulative oil, bbl
1.44M
cumulative gas, mcf

PRODUCTION FROM PDQ LEASE REPORTS · Sep 2006 THROUGH Jul 2026

Regulatory status · RRC wellbore file

Schedule
ON SCHEDULE
Completed
Sep 13, 2016
Shut in
Jun 1, 2026
Plugged
—

Operator's P-5 on the schedule: Active (A)

Surface location

No coordinates on the permit record yet. The RRC's GIS record usually lands within days of issuance; historical master-file permits never carry one.

Lease production

PDQ LEASE REPORTS · REPORTED THROUGH APR 2026

Texas reports oil by lease, not by well. These are the 4 leases this well is completed on; they carry 7 wells in total, so volumes are shared.Why →

LeaseFieldReporting operatorWellsOil, bblGas, mcfReported
Vollmert 'C' O-14-9493Canadian, SE (Douglas)Unit Petroleum Company316.6K114KSep 2016 – Jul 2026
Vollmert "C" G-14-233988Mendota, NW. (Granite Wash, SW.)Unit Petroleum Company10760KJan 2008 – Apr 2017
Vollmert 'C' G-14-224645Mendota, N. (Morrow, Upper)Unit Petroleum Company1038.9KSep 2006 – Sep 2016
Vollmert "C" O-14-7779Mendota, NW. (Granite Wash, SW.)Unit Petroleum Company216.5K531KJul 2007 – Mar 2009

Gas, mcf lease total

Last 12 months 11,938 · prior 12 19,717(-39%)

01K2K3K202420252026

Oil, barrels lease total

Last 12 months 1,375 · prior 12 2,363(-42%)

0200400202420252026

Chain of custody

Every operator that reported production on this well's lease, in order.

  1. 1Unit Petroleum CompanySep 2006 → Apr 2026

Permits

PermitTypeOperatorReceivedIssuedSpudDepth
817674-99RecompletionUnit Petroleum CompanyAug 11, 2016Aug 17, 2016Aug 18, 20167,422
640664-99RecompletionUnit Petroleum CompanyJun 13, 2007Jun 25, 2007Jun 4, 200711,250
620803-98DrillUnit Petroleum CompanyOct 5, 2006Jun 13, 2006Jun 19, 200611,250
620803-99DrillUnit Petroleum CompanyJun 12, 2006Jun 13, 2006Jun 19, 200611,250

Completions

CompletedLeaseFieldOperatorStatusDepth
Sep 13, 2016Vollmert C O-14-9493Canadian SE (Douglas)Unit Petroleum CompanyShut In · shut in Jun 1, 202611,250
Jul 22, 2007Vollmert C G-14-233988Mendota NW. (Granite Wash SW.)Unit Petroleum CompanyNot on Schedule—
Jul 22, 2007Vollmert C O-14-7779Mendota NW. (Granite Wash SW.)Unit Petroleum CompanyNot on Schedule—
Sep 16, 2006Vollmert C G-14-224645Mendota N. (Morrow Upper)Unit Petroleum CompanyNot on Schedule—

Formation tops

As filed on W-2/G-1. Subsea from 2,832 ft elevation.Download CSV →

FormationMD ftSubsea
Brown Dolomite4,150-1,318
Douglas6,810-3,978
Douglas6,966-4,134
Des Moines9,142-6,310
Marmaton9,160-6,328
Granite Wash9,516-6,684
Granite Wash9,600-6,768
AtokaATOKA LIME10,705-7,873
13 Finger10,720-7,888
13 Finger10,800-7,968
Morrow10,864-8,032
MorrowMORROW SHALE——

Perforations

Perforated and open-hole intervals.

FromToType
7,3407,414Perforated
9,80610,150Perforated
10,15810,183Perforated
10,22410,657Perforated
10,72310,788Perforated
11,18011,193Perforated

Casing

Strings as reported, shallowest first.

Casing inSet atHole inCement
9.6253,17112.251,380 S
5.511,3507.875510 S

Completion filings

W-2 and G-1 reports on record in the RRC wellbore file, newest first. The suffix identifies the wellbore or completion event. About these reports →

SuffixFiledW-2 / G-1 dateLogs referenced
00Nov 28, 2016Sep 28, 2016—
00Jul 1, 2008Jan 18, 2008—
00Mar 25, 2008——
00Nov 19, 2007Sep 10, 2007Yes
00Nov 9, 2007——
00Apr 17, 2007Feb 8, 2007Yes
00Feb 21, 2007——

The source documents

Petrora holds the structured record. The scanned filings live at the RRC; these links open its search already filled in for this API.

Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). then paste it into their search.

About this data

Permits from the RRC OGA049M master and daily daf420 files; wellbore and operator of record from the EWA schedule, weekly; completions, formation tops, casing, and perforations from the dbf900 wellbore file; production from PDQ lease reports, which lag two to three months; injection from UIC permits, H-10 reports, and TexNet daily volumes; earthquakes from the TexNet catalog.

New to these records? How to read a well page · API numbers · completion reports and tops · why production is by lease

Developers: this page as JSON is GET /v1/data/wells/39331851, documented in the API reference.