RU2161699C2 - Device for well completion and intensification of inflow of formation fluid - Google Patents

Abstract

FIELD: oil-producing industry. SUBSTANCE: device has hollow body whose longitudinal channel accommodates rigidly built-in jet pump. Body has radial channels: one channel in external wall of body lower part is for connection of subpacker part of wellbore with pipe string, while the other on internal wall of body part is for connection of subpacker part of wellbore with pipe string. Installed in zone of radial channels are correspondingly external and internal fine strainers. Made above internal strainer is seat for sealing member of logging cable. Device may additionally contain jet pumps with regulated nozzle. Installed in each radial channel in internal wall is check valve. EFFECT: higher efficiency of device operation and extended its functional potentialities. 2 cl, 4 dwg

Description

 The invention relates to the field of oil industry and can be used for well development and stimulation of oil and gas inflows.

 A device for opening, developing and researching a formation (a.s. USSR N 1680969, Mcl. E 21 B 49/00, 43/00) is known, including a housing connected to a tubing string, a jet pump mounted on it, movably placed in the housing, a spring-loaded sleeve with an injection hole, a packer and a depth tool with a flexible cable, in addition, it is equipped with a nozzle, a perforator and a locking element that is connected by a flexible cable to the depth device, and the nozzle is installed under the body and rigidly connected to it, and the perforator is installed under patr bkom and has at the bottom an axial hole and a mounting seat for placing thereon the locking element, the packer is mounted on the nozzle, which is configured with an annular channel and a check valve for communicating the cavities above and below the packer.

 This type of jet pump does not allow creating high depressions on the reservoir, it is impossible to control the development process, in addition, in the process of working with this device, it is impossible to carry out an extended recording of reservoir characteristics (only pressure can be recorded).

 A device for inducing the influx of formation fluid (RU N 2015317, Mcl. E 21 B 49/00), comprising a hollow body with radial channels formed therein, connected to a pipe string, an insertion jet pump installed in the body cavity with a recording instrument unit, the check valve and packer, in addition, it is equipped with a latch, including stops and thrusts, placed on the block of recording devices, the check valve is made in the form of a spring-loaded piston and is placed in the cavity of the housing under the jet pump, the input channel of the latter it is aligned with the radial channels of the hollow body.

 This type of jet pump does not allow monitoring the development process, in addition, in the process of working with this device it is impossible to carry out an extended recording of reservoir characteristics (you can record only pressure), after completion of development work or to carry out work on the chemical effect on the formation, the pump must be raised , for this, wire rods are installed on the logging cable to unfasten the pump stops, these stops can jam, then the lifting must be done with damage to the logging cable (which will change, and it is expensive), after the development and stimulation each time it is necessary to carry out further geophysical control, the pump is difficult to manufacture.

 The technical solution of the invention is to expand the functionality and increase the efficiency of the device.

 A device for mastering, stimulating the flow of formation fluid, comprises a housing with radial channels, with a central passage and a longitudinal channel eccentrically made in the housing, a jet pump, a check valve, according to the invention, the jet pump is built-in and is rigidly mounted in the longitudinal channel of the housing, with one radial channel made in the outer wall of the body, connects the above-packer part of the wellbore with a pipe string, another radial (suction) channel connects the under-packer part of the wellbore with of the pipe and made on the inner wall of the middle part of the body, in the area of the radial openings, respectively, external and internal fine filters are installed; moreover, a seat seat is installed over the internal filter to install a fixed cable sealing element for the geophysical instrument, in addition, the non-return valve is installed in the radial ( suction) channel, made on the inner wall of the housing.

 In addition, the device further comprises built-in jet pumps with an adjustable nozzle, rigidly mounted in the longitudinal channels of the housing, and radial channels made in the outer wall of the lower part of the housing, connecting the over-packer part of the wellbore with the pipe string, and in the inner wall of the middle part of the housing suction channels connecting the under-packer part of the wellbore with the pipe string, respectively, in each radial channel (suction) made in the inner wall of the housing and at the outlet of each jet Asosa, a check valve.

 In FIG. 1 shows a device for the development, intensification of formation fluid inflow, including one jet pump, general view; in FIG. 2 is a section A-A of FIG. 1; in FIG. 3 shows a device for developing, intensifying the influx of formation fluid, including several jet pumps, general view; in FIG. 4 is a section through GD of FIG. 3.

 The device (Fig. 1) is installed on tubing (tubing) 1 and contains a housing 2, a jet pump 3 and a check valve 9, in the passage through the central channel there is a landing seat 10, which rests on the sealing element 11 of the geophysical cable 12.

 The housing has a hollow and detachable design, in the body of which are channels B, C.

 The jet pump 3 includes a fine filter 4 at the entrance to the adjustable nozzle 5, a mixing chamber 6, a diffuser 7, a check valve 9, a filter 8 at the entrance to the mixing chamber of the pump.

 In the longitudinal channel B (Fig. 2) of the casing, a jet pump 3 is built-in, the casing is mounted with studs 13 in the longitudinal channels B.

 The device (Fig. 3) is installed on tubing (tubing) 1 and contains a housing 2, a jet pump 3 and a check valve 9, in the passage of the Central channel is a landing seat 10, which abuts the sealing element 11 of the geophysical cable 12.

 The housing has a hollow and detachable design, in the body of which are channels B, C.

 The jet pump 3 includes a fine filter 4 at the entrance to the adjustable nozzle 5, a mixing chamber 6, a diffuser 7, a check valve 9, a filter 8 at the entrance to the mixing chamber of the pump.

 In the longitudinal channel B (Fig. 2) of the housing, jet pumps 3 are integrated, the housing is mounted with studs 13 in the longitudinal channels B.

 The operation of the device for the development, intensification of formation fluid inflow.

 The device (Fig. 1) descends into the production casing 16 on the tubing 1 together with the packer 14 and is installed at the calculated depth.

 A working fluid is fed through the production string through a fine filter 4, flowing out of the adjustable nozzle 5, it gains high speed and creates a vacuum in the mixing chamber 6, which is connected to the sub-packer zone through a check valve 9 and a filter, in the mixing chamber it mixes with the reservoir fluid and through the diffuser 7 through the tubing 1 enters the surface. The sealing element 11, located in the seat saddle 10, provides separation of the internal cavities of the jet pump, located above and below it.

 The device (Fig. 3) descends into the production casing 16 on the tubing 1 together with the packer 14 and is installed at the calculated depth.

 The working fluid is supplied through the fine filter 4, flowing out of the adjustable nozzles 5, it gains high speed and creates a vacuum in the mixing chambers 6, which are connected to the sub-packer zone through check valves 9 and a filter, in the mixing chambers it is mixed with formation fluid and through diffusers 7 through the tubing 1 enters the surface. The sealing element 11, located in the seat saddle 10, provides separation of the internal cavities of the jet pumps located above and below it.

 In the process of development, intensification of the inflow, full geophysical studies are carried out (pressure, temperature, inflow, composition, flow rate, etc.). When the flow of the working fluid is stopped, the valve 9, under the action of the return spring, returns to its original position, sealing the under-packer zone. Pressure recovery is recorded by a geophysical instrument.

 If you need to master at high pressures, you just need to change the direction of injection of the working fluid, inject through the tubing.

 For the intensification of oil and gas inflows, it is necessary to treat the bottom-hole zone of the formation with chemical reagents, for this they raise a geophysical instrument and pump chemical reagents into the formation.

Using the proposed invention in comparison with the prototype allows you to:
to reduce the time of development and stimulation of the inflow by eliminating the tripping of the pump after development and when treating the bottom-hole formation zone with chemical reagents;
carry out continuous monitoring of the development process in the sub-packer zone;
conduct a full range of geophysical research in the development process.

 The device for developing and stimulating the influx of formation fluid was tested in production well N 1296 bush 13 of the Konitlorskoye field during the development of the productive formation AC11, which lies in the interval 2986-2988 m. During the development of the well, the total operating cycle time, including launching, development, hydrodynamic studies, the rise was 4 5 days.

 At the well during development using a jet device similar to the prototype, followed by geophysical monitoring before the well was put into operation, it was 8 days.

 A positive effect from the use of the inventive device is achieved by reducing the time for well development and improving the quality of the study of the productive formation in the process of its development and intensification.

Claims (2)

 1. A device for the development and intensification of the influx of formation fluid, comprising a housing with radial channels, with a through-passage central and longitudinal channel made in the housing, a jet pump, a check valve, characterized in that the jet pump is built-in and rigidly installed in the longitudinal channel of the housing, radial channels are made: one - in the outer wall of the lower part of the body connecting the nadpakerny part of the wellbore with a string of pipes, the other - on the inner wall of the middle part of the body connecting the subpakerny part of the wellbore with a pipe string, in the area of the radial openings, respectively, external and internal fine filters are installed, and a landing seat is made above the internal filter to install a cable sealing element for a geophysical instrument, in addition, a non-return valve is installed in a radial hole made on the inner wall corps.  2. The device according to p. 1, characterized in that it further comprises built-in jet pumps with an adjustable nozzle, rigidly installed in the longitudinal channels of the body, and radial channels made in the outer wall of the lower part of the body, connecting the over-packer part of the wellbore with the pipe string and the inner wall of the middle part of the body - connecting the under-packer part of the wellbore with a pipe string, respectively, in each radial hole made in the inner wall of the body, a check valve is installed.

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