Method for forming an isolating plug

Abstract

Method of the subject disclosure can be used in the oil and gas production industry, in particular, for plugging fractures in the near-wellbore zone during the fracturing fluid removal, as well as for plugging different kinds of fractures and branches in the casing. For formation of an isolating-plug, a catch is placed upstream of the point where the isolating plug shall be formed, so as to prevent the passing of fibers and to promote the forming of fiber aggregates. A fluid containing dispersed fibers is then injected into a well, and the catch is periodically opened to release the fiber aggregates and to allow their free flow to the location where the plug shall be formed.

1 . A method for forming an insulating plug, comprising the following steps:
 placing a catch upstream of a location of the insulating plug being formed, the catch preventing passing of fibers and promoting fiber aggregates forming;   injecting a fluid containing dispersed fibers into a well, and   periodically opening the catch to release the formed fiber aggregates and to allow their free flow to the location of the insulating plug being formed.   
     
     
         2 . The method of  claim 1  wherein the catch is made as a grid which can be periodically removed during the fluid injection process. 
     
     
         3 . The method of  claim 1  wherein the catch is made as a rotatable plate disposed across the fluid flow, some sections of which are provided with holes, allowing the fluid passing but preventing passing of fibers, the others sections are open. 
     
     
         4 . The method of  claim 1  wherein the catch is made as an element disposed across the fluid flow allowing the fluid passing but preventing passing of fibers and promoting fiber aggregates forming. 
     
     
         5 . The method of  claim 1  wherein the fluid is a fracturing fluid.