MARY HELEN UNIT

Oil // district 3 // lease#14976

op: U. S. OPERATING, INC.

cum_oil

141k BBL

cum_gas

0 MCF

wells

5

production

1993-01 — 2026-03

peak_month

2004-12

-- production_history

cum_oil: 141,390 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

3,444 BBL/mo

Di (annual)

89.8%

b-factor

0.5

EUR

88,128 BBL

R-squared

0.858

type

hyperbolic

-- wells (5)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4REU. S. OPERATING, INC.29,3002004-07-21
3U. S. OPERATING, INC.39,4002004-07-14
3REU. S. OPERATING, INC.39,4002004-07-14
2U. S. OPERATING, INC.39,3002001-03-14
2REU. S. OPERATING, INC.39,3002001-03-14
EOF // data source: Texas Railroad Commission // 2026