Double-fixed-water-nozzle type stepless-adjustment adjustable constant-flow blanking plug

Abstract

The invention relates to the technical field of oil production engineering, in particular to a double-fixed-water-nozzle type stepless-adjustment adjustable constant-flow blanking plug which is characterized in that a plunger main body and a water injection rate adjusting mechanism are arranged in a blanking plug main body, and an elastic piece is arranged between the top end of the plunger main body and the inner top of the blanking plug main body; the water injection rate adjusting mechanism is arranged below the plunger main body, a water outlet is formed in the side wall of the blanking plug main body, and the water injection rate adjusting mechanism adjusts the flow of liquid entering the plunger main body; when the pressure of the liquid entering the plunger main body exceeds the preset pressure, the plunger main body is pushed to move to partially shield the water outlet, so that the liquid outlet flow of the water outlet is the preset flow; when the liquid pressure is smaller than the preset pressure, the elastic piece pushes the plunger body to move through elastic release, the shielding area of the water outlet is reduced, and the liquid outlet flow is the preset flow. Automatic constant flow adjustment of the water outlet flow changing along with underground pressure can be achieved, the flow adjustment mode is simpler and more convenient, and then the construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of oil production engineering technology, and in particular to a dual-fixed water nozzle type stepless adjustable constant flow plug. Background Technology

[0002] Constant flow injection technology enables constant flow injection under frequent pressure fluctuations, effectively reducing the number of testing and adjustment stages and alleviating testing workload. Existing adjustable constant flow plugs can adjust flow rates within a range of 10-70 m³ / d by adjusting the fit between the cone valve and the plunger cap, achieving constant flow injection and effectively reducing testing workload. However, the following problems exist in field applications: First, the fit between the cone valve and the plunger cap is unreasonable, resulting in low flow control accuracy and difficulty in field adjustment; second, the flow area of ​​the cone valve and plunger cap is annular, which, compared to the circular nozzle of the constant flow plug, has a weaker ability to pass impurities with the same flow area, making it prone to clogging; third, compared to ordinary adjustable plugs, adjustable constant flow plugs lack a free-spinning mechanism, and further adjustment after the cone valve is adjusted to its maximum or minimum will result in the adjustment rod breaking. These problems seriously affect the process applicability and service life of the adjustable constant flow plug. Summary of the Invention

[0003] This invention proposes a dual-fixed water nozzle type stepless adjustable constant flow blocker to solve the problems of low flow control accuracy, high adjustment difficulty, weak impurity passage capacity, easy jamming, lack of idling structure, and easy breakage of adjustment rod in existing adjustable constant flow blockers.

[0004] According to one aspect of the present invention, a dual-fixed water nozzle type stepless adjustable constant flow plug is provided, comprising: a plunger body and a water injection volume adjustment mechanism; The plunger body and the water injection adjustment mechanism are disposed inside the blocker body, and an elastic element is provided between the top of the plunger body and the top of the blocker body. The water injection volume adjustment mechanism is located below the plunger body, and the blocker body has a water outlet on its side wall. The water injection volume adjustment mechanism is used to adjust the flow rate of liquid entering the plunger body. When the liquid pressure entering the plunger body through the water injection regulating mechanism exceeds the predetermined pressure, it will push the plunger body to move, partially blocking the outlet, so that the liquid flow rate of the outlet is the predetermined flow rate; when the liquid pressure is less than the predetermined pressure, the elastic element will push the plunger body to move through elastic release, reducing the area of ​​the outlet blocked, so that the liquid flow rate is the predetermined flow rate.

[0005] Preferably, the plunger body is a cylinder; the upper part of the plunger body is T-shaped, the top surface of the T-shape is circular, and a pressure transmission hole is provided on the top surface of the T-shape.

[0006] Preferably, it further includes: a limiting pin; The outer wall of the T-shaped portion of the plunger body has an axially arranged limiting groove, and the side wall of the plug body has a pin hole, through which the limiting pin passes and is inserted into the limiting groove.

[0007] Preferably, the water injection volume adjustment mechanism includes: an upper fixed water nozzle, a lower fixed water nozzle, and an adjustment rod; The upper fixed water nozzle is located above the lower fixed water nozzle. The upper fixed water nozzle is connected to the bottom end of the adjusting rod, and the top end of the adjusting rod is connected to the retrieval rod. The upper and lower fixed water nozzles are provided with liquid outlet holes; The adjusting rod is used to drive the upper fixed water nozzle to rotate, and adjust the overlap area of ​​the liquid outlet holes of the upper fixed water nozzle and the lower fixed water nozzle.

[0008] Preferably, when the predetermined flow rate value changes, the upper fixed water nozzle is rotated by the adjusting rod to adjust the overlapping area of ​​the liquid outlet holes of the upper fixed water nozzle and the lower fixed water nozzle, thereby adjusting the predetermined flow rate. The size of the overlapping area corresponding to the predetermined flow rate is determined through numerical simulation. The numerical simulation involves inputting relevant parameters into numerical simulation software to simulate the flow rate of liquid entering the plunger body through the outlet hole under a predetermined injection pressure and at different overlapping areas. This flow rate is the predetermined flow rate.

[0009] Preferably, the adjusting rod can drive the upper fixed water nozzle to rotate 360° clockwise or counterclockwise, achieving stepless adjustment.

[0010] Preferably, the range of the predetermined flow rate is 0~100m. 3 / d.

[0011] Preferably, there are several outlet holes, which are evenly distributed on the upper fixed water nozzle and the lower fixed water nozzle respectively; The liquid outlet is fan-shaped.

[0012] Preferably, the upper fixed water nozzle is provided with a square through hole, the bottom end of the adjusting rod passes through the square through hole, and the outer shape of the bottom end of the adjusting rod matches the shape of the square through hole.

[0013] Preferably, the lower-level fixed water nozzle is provided with a circular second through hole, and the bottom end of the adjusting rod is inserted into the circular second through hole.

[0014] Preferably, the top end of the adjusting rod is connected to the salvage rod, and a limiting cap is fitted on the outside of the salvage rod. The limiting cap is used to drive the salvage rod, the adjusting rod, and the upper fixed water nozzle to rotate by cooperating with the high-efficiency measuring and adjusting instrument.

[0015] Preferably, the blocker body comprises: an upper body and a lower body; The plunger body and the water injection volume adjustment mechanism are located inside the lower body; The bottom of the lower body is connected to a filter screen, the top of the lower body is connected to the upper body, and the retrieval rod is located inside the upper body.

[0016] Preferably, the bottom end of the retrieval rod has a insertion groove, which is a rounded rectangle with two opposite sides being arc-shaped. The top end of the adjusting rod is inserted into the insertion groove, and the shape of the top end of the adjusting rod matches the shape inside the insertion groove.

[0017] Preferably, the elastic element is a plunger spring.

[0018] Preferably, the stiffness of the plunger spring is determined by numerical simulation; The numerical simulation involves inputting relevant parameters into numerical simulation software to simulate, under different liquid pressure conditions exceeding the predetermined pressure, the plunger body is pushed to move and block the outlet, so that the liquid flow rate at the outlet is maintained at the predetermined flow rate, requiring the required plunger spring stiffness.

[0019] Preferably, based on the plunger spring stiffness, the correspondence between the plunger spring pre-compression and the starting pressure difference is determined by numerical simulation; Based on the aforementioned correspondence, the initial position of the plunger body is determined.

[0020] The present invention has at least the following beneficial effects: This invention proposes a dual-fixed water nozzle type stepless adjustable constant flow plug. By designing a plunger body and elastic element that automatically adjusts the outlet flow rate according to the injected liquid pressure to maintain a constant flow, and setting a water injection volume adjustment mechanism to adjust the constant flow rate of the injection, the automatic constant flow rate adjustment of the outlet flow rate with changes in downhole pressure is realized. The flow rate adjustment method is simpler, thereby improving construction efficiency and reducing labor intensity. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the specification, serve to explain the technical solutions of the present invention.

[0022] Figure 1 A schematic diagram of the structure of a dual-fixed water nozzle type stepless adjustable constant current blocker according to an embodiment of the present invention is shown. Figure 2 A front view of the limiting cap according to an embodiment of the present invention is shown; Figure 3 A left view of the limiting cap according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of the pin structure according to an embodiment of the present invention is shown; Figure 5 A front view of a salvage rod according to an embodiment of the present invention is shown; Figure 6 A right view of a salvage rod according to an embodiment of the present invention is shown; Figure 7 A front view of the adjusting rod according to an embodiment of the present invention is shown; Figure 8 A left view of the adjusting rod according to an embodiment of the present invention is shown; Figure 9 A right view of the adjusting rod according to an embodiment of the present invention is shown; Figure 10 A front view of the plunger body according to an embodiment of the present invention is shown; Figure 11 A left view of the plunger body according to an embodiment of the present invention is shown; Figure 12 A front view of the upper fixed water tap according to an embodiment of the present invention is shown; Figure 13 A left view of the upper fixed water tap according to an embodiment of the present invention is shown; Figure 14 A front view of a lower-level fixed water tap according to an embodiment of the present invention is shown; Figure 15 A right view of a lower-level fixed water tap according to an embodiment of the present invention is shown.

[0023] In the diagram, 1-retrieval rod, 2-limit cap, 3-pin, 4-pressure cap, 5-compression spring, 6-upper body, 7-positioning pin, 8-cam, 9-adjusting rod, 10-plunger spring, 11-limit pin, 12-plunger body, 13-upper fixed nozzle, 14-lower fixed nozzle, 15-lower body, 16-filter screen, 17-O-ring packing, 18-pin groove, 19-insertion groove, 20-outlet, 21-first through hole, 22-pressure transmission hole, 23-limit groove, 24-square through hole, 25-liquid outlet, 26-second through hole. Detailed Implementation

[0024] Various exemplary embodiments, features, and aspects of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0025] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0026] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0027] Furthermore, to better illustrate the present invention, numerous specific details are set forth in the following detailed embodiments. Those skilled in the art will understand that the present invention can be practiced without certain specific details. In some instances, methods, means, elements, and circuits well known to those skilled in the art have not been described in detail in order to highlight the spirit of the invention.

[0028] Figure 1 A schematic diagram of the structure of a dual-fixed water nozzle type stepless adjustable constant current blocker according to an embodiment of the present invention is shown. Figure 2 A front view of the limiting cap according to an embodiment of the present invention is shown; Figure 3 A left view of the limiting cap according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of the pin structure according to an embodiment of the present invention is shown; Figure 5 A front view of a salvage rod according to an embodiment of the present invention is shown; Figure 6 A right view of a salvage rod according to an embodiment of the present invention is shown; Figure 7 A front view of the adjusting rod according to an embodiment of the present invention is shown; Figure 8 A left view of the adjusting rod according to an embodiment of the present invention is shown; Figure 9 A right view of the adjusting rod according to an embodiment of the present invention is shown; Figure 10 A front view of the plunger body according to an embodiment of the present invention is shown; Figure 11 A left view of the plunger body according to an embodiment of the present invention is shown; Figure 12 A front view of the upper fixed water tap according to an embodiment of the present invention is shown; Figure 13 A left view of the upper fixed water tap according to an embodiment of the present invention is shown; Figure 14 A front view of a lower-level fixed water tap according to an embodiment of the present invention is shown; Figure 15 A right view of a lower-level fixed water tap according to an embodiment of the present invention is shown. Figure 1-15As shown, a dual-fixed-nozzle type stepless adjustable constant flow plug includes: a plunger body 12 and a water injection adjustment mechanism; the plunger body 12 and the water injection adjustment mechanism are disposed inside the plug body, and an elastic element is disposed between the top of the plunger body 12 and the top of the plug body; the water injection adjustment mechanism is disposed below the plunger body 12, and a water outlet 20 is disposed on the side wall of the plug body; the water injection adjustment mechanism is used to adjust the liquid flow rate entering the plunger body 12; when the liquid pressure entering the plunger body 12 through the water injection adjustment mechanism exceeds a predetermined pressure, it will push the plunger body 12 to move, partially blocking the water outlet 20, so that the liquid flow rate of the water outlet 20 is the predetermined flow rate; when the liquid pressure is less than the predetermined pressure, the elastic element will release elastically to push the plunger body 12 to move, reducing the blocking area of ​​the water outlet 20, so that the liquid flow rate is the predetermined flow rate.

[0029] In embodiments of the present invention, such as Figure 1 As shown, during constant flow injection, the injection fluid enters through the bottom inlet of the plug, flows through the water injection volume adjustment mechanism, enters the interior of the plunger body 12, passes through the hollow flow channel inside the plunger body 12, and flows out from the outlet 20 on the side wall of the plug.

[0030] The flow rate of liquid entering the plunger body 12 is adjusted to a predetermined flow rate, such as 30 m³ / d, by the water injection regulating mechanism. If the downhole pressure remains unchanged and the liquid pressure entering the plunger body 12 is below the predetermined pressure, the plunger body 12 is located at the bottom of the plug body under the action of the elastic element and gravity, and at this time the plunger body 12 does not block the outlet 20.

[0031] During injection, the liquid enters from the bottom of the plug, flows through the injection volume regulating mechanism and the hollow interior of the plunger body 12, then flows out from the opening on the side wall of the plunger body 12, enters the hollow interior of the plug body, and finally flows out from the outlet 20 on the side wall of the plug body. At this time, the outlet 20 is opened to its maximum extent, and the flow area is at its maximum. Under constant injection flow rate, the outlet 20 always maintains an output volume of 30 m³ / d.

[0032] When the downhole pressure increases, the pressure of the fluid entering the plug body also increases. When the pressure exceeds a predetermined level, the fluid enters the plunger body 12 through the injection flow regulating mechanism. Upon reaching the top of the plunger body 12, the fluid pushes the plunger body 12 upward, compressing the elastic element. As the plunger body 12 moves upward, the sidewall below its opening moves upward, blocking the outlet 20, thereby reducing the flow area of ​​the outlet 20. Under the condition of increased fluid pressure but reduced flow area of ​​the outlet 20, the flow rate of the fluid flowing out of the outlet 20 can be maintained at a predetermined flow rate, i.e., 30 m³ / d.

[0033] When the downhole pressure decreases, the pressure of the fluid entering the plug body also decreases. The thrust exerted by the fluid on the top of the plunger body 12 decreases. Under the action of the elastic element, the plunger body 12 is pushed towards the bottom of the plug body through elastic release. As its sidewall moves downwards, it gradually moves away from the outlet 20, thereby increasing the flow area of ​​the outlet 20. With the fluid pressure decreasing but the flow area of ​​the outlet 20 increasing, the flow rate of the fluid exiting the outlet 20 can be maintained at a predetermined flow rate, i.e., 30 m³ / d.

[0034] As the downhole pressure changes, the blocker moves up and down, automatically adjusting the liquid flow at the 20 outlets to stabilize it at the predetermined flow rate, thus achieving constant flow injection.

[0035] In this invention, the plunger body 12 is a cylinder; the upper part of the plunger body 12 is T-shaped, the top surface of the T-shape is circular, and a pressure transmission hole 22 is provided on the top surface of the T-shape.

[0036] In embodiments of the present invention, such as Figure 10 and 11 As shown, the plunger body 12 is hollow inside, with an opening at the bottom and a frustum at the top. The frustum is connected to the plunger body 12 below it, forming a T-shaped structure.

[0037] When the downhole pressure increases, the fluid, after passing through the injection volume regulating mechanism, reaches the bottom of the plunger body 12 and enters its hollow interior through the bottom opening. It then rises to below the T-shaped bottom surface of the plunger body 12, pushing it upwards and compressing the elastic element above the T-shape. The side wall below the T-shape of the plunger body 12 moves upwards, blocking the outlet 20, thereby reducing the flow area of ​​the outlet 20.

[0038] When the downhole pressure decreases, the thrust exerted by the liquid on the T-shaped bottom surface inside the plunger body 12 decreases. Under the action of the elastic element, the plunger body 12 is pushed downward away from the outlet 20 through elastic release, thereby increasing the flow area of ​​the outlet 20.

[0039] A pressure-transmitting hole 22 is provided on the T-shaped pedestal. The pressure-transmitting hole 22 is used to balance the pressure between the inside of the plug body above the plunger body 12 and the inside of the plunger body 12, preventing the formation of a sealed space inside the plug body above the plunger body 12 that would prevent the plunger body 12 from moving up and down. There are two pressure-transmitting holes 22.

[0040] In this invention, it also includes: a limiting pin 11; the outer wall of the T-shaped portion of the plunger body 12 has an axially arranged limiting groove 23, and the side wall of the plug body is provided with a pin hole, and the limiting pin 11 passes through the pin hole and is inserted into the limiting groove 23.

[0041] In this embodiment of the invention, limiting grooves 23 are respectively provided on both sides of the T-shaped portion of the plunger body 12, and pin holes are designed on the blocker body at positions corresponding to the limiting grooves 23. The limiting pins 11 are inserted into the limiting grooves 23 through the pin holes.

[0042] When the plunger body 12 slides up and down inside the plug body, the limiting groove 23 and the limiting pin 11 work together to ensure that the plunger body 12 can only slide axially back and forth and cannot rotate.

[0043] Several sealing rings are also provided on the outer wall of the plunger body 12. The sealing rings are used to seal the space between the outer wall of the plunger body 12 and the inner wall of the plug body to prevent liquid from reaching the outlet 20 from between the plunger body 12 and the inner wall of the plug body.

[0044] In this invention, the water injection volume adjustment mechanism includes: an upper fixed water nozzle 13, a lower fixed water nozzle 14, and an adjusting rod 9; the upper fixed water nozzle 13 is located above the lower fixed water nozzle 14, the upper fixed water nozzle 13 is connected to the bottom end of the adjusting rod 9, and the top end of the adjusting rod 9 is connected to the retrieval rod 1; the upper fixed water nozzle 13 and the lower fixed water nozzle 14 are provided with liquid outlet holes 25; the adjusting rod 9 is used to drive the upper fixed water nozzle 13 to rotate and adjust the overlap area of ​​the liquid outlet holes 25 of the upper fixed water nozzle 13 and the lower fixed water nozzle 14.

[0045] In this invention, the top end of the adjusting rod 9 is connected to the salvage rod 1, and the salvage rod 1 is fitted with a limiting cap 2. The limiting cap 2 is used to drive the salvage rod 1, the adjusting rod 9 and the upper fixed water nozzle 13 to rotate by cooperating with the high-efficiency measuring and adjusting instrument.

[0046] In this embodiment of the invention, the lower-level fixed water nozzle 14 is disposed at the bottom of the plunger body 12 and is threadedly connected to the plunger body 12; the upper-level fixed water nozzle 13 is located above the lower-level fixed water nozzle 14. The adjusting rod 9 is located inside the plug body, passes through the upper-level fixed water nozzle 13, and its bottom end is connected to the lower-level fixed water nozzle 14; the plunger body 12 has a first through hole 21 in the middle for the adjusting rod 9 to pass through, the adjusting rod 9 passes through the plunger body 12 and the elastic element, and its top end is connected to the bottom end of the retrieval rod 1. The elastic element is sleeved on the outside of the adjusting rod 9.

[0047] The blocker body is equipped with a cam 8, a compression spring 5 at the top, and a pressure cap 4 above the compression spring 5. The cam 8 is fixed to the blocker body by a locating pin 7 and engages with the retrieval rod 1. The pressure cap 4 is threadedly connected to the blocker body, and the compression spring 5 is fitted onto the retrieval rod 1 and fixed by the pressure cap 4.

[0048] When the retrieval instrument drops the blockage into the water distributor, the dropping head on the dropping arm engages with the blockage cap 4. During its downward movement, the cam 8, protruding from the main body of the blockage, automatically springs back when it encounters an obstacle. When it reaches the preset position in the water distributor, the cam 8, protruding from the main body of the blockage, will lock onto the limiting step in the water distributor. Pulling the retrieval instrument upward will disengage the dropping head on the dropping arm from the blockage, thus completing the dropping operation of the blockage into the water distributor. When the retrieval instrument removes the blockage from the water distributor, the retrieval head on the dropping arm engages with the limiting cap 2. Lifting the limiting cap 2 causes the retrieval rod 1 to move upward with the limiting cap 2. The cam 8 and the retrieval rod 1 will no longer be locked. When the cam 8 encounters an obstacle again, it can rotate downward, and the blockage can be retrieved from the water distribution. The function of the compression spring 5 is that after the blockage is retrieved, rotating the cam 8 allows the retrieval rod 1 to automatically reset under the action of the compression spring 5 and lock onto the cam 8 again.

[0049] The retrieval rod 1 passes through the cam 8, the compression spring 5, and the pressure cap 4, with its top end positioned outside the plunger body 12. (Example:) Figure 2 , 3 As shown in Figure 4, a limiting cap 2 is fitted onto the retrieval rod 1 located outside the plunger body 12; as Figure 5 and 6 As shown, a pin groove 18 is provided on the retrieval rod 1, and a limit cap 2 is fixed on the retrieval rod 1 by a pin 3 and a pin groove 18. The outer wall of the limit cap 2 is prismatic and is used to connect with the measuring and adjusting instrument.

[0050] In this invention, when the predetermined flow rate value changes, the upper fixed water nozzle 13 is rotated by the adjusting rod 9 to adjust the overlapping area of ​​the liquid outlet hole 25 of the upper fixed water nozzle 13 and the lower fixed water nozzle 14, thereby adjusting the predetermined flow rate. The overlapping area corresponding to the predetermined flow rate is determined through numerical simulation. The numerical simulation involves inputting relevant parameters into numerical simulation software to simulate the flow rate of liquid entering the plunger body through the liquid outlet hole 25 under predetermined injection pressure conditions and with different overlapping areas. This flow rate value is the predetermined flow rate.

[0051] In this embodiment of the invention, the function of the water injection adjustment mechanism is to adjust the flow rate of liquid entering the plunger body 12 by adjusting the overlapping area of ​​the liquid outlet holes 25 on the two-stage water nozzles, that is, to adjust the predetermined flow rate. For example, when the predetermined flow rate is 100m³ / min... 3 When the flow rate is / d, the outlet holes 25 on the upper fixed water nozzle 13 and the lower fixed water nozzle 14 completely overlap, resulting in the maximum flow rate entering the plunger body 12. Therefore, the flow rate of liquid flowing out from the outlet 20 is also 100m³. 3 / d. When the downhole pressure changes, the liquid pressure inside the plunger body 12 fluctuates, causing the plunger body 12 to move up and down, changing the area of ​​the outlet 20 to block the water outlet 20, thus ensuring that the liquid pressure at the outlet 20 remains constant at 100m. 3 / d.

[0052] When the scheduled flow rate needs to be adjusted to 30m 3 At / d, the downhole measuring and adjusting instrument's adjusting arm is connected to the pressure cap 4. Its adjusting head, through the rotating limit cap 2, drives the fishing rod 1 to rotate by a predetermined angle. The limit cap 2 drives the fishing rod 1 and the connected adjusting rod 9 to rotate, which in turn drives the upper-level fixed water nozzle 13 to rotate. While the adjusting rod 9 drives the upper-level fixed water nozzle 13 to rotate, the lower-level fixed water nozzle 14 remains stationary, thus changing the overlap area of ​​the liquid outlet holes 25 on the upper-level and lower-level fixed water nozzles 13 to a predetermined area, making the liquid flow rate through the liquid outlet holes 25 30m³. 3 / d, to achieve regulation of the liquid flow rate entering the plunger body 12.

[0053] During adjustment, the size of the overlapping area corresponding to the predetermined flow rate (i.e., the predetermined area) is needed to determine the predetermined angle of rotation required for the adjusting rod, thus achieving precise adjustment. The predetermined flow rate corresponding to different overlapping areas can be determined by using numerical simulation software to simulate water injection. By establishing a blockage model based on actual parameters, the changes in the predetermined flow rate under different overlapping areas are simulated, thereby obtaining the overlapping area (predetermined area) corresponding to different predetermined flow rates, and subsequently, the required rotation angle (predetermined angle) for adjustment. For example, the simulation shows that when the overlapping area is 17.64 mm... 2 At that time, the corresponding constant flow rate is 30m³. 3 / d, so the planned flow rate during actual injection is 30m. 3 / d, requires rotating the adjusting rod to achieve an overlap area of ​​17.64mm. 2 .

[0054] In this invention, the adjusting rod 9 can drive the upper fixed water nozzle 13 to rotate 360° forward or reverse, thereby achieving stepless adjustment.

[0055] In this embodiment of the invention, the dual-stage fixed water nozzle design does not have a maximum displacement limit for the adjusting rod 9, and can rotate 360°, thereby achieving stepless adjustment and preventing the adjusting rod 9 from breaking due to being adjusted to its maximum displacement and then continuing to adjust.

[0056] In this invention, the range of the predetermined flow rate is: 0~100m 3 / d.

[0057] In this embodiment of the invention, by designing a two-stage water nozzle, the maximum constant flow range, i.e., the predetermined flow range, is increased from the original 0~70m³.3 / d expanded to 0~100m 3 / d enables an upgrade in injection volume. In actual on-site construction, it is generally not permissible to completely shut off zero-flow injection; therefore, the predetermined flow rate range varies from 10 to 100 m³ / d. 3 / d.

[0058] In this invention, there are several outlet holes 25, which are evenly distributed on the upper fixed water nozzle 13 and the lower fixed water nozzle 14; the outlet holes 25 are fan-shaped.

[0059] In embodiments of the present invention, such as Figure 12 and 13 As shown, two fan-shaped liquid outlet holes 25 of different sizes are designed on the upper fixed water nozzle 13 and the lower fixed water nozzle 14 respectively, so that the overlapping area of ​​the liquid outlet holes 25 changes more linearly and the flow rate adjustment accuracy is higher.

[0060] In this invention, the upper fixed water nozzle 13 is provided with a square through hole 24, the bottom end of the adjusting rod 9 passes through the square through hole 24, and the outer shape of the bottom end of the adjusting rod 9 matches the shape of the square through hole 24.

[0061] In this embodiment of the invention, the shape of the outer wall of the bottom end of the adjusting rod 9 matches the inner shape of the square through hole 24 of the upper fixed water nozzle 13. The bottom end of the adjusting rod 9 is inserted into the upper fixed water nozzle 13 through the square through hole 24, thereby driving the upper fixed water nozzle 13 to rotate.

[0062] In this invention, the lower fixed water nozzle 14 is provided with a circular second through hole 25, and the bottom end of the adjusting rod 9 is inserted into the circular second through hole 25.

[0063] In embodiments of the present invention, such as Figure 14 and 15 As shown, since the lower fixed water nozzle 14 does not need to rotate, a circular second through hole 25 is provided in the middle so that the adjusting rod 9 can pass through without affecting the rotation of the adjusting rod 9.

[0064] In this invention, the blocker body includes an upper body 6 and a lower body 15; the plunger body 12 and the water injection adjustment mechanism are located inside the lower body 15; the bottom end of the lower body 15 is connected to the filter screen 16, the top end of the lower body 15 is connected to the upper body 6, and the retrieval rod 1 is located inside the upper body 6.

[0065] In this embodiment of the invention, the lower body 15 and the upper body 6 are connected by threads; the plunger body 12, the elastic element, the upper fixed water nozzle 13, and the lower fixed water nozzle 14 are disposed inside the lower body 15, and the elastic element is located between the top of the lower body 15 and the top of the plunger body 12. The cam 8 and the lower part of the retrieval rod 1 are located inside the upper body 6, and the top of the upper body 6 is provided with a pressure cap 4.

[0066] The bottom of the lower body 15 is threadedly connected to a filter screen 16, which fixes the plunger body 12 in its initial position within the lower body 15. The filter screen 16 has several evenly spaced slits. Injected liquid enters the lower body 15 through these slits, preventing mud and sand larger than the slit size from entering the lower body 15 and clogging the space between the upper fixed water nozzle 13 and the lower fixed water nozzle 14, thus avoiding interference with the adjustment and water injection volume of the upper fixed water nozzle 13. The slit width is 1-2 mm, and the length is 15-20 mm. An O-ring packing 17 is installed on the outer wall of the filter screen 16 for sealing.

[0067] In this invention, the bottom end of the retrieval rod 1 has a insertion groove 19, which is a rounded rectangle with two opposite sides being arc-shaped. The top end of the adjusting rod 9 is inserted into the insertion groove 19, and the shape of the top end of the adjusting rod 9 matches the shape of the inside of the insertion groove 19.

[0068] In embodiments of the present invention, such as Figure 6 , 7 As shown in Figure 8, the lower end of the retrieval rod 1 and the upper end of the adjusting rod 9 are connected by a rounded rectangular insertion slot 19, and the upper fixed water nozzle 13 is connected to the lower end of the adjusting rod 9 by a square through hole 24, which facilitates disassembly and assembly.

[0069] After the measuring instrument is connected to the salvage rod 1, the rotation of the salvage rod 1 is adjusted, which in turn drives the adjusting rod 9 and the upper fixed water nozzle 13 to rotate in conjunction with the insertion slot 19.

[0070] In this invention, the elastic element is a plunger spring 10.

[0071] In this embodiment of the invention, when the injection pressure increases, the plunger body 12 moves upward to block the outlet 20; when the injection pressure decreases, the plunger body 12 slides downward to reset under the action of the plunger spring 10, moving away from the outlet 20. By changing the area of ​​the outlet 20 of the lower body 15, the pressure difference between the upper and lower fixed water nozzles remains constant, thereby maintaining a constant flow rate and achieving constant flow water injection.

[0072] In this invention, the stiffness of the plunger spring 10 is determined by numerical simulation; wherein, the numerical simulation is: inputting relevant parameters into numerical simulation software to simulate the required stiffness of the plunger spring 10 to push the plunger body 12 to move and block the outlet 20 under different liquid pressure conditions when the predetermined pressure is exceeded, so that the liquid flow rate at the outlet 20 is maintained at the predetermined flow rate.

[0073] In this embodiment of the invention, when the injection pressure increases above a predetermined pressure, the distance the plunger body 12 moves upward determines the area of ​​obstruction of the outlet 20, and thus the injection flow rate. Since the structural dimensions such as the area of ​​the outlet 20 and the internal volume of the lower body 15 are not easily changed, and the adjustment cost is high, the stiffness (rigidity) of the plunger spring 10 determines the distance the plunger body 12 is pushed upward when the predetermined pressure is exceeded. Only by selecting a spring with appropriate stiffness can the plunger body 12 move up and down a predetermined distance corresponding to a certain pressure, causing the outlet 20 to open to a predetermined liquid outlet area, thereby achieving constant flow water output.

[0074] The appropriate stiffness of the plunger spring 10 can be obtained by using numerical simulation software to simulate water injection. A blocker model can be established based on actual parameters. By using different plunger spring 10 stiffness parameters, the changes in water injection pressure exceeding a predetermined pressure can be simulated, thereby obtaining the corresponding vertical movement distance of the plunger body 12 and the flow rate at the outlet 20, and thus obtaining the required stiffness value of the plunger spring 10. The simulated spring stiffness result is 2.6-7 N / mm.

[0075] In this invention, based on the stiffness of the plunger spring 10, the correspondence between the pre-compression of the plunger spring 10 and the starting pressure difference is determined by numerical simulation; based on the correspondence, the initial position of the plunger body 12 is determined.

[0076] In this embodiment of the invention, the initial position of the plunger body 12 in different plugs when no water is injected, i.e., the pre-compression amount (initial pre-tightening force) of the plunger spring 10, determines the magnitude of the starting pressure difference. The higher the position of the plunger body 12, the greater the pre-compression amount of the plunger spring 10, and the lower the starting pressure difference. The lower the starting pressure difference, the easier it is to push the plunger body 12 to the predetermined position. Therefore, after determining the stiffness of the plunger spring 10, the correspondence between different pre-compression amounts of the plunger spring 10 and the starting pressure difference is simulated under this stiffness condition. Based on the set starting pressure difference used in the actual field, the pre-compression amount of the plunger spring 10 is determined, thereby determining the initial position of the plunger body 12, and this initial position should not affect the injection of the predetermined minimum water volume. Based on the initial position of the plunger body 12, the final upper length of the filter screen can be designed. For example, based on the simulation results, the final initial position of the plunger body 12 is determined to be between 1.5-2.5 mm of overlap height between the plunger body 12 and the outlet 20 of the lower body 15.

[0077] It is understood that the various embodiments mentioned above in this invention can be combined with each other to form combined embodiments without violating the principle and logic. Due to space limitations, this invention will not elaborate further.

[0078] The present invention relates to a dual-fixed-nozzle stepless adjustable constant flow plug. By designing a plug-in groove 19 at the lower end of the retrieval rod 1 and a square groove in the center of the upper-level fixed nozzle 13, the adjusting rod 9 can be plugged into the retrieval rod 1 and the upper-level fixed nozzle 13. This allows the adjusting rod 9 and the upper-level fixed nozzle 13 to rotate accordingly when the retrieval rod 1 is rotated, achieving stepless flow adjustment and preventing the adjusting rod 9 from breaking. Furthermore, by designing a limiting pin 11 at a corresponding position on the lower body 15 and a limiting groove 23 on the plunger body 12, the plunger body 12 can only slide in one direction and cannot rotate. The lower-level fixed nozzle 14 is threadedly connected to the plunger body 12. When the adjusting rod 9 drives the upper-level fixed nozzle 13 to rotate, the lower-level fixed nozzle 14 remains stationary. Therefore, by adjusting the rotation of the upper-level fixed nozzle 13, the overlap area of ​​the upper and lower fixed nozzles can be changed, thus adjusting the water injection volume. Without altering the constant flow principle, a dual fixed water nozzle adjustment mechanism is designed, and the overlapping area of ​​the dual fixed water nozzles is utilized to make the flow adjustment more linear, enhance the ability to pass impurities, reduce the difficulty of on-site adjustment and the probability of blockage, and improve the control accuracy, thereby significantly improving the process applicability and service life of the adjustable constant flow blocker.

[0079] Those skilled in the art will understand that, in the above-described method of the specific implementation, the order in which each step is written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0080] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A dual-fixed water nozzle type stepless adjustable constant flow blocker, characterized in that, include: The plunger body (12) and the water injection volume adjustment mechanism; The plunger body (12) and the water injection adjustment mechanism are located inside the blocker body, and an elastic element is provided between the top of the plunger body (12) and the top of the blocker body; The water injection volume adjustment mechanism is located below the plunger body (12), and the plug body has an outlet (20) on its side wall. The water injection volume adjustment mechanism is used to adjust the flow rate of liquid entering the plunger body (12). When the liquid pressure entering the plunger body (12) through the water injection adjustment mechanism exceeds the predetermined pressure, it will push the plunger body (12) to move, partially blocking the outlet (20), so that the liquid flow rate of the outlet (20) is the predetermined flow rate; when the liquid pressure is less than the predetermined pressure, the elastic element will push the plunger body (12) to move through elastic release, reducing the blocking area of ​​the outlet (20), so that the liquid flow rate is the predetermined flow rate.

2. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 1, characterized in that: The plunger body (12) is a cylinder; the upper part of the plunger body (12) is T-shaped, the top surface of the T-shape is circular, and a pressure transmission hole (22) is provided on the top surface of the T-shape.

3. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 2, characterized in that, Also includes: Limit pin (11); The outer wall of the T-shaped portion of the plunger body (12) has an axially arranged limiting groove (23), and the side wall of the plug body is provided with a pin hole. The limiting pin (11) passes through the pin hole and is inserted into the limiting groove (23).

4. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to any one of claims 1-3, characterized in that, The water injection volume adjustment mechanism includes: an upper fixed water nozzle (13), a lower fixed water nozzle (14), and an adjustment rod (9). The upper fixed water nozzle (13) is located above the lower fixed water nozzle (14). The upper fixed water nozzle (13) is connected to the bottom end of the adjusting rod (9), and the top end of the adjusting rod (9) is connected to the retrieval rod (1). The upper fixed water nozzle (13) and the lower fixed water nozzle (14) are provided with liquid outlet holes (25); The adjusting rod (9) is used to drive the upper fixed water nozzle (13) to rotate and adjust the overlapping area of ​​the liquid outlet hole (25) of the upper fixed water nozzle (13) and the lower fixed water nozzle (14).

5. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 4, characterized in that: When the predetermined flow rate value changes, the upper fixed water nozzle (13) is rotated by the adjusting rod (9) to adjust the size of the overlapping area of ​​the liquid outlet hole (25) of the upper fixed water nozzle (13) and the lower fixed water nozzle (14) and adjust the predetermined flow rate. The size of the overlapping area corresponding to the predetermined flow rate is determined through numerical simulation. The numerical simulation is as follows: inputting relevant parameters into the numerical simulation software to simulate the flow rate of liquid entering the plunger body through the liquid outlet (25) under a predetermined injection pressure and at different overlapping areas, where the flow rate is the predetermined flow rate.

6. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 5, characterized in that: The adjusting rod (9) can drive the upper fixed water nozzle (13) to rotate 360° forward or reverse, realizing stepless adjustment.

7. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 5, characterized in that: The range of the predetermined flow rate is: 0~100m 3 / d.

8. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 4, characterized in that: There are several outlet holes (25), which are evenly distributed on the upper fixed water nozzle (13) and the lower fixed water nozzle (14); The liquid outlet (25) is fan-shaped.

9. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 4, characterized in that: The upper fixed water nozzle (13) is provided with a square through hole (24), and the bottom end of the adjusting rod (9) passes through the square through hole (24). The outer shape of the bottom end of the adjusting rod (9) matches the shape of the square through hole (24).

10. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 4, characterized in that: The lower fixed water nozzle (14) is provided with a circular second through hole (25), and the bottom end of the adjusting rod (9) is inserted into the circular second through hole (25).

11. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 4, characterized in that: The top of the adjusting rod (9) is connected to the salvage rod (1), and the salvage rod (1) is fitted with a limiting cap (2). The limiting cap (2) is used to drive the salvage rod (1), the adjusting rod (9) and the upper fixed water nozzle (13) to rotate by cooperating with the high-efficiency measuring instrument.

12. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 11, characterized in that, The main body of the blocker includes: an upper body (6) and a lower body (15); The plunger body (12) and the water injection volume adjustment mechanism are located inside the lower body (15); The bottom end of the lower body (15) is connected to the filter screen (16), the top end of the lower body (15) is connected to the upper body (6), and the retrieval rod (1) is located inside the upper body (6).

13. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 4, characterized in that: The bottom end of the retrieval rod (1) has a plug groove (19), which is a rounded rectangle with two opposite sides being arc-shaped. The top end of the adjusting rod (9) is inserted into the plug groove (19), and the shape of the top end of the adjusting rod (9) matches the shape inside the plug groove (19).

14. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to any one of claims 1-13, characterized in that: The elastic element is a plunger spring (10).

15. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 14, characterized in that: The stiffness of the plunger spring (10) was determined by numerical simulation; The numerical simulation is as follows: inputting relevant parameters into the numerical simulation software to simulate the piston body (12) moving to block the outlet (20) under different liquid pressure conditions when the predetermined pressure is exceeded, so that the piston spring (10) stiffness required to keep the liquid flow rate at the outlet (20) at the predetermined flow rate.

16. The dual-fixed water nozzle type stepless adjustable constant flow blocker according to claim 15, characterized in that: Based on the stiffness of the plunger spring (10), the correspondence between the pre-compression of the plunger spring (10) and the starting pressure difference was determined by numerical simulation. Based on the correspondence, the initial position of the plunger body (12) is determined.

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