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. 25, 1995
Filed:
Jun. 01, 1994
Michael C Robertson, Alvarado, TX (US);
MCR Corporation, Alvarado, TX (US);
Abstract
An apparatus for cutting pipe disposed in a string down a borehole of an oil or gas well, including an elongated body for lowering into the bore of the string and defining an annulus between the body and the pipe wall, a quantity of combustible material supported within the elongated body, for providing a cutting flame when the material is ignited, a nozzle to direct the cutting flame radially outward from the body against the wall of the pipe to be cut, and an anchor supported along the lower end of the body, of a desired length and diameter defining an annulus below the cutting nozzle, so that upon the ignition of the material, the pressure of the gases produced by the ignition which collect in the annulus formed by the anchor below the nozzle is substantially equal to the gas pressure in the annulus formed by the body, and the cutting nozzle is maintained at a stable point within the hole to produce an even cut. The cutting device used in the method of the present invention may also include a chemical cutting device.