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. 07, 1988
Filed:
Oct. 22, 1986
Jon B Christensen, Duncan, OK (US);
Halliburton Company, Duncan, OK (US);
Abstract
A string bypass for bypassing fluid around a packer as a testing string is lowered into or raised out of a well bore. The string bypass includes an outer case with an inner mandrel positioned therein such that an annular cavity is defined therebetween. A reciprocating piston is positioned in the annular cavity. The case and mandrel both define transverse holes therethrough, and the piston includes a transverse passageway which provides intercommunication between the holes when the piston is in an open position. A spring biases the piston toward the open position. A pump is used to inflate the packer, and, as the pump pressure gradually increases, a differential between the pump pressure and well annulus pressure acts against an annular area on the piston and overcomes the spring force so that the piston is moved to a sealed, closed position in which communication between the holes is prevented. The piston also includes a substantially longitudinal passageway therethrough which provides continuous fluid communication between the pump above the string bypass and the packer below the string bypass.