RU236089U1 - Well separator - Google Patents

Abstract

The utility model relates to oil field equipment used to protect a submersible pump from solid suspended particles carried out of the formation, and can be used for oil production during operation of wells with a high content of mechanical impurities in the produced fluid. A well separator comprises a cylindrical body and a shaft on which the main auger is located. An additional auger is mounted on the shaft parallel to the main auger, both augers are made with a helicoidal profile, cutouts in the form of triangle apexes are made on the blades of the main and additional augers on the shaft side. The blades of the main and additional augers are located at a distance of 15-50 mm from each other. The cutouts in the form of triangle apexes of the main and additional augers are located asymmetrically to each other. Provides high separation efficiency of formation fluid with an increased content of mechanical impurities. 2 clauses, 3 figs.

Description

The utility model relates to oil field 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.

A well separator is known (RU 157711, IPC E21B 43/38, published 10.12.2015), comprising a cylindrical body with inlet openings, connected to a sub for fastening to a pipe string, inside the body on the internal thread of the sub a branch pipe is fixed, 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 on a stud an additional separating unit is installed, also made in the form of an auger, the spiral channel of which connects the internal cavity of the separator with the pipe string.

The disadvantage of the known separator is the limited application, depending on the range of parameters of complicating factors (concentration of solid suspended particles, gas factor).

The closest is a gas separator (RU 2327866, IPC E21B 43/38, published 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 extracting 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, at least one spiral blade is made, the skeletal line of which is twisted relative 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.

The disadvantage of the known well separator is the limited use of it, due to the wear of the separator screw and the probability of the liquid flow being carried away to the intake of the deep pump when the recommended concentration of solid particles and the gas factor is exceeded, which results in a reduction in the operational life of the work. Another disadvantage of this device is its limited functionality, in particular, the low separation coefficient of fine particles contained in the extracted liquid.

The technical objective of the claimed utility model is to increase the efficiency of separation of formation fluid with an increased content of mechanical impurities.

The technical problem is solved by a well separator containing a cylindrical body and a shaft on which the main auger is located.

What is new is that an additional auger is installed on the shaft parallel to the main auger, both augers are made with a helicoidal profile, and on the blades of the main and additional augers on the shaft side there are cutouts in the form of triangle vertices.

What is also new is that the blades of the main and additional augers are located at a distance of 15-50 mm from each other.

What is also new is that the cutouts in the form of the triangle tops of the main and additional augers are located asymmetrically to each other.

Fig. 1 shows a general view of the device.

Fig. 2 shows a general view of the auger.

Fig. 3 shows a view of the auger from above.

The separator consists of a shaft 1 (Fig. 1), on which the main auger 2 is located, and parallel to the main auger 2, an additional auger 3 of a helicoidal profile is installed, enclosed in a housing 4. The blades of the main 2 and additional 3 augers are located at a distance of 15-50 mm from each other.

On the blades of the main and 2 additional 3 augers on the side of the shaft 1 (from the inside) there are cutouts 5 in the form of triangle vertices (hereinafter referred to as cutouts, Figs. 1-3), for example, by cutting or stamping or drilling. The size of the cutouts is made in such a way that they do not reach the middle of the auger blade. In this case, the cutouts 5 made on the main 2 (Fig. 1) auger do not coincide with the cutouts 5 made on the additional 3 auger, i.e. they are located asymmetrically to each other.

The device works as follows.

The shaft 1 of the separator is set in rotation. The gas-liquid mixture containing abrasive particles entering the separator is captured by the main 2 and additional 3 screws, and the liquid is separated. The process of centrifugal separation of heavy particles (mechanical impurities) begins with simultaneous extruded dispersion, including gas bubbles. Mechanical impurities, under the action of the main 2 and additional 3 screws, are thrown to the wall of the housing 4 and settle in the lower zone of the separator. Mechanical impurities that were not subjected to centrifugal action in the additional screw 3, through cutouts 5 enter the main screw 2, where they are subjected to repeated action of centrifugal force, thrown to the wall of the housing 4 and settle in the lower zone of the separator. After the liquid enters the lower zone of the separator, the mechanical impurities are in a suspended state and move in different directions at different speeds.

Due to the additional auger 3 (as well as their parallel arrangement with the main auger 2), the contact area of the formation fluid with the auger increases. The increased contact area reduces the time it takes for the formation fluid to transition from a turbulent to a calmer state, close to laminar. As a result, the fluid flow calms down faster and the degree of particle separation increases (increased separation). The time from the moment of the centrifugal force action and the separation of the first mechanical particle to the wall takes less time.

Asymmetrically located notches 5 of the main 2 and additional 3 augers facilitate extruded dispersion (crushing by squeezing/flowing through notches) of both formation fluid and gas bubbles. The use of separators in wells with a high gas factor usually facilitates the merging of gas bubbles due to the helicoidal shape of the auger. Notches 5 of the main 2 and additional 3 augers facilitate the crushing of gas bubbles, preventing their merging, which in turn minimizes the disruption of the downhole pump feed and the well output to the WRS.

Thus, the proposed well separator ensures high efficiency of separation of formation fluid with an increased content of mechanical impurities.

Claims (3)

1. A well separator comprising a cylindrical body and a shaft on which a main auger is located, characterized in that an additional auger is installed on the shaft parallel to the main auger, both augers are made with a helicoidal profile, and cutouts in the form of triangle vertices are made on the blades of the main and additional augers on the shaft side. 2. A well separator according to item 1, characterized in that the blades of the main and additional augers are located at a distance of 15-50 mm from each other. 3. A well separator according to item 1, characterized in that the cutouts in the form of the vertices of the triangles of the main and additional augers are located asymmetrically to each other.