ANNIS

Oil · District 7B · Lease #4268

Operator: WALTER EXPLORATION INC.

Cum Oil

93k BBL

Cum Gas

8k MCF

casinghead

Wells

11

Production

1993-01 — 2026-04

Peak Month

2011-10

Production History

Cum Oil: 92,757 BBL Cum Gas: 7,755 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

616 BBL/mo

Di (annual)

11.4%

b-factor

0.0

EUR

64,588 BBL

R-squared

0.429

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
2011-12 — 2017-05 MERIT ENERGY COMPANY 66 mo
2010-11 — 2011-11 PLANTATION OPERATING, LLC 13 mo
2001-10 — 2010-10 WALTER EXPLORATION COMPANY 109 mo
1998-01 — 2001-09 WALTER EXPLORATION INC. 45 mo
1993-01 — 1997-12 MARTIN OIL CO. 60 mo

Wells (11)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
14GRAYROCK ENERGY II, LLC24,7002014-08-25
102GRAYROCK ENERGY II, LLC15,0002012-02-22
101GRAYROCK ENERGY II, LLC25,0002011-06-06
15GRAYROCK ENERGY II, LLC14,8001992-05-22
16GRAYROCK ENERGY II, LLC15,6001992-05-07
13GRAYROCK ENERGY II, LLC15,5001987-04-03
12GRAYROCK ENERGY II, LLC24,6001981-06-23
10GRAYROCK ENERGY II, LLC14,7001979-12-31
142-433-80135GRAYROCK ENERGY II, LLC------
342-433-01146GRAYROCK ENERGY II, LLC------
742-433-80139GRAYROCK ENERGY II, LLC------