YORK, W. A. 13

Oil // district 5 // lease#1214

op: UNION OIL COMPANY OF CALIFORNIA

fields: VAN

cum_oil

728k BBL

cum_gas

0 MCF

wells

11

production

1993-01 — 2026-03

peak_month

1994-10

-- production_history

cum_oil: 727,714 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

6,780 BBL/mo

Di (annual)

37.4%

b-factor

0.9

EUR

595,783 BBL

R-squared

0.752

type

hyperbolic

-- wells (11)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
20UNION OIL COMPANY OF CALIFORNIA33,0502026-02-27
18UNION OIL COMPANY OF CALIFORNIA23,0782021-06-25
8UNION OIL COMPANY OF CALIFORNIA23,1022016-01-07
6UNION OIL COMPANY OF CALIFORNIA13,0772005-08-08
5UNION OIL COMPANY OF CALIFORNIA13,0101994-08-31
12UNOCAL EXPLORATION CORPORATION13,1001990-11-09
10UNION EXPL. PARTNERS, LTD.13,0301990-05-03
9UNION EXPL. PARTNERS, LTD.13,0501989-11-08
242-467-00553--------
342-467-80108--------
442-467-00555--------
EOF // data source: Texas Railroad Commission // 2026