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:
Jun. 12, 1984
Filed:
Sep. 07, 1982
Applicant:
Inventors:
Peter L Lagus, Olivenhain, CA (US);
Edward W Peterson, Del Mar, CA (US);
Assignee:
Maxwell Laboratories, Inc., San Diego, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166250 ; 73155 ; 166308 ;
Abstract
A method is disclosed for accurately measuring breakdown or fracture pressure by placing a variable volume device in immediate communication with a test interval formed in a borehole extending through an underground formation. Expansion of the variable volume device increases pressure in the test interval to the fracture pressure of the formation. The fracture pressure may be accurately measured by monitoring pressure in the test interval, expansion of the variable volume device then preferably being terminated in order to minimize the extent of fracture within the formation.