Minimizing clay and shale damage in a log-inject-log procedure

Details Minimizing clay and shale damage in a log-inject-log procedure Minimizing clay and shale damage in a log-inject-log procedure

1980-06-13

1981-08-04

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

73152, 250259, E21B 4700, E21B 4900

Patent

active

042817129

ABSTRACT:
This invention relates to a method of determining oil saturation in an underground rock formation penetrated by a wellbore by use of a log-inject-log technique. In such techniques, thermal neutron decay time logs are taken with the formation in the native state and then again after fresh water has been injected into the formation. These logs determine water saturations which are used to determine oil saturation. The method of this invention is directed to a method to prepare an aqueous salt solution so that clay and shale impairment of the formation is prevented but such that the thermal neutron capture cross section of the injected fresh water is not significantly different from that of the fresh water typically used.

REFERENCES:
patent: 3631245 (1971-12-01), Jorden, Jr. et al.
patent: 3748474 (1973-07-01), Murphy
patent: 3783683 (1974-01-01), Murphy et al.
patent: 4173718 (1979-11-01), Fertl
patent: 4191883 (1980-03-01), Albright et al.

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