Water mixing pressure balance control device for oil well

Abstract

The utility model relates to an oil well watering pressure balance control device. According to the device, a shell is divided into a control cavity and a pressurizing cavity through a partition table; the watering channel is arranged below the pressurizing cavity and communicated with the pressurizing cavity, and the two ends of the pressurizing cavity are shrunk at the pressurizing hole and the nozzle. A balance valve is installed in the pressurizing cavity, a transmission shaft of the driven gear is connected with a valve element of the balance valve, and a valve body of the balance valve provided with a liquid flow hole is fixed in a pressurizing hole below the partition table and communicated with the inlet and the nozzle. One end of the shell provided with the driven gear is connected with a watering pipeline of an oil well mouth, and one end of the shell provided with the hydraulic oil cavity is connected with an oil conveying pipeline. Accidents such as pipeline freezing blockage and pipeline perforation caused by over-high return pressure, over-low flow speed or incapability of flowing of the oil pipeline can be effectively prevented, and the working safety and normal operation of a production flow pipe network are ensured. Pollution accidents caused by pipeline freezing blockage and pipeline perforation and loss of equipment are reduced, the environment is protected, the labor intensity of operators is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a water mixing control device for oil fields, in particular to an oil well water mixing pressure balance control device. Background Art

[0002] During the production process of oil wells, as the working conditions and auxiliary facilities in the wells continue to change, the back pressure of the oil pipeline will be affected to a certain extent by the temperature, viscosity, inner diameter and length of the conveying medium, especially for some special oil wells, such as oil wells with thick oil, slow flow rate and intermittent oil production. If the operation is not careful, it will cause irreparable losses to the entire conveying system. The site generally adopts the method of mixing water to reduce the conveying back pressure to ensure normal production. Generally, an oil pipeline is accompanied by a water mixing pipeline. The water mixing pipeline controls the oil pipeline through a valve to mix a certain amount of hot water at the wellhead to ensure that the oil well operates under a lower back pressure state.

[0003] Due to the continuous changes in oil well production, water injection into oil wells needs to be controlled at any time according to the back pressure, especially for some heavy oil wells, low water content wells, and wells with long pipelines. It is necessary to adjust the amount of water injection according to the back pressure, constant pressure, and quantity. If the operation is improper, it will cause changes in operating conditions, increased back pressure, and transportation difficulties. In severe cases, it will cause freezing and blockage of the pipeline, which increases the difficulty of daily management work.

[0004] In order to avoid the phenomenon of excessive back pressure in the oil pipeline at the production site, the water injection amount is often increased in the management of some special oil wells, which will cause biased flow, and the water injection amount of other oil wells will be too low. In severe cases, the back pressure of the oil gathering trunk line between the metering stations will increase, resulting in the damage of the external transmission pump and pipeline perforation. This requires operators to pay attention to the working status, temperature, pressure, etc. of each oil well at any time, and adjust the water injection amount of each water injection well at any time to ensure that the back pressure at the wellhead is at a normal value.

[0005] Therefore, realizing automatic control of water injection amount and ensuring the balance of wellhead pressure are urgent issues that need to be solved in the current oil well production process.

[0006] After searching, the following devices are currently related to water injection in oil wells: Authorization announcement number: CN204784844U discloses an automatic control device for water injection in intermittent oil wells in oil fields. The above utility model is composed of two parts: an adjustment component and a sealing component. The adjustment component has a cylindrical adjustment cavity, one end of which is an open oil inlet, and the other end is equipped with an adjustment cavity gland. The adjustment cavity is equipped with a valve seat, a single-flow valve core, a push rod, a linkage valve core, a reset spring and an adjustment rod in sequence from the direction of the oil inlet. The adjustment rod is connected with the push rod and extends out of the adjustment cavity gland. The rod body of the extended part is covered with a sealing component, and the end of the rod body is equipped with a hand wheel. The outer wall of the adjustment cavity is respectively provided with a water injection interface and a mixed liquid outlet and a positioning pin connected to the cavity. The use of the automatic control device for water injection in intermittent oil wells in oil fields realizes the functions of automatically controlling the amount of water injection and reducing labor intensity, improving work quality and reducing consumption.

[0007] However, the above device still has the following defects: the traditional spring valve core mainly used in the device is directly affected by the medium in the well, which will cause erosion to the control mechanism and easily lead to poor sealing; due to the use of a manually adjustable valve body, a sealing assembly needs to be installed, which may easily cause aging and leakage of the sealing assembly during long-term use, and the spring mechanism is not easy to accurately control the amount of water added.

[0008] The automatic control valve for water injection in oil production wells disclosed in the authorization announcement number CN204041003U includes a valve body, a valve core, a water injection outlet and a water injection inlet. The valve body is a hollow cylinder. A return oil pipe connection port is provided on the right side of the valve body and the return oil pipe connection port is located outside the valve body. A piston is provided on the left side of the return oil pipe connection port and the piston is located inside the valve body. A valve core A is provided on the left side of the piston and the two are tightly fitted. A water injection channel is provided inside the valve core A. A sealing ring is provided on the left side of the valve core A. A valve core B is provided on the left side of the sealing ring. A pressure spring is sleeved on the valve core B. A pressure regulating nut is provided on the left side of the valve core B and the pressure regulating nut is threadedly connected to the valve body. A water injection inlet is provided on the outer wall of the valve body. A water injection outlet is provided on the left side of the water injection inlet. A valve core B limit screw is provided on the left side of the water injection outlet and the position of the valve core B limit screw corresponds to that of the valve core B. In the entire water injection control process, the well worker does not need to control, which not only reduces the labor intensity of the employees, but also effectively ensures that the oil production well operates at a reasonable back pressure value.

[0009] However, the above device still has the following defects: the device adopts three channels, the water injection outlet and the return oil pipe connection port are both connected to the oil pipeline, the return oil pipeline is directly corroded by the medium in the oil pipeline, the internal piston and valve core are prone to corrosion and blockage, especially the spring is prone to breakage under corrosive conditions for a long time, and the valve core mechanism is prone to jamming.

[0010] In summary, although water injection control devices for oil wells have been developed, they generally have defects such as high manufacturing costs, complex structures, prone to failures, inability to achieve precise balance control of oil wells during water injection and anti-corrosion capabilities under harsh conditions, and unsatisfactory control of water injection effects.

[0011] At present, the water injection control device of oil wells still needs to be improved. Summary of the invention

[0012] The purpose of the utility model is to provide an oil well water injection pressure balance control device, which provides an oil well that needs water injection with a device that can automatically control the water injection pressure, so that the oil well's external transmission back pressure is maintained at a lower pressure value to reduce the impact of the back pressure in the oil pipeline on the oil well production, reduce the workload of employees, ensure the normal operation of oil well production, and improve economic benefits.

[0013] The technical solution of the utility model is: an oil well water injection pressure balance control device, comprising a shell, a water injection channel is arranged in the shell, wherein: the shell is divided into a control chamber and a boosting chamber by a partition; the water injection channel is arranged below the boosting chamber and communicated with the boosting chamber, and the two ends of the boosting chamber are reduced in diameter at the boosting hole and the nozzle; the two ends of the control chamber are closed by the partition and the partition, and a hydraulic oil chamber filled with hydraulic oil is arranged at one end, and a driven gear is arranged at the other end, and a diaphragm is installed on the outer side of the hydraulic oil chamber and is blocked and fixed by a sealing ring;

[0014] The spring tube installed in the control chamber is a spiral tube with one end closed and the other end fixed on the inner side of the partition and connected to the hydraulic oil chamber. The closed end of the spring tube meshes with the driven gear through the transmission tooth; a balancing valve is installed in the boosting chamber, the transmission shaft of the driven gear is connected to the valve core of the balancing valve, and the valve body of the balancing valve with a liquid flow hole is fixed in the boosting hole under the partition and connected to the inlet and the nozzle; the shell at one end of the driven gear is connected to the water injection pipeline at the wellhead of the oil well, and the shell at one end of the hydraulic oil chamber is connected to the oil pipeline.

[0015] Preferably, the boost chamber is spindle-shaped as a whole, with a pressure storage area in the middle, and the boost holes and nozzles at both ends of the boost chamber have smaller apertures than the pressure storage area in the middle, and also smaller than the maximum apertures of the inlet and the outer outlet of the nozzle.

[0016] Preferably, both ends of the pressure storage area and the inlet and outlet outside the boost hole and the nozzle are bell-mouthed; the aperture of the boost hole and the nozzle is 1 / 3 of the maximum aperture of the pressure storage area.

[0017] Preferably, the shell is circular, and the control cavity located above the partition is a semicircular inner cavity; the diaphragm and the sealing ring are both semicircular, and the diaphragm is pressed in the diaphragm pressing groove outside the control cavity by the sealing ring and bolts; the diaphragm is a stainless steel plate with a thickness of 0.8mm-1mm.

[0018] Preferably, the spiral level of the spring tube is above level; the material of the spring tube is brass and the tube wall thickness is more than 1 / 10 of the inner diameter of the tube body.

[0019] Preferably, the displacement output end of the spring tube is a closed oblate structure and is provided with a pin hole, in which the spring tube connecting pin can be inserted to connect with the transmission tooth, and there is a clearance fit between the displacement output end and the transmission tooth.

[0020] Preferably, the hydraulic oil chamber is a trumpet-shaped chamber and a hydraulic oil transfer hole that is more than 10 times smaller than the aperture of the hydraulic oil chamber is provided in the partition between the hydraulic oil chamber and the control chamber and is connected with the spring tube fixed joint through the hydraulic oil transfer hole; a hydraulic oil filling hole blocked by a screw plug is provided in the shell above the hydraulic oil chamber, and hydraulic oil can be added from the hole; the nozzles in the hydraulic oil chamber and the boosting chamber are arranged at the same end of the shell.

[0021] Preferably, the hydraulic oil filled in the hydraulic oil chamber is silicone oil or glycerin; the spring tube and the hydraulic oil chamber are connected via a spring tube fixing joint, and the spring tube fixing joint is provided with a center hole and is connected to the hydraulic oil transfer hole; the hydraulic oil chamber and the spring tube are both filled with hydraulic oil and the amount of the injected hydraulic oil is between 1 / 2 and 3 / 4 of the volume of the hydraulic oil chamber and the spring tube.

[0022] Preferably, the transmission tooth is a fan-shaped structure with a transmission handle, and the transmission tooth meshing with the driven gear is arranged at the fan-shaped end of the fan-shaped structure; the number of teeth set in the transmission tooth is equal to or greater than 1 / 2 of the number of teeth in the driven gear; the transmission handle of the transmission tooth is connected to the displacement output end of the spring tube through a spring tube connecting pin; the fan-shaped end of the transmission tooth is movably connected to the transmission tooth connecting pin fixed in the partition.

[0023] Preferably, the valve body and valve core of the balancing valve in the boosting hole are both cylindrical, the liquid flow hole is located at the center of the boosting hole between the boosting chamber and the inlet, and the diameter of the liquid flow hole is set between 2 / 5 and 2 / 3 of the radius of the valve body of the balancing valve; the water injection channel provided below the boosting chamber and the pressure storage area is a semicircular channel and can provide 0.5m for the oil pipeline. 3 / h-1.5m 3 / h of water injection volume and can manufacture water injection channels of different volumes according to the well conditions and crude oil quality.

[0024] Compared with the prior art, the remarkable effects of the utility model are as follows: the device is installed at the wellhead of the oil well and connected between the water injection pipeline and the oil pipeline. When the back pressure in the oil pipeline is higher than the set value, the water injection amount is increased through the device. When the pressure in the oil pipeline drops to the specified value, the device is used to restore the normal water injection amount. It can effectively prevent accidents such as pipeline freezing and pipeline perforation caused by excessive back pressure, slow flow rate or inability to flow in the oil pipeline, and ensure the safety and normal operation of the production process pipeline network. It can reduce the occurrence of pollution accidents and equipment losses caused by pipeline freezing and pipeline perforation, protect the environment, reduce the labor intensity of operators, and improve work efficiency.

[0025] The control chamber provided in the utility model is a fully enclosed chamber. The control mechanism composed of the driven gear, transmission gear and spring tube installed inside it will not be corroded by the medium in the well. The hydraulic oil chamber and the spring tube are filled with 1 / 2-3 / 4 hydraulic oil to meet the influence of temperature and different adjustment pressures. When the back pressure in the oil pipeline exceeds the set value, the pressure is applied to the diaphragm. At this time, the hydraulic oil plays the role of transmitting pressure, and the selected silicone oil or glycerol has good temperature stability and chemical stability, which can ensure the accuracy and reliability of the operation of the control mechanism. After the diaphragm is deformed, the hydraulic oil is compressed and the pressure is transmitted to the spring tube. At this time, the displacement output end of the spring tube pushes the transmission gear to rotate and mesh with the driven gear, thereby driving the balance valve in the boost hole to rotate. When the valve core of the balance valve is turned to the liquid flow hole and the inlet is connected to the pressure storage area, the water mixed in enters the pressure storage area from the inlet and is pressurized and then sprayed out from the nozzle, thereby achieving the purpose of boosting the oil pipeline, driving oil, and reducing the back pressure.

[0026] The water mixing channel provided in the utility model can provide 0.5m of water for the oil pipeline during the normal water mixing process. 3 / h-1.5m 3 / h of water addition amount, and the water addition channel can be customized with different flow rates for this device according to the conditions of the production site.

[0027] In addition, the diaphragm of the hydraulic oil chamber of the utility model and the hydraulic oil chamber and the nozzle are arranged at the same end of the shell, so that the installation of the device and the oil pipeline is more convenient and can be completed at one time by flange or welding.

[0028] The control chamber in the device is completely isolated from the medium in the oil pipeline, which effectively avoids the occurrence of corrosion to the device and prolongs the service life of the device.

[0029] Using this device as an auxiliary control device for oil well water injection can effectively prevent accidents such as untimely water injection adjustment and pipeline freezing and environmental pollution caused by water injection deviation due to well medium erosion, personnel misoperation, etc., effectively improve work efficiency and reduce the maintenance of oil well water injection work. It greatly improves the operating rate of the equipment, effectively prevents the impact of high back pressure of the oil pipeline on the oil well production and the resulting production accidents, ensures production safety and protects the environment. It can bring better economic benefits and has significant use effect and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the structure of the utility model.

[0032] Figure 2 yes Figure 1 Schematic diagram of the inlet structure of the shell.

[0033] Figure 3 yes Figure 1 Schematic diagram of the nozzle structure of the shell.

[0034] Figure 4 yes Figure 1 Schematic diagram of the structure of the driven gear and balance valve.

[0035] In the figure: control chamber 1, driven gear 1-1, transmission tooth 1-2, spring tube 1-3, displacement output end 1-3-1, spring tube fixing joint 1-3-2, spring tube connecting pin 1-4, transmission tooth connecting pin 1-5; boosting chamber 2, inlet 2-1, balance valve 2-2, liquid flow hole 2-2-1, pressure storage area 2-3, nozzle 2-4, boosting hole 2-5; hydraulic oil chamber 3, diaphragm 3-1, sealing ring 3-2, bolt 3-3, screw plug 3-4, hydraulic oil filling hole 3-5; water mixing channel 4. DETAILED DESCRIPTION

[0036] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present utility model. The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0037] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0038] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] See also Figures 1 to 4 , an oil well water injection pressure balance control device, comprising a shell, a water injection channel 4 is arranged in the shell, wherein: the shell is divided into a control chamber 1 and a boost chamber 2 by a partition; the water injection channel 4 is arranged below the boost chamber 2 and communicates with the boost chamber 2, and the two ends of the boost chamber 2 are reduced in diameter at the boost hole 2-5 and the nozzle 2-4; the two ends of the control chamber 1 are closed by the partition and the partition, and a hydraulic oil chamber 3 filled with hydraulic oil is arranged at one end, and a driven gear 1-1 is arranged at the other end, and a diaphragm 3-1 is installed on the outer side of the hydraulic oil chamber 3 and is blocked and fixed by a sealing ring 3-2; a spring tube 1-3 installed in the control chamber 1 It is a spiral tube with one end closed and the other end fixed on the inner side of the partition and connected with the hydraulic oil chamber 3. The closed end of the spring tube 1-3 is meshed with the driven gear 1-1 through the transmission tooth 1-2; a balancing valve 2-2 is installed in the boosting chamber 2, the transmission shaft of the driven gear 1-1 is connected with the valve core of the balancing valve 2-2, and the valve body of the balancing valve 2-2 with a liquid flow hole 2-2-1 is fixed in the boosting hole 2-5 under the partition and connected with the inlet 2-1 and the nozzle 2-4; the shell at one end of the driven gear 1-1 is connected to the water-blending pipeline at the wellhead of the oil well, and the shell at one end of the hydraulic oil chamber 3 is connected to the oil pipeline.

[0040] The utility model is connected between the water injection pipeline and the oil pipeline at the wellhead of the oil well. The housing provided with one end of the driven gear 1-1 is connected to the water injection pipeline at the wellhead of the oil well, and the housing provided with one end of the hydraulic oil chamber 3 is connected to the oil pipeline, that is, the water injection pipeline and the oil pipeline can both be connected to the boosting chamber 2 and the water injection channel 4. During normal water injection, the injected water enters the oil pipeline through the water injection channel 4.

[0041] When the back pressure in the oil pipeline is high, the back pressure compresses the diaphragm 3-1 fixed by the sealing ring 3-2 to squeeze the hydraulic oil in the hydraulic oil chamber 3 inward, so that the pressurized hydraulic oil enters the spring tube 3 to push the transmission tooth 1-2 to rotate and drive the driven gear 1-1 meshed with it, and then drives the valve core of the balance valve 2-2 located in the boosting hole 2-5 to rotate, so that the through hole in the valve core is connected with the liquid flow hole 2-2-1 in the valve body. After the mixed water in the water-mixing pipeline enters the boosting chamber 2 for boosting, the liquid flow is converted into a high-speed liquid flow, and the oil pipeline can be pressurized and flushed. When the back pressure of the oil pipeline returns to normal, the diaphragm 3-1 returns to normal, the spring tube 1-3 shortens, and the hydraulic oil therein returns to the hydraulic oil chamber 3. The spring tube 1-3 pulls the transmission tooth 1-2 to rotate in the opposite direction, and the balance valve 2-2 is closed accordingly, and normal water mixing is restored.

[0042] Through the utility model, when the back pressure in the oil pipeline is higher than the set value, the amount of water added can be increased, and when the pressure in the oil pipeline drops to the specified value, the amount of water added can be restored to the normal amount of water added. When the utility model is used to add water to the oil pipeline, there will be no deviation, and the amount of water added to other oil wells will not be low; the management personnel of the oil wells do not need to pay attention to the working status, temperature and pressure of each oil well at any time. It effectively prevents the freezing and perforation of the oil pipeline caused by excessive back pressure, slow flow rate or viscous crude oil that cannot flow, and ensures the working safety and normal operation of the production process pipeline network.

[0043] The utility model can realize automatic control of water injection in oil wells without the aid of other external forces, and the control chamber 1 is completely isolated from the medium in the oil pipeline, which effectively avoids the occurrence of corrosion to the device and prolongs the service life of the device. The dual use effects of automatic control and precise control of the amount of water injection according to the back pressure in the oil pipeline are achieved.

[0044] After using the utility model, the occurrence of pollution accidents and equipment damage caused by freezing and blocking of oil pipelines and pipeline perforation is reduced, the environment and production equipment are protected, the production cost and the workload and labor intensity of management personnel in the equipment maintenance process are effectively reduced, and the economic benefits are improved.

[0045] Based on the above embodiment 1, the utility model also has the following embodiments:

[0046] A preferred embodiment: the boost chamber 2 is spindle-shaped as a whole, with the middle part being the pressure storage area 2-3, and the apertures of the boost holes 2-5 and the nozzles 2-4 at both ends of the boost chamber 2 are smaller than the aperture of the pressure storage area 2-3 in the middle, and also smaller than the maximum aperture of the inlet 2-1 and the outer outlet of the nozzle 2-4.

[0047] A preferred embodiment: both ends of the pressure storage area 2-3 and the inlet 2-1 and outlet outside the boost hole 2-5 and the nozzle 2-4 are all bell-mouthed; the aperture of the boost hole 2-5 and the nozzle 2-4 is 1 / 3 of the maximum aperture of the pressure storage area 2-3. Due to the bell-mouth design, after the oil well water enters the pressure storage area 2-3 through the water injection pipeline, a low-speed, high-pressure liquid flow is obtained and enters the nozzle 2-4. Because its aperture is reduced again, the liquid flow is converted into a high-speed jet to pressurize and flush the blocked and slow-flowing oil pipeline. When the back pressure in the oil pipeline returns to normal, the diaphragm 3-1 returns to normal, the spring tube 1-3 shortens and pulls the transmission tooth 1-2, the driven gear 1-1 drives the valve core to rotate in the opposite direction, and the balance valve 2-2 is closed accordingly, and normal water injection is restored.

[0048] A preferred embodiment: the shell is circular, and the control chamber 1 located above the partition is a semicircular inner cavity; the diaphragm 3-1 and the sealing ring 3-2 are both semicircular, and the diaphragm 3-1 is pressed in the diaphragm pressing groove outside the control chamber 1 through the sealing ring 3-2 and the bolt 3-3; the diaphragm 3-1 is a stainless steel plate with a thickness of 0.8mm-1mm.

[0049] A preferred embodiment: the spiral level of the spring tube 1-3 is above 5; the material of the spring tube 1-3 is brass and the tube wall thickness is above 1 / 10 of the inner diameter of the tube body, and it can be extended and retracted freely under the action of hydraulic oil.

[0050] A preferred embodiment: the displacement output end 1-3-1 of the spring tube 1-3 is a closed oblate structure and is provided with a pin hole, in which the spring tube connecting pin 1-4 can be inserted to connect with the transmission tooth 1-2, and there is a clearance fit between the displacement output end 1-3-1 and the transmission tooth 1-2.

[0051] A preferred embodiment: the hydraulic oil chamber 3 is a trumpet-shaped chamber and a hydraulic oil transfer hole that is more than 10 times smaller than the aperture of the hydraulic oil chamber 3 is set in the partition between the hydraulic oil chamber 3 and the control chamber 1, and is connected with the spring tube fixed joint 1-3-2 through the hydraulic oil transfer hole to transfer hydraulic oil; a hydraulic oil filling hole 3-5 blocked by a screw plug 3-4 is provided in the shell above the hydraulic oil chamber 3, and hydraulic oil can be added from this hole; the nozzle 2-4 in the hydraulic oil chamber 3 and the boost chamber 2-2 are arranged at the same end of the shell.

[0052] A preferred embodiment: the hydraulic oil filled in the hydraulic oil chamber 3 is silicone oil or glycerin; the spring tube 1-3 and the hydraulic oil chamber 3 are connected via a spring tube fixed joint 1-3-2, and the spring tube fixed joint 1-3-2 is provided with a center hole and is connected to the hydraulic oil transfer hole; the hydraulic oil chamber 3 and the spring tube 1-3 are both filled with hydraulic oil and the amount of the injected hydraulic oil is between 1 / 2 and 3 / 4 of the volume of the hydraulic oil chamber 3 and the spring tube 1-3.

[0053] A preferred embodiment: the transmission tooth 1-2 is a fan-shaped structure with a transmission handle, and the transmission tooth 1-2 meshing with the driven gear 1-1 is arranged at the fan-shaped end of the fan-shaped structure; the number of teeth set in the transmission tooth 1-2 is equal to or greater than 1 / 2 of the number of teeth in the driven gear 1-1; the transmission handle of the transmission tooth 1-2 is connected to the displacement output end 1-3-1 of the spring tube 1-3 through the spring tube connecting pin 1-4; the fan-shaped end of the transmission tooth 1-2 is movably connected to the transmission tooth connecting pin 1-5 fixed in the partition.

[0054] A preferred embodiment: the valve body and valve core of the balancing valve 2-2 in the boosting hole 2-5 are both cylindrical, the liquid flow hole 2-2-1 is located at the center of the boosting hole 2-5 between the boosting chamber 2 and the inlet 2-1, and the diameter of the liquid flow hole 2-2-1 is set between 2 / 5 and 2 / 3 of the valve body radius of the balancing valve 2-2; the water injection channel 4 provided below the boosting chamber 2 and the pressure storage area 2-3 is a semicircular channel and can provide 0.5m for the oil pipeline 3 / h-1.5m 3 / h of water injection and can manufacture water injection channels 4 of different volumes according to the well conditions and crude oil quality. The water injection channel 4 provided in the utility model can provide 0.5m3 of water injection for the oil pipeline during the normal water injection process. 3 / h-1.5m 3 / h of water mixing amount, and water mixing channels 4 with different flow rates can also be formulated according to the actual situation of the production site.

[0055] During the normal water injection process of the oil well, the water injection control valve installed in the water injection pipeline in front of the device is opened. Due to the flow restriction of the water injection channel 4, only a certain flow of water is allowed to pass through, which can avoid the phenomenon of insufficient, excessive and biased water injection. If the working conditions in the oil pipeline change and cause the back pressure to increase, the diaphragm 3-1 will be affected by the back pressure of the oil pipeline. The diaphragm 3-1 is deformed and convex inward after being stressed, and the hydraulic oil in the hydraulic oil chamber 3 is compressed and exerts pressure on the spring tube 1-3. Since the spring tube 1-3 adopts a spiral design, the spring tube 1-3 is extended after being stressed, and the displacement output end 1-3-1 pushes the transmission tooth 1-2 with the spring tube connecting pin 1-4 as the fulcrum to rotate and mesh with the driven gear 1-1. The driven gear 1-1 drives the valve core of the balance valve 2-2 in the boost hole 2-5 to rotate until the through hole in the valve core and the liquid flow hole 2-2-1 in the valve body are connected with the inlet 2-1, the pressure storage area 2-3 and the nozzle 2-4, and the mixed water from the oil well enters the pressure storage area 2-3 through the inlet 2-1. Due to the bell mouth design, the mixed water from the oil well enters the pressure storage area 2-3 to obtain a low-speed high-pressure liquid flow. After entering the nozzle 2-4, the aperture is reduced again, and the liquid flow is converted into a high-speed jet to pressurize and flush the oil pipeline. When the back pressure of the oil pipeline returns to normal, the diaphragm 3-1 returns to normal, the spring tube 1-3 shortens and pulls the transmission tooth 1-2, the driven gear 1-1 rotates in the opposite direction, and the balance valve 2-2 is closed, and normal water mixing is restored.

[0056] The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. An oil well water injection pressure balance control device, comprising a housing, in which a water injection channel is provided, characterized in that: The shell is divided into a control chamber and a boost chamber by a partition; the water injection channel is arranged below the boost chamber and is connected to the boost chamber, and the two ends of the boost chamber are reduced in diameter at the boost hole and the nozzle; the two ends of the control chamber are closed by the partition and the partition, and a hydraulic oil chamber filled with hydraulic oil is arranged at one end, and a driven gear is arranged at the other end, and a diaphragm is installed on the outside of the hydraulic oil chamber and is blocked and fixed by a sealing ring; the spring tube installed in the control chamber is a spiral tube with one end closed and the other end fixed on the inner side of the partition and connected to the hydraulic oil chamber, and the closed end of the spring tube is meshed with the driven gear through the transmission tooth; a balancing valve is installed in the boost chamber, and the transmission shaft of the driven gear is connected to the valve core of the balancing valve, and the valve body of the balancing valve with a liquid flow hole is fixed in the boost hole below the partition and is connected to the inlet and the nozzle; the shell with one end of the driven gear is connected to the water injection pipeline at the wellhead of the oil well, and the shell with one end of the hydraulic oil chamber is connected to the oil pipeline.

2. The oil well water injection pressure balance control device according to claim 1, characterized in that: The boost chamber is spindle-shaped as a whole, with a pressure storage area in the middle. The boost holes and nozzles at both ends of the boost chamber have smaller apertures than the pressure storage area in the middle, and also smaller than the maximum apertures of the inlet and the outlet outside the nozzle.

3. The oil well water injection pressure balance control device as claimed in claim 2, characterized in that: Both ends of the pressure storage area and the inlet and outlet outside the boost hole and the nozzle are bell-mouthed; the aperture of the boost hole and the nozzle is 1 / 3 of the maximum aperture of the pressure storage area.

4. An oil well water injection pressure balance control device as claimed in claim 2 or 3, characterized in that: The shell is circular, and the control cavity located above the partition is a semicircular inner cavity; the diaphragm and the sealing ring are both semicircular, and the diaphragm is pressed in the diaphragm pressing groove outside the control cavity through the sealing ring and bolts; the diaphragm is a stainless steel plate with a thickness of 0.8mm-1mm.

5. The oil well water injection pressure balance control device according to claim 1, characterized in that: The spiral level of the spring tube is above level; the material of the spring tube is brass and the tube wall thickness is more than 1 / 10 of the inner diameter of the tube body.

6. An oil well water injection pressure balance control device as claimed in claim 1 or 5, characterized in that: The displacement output end of the spring tube is a closed oblate structure and is provided with a pin hole, in which the spring tube connecting pin can be inserted to connect with the transmission tooth, and there is a clearance fit between the displacement output end and the transmission tooth.

7. The oil well water injection pressure balance control device as claimed in claim 6, characterized in that: The hydraulic oil chamber is a trumpet-shaped chamber and a hydraulic oil transfer hole that is more than 10 times smaller than the diameter of the hydraulic oil chamber is set in the partition between the hydraulic oil chamber and the control chamber, and is connected with the spring tube fixed joint through the hydraulic oil transfer hole; a hydraulic oil filling hole blocked by a screw plug is provided in the shell above the hydraulic oil chamber, and hydraulic oil can be added from the hole; the nozzles in the hydraulic oil chamber and the boosting chamber are set at the same end of the shell.

8. The oil well water injection pressure balance control device as claimed in claim 7, characterized in that: The hydraulic oil filled in the hydraulic oil chamber is silicone oil or glycerin; the spring tube and the hydraulic oil chamber are connected by a spring tube fixing joint, and the spring tube fixing joint is provided with a center hole and communicated with the hydraulic oil transfer hole; the hydraulic oil chamber and the spring tube are both filled with hydraulic oil and the amount of the injected hydraulic oil is between 1 / 2 and 3 / 4 of the volume of the hydraulic oil chamber and the spring tube.

9. The oil well water injection pressure balance control device according to claim 6, characterized in that: The transmission tooth is a fan-shaped structure with a transmission handle, and the transmission tooth meshing with the driven gear is arranged at the fan-shaped end of the fan-shaped structure; the number of teeth set in the transmission tooth is equal to or greater than 1 / 2 of the number of teeth in the driven gear; the transmission handle of the transmission tooth is connected to the displacement output end of the spring tube through the spring tube connecting pin; the fan-shaped end of the transmission tooth is movably connected to the transmission tooth connecting pin fixed in the partition.

10. The oil well water injection pressure balance control device as claimed in claim 3, characterized in that: The valve body and valve core of the balancing valve in the boosting hole are both cylindrical, the liquid flow hole is located at the center of the boosting hole between the boosting chamber and the inlet, and the diameter of the liquid flow hole is set between 2 / 5 and 2 / 3 of the radius of the valve body of the balancing valve; the water injection channel located below the boosting chamber and the pressure storage area is a semicircular channel and can provide 0.5m for the oil pipeline. 3 / h-1.5m 3 / h of water injection volume and can manufacture water injection channels of different volumes according to the well conditions and crude oil quality.

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