KEY, E.

Oil · District 10 · Lease #644

Operator: XTO ENERGY INC.

Cum Oil

206k BBL

Cum Gas

80k MCF

casinghead

Wells

20

Production

1993-01 — 2026-04

Peak Month

1996-05

Production History

Cum Oil: 205,950 BBL Cum Gas: 80,448 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,073 BBL/mo

Di (annual)

6.7%

b-factor

0.0

EUR

186,334 BBL

R-squared

0.842

type

exponential

Operator History (from monthly production reports)

2021-11 — 2026-07 LARGE OPERATING LLC 57 mo
2004-09 — 2021-10 XTO ENERGY INC. 206 mo
2002-06 — 2004-08 CHEVRON U. S. A. INC. 27 mo
1993-01 — 2002-05 TEXACO E & P INC. 113 mo

Wells (20)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
26LARGE OPERATING LLC13,2501996-03-12
25LARGE OPERATING LLC13,2501995-05-22
1042-179-01724LARGE OPERATING LLC------
1142-179-01725LARGE OPERATING LLC------
1242-179-01210LARGE OPERATING LLC------
1342-179-01193LARGE OPERATING LLC------
1442-179-01209LARGE OPERATING LLC------
1542-179-01208LARGE OPERATING LLC------
1642-179-01214LARGE OPERATING LLC------
1742-179-01211LARGE OPERATING LLC------
18W42-179-83325LARGE OPERATING LLC------
1942-179-01213LARGE OPERATING LLC------
2042-179-83327LARGE OPERATING LLC------
2142-179-01207LARGE OPERATING LLC------
2342-179-01727LARGE OPERATING LLC------
2442-179-01728LARGE OPERATING LLC------
542-179-01718LARGE OPERATING LLC------
642-179-83314LARGE OPERATING LLC------
842-179-01722LARGE OPERATING LLC------
942-179-01723LARGE OPERATING LLC------