Inventors:
Kerry D. Savage - Houston TX
Irwin R. Supernaw - Houston TX
Assignee:
Texaco Inc. - White Plains NY
International Classification:
E21B 4910
G01V 318
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.