STEPHEN UNIT

Oil // district 8 // lease#27652

op: UPHAM OIL & GAS COMPANY

cum_oil

189k BBL

cum_gas

0 MCF

wells

17

production

1995-10 — 2026-03

peak_month

2001-04

-- production_history

cum_oil: 189,247 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

4,395 BBL/mo

Di (annual)

55.3%

b-factor

0.4

EUR

155,105 BBL

R-squared

0.767

type

hyperbolic

-- wells (17)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
401UPHAM OIL & GAS COMPANY36,0002011-02-07
105UPHAM OIL & GAS COMPANY24,2502003-07-17
504UPHAM OIL & GAS COMPANY14,0002002-07-03
202WUPHAM, CHESTER R., JR.14,0001996-01-03
306WUPHAM, CHESTER R., JR.14,0001995-11-29
104WUPHAM, CHESTER R., JR.14,0001995-11-14
4015WUPHAM, CHESTER R., JR.14,0001995-11-01
103UUPHAM, CHESTER R., JR.14,6001989-04-12
201UTUPHAM, CHESTER R., JR.14,5001988-09-14
503UPHAM, CHESTER R., JR.14,5001987-12-18
305UPHAM, CHESTER R., JR.14,6001987-11-23
407UPHAM, CHESTER R., JR.14,6001987-08-27
502UPHAM, CHESTER R., JR.14,6001987-08-05
304UPHAM, CHESTER R., JR.14,5001987-05-05
301UPHAM, CHESTER R., JR.24,3001987-04-15
101UPHAM, CHESTER R., JR.14,3001986-09-22
501UPHAM, CHESTER R., JR.14,3001986-08-27
EOF // data source: Texas Railroad Commission // 2026