LONG

Oil // district 11 // lease#69854

op: SCHALK OIL COMPANY, INC.

cum_oil

19k BBL

cum_gas

0 MCF

wells

1

production

2012-01 — 2024-09

peak_month

2012-02

-- production_history

cum_oil: 19,415 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

993 BBL/mo

Di (annual)

138.4%

b-factor

0.7

EUR

23,307 BBL

R-squared

0.892

type

hyperbolic

-- wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4ASCHALK OIL COMPANY, INC.15,4002011-11-04
EOF // data source: Texas Railroad Commission // 2026