SU1689594A1 - Device for completing and operating well - Google Patents

Description

The invention relates to the mining industry. The purpose of the invention is to increase the efficiency of the device by providing the possibility of extending the period of natural flow of the well. For this purpose, the sleeve 10 is ring-shaped, spring-loaded from the side of the jet pump 4 and has an annular groove in the upper part on the outer surface, and radial channels in the lower part for communicating the in-line and annular spaces in the lowest position of the sleeve 10. The pump 4 is made in the upper

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parts with nozzle 6 ring type and nut. The latter is installed with the ability to interact with the nozzle 6. During the operation of the well, all gas-liquid mixture coming from the reservoir is sent to the bottom of the well and enters the injection chamber of the pump 4 through the shank. Similarly, the device works in case of well completion and periodic pumping of the working agent into the annulus. By choosing the pressure and flow rate of the working agent and the pump’s constructive dimensions, it is possible to provide a predetermined amount of pressure reduction at the bottom of the well up to atmospheric pressure. The processing of the bottomhole formation zone is greatly simplified in the embodiment of the device. 2 Il.

The invention relates to the field of the mining industry, in particular, to devices for intensifying the operation of production wells in the presence of fluid in their products.

The aim of the invention is to improve the efficiency of the device by providing the possibility of extending the period of natural flow of the well.

FIG. 1 shows the proposed device; in fig. 2 - the same, removable option.

The device for the development and operation of the well (Fig. 1) is installed on tubing tubes 1 and includes a housing 2 with radial channels 3, a jet pump 4 with a central injection chamber 5, a ring-type nozzle 6 located between the walls of the injection chamber and a restrictor diffuser 7, and radial channels 8, connecting the nozzle 6 with the annular space 9 between the device body 2 and the jet pump 4, the differential sleeve 10, spring-loaded spring 11 from the bottom side, and the packer 12 sealing the annular space The space 13 between the tubing string 1 and the production string 14. The differential bushing 10 is located concentrically with the jet pump 4 and is provided with an annular groove in the upper part of the outer surface. In the lower part of the annular groove there are radial channels 15, communicating through radial channels 3 in housing 2 and radial channels 8 in the jet pump 4 at the lowest position of the sleeve, the annular space 13 with the in-line space 16. The lateral surfaces of the differential sleeve 10 are provided with sealing elements 17, warning gas and liquid flows between the annular and intratubular spaces. The lower part of the jet pump 4 is equipped with a shank 18. The jet pump 4 is mounted in the housing 2 of the device using a threaded connection. The position of the restriction device - the diffuser 7 in the jet pump 4 is fixed by a nut 19, and the position of the spring 11 in the housing 2 - the sub-stop 20.

In the removable version of the device (Fig. 2), the lifting pipe string is additionally equipped with landing nipples 21, and the device body 2 is equipped with a sub (lock ”valve-cutter) 22 with sealing sleeves 23. A circulating valve assembly including valve body 24 is mounted between the landing nipples 21 and sleeve 25 with by-pass holes. The sleeve is sealed in the housing with seals and fixed in it in the "Open" position, communicating the annulus 13 with the radial passages 3 of the housing 2 of the device.

The device works as follows.

The principle of operation of the device is considered on the example of a gas well containing the liquid in the extracted products.

In the process of natural well flowing, the differential bushing 10 is under the action of the spring 11 in its extreme upper position and overlaps the communication of the annulus 13 with the in-line space 16. The gas-liquid mixture coming from the reservoir segregates in the wellbore, splitting into two parts. Liquid with dissolved gas is directed down to the bottom of the well, and gas with suspended particles of liquid rises up through the annular space 9 between the device body 2 and the jet pump 4 and then through the radial channels 8 and the body 2 and the annular nozzle 6 enters the inner pipe space 16 (column lift pipes). With the passage of the gas stream through the nozzle 6 increases the speed and, accordingly, decreases the gas pressure. Under the action of the created pressure drop between the bottomhole pressure and the pressure in the inlet section

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the mixing chamber of the jet pump accumulated at the bottom of the well liquid enters through the shank 18 into the chamber 5 of the injection and is injected into the gas flow, passing into a finely dispersed state. As a result of creating a homogeneous gas-liquid flow in the lift pipes, pressure losses in the wellbore are significantly reduced, which allows to increase the gas flow rate and extend the natural flow of the well by using its own energy of the reservoir gas.

From the moment the well spontaneously stops flowing (or reducing the gas flow rate to a value that ensures steady flow of fluid), the well is mechanized operated by feeding a working agent (water or compressed gas) from the surface into the annulus 13. Under the action of the pressure difference of the gas-liquid mixture in the annular space 9 between the device body 2 and the jet pump 4, the differential sleeve 10, compressing the spring 11, moves to the lowest position and communicates through the radial channels 3, 15 and 8 the annular space 13 with the jet nozzle 6 pump 4. At the same time, the communication of the annular space 9 with the inner-tubular space 16 is blocked. During the operation of the well, the entire gas-liquid mixture coming from the formation is directed to the bottom of the well and through the tail Vic 18 enters the chamber 5 of the injection pump jet pump 4. Similarly, the device works in the case of well completion and periodic pumping of the working agent into the annulus. The choice of pressure and flow of the working agent and the structural dimensions of the jet pump

It is possible to provide a predetermined amount of pressure reduction at the bottom of a well, up to atmospheric pressure.

The proposed device also allows for the processing of the bottomhole formation zone by pumping the working solution into the lift tubes. Working solution, passing through the chamber 5 of the injection and the nozzle 6, enters the bottom of the well and then into the treated reservoir. The processing of the bottomhole formation zone is greatly simplified in the removable version of the device (Fig. 2), which is installed in the lift pipes and is lifted to the surface by the method of cable works.

Claims (1)

Claim A device for the development and operation of a well, comprising a housing with radial channels connected to a column of lifting pipes, a packer installed underneath, a housing 8 arranged for axial movement of a differential sleeve with radial channels and a jet pump, characterized in that in order to improve the efficiency of the device by providing the possibility of extending the period of natural flow of the well, the differential sleeve is made ring-shaped, spring loaded from the side of the jet pump and has in the upper part of the outer surface of the annular groove, and in the lower part of the radial channels for the message in-tube and annular spaces in the lowermost position of the sleeve, while the jet pump is made in the upper part with a nozzle of the ring type and a nut, which is installed with the possibility of interaction with the latter . 1689594 FIG. 0