MASTEN UNIT

Oil · District 8A · Lease #67253

Operator: UNION OIL COMPANY OF CALIFORNIA

Fields: LEVELLAND

Cum Oil

965k BBL

Cum Gas

3.8M MCF

casinghead

Wells

63

Production

1994-07 — 2026-03

Peak Month

1995-06

Production History

Cum Oil: 965,353 BBL Cum Gas: 3,751,654 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,331 BBL/mo

Di (annual)

5.2%

b-factor

0.0

EUR

707,830 BBL

R-squared

0.628

type

exponential

Operator History (from monthly production reports)

2025-07 — 2026-07 TALIS ENERGY INC. 13 mo
2023-07 — 2025-06 OILWELL OPERATORS, INC. 24 mo
2020-05 — 2023-06 RMB OPERATING LLC 38 mo
2015-09 — 2020-04 STEWARD ENERGY II, LLC 56 mo
2006-04 — 2015-08 CHEVRON MIDCONTINENT, L.P. 113 mo
2000-06 — 2006-03 PURE RESOURCES, L.P. 70 mo
1994-07 — 2000-05 UNION OIL COMPANY OF CALIFORNIA 71 mo

Wells (63)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
A 22TALIS ENERGY INC.29,0002016-01-05
C 5TALIS ENERGY INC.19,0002015-12-30
H 5BTALIS ENERGY INC.35,0002001-06-21
B 3RTALIS ENERGY INC.15,1001994-03-23
20TALIS ENERGY INC.15,1001994-03-22
A 20TALIS ENERGY INC.15,1001994-03-22
A 21TALIS ENERGY INC.15,1001994-03-22
J 21TALIS ENERGY INC.15,1001994-03-22
A 7RTALIS ENERGY INC.15,1001994-03-16
D 5TALIS ENERGY INC.15,1001994-03-16
J 17RTALIS ENERGY INC.15,1001994-03-16
J 22TALIS ENERGY INC.15,1001994-03-16
J 11RTALIS ENERGY INC.15,1001994-02-09
J 3RTALIS ENERGY INC.15,1001994-02-09
J 7RTALIS ENERGY INC.15,1001994-02-09
J 2RTALIS ENERGY INC.15,1001994-02-08
C 4TALIS ENERGY INC.15,1001994-01-10
J 19TALIS ENERGY INC.15,1001994-01-07
J 20TALIS ENERGY INC.15,1001994-01-07
A 5RTALIS ENERGY INC.15,1001994-01-06
D 6TALIS ENERGY INC.15,1001994-01-05
D 7TALIS ENERGY INC.15,1001994-01-05
B 4TALIS ENERGY INC.15,1001993-12-31
A 19TALIS ENERGY INC.15,1001993-12-16
D 2TALIS ENERGY INC.15,1001993-12-16
J 5TALIS ENERGY INC.24,9451979-12-11
D 4TALIS ENERGY INC.25,0001979-11-28
A 15TALIS ENERGY INC.25,0001979-10-25
A 17TALIS ENERGY INC.25,0001979-10-25
A 16TALIS ENERGY INC.15,0001978-09-08
A 18TALIS ENERGY INC.15,0001978-09-08
A 14TALIS ENERGY INC.15,0001978-08-25
C 3TALIS ENERGY INC.15,0001978-08-21
B 2TALIS ENERGY INC.14,9251978-01-04
C 2TALIS ENERGY INC.14,9251978-01-04
D 3TALIS ENERGY INC.14,9251978-01-04
J 18TALIS ENERGY INC.14,9251978-01-04
A 142-079-01582TALIS ENERGY INC.------
A 1142-079-01297TALIS ENERGY INC.------
A 1342-079-30404TALIS ENERGY INC.------
A 242-079-01583TALIS ENERGY INC.------
A 342-079-01585TALIS ENERGY INC.------
A 442-079-01586TALIS ENERGY INC.------
B 142-079-01576TALIS ENERGY INC.------
C 142-079-01577TALIS ENERGY INC.------
C 1F42-079-01293TALIS ENERGY INC.------
C 2F42-079-01294TALIS ENERGY INC.------
D 142-079-01578TALIS ENERGY INC.------
G 242-079-01580TALIS ENERGY INC.------
H 242-079-01302TALIS ENERGY INC.------
H 2S42-079-01302TALIS ENERGY INC.------
H 342-079-01303TALIS ENERGY INC.------
H 3S42-079-01303TALIS ENERGY INC.------
J 1042-079-01774TALIS ENERGY INC.------
J 1342-079-01593TALIS ENERGY INC.------
J 1442-079-01298TALIS ENERGY INC.------
J 1542-079-01299TALIS ENERGY INC.------
J 1642-079-01300TALIS ENERGY INC.------
J 1R42-079-01581TALIS ENERGY INC.------
J 842-079-01547TALIS ENERGY INC.------
J 942-079-00033TALIS ENERGY INC.------
K 142-079-01293TALIS ENERGY INC.------
K 242-079-01294TALIS ENERGY INC.------