CHALK, G. O.

Oil · District 08 · Lease #42240

Operator: ROVER PETROLEUM OPERATING, LLC

Cum Oil

563k BBL

Cum Gas

286 MCF

casinghead

Wells

40

Production

2011-12 — 2026-04

Peak Month

2018-12

Production History

Cum Oil: 563,397 BBL Cum Gas: 286 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

4,775 BBL/mo

Di (annual)

6.3%

b-factor

0.0

EUR

876,156 BBL

R-squared

0.328

type

exponential

Operator History (from monthly production reports)

2024-01 — 2026-07 GRAYROCK ENERGY II, LLC 31 mo
2017-06 — 2023-12 ROVER PETROLEUM OPERATING, LLC 79 mo
2013-01 — 2017-05 MERIT ENERGY COMPANY 53 mo
2011-12 — 2012-12 CIMAREX ENERGY CO. OF COLORADO 13 mo

Wells (40)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
56CFGRAYROCK ENERGY II, LLC14,3002018-12-07
55CFGRAYROCK ENERGY II, LLC14,2002018-11-19
36CFGRAYROCK ENERGY II, LLC14,3002018-11-02
37CFGRAYROCK ENERGY II, LLC14,3002018-11-02
46CFGRAYROCK ENERGY II, LLC14,3002018-10-08
48CFGRAYROCK ENERGY II, LLC14,3002018-10-08
41CFGRAYROCK ENERGY II, LLC14,3002018-09-17
43CFGRAYROCK ENERGY II, LLC24,3002018-06-29
44CFGRAYROCK ENERGY II, LLC14,3002018-06-29
33CFGRAYROCK ENERGY II, LLC14,3002018-06-18
35CFGRAYROCK ENERGY II, LLC14,3002018-06-18
32CFGRAYROCK ENERGY II, LLC14,3002014-03-18
31CFGRAYROCK ENERGY II, LLC14,3002014-02-14
27GRAYROCK ENERGY II, LLC14,0001998-04-01
26GRAYROCK ENERGY II, LLC13,0001998-02-04
142-227-04390GRAYROCK ENERGY II, LLC------
1042-227-03884GRAYROCK ENERGY II, LLC------
11W42-227-03885GRAYROCK ENERGY II, LLC------
1242-227-10958GRAYROCK ENERGY II, LLC------
13W42-227-10975GRAYROCK ENERGY II, LLC------
1442-227-10976GRAYROCK ENERGY II, LLC------
1542-227-30012GRAYROCK ENERGY II, LLC------
15W42-227-30012GRAYROCK ENERGY II, LLC------
1642-227-30013GRAYROCK ENERGY II, LLC------
1742-227-30133GRAYROCK ENERGY II, LLC------
1842-227-30136GRAYROCK ENERGY II, LLC------
19W42-227-30132GRAYROCK ENERGY II, LLC------
1 W42-227-30060GRAYROCK ENERGY II, LLC------
1W42-227-30060GRAYROCK ENERGY II, LLC------
2042-227-30157GRAYROCK ENERGY II, LLC------
2242-227-30158GRAYROCK ENERGY II, LLC------
2342-227-30314GRAYROCK ENERGY II, LLC------
2442-227-30339GRAYROCK ENERGY II, LLC------
2542-227-30338GRAYROCK ENERGY II, LLC------
25W42-227-30338GRAYROCK ENERGY II, LLC------
442-227-01881GRAYROCK ENERGY II, LLC------
642-227-03856GRAYROCK ENERGY II, LLC------
742-227-03881GRAYROCK ENERGY II, LLC------
842-227-03882GRAYROCK ENERGY II, LLC------
942-227-03883GRAYROCK ENERGY II, LLC------