Water injection sealing device for oil field

Abstract

The water injection sealing device for the oil field comprises a water injection main pipeline with the top end of a plugging structure, water adding pipes are fixedly communicated with the two sides of the water injection main pipeline, a first buffering force unloading mechanism is installed in the water injection main pipeline, and a second buffering force unloading mechanism is fixedly installed in each water adding pipe. An internal thread sleeve is fixedly sleeved with the water adding pipe, and an external thread connecting pipe head is sleeved with the internal thread sleeve in a threaded mode. Through the arrangement of a series of structures, plugging of the conical hole can be automatically relieved in an extrusion mode when the external thread connecting pipe head is connected for water supply, stable plugging can be automatically conducted on the conical hole when water supply is stopped and the external thread connecting pipe head is taken down, manual plugging is not needed, the automation degree is improved, and the labor intensity of workers is reduced. And in addition, when the tightening plugging force is reduced, an alarm can be given in time to remind personnel to adjust, and the subsequent plugging stability is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water injection sealing equipment, in particular to a water injection sealing device for oil fields. Background Art

[0002] Injection wells are wells used to inject water into oil layers. During the development of oil fields, water is injected into the reservoir through special injection wells to maintain or restore the pressure of the oil layers, so that the reservoir has a strong driving force to increase the production speed and recovery rate of the oil reservoir. When the injection well is used, when water is injected into the oil field, when the internal pressure of the oil field is too high, it is easy to cause backflow, thereby causing oil to leak through the injection wellhead. In order to seal the wellhead, the existing method of using sealing plugs and valves to seal the wellhead is mostly adopted. However, the above-mentioned method of using sealing plugs and valves to seal the wellhead will directly affect the squeezing of the reflux liquid. The sealing wellhead lacks a buffer pressure relief device, and the squeezing force of the reflux liquid directly acts on the sealing plug and valve, which causes the sealing plug and valve to be damaged and deformed by the pressure, resulting in the sealing plug and valve not closing tightly. For this reason, the application number is: 202320725 859.3 discloses a water injection sealing device for oil fields, including a main pipeline arranged vertically, and the bottom end of the main pipeline is sealed and fixedly connected to the wellhead, and the outer circumferential surface of the main pipeline is evenly connected to multiple water supply pipes in the vertical direction, and the ends of the multiple water supply pipes are connected to valves; a buffer cylinder in the buffer member is vertically connected and fixed to the top of the main pipeline, and the inside of the buffer cylinder is vertically slidably inserted in the main pipeline and provided with a sealing plug, the top of the sealing plug vertically slides through the top of the buffer cylinder and is fixed with a guide rod, and the upper part of the guide rod is sleeved with a first spring; it overcomes the existing method of using a sealing plug and a valve to seal the wellhead, the sealing wellhead lacks a buffer pressure relief device, the extrusion force of the reflux liquid directly acts on the sealing plug and the valve, affecting the sealing accuracy of the sealing plug and the valve in later use, and at the same time, the sealing plug and the valve are squeezed and damaged and deformed, which also causes the problem that the sealing plug and the valve are difficult to operate in the later period;

[0003] The oil field water injection sealing device disclosed in the above patent can buffer the impact force through the provided buffer member, and will not affect the valve and the sealing plug. However, the existing oil field water injection sealing device, the valve at the water pipe port is usually a manual valve. When the water injection is stopped, the person needs to manually turn it to close it. The degree of automation is low, and there is a risk of leakage due to incomplete tightening. The sealing effect is not ideal. (The leakage is mainly reflected in the leakage during water reflux. In addition, although the provided buffer member can achieve the purpose of sealing when the impact force is large, it cannot be sealed when the impact force is small. The water will still flow into the valve, resulting in water flowing out of the valve that has not been screwed into place). In order to improve the valve problem, we have proposed a water injection sealing device for oil fields. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a water injection sealing device for oil fields.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A water injection sealing device for oil fields, comprising a water injection main pipe with a plugging structure at the top, water supply pipes are connected and fixed on both sides of the water injection main pipe, a first buffer unloading mechanism is installed in the water injection main pipe, and a second buffer unloading mechanism is fixedly installed in the water supply pipe, and the impact force of water reflux can be buffered and unloaded by the first buffer unloading mechanism and the second buffer unloading mechanism. The specific movement process has been mentioned in the patent with application number 202320725859.3, and will not be elaborated here, an internal threaded sleeve is provided in the fixed sleeve of the water supply pipe, and the internal threaded sleeve is provided with an external threaded connecting pipe head, and the external threaded connecting pipe head can achieve the purpose of water supply when connected to an external water supply pipe, and an adjustable automatic plugging sealing mechanism is also installed in the water supply pipe;

[0007] The adjustable automatic plugging and sealing mechanism includes a plugging component fixedly installed in the water filling pipe, the plugging component is used to plug the water filling pipe, and the side of the plugging component away from the water injection main pipe is fixedly connected to an elastic guide drive component, and the elastic guide drive component plays a lateral guiding and driving effect on the corresponding plugging component. The externally threaded connecting pipe head cooperates with the corresponding elastic guide drive component, and the bottom of the elastic guide drive component is fixedly connected to a positioning rod slidably installed on the inner wall of the bottom of the corresponding water filling pipe. The top of the elastic guide drive component is fixedly connected to a threaded drive component, and the threaded drive component is used to adjust the elastic guide drive component. The water filling pipe is sleeved on the threaded drive component, and the top of the water filling pipe is fixedly connected to a control reminder component, and the control reminder component is electrically connected to the elastic guide drive component.

[0008] Preferably, the first buffer unloading mechanism includes a piston sealingly and slidably mounted in the water injection main pipe, the top of the piston is fixedly connected to a T-shaped guide rod, the top of the T-shaped guide rod slides and extends above the water injection main pipe, a first buffer spring is fixedly connected between the top inner wall of the T-shaped guide rod and the top of the water injection main pipe, the first buffer spring is movably mounted on the T-shaped guide rod, and under the elastic force of the first buffer spring, the upward impact force of the return water can be buffered and unloaded.

[0009] Preferably, the second buffer unloading mechanism includes a sealing ring fixedly installed in the water filling pipe, the inner side of the sealing ring is set to a conical structure, and a first conical rubber block is provided on the side of the sealing ring close to the water injection main pipe, the first conical rubber block is adapted to the corresponding inner side of the sealing ring, the top and bottom of the first conical rubber block are fixedly connected with L-shaped guide rods, the sealing ring is slidably sleeved on the corresponding two L-shaped guide rods, and a second buffer spring is fixedly connected between the inner wall of the L-shaped guide rod on the side away from the water injection main pipe and the corresponding sealing ring, and the second buffer spring is used to buffer and unload the impact force of the lateral flow of water.

[0010] Preferably, the sealing assembly includes a mounting block fixedly installed in the water filling pipe, the mounting block is located on the side of the corresponding sealing ring away from the water injection main pipe, a conical hole is provided on the side of the mounting block close to the corresponding sealing ring, a second conical rubber block is movable sleeved in the conical hole, and the second conical rubber block is used to seal the corresponding conical hole.

[0011] Preferably, the elastic guide drive assembly includes a first guide rod, one end of the first guide rod close to the corresponding mounting block is fixedly connected to the second conical rubber block, the first guide rod one end away from the corresponding mounting block extends into the internal threaded sleeve and is fixedly connected to a thin vertical rod, the first guide rod is slidingly sleeved with an adjusting guide block, the first guide rod and the adjusting guide block cooperate to provide a lateral guiding effect on the second conical rubber block, the bottom of the adjusting guide block is fixedly connected to the top of the corresponding positioning rod, a pressure sensor is embedded and fixed on one side of the thin vertical rod close to the corresponding mounting block, a compression spring in a compressed state is fixedly connected between the side of the adjusting guide block away from the corresponding second conical rubber block and the pressure sensor, the pressure sensor is used to detect the extrusion force of the corresponding compression spring, the compression spring is movably sleeved on the corresponding first guide rod, and the thin vertical rod cooperates with the externally threaded connecting pipe head.

[0012] Preferably, the threaded drive assembly includes a moving rod, the bottom end of the moving rod is fixedly connected to the top of the corresponding adjusting guide block, an installation groove is opened on the top inner wall of the water filling pipe, a T-shaped screw is rotatably installed between the inner walls on both sides of the installation groove, the moving rod is threadedly sleeved on the corresponding T-shaped screw, and the moving rod and the corresponding T-shaped screw are threadedly connected in such a way that the moving rod can move in position while the T-shaped screw rotates, the T-shaped screw extends to the outside of the water filling pipe away from the side of the water injection main pipe, and the water filling pipe is rotatably sleeved on the corresponding T-shaped screw.

[0013] Preferably, the control reminder component includes a controller fixedly connected to the top of the water filling pipe, and a sound and light alarm is fixedly connected to the top of the controller. The controller is electrically connected to the corresponding sound and light alarm and pressure sensor. The controller is used to receive the signal of the pressure sensor and control the sound and light alarm to alarm and remind personnel.

[0014] Compared with the existing technology, the beneficial effects of the utility model are:

[0015] 1. Through the coordination of the plugging component and the elastic guide drive component, the plugging of the tapered hole can be automatically released by squeezing the thin vertical rod when the external threaded connection pipe head is connected, and the tapered hole can be automatically plugged when the external threaded connection pipe head is removed after the water supply is stopped. There is no need for personnel to manually tighten the plugging, which improves the degree of automation. After plugging, the tension of the compression spring is used to achieve stable plugging, which can effectively reduce the risk of water leakage;

[0016] 2. By adjusting the guide block, pressure sensor, threaded drive assembly and control reminder assembly, when the elastic force of the compression spring weakens and the tensioning force decreases, an alarm will be sounded in time to remind personnel to adjust the tensioning force, thereby further improving the subsequent blocking stability;

[0017] The utility model adopts a series of structural settings, which can automatically release the blockage of the tapered hole by squeezing when the external threaded connecting pipe head is connected to supply water, and can automatically and stably block the tapered hole when the water supply is stopped and the external threaded connecting pipe head is removed, without the need for personnel to manually tighten the blockage separately, thereby improving the degree of automation. In addition, when the tightening sealing force is reduced, an alarm can be issued in time to remind personnel to make adjustments, thereby further improving the stability of subsequent blocking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a water injection sealing device for oil fields proposed by the utility model;

[0019] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of ;

[0020] Figure 3 It is a three-dimensional structural schematic diagram of the connection state of the internal thread sleeve of the water injection sealing device for oil fields and some components in the adjustable automatic plugging sealing mechanism proposed by the utility model;

[0021] Figure 4 for Figure 3 Schematic diagram of the left view structure;

[0022] Figure 5 for Figure 2 Schematic diagram of the enlarged structure of part A.

[0023] In the figure: 100, water injection main pipeline; 101, water supply pipe; 102, piston; 103, T-shaped guide rod; 104, first buffer spring; 105, external thread connecting pipe head; 106, sealing ring; 107, first conical rubber block; 108, L-shaped guide rod; 109, second buffer spring; 1, mounting block; 2, second conical rubber block; 3, internal thread sleeve; 4, adjustment guide block; 5, thin vertical rod; 6, pressure sensor; 7, compression spring; 8, first guide rod; 9, positioning rod; 10, mounting groove; 11, moving rod; 12, T-shaped screw; 13, controller; 14, sound and light alarm; 15, conical hole. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] Reference Figure 1-5 A water injection sealing device for oil fields includes a water injection main pipe 100 with a plugging structure at the top, and water supply pipes 101 are connected and fixed on both sides of the water injection main pipe 100. A first buffer unloading mechanism is installed in the water injection main pipe 100, and a second buffer unloading mechanism is fixedly installed in the water supply pipe 101. The impact force of water reflux can be buffered and unloaded by the first buffer unloading mechanism and the second buffer unloading mechanism. The specific movement process has been mentioned in the patent application number 202320725859.3, and will not be elaborated here. The first The buffer unloading mechanism includes a piston 102 which is sealed and slidably sleeved in the water injection main pipe 100, the top of the piston 102 is fixedly connected with a T-shaped guide rod 103, the top of the T-shaped guide rod 103 slides and extends to the top of the water injection main pipe 100, and a first buffer spring 104 is fixedly connected between the top inner wall of the T-shaped guide rod 103 and the top of the water injection main pipe 100, the first buffer spring 104 is movably sleeved on the T-shaped guide rod 103, and under the elastic force of the first buffer spring 104, the upward impact force of the return water can be buffered and unloaded;

[0026] The second buffer unloading mechanism includes a plugging ring 106 fixedly installed in the water supply pipe 101, the inner side of the plugging ring 106 is set as a conical structure, and a first conical rubber block 107 is provided on the side of the plugging ring 106 close to the water injection main pipeline 100, and the first conical rubber block 107 is adapted to the inner side of the corresponding plugging ring 106. The top and bottom of the first conical rubber block 107 are fixedly connected with L-shaped guide rods 108, and the plugging ring 106 is slidably sleeved on the corresponding two L-shaped guide rods 108. A second buffer spring 109 is fixedly connected between the inner wall of the L-shaped guide rod 108 on the side away from the water injection main pipeline 100 and the corresponding plugging ring 106, and the second buffer spring 109 is used to buffer and unload the impact force of the lateral flow of water;

[0027] The fixed sleeve in the water supply pipe 101 is provided with an internal thread sleeve 3, and the internal thread sleeve 3 is provided with an external thread connection pipe head 105. When the external thread connection pipe head 105 is connected to the external water supply pipe, the purpose of water supply can be achieved. An adjustable automatic plugging and sealing mechanism is also installed in the water supply pipe 101;

[0028] The adjustable automatic plugging and sealing mechanism comprises a plugging assembly fixedly installed in the water supply pipe 101, wherein the plugging assembly comprises a mounting block 1 fixedly installed in the water supply pipe 101, the mounting block 1 is located on the side of the corresponding plugging ring 106 away from the water injection main pipe 100, a tapered hole 15 is provided on the side of the mounting block 1 close to the corresponding plugging ring 106, a second tapered rubber plugging block 2 is movably sleeved in the tapered hole 15, and the second tapered rubber plugging block 2 is used to plug the corresponding tapered hole 15;

[0029] The second conical rubber block 2 is fixedly connected to a side away from the water injection main pipe 100 with an elastic guide drive component, and the external threaded connection pipe head 105 cooperates with the corresponding elastic guide drive component. The elastic guide drive component includes a first guide rod 8, and the first guide rod 8 is fixedly connected to the second conical rubber block 2 at one end close to the corresponding mounting block 1. The first guide rod 8 extends into the internal threaded sleeve 3 at one end away from the corresponding mounting block 1 and is fixedly connected with a thin vertical rod 5. An adjustment guide block 4 is slidably sleeved on the first guide rod 8, wherein a guide hole that is slidably sleeved with the outer side of the first guide rod 8 is opened on one side of the adjustment guide block 4. The first guide rod 8 and the adjustment guide block 4 cooperate to play the second conical rubber block 2 To achieve the effect of lateral guidance, a pressure sensor 6 is embedded and fixed on one side of the thin vertical rod 5 close to the corresponding mounting block 1, and a compression spring 7 in a compressed state is fixedly connected between the side of the adjusting guide block 4 away from the corresponding second conical rubber block 2 and the pressure sensor 6. The compression spring 7 in a compressed state will exert a tightening force on the corresponding pressure sensor 6, so that a continuous tightening force can be exerted on the second conical rubber block 2 through the thin vertical rod 5 and the first guide rod 8 in turn, thereby improving the sealing stability. The pressure sensor 6 is used to detect the extrusion tightening force of the corresponding compression spring 7. The compression spring 7 is movably sleeved on the corresponding first guide rod 8, and the thin vertical rod 5 cooperates with the externally threaded connecting pipe head 105;

[0030] The bottom of the adjusting guide block 4 is fixedly connected with a positioning rod 9 which is slidably installed with the bottom inner wall of the corresponding water supply pipe 101, wherein a T-shaped slide rail is fixedly connected to the bottom inner wall of the water supply pipe 101, and the bottom end of the positioning rod 9 is provided with a T-shaped slide groove with openings on both sides, and the T-shaped slide rail is connected with the corresponding T-shaped slide groove, and the top of the adjusting guide block 4 is fixedly connected with a threaded drive component, and the water supply pipe 101 is sleeved on the threaded drive component, wherein the threaded drive component includes a moving rod 11, and the bottom end of the moving rod 11 is fixedly connected with the top of the corresponding adjusting guide block 4, and a mounting groove 10 is provided on the top inner wall of the water supply pipe 101, and a T-shaped screw 12 is rotatably installed between the inner walls on both sides of the mounting groove 10, and the moving rod 11 is threadedly sleeved on the corresponding T-shaped screw 12, wherein one side of the moving rod 11 is provided with a corresponding The threaded hole of the T-shaped screw 12 is threadedly connected, and the moving rod 11 is threadedly connected to the corresponding T-shaped screw 12 through the threaded hole. The moving rod 11 can move its position while the T-shaped screw 12 rotates. The T-shaped screw 12 extends to the outside of the water supply pipe 101 away from the side of the water injection main pipe 100, and the water supply pipe 101 is rotatably sleeved on the corresponding T-shaped screw 12, wherein a first bearing is fixedly connected to the inner wall of the side of the installation groove 10 close to the water injection main pipe 100, and a mounting hole is opened on the inner wall of the side of the installation groove 10 away from the water injection main pipe 100, and two sealed bearings are fixedly sleeved in the mounting hole, and the inner side of the inner ring of the sealed bearing and the inner side of the inner ring of the first bearing are fixedly connected to the outer side of the corresponding T-shaped screw 12, and the first bearing and the sealed bearing play the effect of providing the T-shaped screw 12 with a rotatable installation;

[0031] A control reminder component is fixedly connected to the top of the water filling pipe 101, and the control reminder component includes a controller 13 fixedly connected to the top of the water filling pipe 101, and a sound and light alarm 14 is fixedly connected to the top of the controller 13. The controller 13 is electrically connected to the corresponding sound and light alarm 14 and the pressure sensor 6. The controller 13 is used to receive the signal of the pressure sensor 6 and control the sound and light alarm 14 to alarm and remind personnel. Its control principle is the existing technology and is not elaborated here in detail; the utility model can automatically release the blockage of the tapered hole 15 by squeezing when the external threaded connecting pipe head 105 is connected to supply water through a series of structural settings, and can automatically and stably block the tapered hole 15 when the water supply is stopped and the external threaded connecting pipe head 105 is removed, without the need for personnel to manually tighten the blockage separately, thereby improving the degree of automation. In addition, when the tightening sealing force is reduced, an alarm can be issued in time to remind personnel to make adjustments, thereby further improving the subsequent sealing stability.

[0032] Working principle: The impact force of water backflow can be buffered and unloaded by the first buffer unloading mechanism and the second buffer unloading mechanism. The specific movement process has been mentioned in the patent application number 202320725859.3, and will not be elaborated here;

[0033] When in use, the external threaded connecting pipe head 105 is connected to the external water supply pipe. When the external threaded connecting pipe head 105 is connected to the corresponding internal threaded sleeve 3, the external threaded connecting pipe head 105 can be directly rotated into the internal threaded sleeve 3. During the movement of the external threaded connecting pipe head 105, the corresponding thin vertical rod 5 will be squeezed. Under the squeezing force, the thin vertical rod 5 drives the second tapered rubber block 2 to move and release the blockage of the tapered hole 15 through the corresponding first guide rod 8. The thin vertical rod 5 also compresses the compression spring 7 through the corresponding pressure sensor 6. When the external threaded connecting pipe head 105 moves to the required position, the second tapered rubber block 2 completely releases the blockage of the corresponding tapered hole 15, so that the water inside the external water supply pipe enters the water injection main pipeline 100 through the corresponding external threaded connecting pipe head 105, the tapered hole 15 and the sealing ring 106 in turn. After the water is added, when the water supply needs to be stopped, the external threaded connecting pipe head 105 is rotated in the opposite direction so that the external threaded connecting pipe head 105 When the external threaded connecting pipe head 105 is transformed to move in the direction away from the water injection main pipe 100, the squeezing force on the corresponding thin vertical rod 5 is relaxed when the external threaded connecting pipe head 105 moves. At this time, the elastic force of the compression spring 7 in the compressed state drives the second conical rubber plug 2 to move and block the conical hole 15 through the corresponding pressure sensor 6, the thin vertical rod 5 and the first guide rod 8 in turn, thereby achieving the purpose of automatically blocking the conical hole 15 when the external threaded connecting pipe head 105 is removed. The degree of automation is improved by the automatic blocking method, and there is no need for personnel to manually tighten the blockage separately. After blocking, the compression spring 7 in the compressed state will always give the pressure sensor 6 a tightening force, thereby giving the corresponding second conical rubber plug 2 a tightening force away from the water injection main pipe 100 through the thin vertical rod 5 and the first guide rod 8 in turn, so that the second conical rubber plug 2 can always be in close contact with the inner wall of the conical hole 15, thereby improving the blocking stability and effectively reducing the risk of water leakage.

[0034] The pressure threshold for opening the sound and light alarm 14 is set in advance through the controller 13. After long-term use, the compression spring 7 is prone to elastic fatigue and weakening of the elastic force, thereby reducing the tightening force of the second conical rubber block 2, affecting the sealing stability. When the elastic force of the compression spring 7 weakens, the tightening force of the pressure sensor 6 is reduced. The pressure sensor 6 detects its tightening force and transmits the detected pressure value to the controller 13. When its pressure value is lower than the preset value, the controller 13 controls the sound and light alarm 14 to turn on to remind personnel. After hearing the alarm, the personnel can rotate the T-shaped screw 12 in the forward direction. Under the action of the threaded hole opened on the moving rod 11, the T-shaped screw 12 rotates while driving the corresponding moving rod. 11 moves in the direction away from the mounting block 1, the moving rod 11 drives the corresponding adjusting guide block 4 to slide on the first guide rod 8 and compress the compression spring 7, the compression spring 7 squeezes the thin vertical rod 5 through the corresponding pressure sensor 6, and the thin vertical rod 5 squeezes the second conical rubber block 2 through the corresponding first guide rod 8, so that the second conical rubber block 2 is in close contact with the inner wall of the corresponding conical hole 15 again. When the pressure sensor 6 detects that its squeezing force reaches the preset value, the controller 13 controls the sound and light alarm 14 to turn off, and the personnel can stop rotating the T-shaped screw 12, thereby achieving the purpose of adjusting the elastic force of the compression spring 7 when its elastic force becomes weak, thereby improving the subsequent blocking stability.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A water injection sealing device for oil fields, comprising a water injection main pipeline (100) with a plugging structure at the top, and water supply pipes (101) are connected and fixed on both sides of the water injection main pipeline (100), characterized in that: A first buffer unloading mechanism is installed in the water injection main pipeline (100), a second buffer unloading mechanism is fixedly installed in the water supply pipe (101), an internal threaded sleeve (3) is fixedly provided in the water supply pipe (101), an external threaded connecting pipe head (105) is provided in the internal threaded sleeve (3), and an adjustable automatic plugging sealing mechanism is also installed in the water supply pipe (101); The adjustable automatic plugging and sealing mechanism comprises a plugging component fixedly installed in a water filling pipe (101); a side of the plugging component away from the water injection main pipe (100) is fixedly connected to an elastic guide drive component; an externally threaded connection pipe head (105) cooperates with the corresponding elastic guide drive component; a positioning rod (9) slidably installed on the bottom inner wall of the corresponding water filling pipe (101) is fixedly connected to the bottom of the elastic guide drive component; a threaded drive component is fixedly connected to the top of the elastic guide drive component; the water filling pipe (101) is sleeved on the threaded drive component; a control reminder component is fixedly connected to the top of the water filling pipe (101); and the control reminder component is electrically connected to the elastic guide drive component.

2. The oilfield water injection sealing device according to claim 1, characterized in that: The first buffer unloading mechanism comprises a piston (102) sealingly and slidably sleeved in a water injection main pipe (100); the top of the piston (102) is fixedly connected to a T-shaped guide rod (103); the top of the T-shaped guide rod (103) slides and extends above the water injection main pipe (100); a first buffer spring (104) is fixedly connected between the top inner wall of the T-shaped guide rod (103) and the top of the water injection main pipe (100); the first buffer spring (104) is movably sleeved on the T-shaped guide rod (103).

3. The water injection sealing device for oil field according to claim 2, characterized in that: The second buffer unloading mechanism comprises a plugging ring (106) fixedly installed in the water supply pipe (101), the inner side of the plugging ring (106) is set as a conical structure, and a first conical rubber block (107) is provided on the side of the plugging ring (106) close to the water injection main pipeline (100), the first conical rubber block (107) is adapted to the inner side of the corresponding plugging ring (106), the top and bottom of the first conical rubber block (107) are fixedly connected with L-shaped guide rods (108), the plugging ring (106) is slidably mounted on the two corresponding L-shaped guide rods (108), and a second buffer spring (109) is fixedly connected between the inner wall of the L-shaped guide rod (108) on the side away from the water injection main pipeline (100) and the corresponding plugging ring (106).

4. The oil field water injection sealing device according to claim 3, characterized in that: The plugging assembly comprises a mounting block (1) fixedly mounted in a water supply pipe (101); the mounting block (1) is located on a side of a corresponding plugging ring (106) away from a water injection main pipe (100); a conical hole (15) is provided on a side of the mounting block (1) close to the corresponding plugging ring (106); a second conical rubber plugging block (2) is movably sleeved in the conical hole (15).

5. The oil field water injection sealing device according to claim 4, characterized in that: The elastic guide drive assembly comprises a first guide rod (8), one end of the first guide rod (8) close to the corresponding mounting block (1) is fixedly connected to the second conical rubber block (2), one end of the first guide rod (8) away from the corresponding mounting block (1) extends into the internal thread sleeve (3) and is fixedly connected to a thin vertical rod (5), an adjustment guide block (4) is slidably sleeved on the first guide rod (8), the bottom of the adjustment guide block (4) is fixedly connected to the top of the corresponding positioning rod (9), a pressure sensor (6) is embedded and fixed on one side of the thin vertical rod (5) close to the corresponding mounting block (1), a compression spring (7) in a compressed state is fixedly connected between the side of the adjustment guide block (4) away from the corresponding second conical rubber block (2) and the pressure sensor (6), the compression spring (7) is movably sleeved on the corresponding first guide rod (8), and the thin vertical rod (5) cooperates with the external threaded connection pipe head (105).

6. The oil field water injection sealing device according to claim 5, characterized in that: The threaded drive assembly comprises a moving rod (11), the bottom end of the moving rod (11) is fixedly connected to the top of the corresponding adjusting guide block (4), a mounting groove (10) is provided on the top inner wall of the water adding pipe (101), a T-shaped screw rod (12) is rotatably mounted between the inner walls on both sides of the mounting groove (10), the moving rod (11) is threadedly sleeved on the corresponding T-shaped screw rod (12), the T-shaped screw rod (12) extends to the outside of the water adding pipe (101) away from the side of the water injection main pipe (100), and the water adding pipe (101) is rotatably sleeved on the corresponding T-shaped screw rod (12).

7. The oil field water injection sealing device according to claim 6, characterized in that: The control reminder component comprises a controller (13) fixedly connected to the top of the water supply pipe (101), the top of the controller (13) is fixedly connected to an audible and visual alarm (14), and the controller (13) is electrically connected to the corresponding audible and visual alarm (14) and the pressure sensor (6).

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