Petrora

FORMATIONS · RRC WELLBORE FILE

San Andres

Reported as a top in 89,374 wells across 49 counties, at a median depth of 4,184 ft (1,900 to 4,832 ft in most wells). 6,387 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 →

89.4K
wells reporting a top
6,387
permitted in last 3 years
49
counties
4,184
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
Andrews
10,450
4,4754,235–4,857282
Midland
8,408
4,5474,106–5,2011,201
Martin
7,093
4,2323,648–4,7571,169
Ector
6,493
4,1243,478–4,79099
Howard
6,369
3,0902,018–3,566427
Yoakum
6,260
4,5554,373–5,088130
Gaines
5,380
4,5224,315–4,981220
Hockley
4,740
4,2263,800–4,94731
Upton
4,611
4,4883,781–4,933762
Reagan
3,361
3,1962,293–3,813657
Glasscock
3,206
3,4932,184–4,000261
Crane
2,711
2,9612,593–3,494272
Scurry
2,334
1,6701,441–1,97656
Pecos
2,224
1,5281,200–2,288202
Cochran
1,870
4,2953,997–4,9766
Garza
1,833
2,3701,690–3,10415
Mitchell
1,593
1,6101,419–1,76441
Dawson
1,548
4,4083,610–4,869131
Crockett
1,451
1,8511,244–2,50036
Irion
1,428
1,8001,054–2,145103
Terry
1,053
4,5284,300–5,13528
Winkler
974
3,8483,530–4,19975
Borden
895
3,1502,297–3,536115
Ward
776
3,5282,909–3,83221
Crosby
662
2,7472,450–2,9602
Sterling
531
1,9761,593–2,3264
Tom Green
250
826516–1,0328
Kent
199
1,2581,100–1,82619
Lubbock
172
3,3822,984–4,2898
Lynn
136
3,8413,062–4,3971
Lamb
98
3,2283,005–4,0780
Fisher
87
775338–1,1454
Hale
78
3,1332,961–3,9001
Throckmorton
50
750404–1,2500
Terrell
14
1,7651,275–2,3620
Schleicher
12
1,094767–1,5780
Motley
5
889799–1,7490

Operators

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

OperatorLast 3 yrsAll
Pioneer Natural Res. USA, Inc.1,2114,982
Diamondback E&P LLC5922,028
Endeavor Energy Resources L.P.2441,940
Blackbeard Operating, LLC241979
OXY USA WTP LP195891
COG Operating LLC1911,232
Marathon Oil Company1891,424
Ovintiv USA Inc.184519
XTO Energy Inc.1802,643
Apache Corporation1721,899
DE IV Operating, LLC172310
DE IV Operating, LLC149149
Civitas Permian Operating, LLC145145
Chevron U. S. A. Inc.1361,736
Highpeak Energy Holdings, LLC136395
SM Energy Company128760
Occidental Permian Ltd.1213,087
Surge Operating, LLC119732
Oxyrock Operating, LLC1061,622
Triple Crown Resources, LLC104220
Oxyrock Operating, LLC101101
Summit Petroleum LLC92461
Firebird Energy II LLC8888
Utoco, Ltd.77880
Ring Energy, Inc.59440

Recently permitted wells reporting the San Andres

BY LAST PERMIT ISSUED

Last permitLeaseOperatorCountyTop, ftAPI
Oct 26, 2026West Seminole SA UnitOXY USA WTP LPGaines4,71616500636
Oct 26, 2026West Seminole SA UnitOXY USA WTP LPGaines5,08216502768
Oct 21, 2026West Seminole SA UnitOXY USA WTP LPGaines4,72016538557
Oct 21, 2026West Seminole SA UnitOXY USA WTP LPGaines4,70816538559
Oct 19, 2026Young-HankinsYoung, Marshall R., Oil CompanyHockley4,14021934444
Oct 13, 2026Seminole San Andres UnitOXY USA Inc.Gaines4,67916500032
Oct 13, 2026Seminole San Andres UnitOXY USA Inc.Gaines4,16816501824
Oct 8, 2026West Seminole SA UnitOXY USA WTP LPGaines4,59716500633
Oct 8, 2026West Seminole SA UnitOXY USA WTP LPGaines5,01216501587
Oct 7, 2026Denver UnitOccidental Permian Ltd.Gaines4,35016530365
Oct 6, 2026Bennett Ranch UnitOccidental Permian Ltd.Yoakum4,59550134870
Oct 5, 2026Seminole San Andres UnitOXY USA Inc.Gaines4,73916501849
Oct 5, 2026Seminole San Andres UnitOXY USA Inc.Gaines4,70016502072
Oct 2, 2026Edwards, C. W., et ALPitts Energy Co.Ward3,49647533893
Sep 27, 2026Keystone Cattle Co. AWhiting Oil and Gas CorporationWinkler4,11949533339
Sep 25, 2026West Seminole SA UnitOXY USA WTP LPGaines4,58416538405
Sep 25, 2026West Seminole SA UnitOXY USA WTP LPGaines4,61016538446
Sep 24, 2026Denver UnitOccidental Permian Ltd.Gaines4,20016530431
Sep 24, 2026West Seminole SA UnitOXY USA WTP LPGaines4,59416538299
Sep 21, 2026Whiteface UnitDouble Barrel Oil LLCCochran4,00507901639
Sep 21, 2026West Brahaney UnitWalsh Petroleum, Inc.Yoakum5,21050134479
Sep 14, 2026Logsdon, Etal -D-Texland Petroleum, L.P.Andrews4,33000305265
Sep 14, 2026Seminole San Andres UnitOXY USA Inc.Gaines4,72516531381
Sep 14, 2026Gilded LadyBlackbeard Operating, LLCWinkler4,06549534047
Sep 14, 2026West Brahaney UnitWalsh Petroleum, Inc.Yoakum5,20050135551

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/san-andres, documented in the API reference.