THUNDERBOLT C21-9 UNIT

Oil · District 08 · Lease #46765

Operator: COTERRA ENERGY OPERATING CO.

Cum Oil

551k BBL

Cum Gas

2.9M MCF

casinghead

Wells

1

Production

2015-07 — 2026-04

Peak Month

2015-10

Production History

Cum Oil: 551,109 BBL Cum Gas: 2,919,974 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

15,555 BBL/mo

Di (annual)

103.8%

b-factor

1.2

EUR

895,990 BBL

R-squared

0.907

type

hyperbolic

Operator History (from monthly production reports)

2025-11 — 2026-07 COTERRA ENERGY OPERATING CO. 9 mo
2015-07 — 2025-10 CIMAREX ENERGY CO. 124 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1HCOTERRA ENERGY OPERATING CO.111,3402015-03-03