BLACK STONE '21'

Oil · District 10 · Lease #8813

Operator: MEWBOURNE OIL COMPANY

Cum Oil

185k BBL

Cum Gas

1.3M MCF

casinghead

Wells

2

Production

2012-09 — 2026-04

Peak Month

2013-01

Production History

Cum Oil: 184,896 BBL Cum Gas: 1,333,680 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

4,782 BBL/mo

Di (annual)

219.3%

b-factor

1.0

EUR

123,226 BBL

R-squared

0.486

type

hyperbolic

Operator History (from monthly production reports)

2012-09 — 2026-07 MEWBOURNE OIL COMPANY 167 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2HMEWBOURNE OIL COMPANY27,5002012-10-10
1HMEWBOURNE OIL COMPANY17,5002012-05-30