CHALK, OTIS

Oil · District 08 · Lease #19011

Operator: UNION OIL COMPANY OF CALIFORNIA

Cum Oil

738k BBL

Cum Gas

243k MCF

casinghead

Wells

28

Production

1993-01 — 2011-11

Peak Month

1995-05

Production History

Cum Oil: 737,993 BBL Cum Gas: 242,864 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

5,529 BBL/mo

Di (annual)

8.1%

b-factor

0.2

EUR

931,336 BBL

R-squared

0.839

type

hyperbolic

Operator History (from monthly production reports)

2011-01 — 2012-02 TRADITION RESOURCES LLC 14 mo
2006-04 — 2010-12 CHEVRON MIDCONTINENT, L.P. 57 mo
2000-06 — 2006-03 PURE RESOURCES, L.P. 70 mo
1993-01 — 2000-05 UNION OIL COMPANY OF CALIFORNIA 89 mo

Wells (28)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
10TRADITION RESOURCES LLC13,2362008-10-17
17TRADITION RESOURCES LLC13,1262008-10-17
21UNITEX OIL & GAS, L.L.C.12,6001994-10-18
L 11WRUNITEX OIL & GAS, L.L.C.13,2501993-06-25
L 9WRUNITEX OIL & GAS, L.L.C.13,2501993-06-25
42UNITEX OIL & GAS, L.L.C.13,2001993-01-07
2RUNITEX OIL & GAS, L.L.C.13,2001992-09-22
3RUNITEX OIL & GAS, L.L.C.13,2001992-08-28
40UNITEX OIL & GAS, L.L.C.23,2051992-01-08
5UNITEX OIL & GAS, L.L.C.13,1321991-11-26
8UNITEX OIL & GAS, L.L.C.13,1791990-12-26
39UNITEX OIL & GAS, L.L.C.13,1001984-11-19
142-227-02699UNITEX OIL & GAS, L.L.C.------
1142-227-02706TRADITION RESOURCES LLC------
1642-227-02711UNITEX OIL & GAS, L.L.C.------
1942-227-02714UNITEX OIL & GAS, L.L.C.------
1W42-227-30296TRADITION RESOURCES LLC------
2042-227-02715UNITEX OIL & GAS, L.L.C.------
2201W42-227-10173TRADITION RESOURCES LLC------
230142-227-10174TRADITION RESOURCES LLC------
250142-227-10176TRADITION RESOURCES LLC------
2W42-227-30358UNITEX OIL & GAS, L.L.C.------
4W42-227-30308UNITEX OIL & GAS, L.L.C.------
5W42-227-30309UNITEX OIL & GAS, L.L.C.------
6W42-227-30310UNITEX OIL & GAS, L.L.C.------
742-227-04274UNITEX OIL & GAS, L.L.C.------
8W42-227-30340TRADITION RESOURCES LLC------
942-227-04273TRADITION RESOURCES LLC------