DUFF, A. H. ESTATE

Oil // district 9 // lease#7973

op: UNION PACIFIC RESOURCES COMPANY

cum_oil

55k BBL

cum_gas

0 MCF

wells

6

production

1993-01 — 2026-03

peak_month

1993-02

-- production_history

cum_oil: 55,479 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

337 BBL/mo

Di (annual)

7.5%

b-factor

0.0

EUR

52,916 BBL

R-squared

0.629

type

exponential

-- wells (6)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
8TREK RESOURCES, INC.26,8002006-08-31
6CHAMPLIN PETROLEUM CO.37,0001983-05-16
7CHAMPLIN PETROLEUM CO.17,0001980-04-08
5CHAMPLIN PETROLEUM CO.17,0001980-01-24
4CHAMPLIN PETROLEUM CO.17,0001979-11-26
2CHAMPLIN PETROLEUM CO.17,0001979-07-24
EOF // data source: Texas Railroad Commission // 2026