FOSTER, R. W. -23-

Oil · District 08 · Lease #4661

Operator: XOG OPERATING LLC

Cum Oil

312k BBL

Cum Gas

26 MCF

casinghead

Wells

7

Production

1993-01 — 2025-07

Peak Month

1995-08

Production History

Cum Oil: 312,113 BBL Cum Gas: 26 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,929 BBL/mo

Di (annual)

16.3%

b-factor

0.0

EUR

216,162 BBL

R-squared

0.863

type

exponential

Operator History (from monthly production reports)

2020-04 — 2026-07 D & D WELL SERVICE, L.L.C. 76 mo
2016-04 — 2020-03 BAYLOR OPERATING, LLC 48 mo
2009-09 — 2016-03 XOG OPERATING LLC 79 mo
2004-07 — 2009-08 BARKER BROWN INVESTMENTS, LLC. 62 mo
2001-06 — 2004-06 XERIC OIL & GAS CORPORATION 37 mo
2000-01 — 2001-05 CAPPS, R. OIL CORP. 17 mo
1999-11 — 1999-12 XERIC OIL & GAS CORPORATION 2 mo
1998-10 — 1999-10 PHARAOH OIL & GAS, INC. 13 mo
1997-09 — 1998-09 WESTCO OIL COMPANY 13 mo
1996-12 — 1997-08 WESTCO PRODUCING COMPANY 9 mo
1996-06 — 1996-11 PHARAOH OIL & GAS, INC. 6 mo
1993-01 — 1996-05 FINA OIL & CHEMICAL COMPANY 41 mo

Wells (7)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2D & D WELL SERVICE, L.L.C.12,3151987-10-22
17WD & D WELL SERVICE L.L.C.12,4001985-03-15
142-431-00094D & D WELL SERVICE L.L.C.------
1042-431-00103D & D WELL SERVICE L.L.C.------
1542-431-10432D & D WELL SERVICE L.L.C.------
342-431-00097D & D WELL SERVICE L.L.C.------
842-431-00101D & D WELL SERVICE L.L.C.------