O'BRIEN, J. M.

Oil · District 02 · Lease #3981

Operator: PRIMROSE OPERATING COMPANY

Fields: GRETA (4400)

Cum Oil

380k BBL

Cum Gas

252k MCF

casinghead

Wells

10

Production

1993-01 — 2026-04

Peak Month

1998-12

Production History

Cum Oil: 379,681 BBL Cum Gas: 252,482 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,920 BBL/mo

Di (annual)

9.9%

b-factor

0.0

EUR

229,985 BBL

R-squared

0.628

type

exponential

Operator History (from monthly production reports)

2020-12 — 2026-07 DORCHESTER OPERATING COMPANY LLC 68 mo
2010-11 — 2020-11 ACOCK/ANAQUA OPERATING CO., LP 121 mo
2007-10 — 2010-10 CAMBRIAN MANAGEMENT, LTD. 37 mo
2007-04 — 2007-09 CAMBRIAN MANAGEMENT LTD 6 mo
2001-11 — 2007-03 PRIMROSE OPERATING COMPANY 65 mo
2000-04 — 2001-10 EXXON MOBIL CORPORATION 19 mo
1993-01 — 2000-03 EXXON CORP. 87 mo

Wells (10)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
312DORCHESTER OPERATING COMPANY LLC24,9002010-02-25
312ADORCHESTER OPERATING COMPANY LLC24,9002010-02-25
109DORCHESTER OPERATING COMPANY LLC67,0002008-07-21
107DORCHESTER OPERATING COMPANY LLC13,5012008-04-10
313DORCHESTER OPERATING COMPANY LLC25,6001989-07-07
309DORCHESTER OPERATING COMPANY LLC16,3001983-06-07
10242-391-00832DORCHESTER OPERATING COMPANY LLC------
31042-391-30392DORCHESTER OPERATING COMPANY LLC------
310A42-391-30392DORCHESTER OPERATING COMPANY LLC------
4142-391-01050DORCHESTER OPERATING COMPANY LLC------