SHANNON ESTATE -B-

Oil · District 7C · Lease #1277

Operator: ZEPHYR LONE STAR OPER CO.,L.L.C.

Cum Oil

945k BBL

Cum Gas

22 MCF

casinghead

Wells

57

Production

1993-01 — 2026-04

Peak Month

2012-11

Production History

Cum Oil: 945,100 BBL Cum Gas: 22 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,751 BBL/mo

Di (annual)

8.4%

b-factor

0.2

EUR

613,238 BBL

R-squared

0.658

type

hyperbolic

Operator History (from monthly production reports)

2017-07 — 2026-07 CLARK OIL CO. 109 mo
2005-02 — 2017-06 SUNDOWN ENERGY LP 149 mo
2003-01 — 2005-01 SUNDOWN ENERGY, INC. 25 mo
2002-12 — 2002-12 ZEPHYR LONE STAR OPER CO.,L.L.C. 1 mo
1993-01 — 2002-11 ENERGY PRODUCTION CORPORATION 119 mo

Wells (57)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
13CLARK OIL CO.12,1802012-09-25
11CLARK OIL CO.12,5002012-08-08
30RCLARK OIL CO.12,3302012-08-08
4CLARK OIL CO.22,5002012-08-08
23CLARK OIL CO.22,4502012-07-31
58WCLARK OIL CO.22,4002006-01-06
39CLARK OIL CO.22,4002004-03-17
1CLARK OIL CO.12,2351997-11-26
18CLARK OIL CO.12,2751997-10-15
5CLARK OIL CO.12,3001997-10-15
41CLARK OIL CO.22,4001996-06-05
3ACLARK OIL CO.12,7501995-05-31
36ACLARK OIL CO.22,7361994-12-14
14CLARK OIL CO.12,0681991-06-17
24CLARK OIL CO.12,1601991-06-17
59CLARK OIL CO.12,3501984-05-17
54CLARK OIL CO.12,5001982-10-12
55CLARK OIL CO.12,5001982-10-12
56CLARK OIL CO.12,5001982-10-12
57CLARK OIL CO.12,5001982-10-12
49CLARK OIL CO.12,4001982-03-31
51CLARK OIL CO.12,4001982-03-31
52CLARK OIL CO.12,4001982-03-31
53CLARK OIL CO.12,4001982-03-31
50CLARK OIL CO.12,4001982-03-16
35CLARK OIL CO.12,2501981-08-20
46CLARK OIL CO.12,3501980-11-07
47CLARK OIL CO.12,3501980-11-07
48CLARK OIL CO.12,3501980-11-07
22CLARK OIL CO.12,4501980-04-09
42CLARK OIL CO.12,4001979-08-17
43CLARK OIL CO.12,4001979-08-17
44CLARK OIL CO.12,4001979-08-17
40CLARK OIL CO.12,4001979-05-03
38CLARK OIL CO.12,4001978-11-14
37CLARK OIL CO.12,6001977-12-05
1042-105-03003CLARK OIL CO.------
1242-105-03007CLARK OIL CO.------
15W42-105-03120CLARK OIL CO.------
1642-105-03013CLARK OIL CO.------
1942-105-03558CLARK OIL CO.------
242-105-02986CLARK OIL CO.------
2042-105-03016CLARK OIL CO.------
2142-105-03017CLARK OIL CO.------
2542-105-03021CLARK OIL CO.------
2642-105-03022CLARK OIL CO.------
2742-105-03023CLARK OIL CO.------
2842-105-03024CLARK OIL CO.------
29W42-105-03025CLARK OIL CO.------
32W42-105-03028CLARK OIL CO.------
3342-105-03029CLARK OIL CO.------
3442-105-03030CLARK OIL CO.------
36W42-105-03498CLARK OIL CO.------
642-105-02995CLARK OIL CO.------
742-105-02997CLARK OIL CO.------
842-105-02999CLARK OIL CO.------
942-105-03001CLARK OIL CO.------