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:
Feb. 09, 1993
Filed:
Apr. 15, 1991
Applicant:
Inventor:
Robert Desbrandes, Baton Rouge, LA (US);
Assignee:
Louisiana State University and Agricultural and Mechanical College, Baton Rouge, LA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
73152 ; 73153 ; 166264 ;
Abstract
A method for accurately determining the formation pressure of earth formans. Formation measurements are made with by use of a novel downhole tool which allows drilling mud to enter the tool in such a way that decompression of drilling mud is controlled so that the pressure in the borehole is allowed to fall only slightly below the formation pressure. The drawdown of mud into the tool is then stopped and the pressure is allowed to stabilize at the formation pressure. The measurement is completed in a matter of a few minutes as opposed to hours, or even days, as required by more conventional techniques.