RU2029053C1 - Well separator - Google Patents

Abstract

FIELD: well drilling. SUBSTANCE: well separator has body with outlet holes. Inner surface of body opposite to outlet holes is conical. Located body is flow deflector in form of stepped turbine with hollow shaft. Flow deflector forms with body and annular space communicated with external space through body outlet holes. Annular space is communicated with space above flow deflector. Hollow shaft of flow deflector is plugged in upper part and has outer longitudinal blades located below turbine blades. Hollow shaft has side holes opposite to body conical part. Side holes communicate annular space with shaft hollow. EFFECT: higher efficiency of separation of solid phase and filter from drilling mud in colmatation of permeable rocks. 1 dwg

Description

 The invention relates to the oil and gas industry, in particular to devices used in well drilling.

 A well-known drill, including a bit with hydraulic nozzles, a hollow centralizer with ribs, a housing with a tapered groove, a shaft and a jet pump, whose nozzles are directed upwards [1].

 The disadvantage of this device is the low separation factor, i.e. the occurrence of low centrifugal acceleration.

 The closest technical solution is a device for separating water from the air-water mixture, comprising a housing with outlet openings, a flow diverter placed in the housing and forming an annular cavity with it, communicating with external space through the housing outlet openings and its cavity above the flow diverter [2 ].

 The disadvantages of the device are low efficiency when using drilling fluid, clogging with a solid phase of the gap between the glass and the body.

 The purpose of the invention is to increase the efficiency of separation of the solid phase and fillers from the drilling fluid during the mudding of permeable rocks.

 To achieve the goal in a borehole separator comprising a housing with outlet openings, a flow diverter placed in the housing and forming an annular cavity with it, communicating with the external space through the housing outlet openings and its cavity above the flow diverter, the inner surface of the housing against its outlet openings is conical and the flow diverter is made in the form of a stepped turbine with a hollow shaft, muffled in the upper part and having external longitudinal blades below the turbine blades and side holes against the conical portion of the housing, reporting an annular cavity with the cavity of the shaft.

 The drawing shows a downhole separator.

 The separator includes a housing 1 with a hydraulic nozzle 2 located at the top of the conical groove of the housing. In the housing 1 there is a shaft 3. In the upper part of the shaft there is a high-speed multi-stage turbine, the rotors 5 of which are attached to the shaft, and the stators 4 are attached to the housing 1. To center the rotation of the shaft 3, radial bearings are installed at its ends 6. There are longitudinal ribs 7 on the shaft arranged so that they provide in the chamber a additional twisting of the mud flow exiting the last stage of the turbine until it enters the conical chamber b, where the final separation of the solid phase from the liquid occurs. To prevent clogging and the formation of a stagnant zone from the solid phase of the drilling fluid, the conical groove of the housing 1 below the nozzle is made cylindrical, forming a gap in with the rotating shaft 3 for passing a certain amount of drilling fluid to the bit. To supply the liquid phase of the drilling fluid to the bit inside the shaft 3, in its lower part there is an axial channel 8 connected to the chamber b by the side openings 9. The upper end of the shaft 3 has a thread on which the nut 10 is screwed to fix the parts on the shaft. At the ends of the body there are threads for connection with a bit and through a sub 11 - with a drill pipe string.

 Downhole separator operates as follows.

 The separator is installed in the layout of the drilling tool above the bit. When pumping the solution through the drill pipe, it enters the blades of the rotor 5 and stator 4 of the turbine, spinning around the shaft 3 at the outlet of the turbine, enters the chamber a. Here, the flow acquires additional acceleration due to the rotation of the shaft 3 with ribs 7. Then, the drilling fluid enters the hydrocyclone - chamber b, where additional separation of the solid phase of the drilling fluid takes place. The solid phase under the action of centrifugal force is discarded to the periphery and flows down the conical surface of the body and through the nozzle 2 is directed to the borehole wall. The liquid phase of the solution through the window 9 and channel 8 is directed to the bit.

 This three-stage rotation of the drilling fluid provides the maximum separation of solid and liquid phases.

Claims (1)

 Borehole separator, comprising a housing with outlet openings, a flow diverter placed in the housing and forming an annular cavity communicating with the external space through the housing outlet openings and its cavity above the flow diverter, characterized in that, in order to increase the efficiency of separation of the solid phase and filler from the drilling fluid during the mudding of permeable rocks, the inner surface of the body against its outlet holes is conical, and the flow diverter is made in the form of step turbines s with a hollow shaft, muffled in the upper part and having external longitudinal blades below the turbine blades and side holes against the conical part of the housing, communicating the annular cavity with the shaft cavity.

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