Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present

Patent · Sat Jan 01 00:00:00 EST 2000

OSTI ID:873428

Vail, III, William Banning ^[1]

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1. (Bothell, WA)

Methods to quantitatively determine the separate amounts of oil and gas in a geological formation adjacent to a cased well using measurements of formation resistivity. The steps include obtaining resistivity measurements from within a cased well of a given formation, obtaining the porosity, obtaining the resistivity of formation water present, computing the combined amounts of oil and gas present using Archie's Equations, determining the relative amounts of oil and gas present from measurements within a cased well, and then quantitatively determining the separate amounts of oil and gas present in the formation. Resistivity measurements are obtained from within the cased well by conducting A.C. current from within the cased well to a remote electrode at a frequency that is within the frequency range of 0.1 Hz to 20 Hz.

• Research Organization: ParaMagnetic Logging, Inc. (Bothell, WA)
• DOE Contract Number: FG06-84ER13294
• Assignee: Western Atlas International, Inc. (Houston, TX)
• Patent Number(s): US 6157195
• OSTI ID: 873428
• Country of Publication: United States
• Language: English

Related Subjects

formation
resistivity
measurements
cased
quantitatively
determine
amount
oil
gas
methods
separate
amounts
geological
adjacent
steps
obtaining
porosity
water
computing
combined
archie
equations
determining
relative
obtained
conducting
current
remote
electrode
frequency
range
hz
20
frequency range
formation resistivity
geological formation
resistivity measurements
formation adjacent
quantitatively determining
quantitatively determine
relative amounts
separate amounts
rate amounts
relative amount
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