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:
Jul. 13, 1976
Filed:
Sep. 19, 1974
Applicant:
Inventors:
Herbert C Walther, Jr, Ponca City, OK (US);
George M Myers, Houston, TX (US);
Assignee:
Continental Oil Company, Ponca City, OK (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175 48 ; 166 67 ; 1662 / ; 73155 ;
Abstract
A method for determining when formation fluids enter the borehole during drilling of a well wherein a bypass is provided in the drill string above the back pressure valve and the pressure at the surface downstream of the mud pump is determined.