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:
Oct. 31, 1989
Filed:
Sep. 20, 1988
Applicant:
Inventor:
Gary D Zunkel, Chickasha, OK (US);
Assignee:
Halliburton Company, Duncan, OK (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
166106 ; 166187 ; 166191 ; 166321 ; 166326 ;
Abstract
A pressure limiter for use with a positive displacement pump and an inflatable packer. The pressure limiter includes an outer housing with an inner mandrel disposed therein. Slidably disposed between the mandrel and housing is a generally annular piston. A spring biases the piston toward a closed position. Packer pressure acts upwardly on the piston tending to move it to an open position in which pump discharge pressure is relieved to a well annulus. A check valve prevents premature relief of pressure of the packer. Once the piston is in an open position, packer pressure will maintain it in the open position until pressure is relieved from the packer.