Lateral double-channel multifunctional injection valve

Abstract

The invention belongs to the technical field of oil production engineering in the petroleum industry, and relates to a side-mounted double-channel multifunctional injection valve which comprises an upper connector (1), a plug guide mechanism (2), a lower connector (7) and a ball seat (4), the upper connector (1) is coaxially fixed to the inner circumferential face of a first blind hole (23), the lower end face of the ball seat (4) can be in sealed lap joint with a sealing ball (5), the sealing ball (5) is fixed to a spring (6), and the spring (6) is fixed to the lower end face of the ball seat (4). And the spring (6) is fixed with the plug guide mechanism (2). The ball seat (4) is matched with the sealing ball (5), so that the purposes of quick pressure relief, formation profile testing in the injection process and the like can be achieved. Various production testing functions such as wellhead rapid pressure relief and water injection profile can be achieved through the two channels composed of the third channel (71) and the first through hole (21), and the sand and impurity settling effect is effectively achieved in the injection process.

Description

Technical Field

[0001] The present invention relates to a technology in the field of oil production engineering in the petroleum industry, and particularly to a side-mounted dual-channel multi-functional injection valve. Background Art

[0002] During the process of maintaining stable production and improving efficiency, as well as comprehensive management in old oilfields, due to factors such as geological conditions and reservoir physical properties, the injection pressure of some water wells is high. During tubing inspection, the pressure relief period is long, and the energy replenishment process is long after water injection is resumed. Currently, during on-site construction under pressure, a plug is usually used to block the lower reservoir pressure, or a kill fluid is used to kill the well before operation. Due to the influence of the well flushing fluid or kill fluid, the production of oil wells recovers slowly after operation. For oilfields with water-sensitive and salt-sensitive reservoirs, the production drops severely after operation.

[0003] Chinese Patent Publication No. CN105003228A discloses a downhole check valve with hydraulic control and repeatable switching, belonging to the field of downhole operation tools in petroleum. The downhole check valve is composed of an outer sleeve, an upper joint, a lower joint, a baffle valve, and a piston. One end of the outer sleeve is threadedly installed with an upper joint, and the other end of the outer sleeve is threadedly installed with a lower joint. The lower joint is internally threaded with a baffle valve, and a piston is movably installed in the outer sleeve on one side of the baffle valve, and the piston is in contact connection with the baffle valve. The downhole check valve has a simple structure and good practicability. During the working process, when the check valve is in the open state, the full bore of the operation string can be achieved. By applying pressure after dropping a ball, the opening and closing of the check valve can be realized. The pressure balance above and below the valve plate can be easily achieved when the pressures above and below the valve plate are not equal; and it can be installed at any required position on the pipe string to meet the requirements of various operating environments. At the same time, it has the characteristics of convenient installation and wide application range. However, the above invention has no settlement channel and no channel for measuring sediment and impurities, and it can only open the one-way channel, without lateral input and multiple lateral injections.

[0004] Chinese Patent Publication No. CN111878033A discloses a downhole dual-channel check valve, which is arranged between two layers of coiled tubing and is connected to the bottom of the well at the right end. It includes a valve body. The left end of the valve body is provided with a first left threaded hole and a second left threaded hole. Inside the valve body, there is a second left through hole communicating with the first left threaded hole and a first left through hole communicating with the second left threaded hole. The right end of the valve body is provided with a first right threaded hole for connecting with the outer coiled tubing. Inside the valve body, at the center position of the left end of the first right threaded hole, there is a valve hole extending to the left. At the opening of the right end of the valve hole, a plug is fixedly installed. Inside the plug, there is a second right threaded hole for connecting with the inner coiled tubing. Inside the valve body, there is a second right through hole communicating with the first right threaded hole. Inside the plug, there is a first right through hole communicating with the second right threaded hole. Inside the valve hole, there is a valve control component. This check valve can effectively block the channels of the inner and outer coiled tubing in case of an accident, thereby preventing well fluid from flowing back and preventing blowout accidents. The main channels of the above-mentioned invention patent are not connected and are blocked, without the functions of sediment and impurity settlement and later measurement and adjustment.

[0005] Therefore, there is a need for a side-mounted dual-channel multi-functional injection valve that can have a sedimentation channel for sediment and impurity settlement and can enable the two channels to work simultaneously. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a side-mounted dual-channel multi-functional injection valve that can have a sedimentation channel for sediment and impurity settlement and can enable the two channels to work simultaneously.

[0007] The object of the present invention patent is to develop a side-mounted dual-channel multi-functional injection valve for the rapid pressure relief operation of injection wells, where the existing check valve or injection valve cannot meet the requirements of rapid pressure relief while achieving purposes such as formation profile testing during the injection process. This side-mounted dual-channel multi-functional injection valve can achieve various production testing functions such as rapid pressure relief at the wellhead and injection profile, effectively shortening the pressure relief and production recovery cycle of injection wells.

[0008] A side-mounted dual-channel multi-functional injection valve of the present invention includes

[0009] an upper joint, whose upper end is fixedly connected and communicated with the water inlet pipe, and a first channel is coaxially opened at its upper end;

[0010] a plug guiding mechanism, which is hermetically fixed to the upper joint. The plug guiding mechanism is provided with a second channel and a first blind hole. Both the second channel and the first blind hole can be communicated with the first channel. The first blind hole is communicated with a first through hole, and the first through hole is opened on the outer circumferential surface of the plug guiding mechanism;

[0011] a lower joint, which is hermetically fixed to the plug guiding mechanism. The lower joint is fixedly connected and communicated with the water outlet pipe, and the lower joint is provided with a third channel communicated with the second channel;

[0012] A ball seat, which is coaxially fixed to the inner circumferential surface of the first blind hole. The lower end surface of the ball seat can be hermetically lapped with a sealing ball. The sealing ball is fixed to a spring, and the spring is fixed to the plug guiding mechanism.

[0013] A side-mounted dual-channel multi-functional injection valve according to the present invention, wherein the first channel communicates with the second channel and the first blind hole through a horn-shaped channel. The large opening of the horn-shaped channel communicates with the first channel, and the small opening of the horn-shaped channel communicates with the second channel and the first blind hole.

[0014] A side-mounted dual-channel multi-functional injection valve according to the present invention, wherein the horn-shaped channel communicates with the second channel and the first blind hole through a connecting channel. The upper joint is threadedly connected to the plug guiding mechanism. The small opening of the horn-shaped channel can face the second channel, and the connecting channel faces the second channel and the first blind hole at the same time and communicates with them.

[0015] A side-mounted dual-channel multi-functional injection valve according to the present invention, wherein a filter screen is arranged between the first blind hole and the first through hole, and the filter screen is hermetically fixed to the inner circumferential surface of the first through hole.

[0016] A side-mounted dual-channel multi-functional injection valve according to the present invention, wherein the upper joint is provided with an external thread, and the plug guiding mechanism is provided with an internal thread. The internal thread and the external thread are threadedly connected, so that the upper joint and the plug guiding mechanism are hermetically fixed.

[0017] A side-mounted dual-channel multi-functional injection valve according to the present invention, wherein the lower joint is provided with an external thread, and the plug guiding mechanism is provided with an internal thread. The internal thread and the external thread are threadedly connected, so that the lower joint and the plug guiding mechanism are hermetically fixed.

[0018] A side-mounted dual-channel multi-functional injection valve according to the present invention, wherein the spherical surface of the sealing ball is provided with a rubber layer.

[0019] A side-mounted dual-channel multi-functional injection valve according to the present invention, wherein the plug guiding mechanism is fixed to the support block. The support block is in the shape of an annular cylinder, and the support block is fixed to the ball seat.

[0020] A side-mounted dual-channel multi-functional injection valve according to the present invention, wherein an O-ring is arranged between the lower joint and the plug guiding mechanism.

[0021] A side-mounted dual-channel multi-functional injection valve according to the present invention, wherein an O-ring is arranged between the upper joint and the plug guiding mechanism.

[0022] The difference between a side-mounted dual-channel multi-functional injection valve of the present invention and the prior art lies in that the side-mounted dual-channel multi-functional injection valve of the present invention can meet the purposes of rapid pressure relief and formation profile testing during the injection process through the cooperation of the above-mentioned ball seat and the sealing ball. The dual-channel composed of the third channel and the first through hole of the present invention can realize various production test functions such as rapid pressure relief at the wellhead and injection profile, effectively shortening the pressure relief and production recovery cycle of the injection well. In addition, the present invention can effectively play a role in sediment and impurity settlement during the injection process, preventing the blockage of the injection channel.

[0023] The following further describes a side-mounted dual-channel multi-functional injection valve of the present invention with reference to the accompanying drawings. Description of the Drawings

[0024] Figure 1 It is a front view cross-sectional view of a side-mounted dual-channel multi-functional injection valve.

[0025] Reference numerals in the drawings: upper joint 1, plug guiding mechanism 2, support block 3, ball seat 4, sealing ball 5, spring 6, lower joint 7, first channel 11, horn channel 12, connecting channel 13, first through hole 21, second channel 22, first blind hole 23, filter screen 24. Detailed Embodiment

[0026] As Figure 1 shown, a side-mounted dual-channel multi-functional injection valve of the present invention includes

[0027] an upper joint 1, the upper end of which is fixedly connected and communicated with the water inlet pipe, and a first channel 11 is coaxially provided at the upper end thereof;

[0028] a plug guiding mechanism 2, which is hermetically fixed to the upper joint, the plug guiding mechanism 2 is provided with a second channel 22 and a first blind hole 23, both the second channel 22 and the first blind hole 23 can be communicated with the first channel 11, the first blind hole 23 is communicated with the first through hole 21, and the first through hole 21 is provided on the outer circumferential surface of the plug guiding mechanism 2;

[0029] a lower joint 7, which is hermetically fixed to the plug guiding mechanism 2, the lower joint 7 is fixedly connected and communicated with the water outlet pipe, and the lower joint 7 is provided with a third channel 71 communicated with the second channel 22;

[0030] a ball seat 4, which is coaxially fixed to the inner circumferential surface of the first blind hole 23, the lower end surface of the ball seat 4 can be hermetically lapped with the sealing ball 5, the sealing ball 5 is fixed to the spring 6, and the spring 6 is fixed to the plug guiding mechanism 2.

[0031] The present invention can meet the requirements of rapid pressure relief and achieve purposes such as formation profile testing during the injection process through the cooperation of the ball seat 4 and the sealing ball 5. The present invention can realize various production testing functions such as rapid pressure relief at the wellhead and injection profile through the dual-channel composed of the third channel 71 and the first through hole 21, effectively shortening the pressure relief and production recovery cycle of the injection well. In addition, the present invention can effectively play a role in sediment and impurity settlement during the injection process, preventing the injection channel from being blocked.

[0032] The side-mounted dual-channel multi-functional injection valve of the present invention has two major innovations in principle compared with similar inventions. First, it can be opened in two ways: hydraulic pressure and inserting a rod. Secondly, the side-mounted single-flow design effectively increases the diameter of the internal main channel, enabling production testing such as formation profile during the normal injection process. Second, it can effectively play a role in sediment and impurity settlement during the injection process, preventing the injection channel from being blocked. The pre-set spring sealing ball avoids the risk of being unable to throw a ball to close the single-flow channel in a high-pressure formation. The inserting rod guiding design can also safely open the single-flow channel under high-pressure conditions to achieve the rapid pressure relief function of the injection well operation. The spring seal can also meet the requirement of constant-pressure injection. This tool has the characteristics of convenient installation and wide adaptability while meeting the requirements of various operating environments, greatly meeting the operating requirements of new and old oilfields.

[0033] Wherein, the plug guiding mechanism 2 can be a cylindrical body, which is externally wound around the upper joint 1 and the lower joint 7.

[0034] Among them, "can be opened in two ways: hydraulic pressure and inserting a rod" can be understood as that the present invention can insert a rod from the upper part to the lower part into the upper joint 1 to abut against the sealing ball 5, so that the sealing ball 5 is not hermetically connected to the ball seat 4, thereby directly opening the ball valve by the way of inserting the rod. The hydraulic way can be understood as that by increasing the pressure of the upper joint 1, the sealing ball 5 is not hermetically connected to the ball seat 4, thereby realizing the opening in the hydraulic way.

[0035] During use, during the on-site construction process, the pipe string is lowered into the well, the packer is set on the upper part of the production layer, and the string is released; the sealing insert pipe with a long sealing section is lowered into the well and inserted and sealed with the central pipe of the packer, controlling the high pressure in the reservoir below the packer, thereby realizing the control of the annular pressure between the casing and the tubing. During operation, block the tubing, lift the pipe string by 2m, the insert pipe is pulled out of the sealing section of the packer and the plug guiding mechanism 2, the pressure shut-off valve automatically closes, and at the same time the multi-functional injection valve automatically closes, double-acting to prevent the liquid from flowing out of the tubing channel. After confirming no pressure, lift out the pipe string.

[0036] At this time, the high pressure in the reservoir can be controlled below the packer, so as to ensure that the reservoir pressure system is not affected by the operations in the wellbore. The advantages of this multi-functional injection valve are that it does not require ball dropping during the operation, its opening and closing are not affected by the reservoir pressure, and the side-mounted double-channel design increases the diameter of the main channel. After the operation is completed, it does not need to be retrieved and can be directly used as a water injection device. At the same time, various testing instruments can be normally lowered to complete various testing operations of the water injection well.

[0037] In the normal state, the upper pressure sealing ball 5 closes the inner and outer channels. When injecting water, the channels are opened by the downward pressure relying on the pressure difference, or the channels are opened by the mechanical downward pressure of inserting the tube by the plug guiding mechanism 2, so as to meet the functions of water injection or rapid pressure relief; the lower joint 7 plays the roles of fixation and liquid channel. There are double channels designed on the upper part. The main channel realizes the flow of liquid in the pipe. The side-mounted channel reserves liquid inlet and outlet holes and a sealing cavity. The upper part of the lower joint 7 is threadedly connected to the upper joint 1.

[0038] The structure of this invention patent is reasonably designed. The side-mounted double-channel multi-functional injection valve of the present invention has a preset spring sealing ball closed and a guiding inserting tube opened. The side-mounted design increases the diameter of the main channel, ensuring the rapid control of the reservoir pressure during the water injection operation, realizing the full diameter of the operation string throughout the whole process, and at the same time, it can realize production tests such as formation profile during the injection process and effectively play the roles of sediment and sand settling, preventing the injection channel from being blocked, and meeting the requirements of various high and low pressure operation environments.

[0039] That is to say, as Figure 1 shown, a side-mounted double-channel multi-functional injection valve of the present invention includes an upper joint 1, a plug guiding mechanism 2, a support block 3, a ball seat 4, a sealing ball 5, a spring 6 and a lower joint 7;

[0040] The upper joint 1 plays a fixing role. The upper joint 1 is located at the uppermost part. The lower end of the upper joint 1 communicates with the upper end of the lower joint 7. There are two channels of different sizes inside. The channel with a larger diameter is the main channel inside the pipe. The channel with a smaller diameter is installed with a plug guiding mechanism 2 and sealed by an O-ring. The plug guiding mechanism 2 plays a guiding role and is also part of the pressure relief or injection one-way channel. It is a frustum-shaped mechanism with a larger upper diameter than the lower diameter. The upper part of the plug guiding mechanism 2 penetrates and connects to the lower part of the upper joint and is fixedly connected to the support block 3. The support block 3 plays a role in supporting the ball seat 4, connecting the upper part to the plug guiding mechanism 2 and supporting the ball seat 4 at the lower part. The ball seat 4 plays a sealing role, being fixed by the support block 3 at the upper part and having a conical sealing surface at the lower part. The sealing ball 5 plays a sealing role, being sealed with the ball seat 4 at the upper part and supported by the spring 6 at the lower part. The spring 6 plays a role in automatically closing the injection channel. In the normal state, it presses the sealing ball 5 upwards to close the inner and outer channels. When injecting water, it presses downwards to open the channel depending on the pressure difference, or when the plug guiding mechanism 2 is inserted into the pipe and mechanically pressed down to open the channel, so as to meet the functions of water injection or rapid pressure relief. The lower joint 7 plays a role in fixing and liquid channel. The upper part is designed with a double channel. The main channel realizes the liquid flow inside the pipe. The side channel reserves liquid inlet and outlet holes and a sealing cavity. The upper part of the lower joint 7 is threadedly connected to the upper joint 1.

[0041] Among them, referring to Figure 1 , the first channel 11 communicates with the second channel 22 and the first blind hole 23 through the horn-shaped channel 12. The large opening of the horn-shaped channel 12 communicates with the first channel 11, and the small opening of the horn-shaped channel 12 communicates with the second channel 22 and the first blind hole 23.

[0042] The horn-shaped channel 12 of the present invention is configured with the large opening on the upper side and the small opening on the lower side, so as to converge the water flow in the first channel 11 with a larger diameter into the second channel 22 and the first blind hole 23.

[0043] Among them, the horn-shaped channel 12 is configured with the large opening on the upper side and the small opening on the lower side, so as to converge the water flow in the first channel 11 with a larger diameter into the second channel 22 and the first blind hole 23.

[0044] Among them, referring to Figure 1 , the horn-shaped channel 12 communicates with the second channel 22 and the first blind hole 23 through the connecting channel 13. The upper joint 1 is threadedly connected to the plug guiding mechanism 2. The small opening of the horn-shaped channel 12 can be directly opposite to the second channel 22. The connecting channel 13 is directly opposite to the second channel 22 and the first blind hole 23 and communicates with them.

[0045] Through the connecting channel 13 that can face the second channel 22 and the first blind hole 23 at the same time, the horn channel 12 with a gradually decreasing channel radius can better connect the second channel 22 and the first blind hole 23 at the same time, and through the connecting channel 13, the second channel 22 and the first blind hole 23 can better communicate with the horn channel 12; at the same time, since the small opening of the horn channel 12 points to the second channel 22, the second channel 22 can transport liquid more efficiently, reduce the occurrence of turbulence in the pipeline, and improve the transportation efficiency.

[0046] When it is necessary to lift the sealing ball 5 with the inserting rod, the thread of the upper joint 1 can be rotated half a turn, so that the small opening of the horn channel 12 faces the first blind hole 23, and then the inserting rod can be directly inserted linearly to lift the sealing ball 5, so that the sealing ball 5 is not hermetically connected to the ball seat 4.

[0047] Among them, referring to Figure 1 , a filter screen 24 is arranged between the first blind hole 23 and the first through hole 21, and the filter screen 24 is hermetically fixed to the inner circumferential surface of the first through hole 21.

[0048] Through the above filter screen, the present invention can further filter the solid impurities to be filtered, or prevent the sealing ball 5 and the spring 6 from being washed away due to excessive water flow, resulting in the sealing ball 5 being unable to reset correctly.

[0049] Among them, referring to Figure 1 , the upper joint 1 is provided with an external thread, and the plug guiding mechanism 2 is provided with an internal thread, and the internal thread and the external thread are threadedly connected, so that the upper joint 1 and the plug guiding mechanism 2 are hermetically fixed.

[0050] Through the above method, the present invention can wrap the plug guiding mechanism 2 around the upper joint 1 as much as possible to protect the upper joint 1.

[0051] Among them, referring to Figure 1 , the lower joint 7 is provided with an external thread, and the plug guiding mechanism 2 is provided with an internal thread, and the internal thread and the external thread are threadedly connected, so that the lower joint 7 and the plug guiding mechanism 2 are hermetically fixed.

[0052] Through the above method, the present invention can wrap the plug guiding mechanism 2 around the lower joint 7 as much as possible to protect the lower joint 7.

[0053] Among them, referring to Figure 1 , the spherical surface of the sealing ball 5 is provided with a rubber layer.

[0054] Through the sealing ball 5 with a rubber layer on its spherical surface, the present invention can further improve the sealing performance between the sealing ball 5 and the ball seat 4.

[0055] Among them, referring toFigure 1 The plug guiding mechanism 2 is fixed to the support block 3. The support block 3 is in the shape of an annular cylinder, and the support block 3 is fixed to the ball seat 4.

[0056] In the present invention, the support block 3 plays a supporting role on the ball seat 4, so that the end face of the ball seat 4 is fixed. The outer circumferential surface of the ball seat 4 is fixed to the inner circumferential surface of the first blind hole 23 of the plug guiding mechanism 2, thereby making the fixation of the ball seat 4 more stable.

[0057] Among them, referring to Figure 1 an O-ring seal is provided between the lower joint 7 and the plug guiding mechanism 2.

[0058] Among them, referring to Figure 1 an O-ring seal is provided between the upper joint 1 and the plug guiding mechanism 2.

[0059] The above-described embodiments are merely descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design concept of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A side-mounted dual-channel multi-functional injection valve, characterized in that: It includes an upper joint (1), the upper end of which is fixedly connected and communicated with the water inlet pipe, and a first channel (11) is coaxially opened at the upper end thereof; a plug guiding mechanism (2), which is fixedly sealed with the upper joint, and the plug guiding mechanism (2) is provided with a second channel (22) and a first blind hole (23), both the second channel (22) and the first blind hole (23) can be communicated with the first channel (11), the first blind hole (23) is communicated with a first through hole (21), and the first through hole (21) is opened on the outer circumferential surface of the plug guiding mechanism (2); a lower joint (7), which is fixedly sealed with the plug guiding mechanism (2), the lower joint (7) is fixedly connected and communicated with the water outlet pipe, and the lower joint (7) is provided with a third channel (71) communicated with the second channel (22); a ball seat (4), which is coaxially fixed to the inner circumferential surface of the first blind hole (23), the lower end surface of the ball seat (4) can be hermetically lapped with a sealing ball (5), the sealing ball (5) is fixed to a spring (6), and the spring (6) is fixed to the plug guiding mechanism (2).

2. A side-mounted dual-channel multi-functional injection valve according to claim 1, characterized in that: The first channel (11) is communicated with the second channel (22) and the first blind hole (23) through a horn-shaped channel (12), the large opening of the horn-shaped channel (12) is communicated with the first channel (11), and the small opening of the horn-shaped channel (12) is communicated with the second channel (22) and the first blind hole (23).

3. A side-mounted dual-channel multi-functional injection valve according to claim 2, characterized in that: The horn-shaped channel (12) is communicated with the second channel (22) and the first blind hole (23) through a connecting channel (13), the upper joint (1) is threadedly connected to the plug guiding mechanism (2), the small opening of the horn-shaped channel (12) can face the second channel (22), and the connecting channel (13) faces the second channel (22) and the first blind hole (23) at the same time and is communicated with them.

4. A side-mounted dual-channel multi-functional injection valve according to claim 3, characterized in that: A filter screen (24) is arranged between the first blind hole (23) and the first through hole (21), and the filter screen (24) is fixedly sealed to the inner circumferential surface of the first through hole (21).

5. A side-mounted dual-channel multi-functional injection valve according to claim 4, characterized in that: The upper joint (1) is provided with an external thread, the plug guiding mechanism (2) is provided with an internal thread, and the internal thread and the external thread are threadedly connected, so that the upper joint (1) is fixedly sealed with the plug guiding mechanism (2).

6. A side-mounted dual-channel multi-functional injection valve according to claim 5, characterized in that: The lower joint (7) is provided with an external thread, the plug guiding mechanism (2) is provided with an internal thread, and the internal thread and the external thread are threadedly connected, so that the lower joint (7) is fixedly sealed with the plug guiding mechanism (2).

7. A side-mounted dual-channel multi-functional injection valve according to claim 6, characterized in that: a rubber layer is disposed on the spherical surface of the sealing ball (5).

8. A side-mounted dual-channel multi-functional injection valve according to claim 7, characterized in that: the plug guiding mechanism (2) is fixed to the support block (3), the support block (3) is in a ring-shaped cylinder shape, and the support block (3) is fixed to the ball seat (4).

9. A side-mounted dual-channel multi-functional injection valve according to claim 8, characterized in that: an O-ring seal is provided between the lower joint (7) and the plug guiding mechanism (2).

10. A side-mounted dual-channel multi-functional injection valve according to claim 9, characterized in that: an O-ring seal is provided between the upper joint (1) and the plug guiding mechanism (2).

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