CALVERT

Oil // district 1 // lease#16076

op: BLACKBRUSH O & G, LLC

cum_oil

93k BBL

cum_gas

0 MCF

wells

3

production

2011-06 — 2026-03

peak_month

2011-07

-- production_history

cum_oil: 92,997 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

3,835 BBL/mo

Di (annual)

461.2%

b-factor

1.5

EUR

120,378 BBL

R-squared

0.561

type

hyperbolic

-- wells (3)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
3HBLACKBRUSH O & G, INC.26,5002012-02-08
2HBLACKBRUSH O & G, INC.17,5002011-08-24
1HBLACKBRUSH O & G, INC.16,5002011-05-19
EOF // data source: Texas Railroad Commission // 2026