Combined action downhole separator

Abstract

This utility model relates to oilfield equipment used to protect a submersible pump from suspended solids carried out of the formation. It can be used for oil production in wells with high solids content in the produced fluid. The technical result is increased separation efficiency for formation fluids containing solids through the use of a combined auger, which expands the separator's functionality. The combined-action downhole separator comprises a housing and a shaft with a helical auger mounted thereon.The shaft has a helical profile screw at the bottom, a branching module in the central part of the shaft, made in the form of a truncated cone, on which semicircular recesses are evenly distributed over the entire surface, located diagonally to the main axis of the separator, and piezoceramic modules of cylindrical shape are located above the branching module in the upper part of the shaft. 2 fig.

Description

[0001] The utility model relates to oilfield equipment used to protect a submersible pump from solid suspended particles carried out of the formation, and can be used for oil production during the operation of wells with a high content of mechanical impurities in the produced fluid.

[0002] A well separator is known (RU patent No. 157711, IPC E21B 43 / 38, published on 10.12.2015, bulletin No. 34), comprising a cylindrical body with inlet openings, connected to a sub for fastening to a pipe string, a branch pipe is fixed inside the body on the internal thread of the sub, on the outer surface of which a separating unit in the form of an auger is installed, the spiral channel of which communicates the inlet openings of the body with the internal cavity of the separator, under which a container for mechanical impurities is installed, inside the branch pipe an additional separating unit is installed on a stud, also made in the form of an auger, the spiral channel of which connects the internal cavity of the separator with the pipe string, wherein the augers of the spiral channel of the additional separating unit and the spiral channel of the separating unit on the outer surface of the branch pipe are made with different directions of winding, and the auger of the spiral channel of the additional separating unit is made with a large angle of ascent,than the auger of the spiral channel, located on the outer surface of the branch pipe, at the same time the stud is made with a thread, and the auger of the spiral channel of the additional separating unit is made in the form of a spring with a rectangular cross-section of the coil, and on one side the auger is attached to the stud, and on the other it rests against a nut installed on the stud, also the stud is fixed in the centralizer, the outer conical surface of which enters the cone made in the adapter, while on top of the stud there is a cone for connection with the towing device, also the outer diameter of the centralizer is less than the inner diameter of the pipe column.

[0003] The disadvantage of this well separator is the low degree of purification of the extracted product and dispersion of gas bubbles.

[0004] The closest is a well separator (RU 2327866, IPC E21B 43 / 38, published on 27.06.2008), comprising a cylindrical body with a protective sleeve and a shaft on which a screw auger, a paddle wheel and a separating drum with radial blades are arranged sequentially in the direction of flow, for the extraction of oil with a high content of solid abrasive particles on the inner surface of the protective sleeve, at least around the auger or around the auger and the paddle wheel there is at least one spiral blade, the skeletal line of which is twisted with respect to the auger blades in the same or opposite direction, and / or at least two longitudinal blades are installed, parallel to the shaft axis with the possibility of creating a vortex path by the liquid flow along the walls of the protective sleeve, preventing contact of solid abrasive particles with the surface of the sleeve.

[0005] A disadvantage of the well-known downhole separator is its limited application, depending on the range of complicating factors (concentration of suspended solids, gas factor). Exceeding the recommended solids concentration increases wear on the separator auger and the risk of fluid flowing into the downhole pump intake, reducing its service life. Another disadvantage of this separator is the merging of gas bubbles, which increases the risk of pumping unit failure due to gas contamination.

[0006] The technical challenge is to increase the separation efficiency of formation fluid containing mechanical impurities through the use of a combined screw, which allows for expanding the functionality of the separator.

[0007] The technical problem is solved by a combined-action well separator, which includes a housing and a shaft with an auger placed on it.

[0008] What is new is that the shaft has a helical profile auger at the bottom, in the central part of the shaft there is a branching module made in the form of a truncated cone, on which semicircular recesses are evenly distributed over the entire surface, located diagonally to the main axis of the separator, and above the branching module in the upper part of the shaft there are piezoceramic modules of a cylindrical shape.

[0009] Fig. 1 shows a general view of the device,

[0010] Fig. 2 shows the shape of the notch on the branching module,

[0011] where 1 is the body,

[0012] 2 - shaft,

[0013] 3 - helical profile auger,

[0014] 4 - branching module,

[0015] 5 - piezoceramic modules,

[0016] 6 - semicircular recesses.

[0017] The downhole separator (hereinafter referred to as the separator) consists of a housing 1 (Fig. 1) and a shaft 2 with a helical auger 3 placed on it in the lower part. In the central part of the shaft 2, a branching module 4 (Fig. 2) is placed, made in the form of a truncated cone, expanding towards the upper part, on which semicircular recesses 6 are uniformly located over the entire surface of the truncated cone, located diagonally to the main axis of the separator. The upper end of the branching module 4 (Fig. 1) is made in the form of a disk. Above the branching module 4, in the upper part, piezoceramic modules 5 (for example, PSKP-44, PSKP-52) of any known shape, for example, cylindrical, are located on the shaft 2.

[0018] The formation fluid entering the separator, a gas-liquid mixture containing mechanical impurities (sand, corrosion products, wellbore deposits, insoluble sediments, etc.), is captured by the helical auger 3 at the bottom. As the formation fluid moves along the auger 3, coarse mechanical impurities are thrown toward the wall of the housing 1 and settle in the lower zone of the separator. After the formation fluid reaches the branching module 4, equipped with recesses 6 (the recesses divide the flow into separate parts, facilitating better separation of mechanical impurities from the divided flow, as well as their subsequent sedimentation), medium-dispersed mechanical impurities are abruptly thrown toward the wall of the housing 1 and settle in the lower zone of the separator. At the same time, fine particles are exposed to ultrasonic waves in the frequency range of 18-24 kHz.The ultrasonic waves cause acoustic coagulation, which results in the aggregation of fine particles. As a result, the fine particles also settle in the lower zone of the separator.

[0019] Thus, due to the operation of the combined auger, the process of separation of formation fluid containing mechanical impurities consists of three successive stages: coarse mechanical impurities are separated by a helical profile auger, medium-dispersed mechanical impurities are separated by a sharp change in flow movement on the branching module, and fine mechanical impurities are enlarged and separated under the action of ultrasound using piezoceramic modules.

[0020] The advantage of a combined-action downhole separator is that it effectively separates mechanical impurities from the formation fluid through the simultaneous use of mechanical and ultrasonic action, allowing the fluid to reach the desired concentration at the separator outlet. The piezoceramic modules incorporated into the device enhance the separation and settling effect.

Claims

A combined-action downhole separator comprising a housing and a shaft with an auger placed thereon, characterized in that the shaft has a helicoidal profile auger placed in the lower part, in the central part of the shaft there is a branching module made in the form of a truncated cone, on which semicircular recesses are evenly distributed over the entire surface, located diagonally to the main axis of the separator, and above the branching module in the upper part of the shaft there are piezoceramic modules of cylindrical shape.

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