NAIL -33-

Oil // district 10 // lease#29780

op: VENCER ENERGY, LLC

cum_oil

286k BBL

cum_gas

0 MCF

wells

7

production

1993-01 — 2026-03

peak_month

1997-01

-- production_history

cum_oil: 285,851 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

1,477 BBL/mo

Di (annual)

6.8%

b-factor

0.0

EUR

250,684 BBL

R-squared

0.792

type

exponential

-- wells (7)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
8CONCHO RESOURCES INC.19,5001999-05-05
7COSTILLA PETROLEUM CORPORATION110,0001996-10-15
4COSTEX RESOURCES, INC.19,7001985-12-06
3COSTEX RESOURCES, INC.19,7501985-09-24
6COSTEX RESOURCES, INC.19,7501985-09-24
5XCOSTEX RESOURCES, INC.19,7001985-02-21
1COSTEX RESOURCES, INC.19,7001985-01-08
EOF // data source: Texas Railroad Commission // 2026