HARTT UNIT

Oil · District 03 · Lease #13347

Operator: VALIDUS OPERATING INC.

Fields: CALDWELL (AUSTIN CHALK)

Cum Oil

40k BBL

Cum Gas

133k MCF

casinghead

Wells

1

Production

1993-01 — 2026-04

Peak Month

1996-12

Production History

Cum Oil: 40,401 BBL Cum Gas: 132,599 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

786 BBL/mo

Di (annual)

355.3%

b-factor

1.2

EUR

19,207 BBL

R-squared

0.512

type

hyperbolic

Operator History (from monthly production reports)

2013-03 — 2026-07 E P C OIL & GAS, INC. 161 mo

1997-10 — 2013-02 CHMELAR, EUGENE OIL & GAS 185 mo

1993-01 — 1997-09 VALIDUS OPERATING INC. 57 mo

Wells (1)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
1	42-051-30948	E P C OIL & GAS, INC.	1	8,600	1980-08-19