Method and packer for processing a productive formation in bottom-hole zone of a well, and method for fixing a packer inside a well

Abstract

The proposed method for processing the productive formation in a bottom-hole zone of a well ( 1 ) comprises heating the liquid in the bottom-hole zone of a well ( 1 ) and removing clogging products therefrom. In accordance with the technical solution, the upper part of the bottom-hole zone of the well ( 1 ) is sealed before heating the liquid, thus forming a bottom-hole chamber ( 6 ), and after the heating, the liquid within the volume of the bottom-hole chamber ( 6 ) is cooled and then this chamber ( 6 ) is unsealed before removing the clogging products therefrom. In the proposed packer ( 4 ) for processing the productive formation in the bottom-hole zone of a well ( 1 ), comprising a body ( 10 ) with a means for radial compaction in the form of sliding cheeks, a cup-type seal ( 15 ) and a drive, and a suspension means ( 2 ), in accordance with the technical solution, the lower end face ( 5 ) is made in the form of a concave surface of the second order. A method for fixing a packer ( 4 ) in a well ( 1 ), comprising lowering it into the well ( 1 ) to a required depth, increasing the diametral size of the packer ( 4 ) and deforming its cup-type seal ( 15 ) in a radial direction, wherein in accordance with the technical solution, the packer ( 4 ) is subjected to temperature action different from the temperature of the well liquid at the point of its installation. 19 dependent claims, 15 drawings.

1 . A method for processing a productive formation in a bottom-hole zone of a well ( 1 ), comprising heating liquid in the bottom-hole zone and removing clogging products from the bottom-hole zone, characterized in that a temperature-action element ( 14 ) for heating the liquid to a temperature above the boiling point of its components is lowered into the bottom-hole zone with use of a suspension means ( 2 ), a bottom-hole chamber ( 6 ) is formed in the bottom-hole zone of the well ( 1 ), an upper portion of the chamber higher than the positioning of the temperature-action element ( 14 ) is sealed by a packer ( 4 ), after being heated the liquid is cooled, wherein heating the liquid and cooling it is carried out within the volume of the bottom-hole chamber ( 6 ), then the bottom-hole chamber ( 6 ) is unsealed by removal of the packer ( 4 ), after which the clogging products together with oil products are removed from the bottom-hole zone.  
     
     
         2 . A method according to  claim 1 , characterized in that the liquid in the bottom-hole chamber ( 6 ) is heated to a temperature above the boiling point of one of the light oil fractions, e.g., gasoline.  
     
     
         3 . A method according to  claim 1 , characterized in that the liquid in the bottom-hole chamber ( 6 ) is heated to a temperature above the boiling point of water.  
     
     
         4 . A method according to  claim 1 , characterized in that the liquid in the bottom-hole chamber ( 6 ) is heated to a temperature above the boiling point of one of the heavy oil fractions, e.g., oils.  
     
     
         5 . A method according to any one of claims  1 - 4 , characterized in that the liquid in the bottom-hole chamber ( 6 ) is heated instantly, e.g., by an explosion.  
     
     
         6 . A method according to any one of claims  1 - 5 , characterized in that cooling the liquid within the volume of the bottom-hole chamber ( 6 ) is carried out in a forced manner with the use of, for example, thermocouples.  
     
     
         7 . A method according to any one of claims  1 - 5 , characterized in that cooling the liquid within the volume of the bottom-hole chamber ( 6 ) is carried out in a forced manner, feeding cold water from the surface.  
     
     
         8 . A method according to any one of claims  1 - 7 , characterized in that a column of well liquid in the bottom-hole chamber ( 6 ) is divided into two parts by the packer ( 4 ) with at least one channel ( 12 ) connecting its end faces and with a back-pressure valve ( 13 ), wherein one of the parts of the column of well liquid is directed toward the bottom-hole zone of the well ( 1 ) for hydraulic fracturing, the other part is removed through the channel ( 12 ) of the packer ( 4 ), and movement of the well liquid through that channel ( 12 ) toward the bottom-hole chamber ( 6 ) from the above-packer space of the well is closed.  
     
     
         9 . A method according to  claim 8 , characterized in that after removal of a part of the column of well liquid from the bottom-hole chamber ( 6 ) through the packer ( 4 ), the pressure in the upper part thereof is reduced and simultaneously the bottom-hole chamber ( 6 ) is filled with formation liquid.  
     
     
         10 . A packer ( 4 ) for processing a productive formation in a bottom-hole zone of a well ( 1 ), comprising a body ( 10 ) with a means for radial compaction in the form of sliding cheeks, a cup-type seal ( 15 ) and a drive, and a suspension means ( 2 ), characterized in that its lower end face ( 5 ) is made in the form of a concave surface of the second order.  
     
     
         11 . A packer ( 4 ) according to  claim 10 , characterized in that the concave surface of the second order is made hemispherical.  
     
     
         12 . A packer ( 4 ) according to  claim 10 , characterized in that the concave surface of the second order is made paraboloidal.  
     
     
         13 . A packer ( 4 ) according to any one of claims  10 - 12 , characterized in that in the case where a pressure generator ( 8 ) is used in the well ( 1 ), including with an explosive, the packer ( 4 ) has at least one channel ( 12 ) connecting its end faces, and a back-pressure valve ( 13 ) is mounted with the possibility for passage of a flow of well liquid from a bottom-hole chamber ( 6 ) through the channel ( 12 ) of the packer ( 4 ) into above-packer space due to the action of pressure generator ( 8 ) gases, and for elimination of movement of the well liquid from the above-packer space into the bottom-hole chamber ( 6 ) with closure of the channel ( 12 ) under the action of a column of liquid in the above-packer space and depression in the bottom-hole chamber ( 6 ).  
     
     
         14 . A packer ( 4 ) according to  claim 13 , characterized in that the back-pressure valve ( 13 ) is made in the form of an elastic plate secured in its central part to the body of the packer ( 4 ).  
     
     
         15 . A packer ( 4 ) according to  claim 13  or  claim 14 , characterized in that the back-pressure valve ( 13 ) is mounted in its channel ( 12 ).  
     
     
         16 . A packer ( 4 ) according to  claim 15 , characterized in that the channel ( 12 ) connecting its end faces is made in the body of the packer ( 4 ), and the back-pressure valve ( 13 ) is mounted from the side of its upper end face.  
     
     
         17 . A packer ( 4 ) according to any one of claims  10 - 16 , characterized in that its sliding cheeks are made in the form of a cylinder ( 19 ) with longitudinal slots ( 21 ), ending with openings ( 27 ), wherein longitudinal parts of the cylinder (  19 ) between tie slots ( 21  ) are made in the form of lobes ( 20 ) of a material with shape memory.  
     
     
         18 . A packer ( 4 ) according to  claim 17 , characterized in that it has a temperature-action element ( 14 ) in the form of a cooler to reduce the temperature of packer ( 4 ) elements when electric power is applied to the cooler.  
     
     
         19 . A packer ( 4 ) according to  claim 18  characterized in that it is additionally provided with a heater, for example, a pyrotechnic cartridge or an electric spiral.  
     
     
         20 . A method for fixing a packer ( 4 ) in a well ( 1 ), comprising lowering the packer ( 4 ) into the well ( 1 ) to a required depth increasing diametral size of the packer ( 4 ) by changing the shape of sliding cheeks during reverse martensite conversion of material with shape memory, deforming its cup-type seal ( 15 ) in a radial direction, subjecting the packer ( 4 ) to temperature action, different from the temperature of the well liquid at the point of its installation, characterized in that the temperature action on the packer ( 4 ) is carried out by reducing the temperature to a temperature below the temperature of the well liquid at the point of installation of the packer ( 4 ) prior to lowering the packer ( 4 ) to the required depth.  
     
     
         21 . A method according to claim  20 . characterized in that temperature relief of the packer ( 4 ) is carried out after temperature action on the packer ( 4 ) at the point of its installation in the well ( 1 ) at the required depth.