SUBMERSIBLE DOWNHOLE CONTAINER FOR FEEDING SOLID INHIBITOR INTO THE WELL (OPTIONS) Russian patent published in 2021 - IPC E21B37/06 

FIELD: oil industry.

SUBSTANCE: invention relates to the field of oil production. A submersible downhole container for feeding a solid inhibitor into the well includes sections connected to each other by means of a coupling connection. Each section consists of a perforated housing and at least one container with an inhibitor placed inside it and at the same time not fixed, installed in the housing with the formation of a gap between its outer walls and the inner surface of the housing. The container is made with both blind ends and is perforated in the radial direction. The lower part of the section housing is equipped with a thrust element that prevents the container from falling out of the housing when the section is vertically positioned. The housing of the section in the upper part, above the perforations of the housing, is additionally equipped with a restrictive element fixed in the wall of the housing. The distance between the thrust and restrictive elements in the section body exceeds the length of the containers placed inside this section. The lower end of the lower section of the container is provided with a perforated plug. The perforation in the radial direction in the container is made in the upper and lower parts. The inner cavity of at least one container in the lower part is equipped with a separator piston made with the possibility of longitudinal movement. The separator piston according to the first variant is made in the form of a container made of a soft, liquid-permeable material, with loose, porous, chemically neutral granules placed inside the reservoir fluid and the inhibitor. The separator piston according to the second variant is made in the form of a hollow cylinder with a hole in the lower part, inside of which there are loose, porous, chemically neutral granules to the reservoir fluid and to the inhibitor. These granules have an average density of less than 1000 kg/m³. The solid inhibitor is placed in a container above the separator piston. The separator piston with granules occupies 5-20% of the volume of the container.

EFFECT: ensuring the possibility of supplying increased doses of the inhibitor to the well in the initial period of time and the subsequent gradual supply of the inhibitor to the well even under conditions of the presence of mechanical impurities in the borehole fluid.

10 cl, 1 dwg