RU2781716C1 - Stream switch - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and can be used to remove gas from the annulus when extracting the fluid. The flow switch is placed as part of the packer device with the formation of an annular space for communication-separation of the above-packer and under-packer annular spaces bypassing the main sealing element. It contains a cylindrical body, upper and lower switching mechanisms and is installed with the possibility of moving along the packer device shaft due to the interaction of the activating mechanism with the switching mechanisms. Switching mechanisms contain external and internal collets. The inner collet is located coaxially in the outer collet with the possibility of axial movement upon contact with the activating mechanism and return when its impact is terminated.

EFFECT: invention provides expansion of the technical capabilities of the packer device with the possibility of closing the radial bypass channels and switching the direction of flows inside the packer device without removing it from the well; increasing the efficiency of gas removal at any GOR from the under-packer annulus to the above-packer annulus bypassing the sealing element.

6 cl, 7 dwg

Description

The invention relates to the oil industry and can be used to remove gas from the under-packer annulus when extracting the fluid.

Known downhole packer installation and a gas vent for it, including a packer, a device for venting gas installed in the cavity of the packer coaxially with it. The gas removal device is made of two parts, lower and upper, the upper part is made with an outer diameter equal to the inner diameter of the packer barrel, the lower part is made with an outer diameter less than the inner diameter of the packer barrel and is installed to form a longitudinal bypass between its outer surface and the inner surface of the packer barrel channel, the lower end of the lower part of the gas evacuation device is provided with a shoulder, the diameter of the outer surface of which is equal to the diameter of the inner surface of the packer barrel, the shoulder is located below the radial bypass channel of the packer, the lower part of the gas outlet device is separated from its upper part by the upper radial bypass channel, which connects its longitudinal the bypass channel with the upper part of the packer cavity, the lower end of the upper part of the gas outlet device and the upper end of its lower part in the area of the upper radial bypass channel are made to form a zone of narrowing of the cavity of the gas outlet device. (Patent RU No. 2459930 C1 for the invention "DOWNHOLE PACKER INSTALLATION AND GAS REMOVAL DEVICE FOR IT". - IPC: E21B 43/00 - 27.08.2012).

A disadvantage of the well-known downhole packer installation and gas removal device for it is the inability to block the radial bypass channels and switch flows inside the packer.

Known installation for periodic separate oil production from two layers, including an electric centrifugal pump, packers for installation in the wellbore and separating the upper oil layer from the bottom, characterized in that it contains a stepped pipe, consisting of connected cylinders of different diameters, installed between the packers and equipped with the place of their connection with openings for the entry of oil from the upper reservoir, an intermediate pipe, the lower end of which is equipped with a plunger entering the cylinder of a smaller diameter of the stepped branch pipe, and the upper end is fixed to the pump housing and equipped with a flow switch consisting of a spring-loaded piston with an annular groove, two outlet channels of oil, respectively, from the upper and lower formations into the well, and the over-piston cavity communicated with the compressed gas supply pipe from the wellhead, moreover, an additional plunger of a stepped shape enters into the cylinder of a larger diameter of the stepped branch pipe, made with holes for the channels to switch of the flow, and the upper end of the additional plunger is fixed to the pump housing (Patent RU No. 2443852 C2 for the invention "PLANT FOR PERIODICAL SEPARATE OIL PRODUCTION FROM TWO LAYERS". - IPC: E21B 43/14 - 27.02.2012).

The disadvantage of the known installation is the lack of the possibility of switching flows without pressurizing the tube.

The objective of the invention is to ensure stable operation of the pump in production mode.

The technical result that can be obtained by implementing the proposed invention is as follows:

- in expanding the technical capabilities of the packer device;

- the possibility of overlapping bypass channels in the packer device;

- in increasing the efficiency of gas removal at any GOR from the under-packer annulus to the above-packer annulus;

- in providing the possibility of switching the direction of flows inside the packer device without removing it from the well using an activating mechanism.

The technical result is achieved by the fact that the flow switch, placed as part of the packer device with the formation of an annular space for communication-separation of the above-packer and under-packer annular spaces bypassing the main sealing element, includes a hollow cylindrical body, upper and lower switching mechanisms and is installed with the possibility of movement along the wellbore of the packer device due to the interaction of the activating mechanism with the switching mechanisms, while the switching mechanisms contain an outer and an inner collet, the inner collet being located coaxially in the outer collet with the possibility of axial movement upon contact with the activating mechanism and return when its action is terminated. The flow switch has an inner surface that encloses the actuating mechanism with an optimal clearance. The outer collet in the switching mechanism is made with the possibility of fixing the flow switch in the extreme positions. The petals of the outer collet have the possibility of releasing the activating mechanism when they exit into at least one corresponding annular groove or chamfer on the inner cylindrical surface of the packer barrel. The inner collet is loaded with an elastic element. The shape of the petals of the collets has at least one protrusion on the inner surface.

Based on the foregoing and conducted patent research, we can conclude that we have not identified technical solutions that are based on features that coincide with all the distinguishing features of the proposed technical solution.

It follows from this that the technical solution does not explicitly follow from the prior art, from which it can be concluded that the device meets the criterion of "inventive step".

The technical essence, design and principle of operation of the flow switch are illustrated by the following drawings:

Fig. 1, 2, 3, 4, 5 - interaction of the switching mechanism in the flow switch with the activating mechanism in the packer.

Fig. 6 – position of the switching mechanism in the injection mode (the above-packer annular space is hermetically sealed and separated from the under-packer space).

Fig. 7 – position of the mechanism for switching to the production mode and gas removal through the annulus (the above-packer annulus is in communication with the under-packer space).

The arrows show the direction of flows during injection 11 (Fig. 6) and during production 9 (Fig. 7).

The claimed device consists of a hollow cylindrical body 8, upper 12 and lower 13 switching mechanisms, consisting of an outer collet 2 and a spring-loaded inner collet 3 installed in it.

The thread switcher works like this:

In the pumping mode, the flow switch is in the upper position, while the above-packer annular space above the packer device is separated from the under-packer annulus (Fig. 6). Petals of the upper outer collet 2 are located in the annular groove 6 of the barrel of the packer device 1 (Fig. 5). At the same time, the inner collet 3 is in a spring-loaded position.

After the injection is completed, the flow switch is switched to the production mode with the removal of associated gas from the under-packer space to the over-packer space.

The flow switch is switched from the injection mode to the production mode and gas removal through the annulus when the activating mechanism 4 interacts with the lower switching mechanism 13 (Fig. 1, 6).

The figure 1 shows the moment of interaction of the inner collet 3 with the activating mechanism 4. The petals of the inner collet 3 abut against the petals of the outer collet 2 (Fig. 2). Next, the outer collet 2 and the cylindrical body of the flow switch 8 move together along the barrel down. The petals of the outer collet 2 open into the corresponding annular groove 6 in the barrel of the packer 1. The actuating mechanism 4 is still engaged with the inner collet 3 (FIG. 3). The outer collet, falling into the annular groove in the barrel of the packer device 1, releases the activating mechanism 4 and fixes the flow switch (Fig. 4, 5). This ensures the passage of the activating mechanism 4 and the fixation of the flow switch in the opening position of the lower channels 7 (Fig. 7). When this inner collet 3 under the action of the elastic element 5 returns to its original position (Fig. 5). In this case, the lower 7 and upper 10 channels are connected through the annular space 14, and it becomes possible to discharge the gas accumulated in the under-packer annulus bypassing the sealing element of the packer device into the annular over-packer space and further into the gas pipeline. With this position of the flow selector, production is performed.

The return of the flow switch to the download mode is carried out in the reverse order due to the interaction of the upper switching mechanism 12 with the activating mechanism 4 (Fig. 7).

Claims (6)

1. The flow switch, characterized in that it is placed as part of the packer device with the formation of an annular space for communication-separation of the above-packer and under-packer annular spaces bypassing the main sealing element, it contains a hollow cylindrical body, upper and lower switching mechanisms and is mounted for movement along the barrel of the packer device due to the interaction of the activating mechanism with the switching mechanisms, while the switching mechanisms contain an outer and an inner collet, and the inner collet is located coaxially in the outer collet with the possibility of axial movement upon contact with the activating mechanism and return when its action is terminated. 2. The flow switch according to claim 1, characterized in that the cylindrical body has an inner surface covering the activating mechanism with an optimal clearance. 3. The flow switch according to claim 1, characterized in that the outer collet in the switching mechanism is made with the possibility of its fixation in the extreme positions. 4. The flow switch according to claim 1, characterized in that the tabs of the outer collet are able to release the activating mechanism when they exit into at least one corresponding annular groove or chamfer on the inner cylindrical surface of the packer barrel. 5. The flow switch according to claim 1, characterized in that the inner collet is pressed by an elastic element. 6. The flow switch according to claim 4, characterized in that the shape of the petals of the collets has at least one protrusion on the inner surface.

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