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. 31, 1981
Filed:
May. 16, 1979
Thomas E McGraw, Caracas, VE;
John C Zimmerman, Duncan, OK (US);
Halliburton Company, Duncan, OK (US);
Abstract
An improved bypass valve for use with an oil well testing string is disclosed which includes a check valve means for allowing fluid flow from the interior of the test string to the well annulus when the interior pressure exceeds the well annulus pressure. The bypass valve further includes a blocking means which blocks interior communication with the check valve means when the well annulus pressure exceeds the string interior pressure. A delay means is included which delays the action of the blocking means for a predetermined length of time. The improved bypass valve is intended for use in a testing string for an oil well, and is to be placed in the testing string below a normally closed tester valve and above a seal assembly for insertion into sealing engagement with a preset production type packer. The time delay allows the seal assembly to be removed from the packer after the packer location is determined without activating the blocking means to move to its locked closed position.