Petrora

FORMATIONS · RRC WELLBORE FILE

Walnut

Reported as a top in 37 wells across 7 counties, at a median depth of 4,312 ft (399 to 4,892 ft in most wells). 0 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 →

37
wells reporting a top
0
permitted in last 3 years
7
counties
4,312
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
Cooke
18
4,7424,551–4,9160
McLennan
11
402350–4480

Operators

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

OperatorLast 3 yrsAll
Slick Inc.04
Arco Oil & Gas Co.04
Merit Energy Company03
Young Brothers, Inc.02
Chevron U. S. A. Inc.02
Cimarex Energy Co. of Colorado02
Trend Resources Limited02
R. E. B. Production Company01
Mobil Oil Corporation01
Horton & Sorrells01
Bosque Energy Company01
Brazos Oil Co.01
Gruy Petroleum Management Co.01
Comer, David01
Mitchell Energy Corporation01
Vastar Resources, Inc.01
Texas Intl. Gas & Oil, Inc.01
Atlantic Richfield Co.01

Recently permitted wells reporting the Walnut

BY LAST PERMIT ISSUED

Last permitLeaseOperatorCountyTop, ftAPI
Oct 8, 2015MagnessMitchell Energy CorporationMadison10,03031330475
Mar 11, 2015Walnut Bend Unit No. 2Merit Energy CompanyCooke4,67009702613
Apr 4, 2014Putnam School District UnitMerit Energy CompanyCooke4,73809702719
Dec 4, 2013Walnut Bend Unit 2Merit Energy CompanyCooke4,68609730361
Aug 20, 2013Hough - Shivers AChevron U. S. A. Inc.Panola3,13036538062
May 21, 2013SE Matthews UnitChevron U. S. A. Inc.Panola3,24236538046
Sep 5, 2008Walnut Bend Field UnitCimarex Energy Co. of ColoradoCooke4,55409702682
Jun 12, 2008Walnut Bend Field UnitCimarex Energy Co. of ColoradoCooke4,93609700970
Nov 8, 2006Wilson "B"Slick Inc.McLennan39830930417
Nov 7, 2006Wilson "B"Slick Inc.McLennan39830930415
Nov 7, 2006Wilson "B"Slick Inc.McLennan39930930416
Nov 7, 2006Wilson "B"Slick Inc.McLennan40230930418
Feb 25, 2005Walnut Bend Field Unit 2Gruy Petroleum Management Co.Cooke4,54509700988
Sep 20, 1994McGeorge, PercyVastar Resources, Inc.Cooke4,78809702701
Jun 10, 1991Wilson "B"Bosque Energy CompanyMcLennan44830930410
Mar 14, 1991Walnut Bend Field Unit No. 2Arco Oil & Gas Co.Cooke4,71009731538
Jun 4, 1987Walnut Bend Unit No. 2Arco Oil & Gas Co.Cooke4,74609731520
Jan 14, 1987Barrett, Lloyd C.Brazos Oil Co.McLennan35030930400
Feb 19, 1985Clay, ElizabethComer, DavidMcLennan45130930393
Mar 15, 1984Sorrells, James C.Horton & SorrellsMcLennan43130930387
Nov 4, 1983Haydon, MyrtleTrend Resources LimitedFranklin4,30015930340
Mar 14, 1983Walnut Bend Field Unit No. 1Arco Oil & Gas Co.Cooke4,91509701032
Sep 8, 1982Haydon, MyrtleTrend Resources LimitedFranklin4,31215930316
Feb 27, 1982Walnut Bend Field Unit No. 1Arco Oil & Gas Co.Cooke4,86509700986
Mar 4, 1981Young Brothers, Inc.Young Brothers, Inc.McLennan41030930215

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/walnut, documented in the API reference.