CHALK, OTIS /EO/

Oil · District 08 · Lease #2727

Operator: WOOD, MCSHANE & THAMS

Cum Oil

243k BBL

Cum Gas

168k MCF

casinghead

Wells

10

Production

1993-01 — 2011-11

Peak Month

1997-11

Production History

Cum Oil: 243,332 BBL Cum Gas: 167,944 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,613 BBL/mo

Di (annual)

90.8%

b-factor

1.5

EUR

296,350 BBL

R-squared

0.945

type

hyperbolic

Operator History (from monthly production reports)

2006-05 — 2013-03 CIMAREX ENERGY CO. OF COLORADO 83 mo
2002-04 — 2006-04 GRUY PETROLEUM MANAGEMENT CO. 49 mo
2000-03 — 2002-03 PRIZE OPERATING COMPANY 25 mo
1995-11 — 2000-02 VISTA RESOURCES, INC. (A) 52 mo
1993-01 — 1995-10 WOOD, MCSHANE & THAMS 34 mo

Wells (10)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
6GRAYROCK ENERGY II, LLC34,0012001-03-20
6WGRAYROCK ENERGY II, LLC34,0012001-03-20
9GRAYROCK ENERGY II, LLC13,5002001-03-20
1WGRAYROCK ENERGY II, LLC23,4001998-11-20
7GRAYROCK ENERGY II, LLC23,6001997-08-12
8GRAYROCK ENERGY II, LLC13,4001997-04-03
5GRAYROCK ENERGY II, LLC13,1501982-04-06
242-227-01068CIMAREX ENERGY CO. OF COLORADO------
342-227-01069CIMAREX ENERGY CO. OF COLORADO------
442-227-01070GRAYROCK ENERGY II, LLC------