Packer and method for fixation thereof in a well

Abstract

The invention relates to the oil industry and can be used for increasing well productivity by increasing the oil flowrate, for a well workover and isolation of a water-encroached bench. The inventive packer ( 1 ) comprises a body ( 4 ) provided with a scaling ring ( 5 ) which is collapsible in a radial direction and fitted with a drive. Said drive is embodied in the form of a chamber ( 6 ) containing a working medium in an such initial aggregative state in which it occupies a minimum volume, and comprises an element transferring the working medium from the initial state to another state. In order to fix the packer ( 1 ) in the well, the working medium of the drive of the sealing ring is transferred from the initial aggregative state to another state, where the working medium occupies a greater volume.

1 . A packer comprising a body with a seal cup expandable in a radial direction, provided with a drive, characterized in that the drive of the seal cup is made as a chamber with a working medium in such initial aggregate state that it occupies a minimum volume, and an element that brings the working medium from the initial aggregate state to another.  
     
     
         2 . The packer of  claim 1 , characterized in that the chamber of the drive of the seal cup is divided into a preparatory part for accommodating a working medium in its initial aggregate state and the element that brings the working medium from its initial aggregate state to another, and at least one working part in which the working medium acts on the seal cup, the parts of the chamber being interconnected by at least one duct.  
     
     
         3 . The packer of claims  1  or  2 , characterized in that a liquid is used as the working medium and a heater or a cooler is used as the element bringing the working medium from its initial aggregate state to another.  
     
     
         4 . The packer of any one of  claims 1  to  3 , characterized in that the seal cup comprises a member interacting with the working part of the chamber and several other members encompassing said interacting member, all said members being arranged coaxially.  
     
     
         5 . A method of fixing a packer in a well comprising lowering the packer into the well to a required depth, increasing the diameter of the packer, and deforming its seal cup in a radial direction, characterized in that the working medium of the drive of the seal cup is brought from its initial aggregate state, in which the working medium occupies a minimum volume, to another aggregate state, in which the working medium occupies a larger volume.  
     
     
         6 . A method of  claim 5  characterized in that bringing the working medium to another aggregate state is effected by heating the working medium in the form of a liquid to a temperature not lower than the boiling point thereof.  
     
     
         7 . A method of claim  13 , characterized in that bringing the working medium to another aggregate state is effected by cooling the working medium in the form of a liquid to a temperature not higher than the freezing point thereof.