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:
Mar. 01, 1993
Filed:
Nov. 20, 1991
Applicant:
Inventor:
Robert W Siegfried, II, Richardson, TX (US);
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01V / ;
U.S. Cl.
CPC ...
367 31 ; 367 35 ; 367 75 ; 181102 ; 181105 ;
Abstract
In the present invention, characteristics of fractures or microcracks in earth formations surrounding a borehole are detected by use of conventional sonic logging devices used in combination with internal variations of wellborne pressure. A sonic logging tool is first used to generate a log of acoustic velocity at a first pressure. Borehole pressure is then changed and a second log is obtained. Significant changes in formation velocity in response to the pressure change indicates the presence of fractures.