UNIVERSITY 1 "J"

Oil · District 08 · Lease #35443

Operator: COSTILLA ENERGY, INC.

Cum Oil

20k BBL

Cum Gas

12k MCF

casinghead

Wells

1

Production

1997-06 — 1999-11

Peak Month

1997-06

Production History

Cum Oil: 19,745 BBL Cum Gas: 11,732 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

4,277 BBL/mo

Di (annual)

464.8%

b-factor

0.4

EUR

18,418 BBL

R-squared

0.995

type

hyperbolic

Operator History (from monthly production reports)

1998-12 — 1999-12 CONCHO RESOURCES INC. 13 mo
1997-06 — 1998-11 COSTILLA ENERGY, INC. 18 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1CONCHO RESOURCES INC.29,5001997-04-18