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:
Nov. 26, 1985
Filed:
Jun. 07, 1982
Roy R Vann, Houston, TX (US);
Flint R George, Katy, TX (US);
GEO VANN, Inc., Houston, TX (US);
Abstract
A hold down apparatus for a wireline operated perforating gun which prevents the gun from being thrust uphole when the gun is fired. The hold down apparatus enables the gun to be run downhole in a tubing or casing string, without the necessity of filling the pipe with liquid. The hold down apparatus includes a releasable anchor apparatus which is selectively set when the gun is manipulated vertically in a particular manner by the wireline. The gun is run downhole and positioned at the zone where the perforations are to be formed. The gun is lifted a finite distance, then lowered a finite distance, and then lifted again, thereby setting a pair of slips which are located in underlying relationship with respect to the gun. The gun remains anchored downhole so long as tension is maintained on the wireline. The gun is fired and subsequently released by lowering the gun a finite distance whereupon the anchoring device releases the slips from engagement with the piping. The gun can then be lifted uphole. Another zone can be perforated by again lowering the gun and then lifting the gun whereupon the anchor apparatus is again set. This manipulation of the gun with the wireline in order to release or set the anchor apparatus can be continued as many times as desired.