SOURDOUGH C21-9 UNIT

Oil · District 08 · Lease #47603

Operator: COTERRA ENERGY OPERATING CO.

Cum Oil

544k BBL

Cum Gas

3.0M MCF

casinghead

Wells

1

Production

2016-01 — 2026-04

Peak Month

2016-03

Production History

Cum Oil: 543,740 BBL Cum Gas: 3,008,304 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

20,681 BBL/mo

Di (annual)

134.7%

b-factor

1.0

EUR

778,386 BBL

R-squared

0.971

type

hyperbolic

Operator History (from monthly production reports)

2025-11 — 2026-07 COTERRA ENERGY OPERATING CO. 9 mo
2016-01 — 2025-10 CIMAREX ENERGY CO. 118 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1HCOTERRA ENERGY OPERATING CO.111,7002015-06-24