The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 20, 1979
Filed:
Oct. 25, 1978
John H Striegler, Richardson, TX (US);
Atlantic Richfield Company, Los Angeles, CA (US);
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.