RU2098617C1 - Device for well completion and treatment of bottom-hole formation zone (versions) - Google Patents

Abstract

FIELD: oil production. SUBSTANCE: device combines functions of jet pump and hydrodynamic pulsator. The device for well completion based on ejector of fluid from formation is provided with additional device which is hydrodynamically connected in special manner with jet apparatus and serves as pressure pulse generator. The device with packer is run into well on tubing string. When working fluid is injected into tubing string, the device functions as jet pump. When working fluid or some chemical agent is injected to annular space, the device operates as hydrodynamic pulsator and injects the fluid into formation. Two versions of device designs are offered. EFFECT: improved design. 4 cl, 4 dwg

Description

 The invention relates to the oil industry.

 A device for developing and processing a well is known, including a working pipe forming an annular space with a production string, a packer separating the annular space with the sub-packer zone, a jet pump, the suction chamber of which is in communication with the sub-packer zone, and the outlet communicates with the annular space, a check valve installed at the outlet of the diffuser of the jet pump, and a hydraulic line equipped with a check valve, communicating the under-packer zone with the working pipe, which is the prototype for the inventive device roystva (AS N 1339236, Cl. E 21 B 43/27).

 The disadvantage of this device is the low cleaning efficiency of the bottomhole zone due to the limited characteristics of the generated pressure waves and insufficient process control.

 The aim of the invention is to increase the efficiency of the process by treating the well with any chemical agent in the mode of hydro-pulse treatment of the bottom-hole formation zone.

 The essence of the invention lies in the fact that the device includes a working pipe forming an annulus with a production string, a packer separating the annulus with the sub-packer zone, a jet pump, the suction chamber of which is in communication with the sub-packer zone, and the outlet communicates with the annular space, a check valve installed at the outlet of the diffuser of the jet pump, and a hydraulic line equipped with a non-return valve, communicating the under-packer zone with the working pipe, is equipped with an additional chamber, communicated oh the annulus, arranged therein with the distribution body having a possibility alternately overlapping two output channels, and the two pulse tubes respectively communicated with output channels.

 There are two main options for the device. The first option provides that the chamber with the distribution organ is directly connected by the channel with the annulus, one of the impulse tubes is hydraulically connected to the sub-packer zone, and the other to the working pipe, and the exit from the jet pump diffuser and the exit from the impulse pipe connected to the working pipe, equipped with check valves. This option also provides a sub-option in which the device has an additional channel with a check valve that hydraulically connects the under-packer zone with the working pipe.

 In the second variant, both impulse tubes are in communication with the sub-packer zone, the chamber with the distribution organ is in communication with the annulus through the diffuser of the jet pump, the suction channel of which, in turn, is in communication with the sub-packer zone through the chamber of the distribution organ and the pulse tubes, there is also an additional channel with a non-return valve, hydraulically connecting the under-packer zone to the working pipe, and a non-return valve in the pressure channel in front of the jet pump nozzle. This option also has a sub-variant in which the device is provided with a channel with a check valve hydraulically communicating the sub-packer zone with the suction channel of the jet pump.

 Schemes of this device in the first embodiment are shown in FIG. 1 and FIG. 2, and in the second embodiment in FIG. 3 and FIG. 4.

 According to the first embodiment (Fig. 1), the device consists of a working pipe 1, a jet pump 2, including a nozzle 3 connected to the working pipe by a channel 4, a receiving chamber 5 connected to a sub-packer zone 6 by a channel 7, a displacement chamber 8, a diffuser 9, a packer 10, separating the annular space 11 with a sub-packer zone, a chamber 12, hydraulically connected to the annular space by a channel 13 and a distribution body 14 arranged with it, having the ability to alternately block the output channels 15, 16, the impulse tubes 17, 18, the check valve 19, installed claimed outlet diffuser of the jet pump and the check valve 20 installed at the outlet of the capillary.

 The device operates as follows. If the working fluid is supplied to the working pipe 1, then, passing through the channel 4, it enters the jet pump 2. In this case, the check valve 20 blocks the passage of fluid through the pipe 17 and the annulus 11. In this case, the device operates as a jet pump, with the output of the working and liquid sucked from the under-packer zone into the annulus.

 If the working fluid is supplied into the annulus 11 (the working pipe is closed), then passing through the channel 13, it enters the chamber 12, in which the distribution body 14 is placed. In this case, the distribution body is made in the form of a working chamber 21 having throttle openings 22 and inside which is the baffle plate 23. The distribution body closes one of the output channels (in this case 16). In this case, the liquid, passing through the throttle openings, enters another channel 15, the impulse tube 17 and then into the working pipe 1. When creating a certain flow rate of the working fluid in the working chamber 21, an imbalance of forces acting on the jack washer on one side and the other, due to the pressure drop during the passage of fluid through the throttle holes. In this case, the washer is transferred to another channel 15, blocking it and simultaneously opening the previously blocked channel 16. In this case, the fluid flow is directed through the output channel 16 to the impulse tube 18 and then to the sub-packer zone 6. In the subsequent process, the washer transfer is repeated.

 Since the distribution body is triggered almost instantly, pressure pulses occur in the impulse tubes, the magnitude of which will depend on the pressure in the working fluid.

 After the distribution organ system of the impulse tubes begins its operation, the frequency of operation of the baffle plate will depend on the length of the impulse tubes in which the wave processes occur. In other words, some time after the start of the device, the latter starts to work in self-oscillating mode.

 If the well has insufficient injectivity to start and continue the operation of the device in a pulsed mode, then the flow of working fluid into the device with the necessary flow rate can be controlled by opening the working pipe 1. In this case, part of the fluid flows from the sub-packer zone to the working pipe through channel 7, nozzle 3 and channel 4.

 When the device is operating in pulsator mode with the flow of part of the liquid from the sub-packer zone to the working pipe, the hydrodynamic losses associated with the small cross section of the nozzle 3 can be so significant that they will interfere with the normal operation of the device. In this case, the device has an additional channel 24 (figure 2) with a check valve 25, which eliminates the hydrodynamic losses associated with the passage of fluid through the nozzle of the jet pump.

 According to the second variant (Fig. 3), the device consists of a working pipe 1, a jet pump 2, including a nozzle 3 connected to a working pipe by a channel 4, equipped with a check valve 19, a receiving chamber 5 connected to a sub-packer zone 6 by a channel 7, a displacement chamber 8 , a diffuser 9, a packer 10, separating the annular space 11 with the under-packer zone, a channel 13 connecting the working pipe to the under-packer zone and equipped with a check valve 20, of the chamber 12, with a distribution body 14 located therein, having the possibility of alternately blocking the output channels the catches 15, 16 and the impulse tubes 17, 18.

 The device operates as follows. If the working fluid is supplied to the working pipe 1, then, passing through the channel 4, it enters the jet pump 2. In this case, the check valve 20 closes the fluid passage through the channel 13 into the under-packer zone 6. In this case, the device operates as a jet pump, with the outlet being sucked from the sub-packer zone of the liquid, through impulse tubes 17 or 18, a distribution body 14, channel 17, a diffuser 9 into the annulus 11.

 If the working fluid is supplied to the annulus 11 (the working pipe is closed), then passing through the diffuser 9 (in the opposite direction), the receiving chamber 5, the channel 7 enters the chamber 12, in which the distribution body 14 is placed. In this case, the distribution body is made in in the form of a working chamber 21 having throttle openings 22, inside of which a baffle plate 23 is placed. The distribution body blocks one of the output channels (in this case 15). In this case, the liquid, passing through the throttle openings, enters another channel 16, the impulse tube 18 and then into the under-packer zone 6. Further, the device operates as described previously in the first embodiment of the device.

 If the well has insufficient injectivity to start and continue the operation of the device in a pulsed mode, then the flow of working fluid into the device with the necessary flow rate can be controlled by opening the working pipe 1. In this case, part of the fluid flows from the sub-packer zone to the working pipe through channel 13.

 In addition, the device according to this embodiment can be equipped with an additional channel 24 (Fig. 4), which communicates the chamber 12 with a sub-packer zone 6 and is equipped with a check valve 25. Moreover, if the device operates in the jet pump mode, the liquid sucked from the sub-packer zone enters channel 7, bypassing the distribution body 14. This makes it possible to reduce hydraulic losses and thereby increase the efficiency of the pump.

 Thus, the device (in all the presented variants) can work as a hydrodynamic pulsator with the injection of any chemical reagent into the formation and, if necessary, as a jet pump, for example, for removal of reaction products from the bottom-hole zone of the formation and subsequent development of the well.

Claims (4)

 1. Device for well development and impact on the bottom-hole formation zone, including a working pipe forming an annulus with a production string, a packer separating the annulus with a sub-packer zone, a jet pump, the suction chamber of which is in communication with the sub-packer zone, and the outlet is in communication with the annular space , a check valve installed at the outlet of the diffuser of the jet pump, and a hydraulic line equipped with a check valve, connecting the under-packer zone with the working pipe, characterized in that o it is equipped with an additional chamber communicated with the annular space, having two output channels, and disposed therein with the possibility of alternately overlapping said output channels by a distribution body, wherein the hydraulic line communicating the sub-packer zone with the working pipe is made in the form of an additional chamber communicated with the output channels two impulse tubes, one of which is connected to the sub-packer zone, the other to the working tube, and the check valve in the mentioned hydraulic line is installed at the impu snoy tube associated with the working pipe.  2. The device according to claim 1, characterized in that it has an additional channel with a check valve, hydraulically communicating the under-packer zone with the working pipe.  3. A device for well development and impact on the bottom-hole formation zone, including a working pipe forming an annulus with a production string, a packer separating the annulus with a sub-packer zone, a jet pump, the suction chamber of which is in communication with the sub-packer zone, and the outlet is in communication with the annular space a hydraulic line with a check valve connecting the under-packer zone to the working pipe, and a check valve installed in the pressure channel of the jet pump, characterized in that it is provided with communicating with the annulus through the diffuser of the jet pump, an additional chamber having two output channels, placed in it with the possibility of alternately blocking its output channels with a distribution body, and two impulse tubes in communication with the output channels of the additional chamber and hydraulically connected to the under-packer zone, and a check valve installed in the pressure channel of the jet pump is located in front of its nozzle.  4. The device according to p. 3, characterized in that it has an additional channel with a check valve, hydraulically communicating the under-packer zone with the suction channel of the jet pump.

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