BROWNLEE-COOK 127

Oil // district 14 // lease#8428

op: HIGHMARK ENERGY OPERATING, LLC

cum_oil

300k BBL

cum_gas

0 MCF

wells

4

production

2010-09 — 2026-03

peak_month

2011-01

-- production_history

cum_oil: 300,194 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

12,708 BBL/mo

Di (annual)

183.4%

b-factor

0.7

EUR

231,113 BBL

R-squared

0.910

type

hyperbolic

-- wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
5HEOG RESOURCES, INC.19,0002010-06-18
3HEOG RESOURCES, INC.19,0002010-06-17
4HEOG RESOURCES, INC.19,0002010-06-17
2HEOG RESOURCES, INC.19,0002010-03-04
EOF // multi-state drilling data platform // 2026