UNDERWOOD

Oil · District 01 · Lease #11691

Operator: THREE FORKS OPERATING CO, LLC

Cum Oil

366k BBL

Cum Gas

3k MCF

casinghead

Wells

14

Production

1993-01 — 2026-04

Peak Month

1993-06

Production History

Cum Oil: 366,473 BBL Cum Gas: 2,940 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,470 BBL/mo

Di (annual)

5.1%

b-factor

0.0

EUR

316,903 BBL

R-squared

0.500

type

exponential

Operator History (from monthly production reports)

2017-10 — 2026-07 SHELDON RESOURCES, L.P. 106 mo
2006-11 — 2017-09 THREE FORKS OPERATING CO, LLC 131 mo
1996-01 — 2006-10 HEARTLAND RESOURCES, INC. 130 mo
1993-01 — 1995-12 3R-B OIL VENTURE 36 mo

Wells (14)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
15SHELDON RESOURCES, L.P.12,0252017-12-19
16SHELDON RESOURCES, L.P.12,0252017-12-19
13SHELDON RESOURCES, L.P.12,1002009-09-17
14SHELDON RESOURCES, L.P.22,0252008-10-04
11SHELDON RESOURCES, L.P.11,9952003-11-12
12SHELDON RESOURCES, L.P.12,0001997-01-21
10SHELDON RESOURCES, L.P.22,0001997-01-17
9SHELDON RESOURCES, L.P.12,4501994-04-28
8SHELDON RESOURCES, L.P.12,0501994-04-07
7SHELDON RESOURCES, L.P.11,9251992-11-04
6SHELDON RESOURCES, L.P.11,9251992-04-06
5SHELDON RESOURCES, L.P.12,0501991-05-15
4SHELDON RESOURCES, L.P.23,0001990-05-24
2SHELDON RESOURCES, L.P.13,0001986-10-10