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:
Sep. 06, 1994
Filed:
Aug. 24, 1993
Dhirajlal C Patel, Carrollton, TX (US);
Tommy F Grigsby, Plano, TX (US);
Halliburton Company, Houston, TX (US);
Abstract
A recirculating tool assembly is lowered on a length of coil tubing into the production tubing of a well completion to a location above side wall perforations in the production tubing which have become obstructed. The tool assembly includes an upper tool portion telescoped into and releasably latched within a lower sealing and tubing extension portion. Recirculating fluid is pumped down the coil tubing, flowed through a first tool assembly passage, and downwardly discharged into the production tubing. A portion of the discharged fluid is forced outwardly through the production tubing perforations to remove the obstructions therefrom, and the remainder of the discharged fluid is forced upwardly through a second tool assembly passage into the annulus between the coil tubing and the production tubing for return to the surface. After this recirculation process is completed the upper tool assembly portion is unlatched from the lower assembly portion, using fluid pressure within the coil tubing, and removed from the production tubing. An alternate embodiment of the tool assembly is used to form a gravel pack internally around additional perforations formed in the production tubing before the tool assembly is lowered into place therein. After the upper tool assembly portion is unlatched and removed, production fluid flows into the production tubing through these additional perforations and then flows into the lower portion of the tool assembly, through a sand screen structure carried thereon, for delivery to the surface.