Detection of drilling oil filtrate invasion in a core

Details Detection of drilling oil filtrate invasion in a core Detection of drilling oil filtrate invasion in a core

1978-10-25

1979-11-20

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

73 614, 175 40, E21B 4902

Patent

active

041746295

ABSTRACT:
During the analysis of sample oil from an oil bearing formation, drilling fluid oil filtrate invasion into a cored oil bearing subsurface formation is detected in a way that does not require the use of special chemicals or tracers. Significant oil filtrate invasion is detected by determining the relative quantities of the same two hydrocarbon materials in the formation oil, drilling oil, and sample oil. Preferably, each hydrocarbon material is one or more hydrocarbons selected from the group consisting of hydrocarbons with eight carbon atoms through hydrocarbons with thirty-five carbon atoms. The drilling oil may be topped crude oil or formation oil that has had most of the hydrocarbons with one carbon atom through six carbon atoms removed. Fuel oil may have been added to the topped oil.

REFERENCES:
patent: 2790016 (1957-04-01), Lanneau
patent: 3990298 (1976-11-01), Deans

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