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. 08, 1983
Filed:
Feb. 27, 1981
Applicant:
Inventors:
Michael B Smith, Tulsa, OK (US);
Kenneth G Nolte, Tulsa, OK (US);
Assignee:
Standard Oil Company (Indiana), Chicago, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
166250 ; 73155 ; 166308 ;
Abstract
A method of determining the minimum in-situ stress of an underground formation penetrated by a well. The method includes injecting a fluid at a certain rate into the formation to produce fractures in the formation, backflowing the injected fluid from the well at a rate less than the injection rate, and measuring the well fluid pressure decrease during the backflow to establish the pressure at which the fractures close.