UNDERWOOD

Oil // district 1 // lease#11691

op: THREE FORKS OPERATING CO, LLC

cum_oil

366k BBL

cum_gas

0 MCF

wells

14

production

1993-01 — 2026-03

peak_month

1998-12

-- production_history

cum_oil: 365,623 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

1,448 BBL/mo

Di (annual)

5.0%

b-factor

0.0

EUR

320,204 BBL

R-squared

0.495

type

exponential

-- wells (14)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
15SHELDON RESOURCES, L.P.12,0252017-12-19
16SHELDON RESOURCES, L.P.12,0252017-12-19
13THREE FORKS OPERATING CO, LLC12,1002009-09-17
14THREE FORKS OPERATING CO, LLC22,0252008-10-04
11HEARTLAND RESOURCES, INC.11,9952003-11-12
12HEARTLAND RESOURCES, INC.12,0001997-01-21
10SHELDON RESOURCES, L.P.22,0001997-01-17
93R-B OIL VENTURE12,4501994-04-28
83R-B OIL VENTURE12,0501994-04-07
73R-B OIL VENTURE11,9251992-11-04
63R-B OIL VENTURE11,9251992-04-06
53R-B OIL VENTURE12,0501991-05-15
43R-B OIL VENTURE23,0001990-05-24
2HEARTLAND RESOURCES, INC.13,0001986-10-10
EOF // data source: Texas Railroad Commission // 2026