YORK, W. A. 13

Oil // district 5 // lease#3169

op: UNION OIL COMPANY OF CALIFORNIA

cum_oil

476k BBL

cum_gas

0 MCF

wells

11

production

1993-01 — 2026-03

peak_month

1994-12

-- production_history

cum_oil: 476,183 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

13,259 BBL/mo

Di (annual)

101.6%

b-factor

0.5

EUR

301,553 BBL

R-squared

0.858

type

hyperbolic

-- wells (11)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
18UNION OIL COMPANY OF CALIFORNIA23,0782021-06-25
16UNOCAL EXPLORATION CORPORATION22,9002005-04-22
17UNION OIL COMPANY OF CALIFORNIA22,4052005-03-30
14UNOCAL EXPLORATION CORPORATION22,9002005-03-28
11UNION OIL COMPANY OF CALIFORNIA23,2502002-10-04
1UNION OIL COMPANY OF CALIFORNIA32,9442002-04-09
19UNION OIL COMPANY OF CALIFORNIA12,5501994-10-13
5UNION OIL COMPANY OF CALIFORNIA13,0101994-08-31
15UNOCAL EXPLORATION CORPORATION12,9001992-01-22
13UNOCAL EXPLORATION CORPORATION12,9001991-07-29
7UNION EXPL. PARTNERS, LTD.12,3301989-02-24
EOF // data source: Texas Railroad Commission // 2026