Petrora

FORMATIONS · RRC WELLBORE FILE

Greta

Reported as a top in 1,947 wells across 15 counties, at a median depth of 4,450 ft (3,610 to 5,102 ft in most wells). 45 of those wells were permitted in the last three years.

A well counts if any of its completion filings report this formation, whether it produces from it or drilled through it. Depths are measured depth as filed; typo depths exist, which is why ranges are percentiles, not extremes. About completion reports →

1.95K
wells reporting a top
45
permitted in last 3 years
15
counties
4,450
median top, ft

COMPUTED OCT 29, 2026 · REBUILT DAILY

Depth by county

Counties with at least five wells reporting the top. Bars are well counts.

CountyWellsMedian, ftP10–P90Last 3 yrs
Refugio
803
4,3763,953–4,52529
Victoria
411
4,6503,240–5,0100
Jackson
375
5,0713,708–5,28310
San Patricio
148
4,8213,640–5,1490
Wharton
87
4,2503,738–5,2081
Nueces
52
4,8673,328–6,2632
Calhoun
39
4,8024,229–5,7080
Goliad
12
3,3152,624–3,9783
Bee
7
2,8602,766–3,2100

Operators

Current operator of record for wells reporting the top, ranked by wells permitted in the last three years.

OperatorLast 3 yrsAll
T-C Oil Company, LLC2286
Hilcorp Energy Company886
T-C Oil Company, LLC3243
Quintana Pet. Corp.291
Mobil Producing TX. & N.M. Inc.277
Vintage Petroleum, Inc.135
Ken Petroleum Corporation114
Dinero Oil Corporation110
Phere Operating Inc14
Pennzoil Producing Co.13
Great Western Drilling Company12
HG Operating LLC11
Greta Operating Company LLC11
Cummins & Walker Oil Co., Inc.050
Brayton Operating Corp.042
Chilton Energy041
Acock Engineering & Assoc., Inc.034
Anaqua Oil & Gas, Inc.030
Gilster, Ralph R. III029
Hart Petroleum Services, Inc028
Allegro Investments, Inc.025
Carter Exploration Company020
Natural Resources Corp of Texas020
Wiser Oil Company, The018
Sue-Ann Operating, L.C.016

Recently permitted wells reporting the Greta

BY LAST PERMIT ISSUED

Last permitLeaseOperatorCountyTop, ftAPI
Oct 27, 2026Duke Ranch -20-T-C Oil Company, LLCGoliad3,65517534282
Oct 16, 2026West Ranch -A-Hilcorp Energy CompanyJackson5,10223933833
Sep 25, 2026Anderson, Mary Alice et al 'A'T-C Oil Company, LLCRefugio4,63539131640
Sep 21, 2026West Ranch AHilcorp Energy CompanyJackson5,03823933580
Apr 6, 2026Duke Ranch -19-T-C Oil Company, LLCGoliad3,43017534281
Feb 26, 2026O'Connor-H-Clay Past-State UnitT-C Oil Company, LLCRefugio3,72839133186
Jan 28, 2026Duke Ranch -8-T-C Oil Company, LLCGoliad3,53617533882
Jan 9, 2026O'Connor -H-T-C Oil Company, LLCRefugio3,82039133340
Dec 19, 2025Braman -G-T-C Oil Company, LLCRefugio5,07539133258
Sep 26, 2025Clay Pasture -B- State UnitT-C Oil Company, LLCRefugio3,85039132876
Aug 5, 2025Tom Oconnor (5800 SD) Fld. UnitHilcorp Energy CompanyRefugio4,42039132502
Jul 24, 2025WLPT-C Oil Company, LLCRefugio4,48039133261
Mar 3, 2025Braman -H-T-C Oil Company, LLCRefugio5,14039133274
Feb 11, 2025O'ConnorT-C Oil Company, LLCRefugio4,36039133224
Jan 8, 2025O'ConnorT-C Oil Company, LLCRefugio4,42039133271
Sep 30, 2024West Ranch "A"Mobil Producing TX. & N.M. Inc.Jackson5,00023902674
Sep 26, 2024West Ranch -A-Mobil Producing TX. & N.M. Inc.Jackson5,02523932014
Sep 18, 2024West Ranch -A-Hilcorp Energy CompanyJackson5,10223933709
Sep 11, 2024Drummond, J.H.Phere Operating IncJackson5,10223933576
Sep 11, 2024J. M. O'Brien AGreta Operating Company LLCRefugio4,34039132649
Aug 9, 2024RobbinsHG Operating LLCJackson5,35023933588
Jul 1, 2024Tom O'Connor (5800'SD)FIELD UnitQuintana Pet. Corp.Refugio4,36239131923
Jun 5, 2024West Ranch -A-Hilcorp Energy CompanyJackson5,00023933754
May 28, 2024O'Connor -D-T-C Oil Company, LLCRefugio4,49039133336
May 22, 2024ChuranKen Petroleum CorporationWharton5,26748132560

About this data

Formation tops, elevations, perforations, and casing from the RRC dbf900 wellbore file, refreshed weekly, with reported names normalized to Petrora's formation registry. County and operator breakdowns are rebuilt nightly.

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