DILLARD "O"

Oil · District 08 · Lease #35381

Operator: COSTILLA ENERGY, INC.

Cum Oil

22k BBL

Cum Gas

200k MCF

casinghead

Wells

1

Production

1997-05 — 1999-09

Peak Month

1997-08

Production History

Cum Oil: 22,471 BBL Cum Gas: 199,662 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

4,557 BBL/mo

Di (annual)

766.4%

b-factor

0.2

EUR

9,148 BBL

R-squared

0.932

type

hyperbolic

Operator History (from monthly production reports)

1997-05 — 2000-01 COSTILLA ENERGY, INC. 33 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4601COSTILLA ENERGY INC.19,0001997-03-13