Petrora

WELL · 42-391-31942 · DISTRICT 2

Oconnor #66

N

Refugio County · T-C (5600) field  · Vertical

Oconnor #66 (API 42-391-31942) is a well in Refugio County operated by T-C Oil Company LLC, completed June 10, 1992.

The RRC has issued 6 drilling permits (amended once) between 1987 and 2005, permitted to 5,850 ft.

It was permitted by T - C Oil Company and has since transferred to T-C Oil Company LLC on the wellbore schedule.

Completion filings report 7 formation tops, including Lagarto, Miocene (undifferentiated), Ecocene, Eocene.

Its 6 leases have reported 862K barrels of oil and 1.08M mcf of gas since January 1993, last reporting in July 2026. The leases carry 49 wells, so these are lease totals, not this well alone.

Operator of record

T-C Oil Company LLC

Permitted by T - C Oil Company; the EWA schedule now lists a different operator.

Based in
Refugio, TX
P-5 status
Active (A)
P-5 last filed
Dec 3, 2025
Permits on file
287
Phone
(361) 526-4693

SOURCE · RRC EWA WELLBORE SCHEDULE

What each RRC source says

Wellbore scheduleT-C Oil Company LLC
Production reportsT-C Oil Company, LLCthrough Apr 2026
Latest permitT - C Oil CompanyAug 3, 2005

The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.

5,850
total depth, ft
7
permits on file
Aug 3, 2005
last permit issued
Jun 10, 1992
completed
862K
cumulative oil, bbl
1.08M
cumulative gas, mcf

PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026

Regulatory status · RRC wellbore file

Schedule
OFF SCHEDULE
Completed
Jun 10, 1992
Shut in
—
Plugged
—

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 6 leases this well is completed on; they carry 49 wells in total, so volumes are shared.Why →

LeaseFieldReporting operatorWellsOil, bblGas, mcfReported
Oconnor O-2-1503T-C (5600)T-C Oil Company, LLC1952K203KJan 1993 – Jul 2026
O'Connor O-2-8367Huff (4400)T-C Oil Company, LLC19693K597KJan 1998 – Jul 2026
O'Connor G-2-197220Huff ( 403)T - C Oil Company1036.4KJun 2003 – Jul 2005
Oconnor O-2-4783McFaddin (4400)T - C Oil Company10117K248KJan 1993 – May 1998
— G-2-124497——000—
— G-2-139082——000—

Oil, barrels lease total

Last 12 months 46,240 · prior 12 55,329(-16%)

02K4K6K202420252026

Gas, mcf lease total

Last 12 months 13,361 · prior 12 26,209(-49%)

02K4K6K202420252026

Chain of custody

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

  1. 1T - C Oil CompanyJan 1993 → Dec 2011
  2. 2T-C Oil Company, LLCJan 2012 → Apr 2026

Permits

PermitTypeOperatorReceivedIssuedSpudDepth
604279-99RecompletionT - C Oil CompanyAug 2, 2005Aug 3, 2005Jul 13, 20054,500
533654-99RecompletionT - C Oil CompanyJun 30, 2003Jul 2, 2003Jun 18, 20034,336
457111-99RecompletionT - C Oil CompanyJan 8, 1997Jan 14, 1997Dec 23, 19965,600
392866-98RecompletionT - C Oil CompanyMay 20, 1992Oct 16, 1991May 27, 19925,770
392866-99RecompletionT - C Oil CompanyOct 14, 1991Oct 16, 1991—5,850
389001-99RecompletionT - C Oil CompanyJun 17, 1991Jun 24, 1991Jun 25, 19915,850
329178-99DrillT - C Oil CompanyApr 17, 1987Apr 17, 1987—5,850

Completions

CompletedLeaseFieldOperatorStatusDepth
—— G-2-124497————
—— G-2-139082————
—— G-2-197220————
—— O-2-1503————
—— O-2-4783————
—— O-2-8367————
—— O-2-8367————

Formation tops

As filed on W-2/G-1. Subsea from 63 ft elevation.Download CSV →

FormationMD ftSubsea
Lagarto162
LagartoLARGARTO162
Miocene (undifferentiated)MIOCENE2,055-1,992
Ecocene2,310-2,247
Eocene2,310-2,247
Lagarto2,310-2,247
Miocene (undifferentiated)MIOCENE2,980-2,917
Catahoula3,710-3,647
Catahoula3,720-3,657
Greta4,380-4,317
Greta4,405-4,342
Frio4,770-4,707
Frio4,799-4,736

Perforations

Perforated and open-hole intervals.

FromToType
4,1894,192Perforated
4,4064,415Perforated
4,4614,464Perforated
5,3165,319Perforated
5,3795,383Perforated
5,6235,628Perforated

Casing

Strings as reported, shallowest first.

Casing inSet atHole inCement
9.6251,36113.5643 S
5.55,8138.751,225 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
00Dec 22, 2005Aug 4, 2005—
00Sep 28, 2005——
00Mar 5, 2004Jul 16, 2003Yes
00Oct 27, 2003——
00Jun 1, 1998Jan 21, 1997Yes
00Mar 26, 1997Jan 21, 1997Yes
00Mar 5, 1997——
00Aug 11, 1992Jun 25, 1992Yes
00Jul 14, 1992——
00Nov 7, 1991Jul 10, 1991Yes
00Aug 30, 1991——
00Jul 23, 1987Jun 10, 1987Yes
00Jul 7, 1987——

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/39131942, documented in the API reference.