Sampling resistivity of formation fluids in a well bore

Details Sampling resistivity of formation fluids in a well bore Sampling resistivity of formation fluids in a well bore

1989-09-25

1990-10-16

Strecker, Gerard R.

Measuring and testing

Borehole or drilling

Downhole test

324324, E21B 4910, G01V 318

Patent

active

049626655

ABSTRACT:
Formation fluid is received in and passed through a sonde supported by an armored well logging cable at a depth of interest in a well bore. Periodically, samples of the formation fluid are taken. Higher density portions of the fluid, which represent formation fluid and/or mud filtrate, are separated. The separated fluid is a sample from which the resistivity is measured. As sampling continues, the sample fluid becomes substantially formation fluid and an apparent R.sub.2 measurement is made. An electrical signal indicating the R.sub.2 at the depth of interest is sent to the surface for recording and further processing. R.sub.2 measurements can be taken at any desired number of depths of interest in the well bore.

REFERENCES:
patent: 2607222 (1952-08-01), Lane
patent: 3209588 (1965-10-01), Terry
patent: 3611799 (1971-10-01), Davis
patent: 4301679 (1981-11-01), Boyle et al.
patent: 4434653 (1984-03-01), Montgomery
"Repeat Formation Tester" Brochure, Schlumberger, 1986, pp. 1-4.
"Essentials of Modern Open-Hole Log Interpretation", PennWell Publishing Co., Tulsa, Okla., 1983, pp. 284-290.

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