Multi-stage throttling water nozzle, constant-flow adjusting component comprising multi-stage throttling water nozzle and constant-flow blanking plug comprising multi-stage throttling water nozzle

Abstract

The invention discloses a multi-stage throttling water nozzle, a constant-flow adjusting component and a constant-flow blanking plug, and belongs to the technical field of oil field oil production engineering. The multi-stage throttling water nozzle comprises a plurality of baffles arranged at intervals in the first direction and a connecting piece connected with the baffles. A fluid channel is formed between every two adjacent baffles, each baffle is provided with a through hole penetrating in the first direction, the through holes in the adjacent baffles are in fluid communication with the fluid channels between the adjacent baffles, and the through holes in the adjacent baffles are arranged in a staggered mode. According to the multi-stage throttling water nozzle, the baffles are arranged, the through holes are formed in the adjacent baffles in a staggered mode, multi-stage baffle alternate throttling is achieved, and the multi-stage throttling water nozzle has the advantages that the overall structure is simple, installation and use are convenient, and small-flow adjustment is convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of oilfield production engineering, and specifically relates to a multi-stage throttling nozzle, a constant flow regulating component, and a constant flow plug Background Art

[0002] The water injection development technology in secondary oil recovery has become an important means in the middle and late stages of oilfield development. At present, due to large differences in formation parameters and serious interlayer interference between different formations in the same well in some domestic oilfields, a fine water injection technology has been developed. The fine water injection technology is an important means to improve the balanced utilization of oil layers, control water cut, and control decline. Increasing the number of fine divided layers can significantly increase the proportion of water absorption thickness, improve the degree of oil layer utilization and crude oil recovery rate, and thus increase the oilfield production. However, with the increase in the number of fine divided layers, after the water injection layers are finely divided, the number of small flow water injection layers with a flow rate of 3m 3 / d - 5m 3 / d and the test workload of injection wells have increased significantly. For small flow water injection with a flow rate of 3m 3 / d - 5m 3 / d, the equivalent nozzle diameter of the plug needs to be extremely small. The existing ordinary adjustable plugs are very difficult to adjust. Slight nozzle diameter adjustment or injection pressure fluctuation will cause the injected water volume to exceed the reasonable error range, and the decline in the water injection qualification rate and the shortening of the measurement and adjustment cycle will greatly increase the difficulty of measurement and adjustment work. The constant flow water injection technology can ensure that the flow rate is constantly injected in the application layer section under pressure fluctuation, but the existing ordinary constant flow plugs can only achieve constant flow water injection with a flow rate of 10m 3 / d - 100m 3 / d, and cannot meet the constant flow water injection demand for small flow rates of 3m 3 / d - 5m 3 / d Summary of the Invention

[0003] In order to solve at least one of the problems such as the large measurement and adjustment difficulty of ordinary adjustable plugs, the difficulty in ensuring the water injection qualification rate, and the inability to meet the small flow constant flow water injection demand, the present invention provides a multi-stage throttling nozzle, a constant flow regulating component, and a constant flow plug

[0004] To achieve the above technical objectives, the technical solutions adopted by the present invention are as follows

[0005] According to the first aspect of the present invention, a multi-stage throttling nozzle is provided, which includes

[0006] a plurality of baffles spaced apart from each other in a first direction; and

[0007] a connecting member connecting the plurality of baffles

[0008] Among them, a fluid channel is formed between adjacent baffles. Each baffle is provided with a through hole penetrating in the first direction. The through holes on adjacent baffles are in fluid communication with the fluid channel between the adjacent baffles, and the through holes on adjacent baffles are arranged staggeredly.

[0009] According to an embodiment of the present invention, the fluid channel formed between adjacent baffles is a space composed of a top wall, a bottom wall, and a side wall. Among them, the top wall and the bottom wall are each formed by two adjacent baffles, and the side wall is completely or partially formed by a connecting member, or the side wall is completely formed by a main body or a pipe used in cooperation with a multi-stage throttle nozzle.

[0010] According to an embodiment of the present invention, the multi-stage throttle nozzle is a three-stage throttle nozzle, including a first baffle, a second baffle, and a third baffle arranged in sequence along the first direction.

[0011] According to an embodiment of the present invention, multiple baffles are arranged parallel to each other.

[0012] According to an embodiment of the present invention, multiple baffles are in the shape of circular sheets and are arranged concentrically with each other.

[0013] According to an embodiment of the present invention, each baffle is provided with only one through hole.

[0014] According to an embodiment of the present invention, the included angle between the line connecting the center of the projection of the through hole on the first baffle on the second baffle and the center of the circle and the line connecting the through hole on the second baffle and the center of the circle is 30 degrees - 330 degrees, and / or the projection of the through hole on the first baffle on the third baffle coincides with the through hole on the third baffle.

[0015] According to an embodiment of the present invention, the first baffle and the second baffle have the same diameter, both of which are smaller than the diameter of the third baffle.

[0016] According to an embodiment of the present invention, the included angle between the line connecting the center of the projection of the through hole on the first baffle on the second baffle and the center of the circle and the line connecting the through hole on the second baffle and the center of the circle is 180 degrees, the projection of the through hole on the first baffle on the third baffle coincides with the through hole on the third baffle, and the diameters of the through holes on all baffles are 1.8 mm - 2.0 mm.

[0017] According to a second aspect of the present invention, a constant flow regulating component is provided, which includes the multi-stage throttle nozzle according to the first aspect of the present invention.

[0018] According to an embodiment of the present invention, the constant flow regulating component includes:

[0019] An outer housing, the outer housing having an inner cavity and a first fluid outlet;

[0020] The plunger body is axially slidably disposed in the inner cavity of the outer housing. A fluid chamber is formed inside the plunger body. The fluid chamber has a fluid inlet and a second fluid outlet. The second fluid outlet cooperates with the first fluid outlet of the outer housing to form a variable throttle orifice, which can adjust the fluid flow rate as the fluid pressure changes;

[0021] An elastic component is disposed in the inner cavity of the outer housing, between a part of the outer housing and the plunger body, for elastically supporting the plunger body.

[0022] Among them, a multi-stage throttle nozzle is disposed at the fluid inlet of the plunger body.

[0023] According to an embodiment of the present invention, the constant flow regulating component further includes a plunger cap connected to the plunger body. The multi-stage throttle nozzle can be fixed at the fluid inlet of the plunger body through the plunger cap.

[0024] According to an embodiment of the present invention, the elastic component includes a spring and a support member. One end of the spring is fixed on a part of the outer housing, and the other end is fixed on the support member. The support member abuts against the plunger body.

[0025] According to a third aspect of the present invention, a constant flow plug is provided, which includes the multi-stage throttle nozzle according to the first aspect of the present invention.

[0026] According to an embodiment of the present invention, the constant flow plug includes:

[0027] A main body, in which an upper cavity, a cam cavity, and a lower cavity are sequentially provided from top to bottom. A first fluid outlet is formed on the side wall of the lower cavity;

[0028] A compression cap is connected to the upper end of the main body;

[0029] A fishing rod passes through the compression cap and is disposed in the upper cavity;

[0030] A cam is rotatably installed in the cam cavity and is connected to the fishing rod;

[0031] A plunger body is axially slidably disposed in the lower cavity. A fluid chamber is formed inside the plunger body. The fluid chamber has a fluid inlet at one end of the plunger body and a second fluid outlet on the side wall of the plunger body. The second fluid outlet cooperates with the first fluid outlet to form a variable throttle orifice, which can adjust the fluid flow rate as the fluid pressure changes;

[0032] An elastic component is disposed in the lower cavity, between a part of the main body and the plunger body, for elastically supporting the plunger body;

[0033] A screen plug is connected to the lower end of the main body.

[0034] Among them, the multi-stage throttling nozzle is arranged at the fluid inlet of the plunger body.

[0035] According to an embodiment of the present invention, the constant flow choke also includes: a compression spring, which is sleeved on the fishing rod and fixed by a compression cap.

[0036] According to an embodiment of the present invention, the elastic component includes a plunger spring and a centralizer rod. The plunger spring is sleeved on the centralizer rod and fixed between a part of the centralizer rod and a part of the main body.

[0037] Due to the adoption of the above technical solution, the present invention can achieve the following technical effects:

[0038] The multi-stage throttling nozzle provided by the present invention realizes the alternate throttling of multiple-level baffles and gradually reduces the pressure by setting multiple baffles and staggering the through holes on adjacent baffles, reducing the pressure difference and fluid velocity on both sides of the nozzle. It has the advantages of simple overall structure, convenient installation and use, and easy small-flow adjustment. In particular, in some embodiments, by controlling the through-hole size to be 1.8 mm - 2.0 mm, small-flow adjustment of 3 m 3 / d - 5 m 3 / d can be achieved.

[0039] The constant flow regulating component provided by the present invention can achieve small-flow constant flow regulation due to the setting of the above multi-stage throttling nozzle.

[0040] The constant flow choke provided by the present invention, due to the setting of the above multi-stage throttling nozzle, can realize small-flow water injection in the way of alternate throttling of different-level baffles of the multi-stage throttling nozzle without affecting the injection pressure. In particular, in some embodiments, through the specific parameter design of the multi-stage throttling nozzle and the cooperation with the main body structure of the constant flow choke, small-flow constant flow water injection of 3 m 3 / d - 5 m 3 / d can be achieved. At the same time, by reducing the overlapping area of different-level baffles, the nozzle diameter of each-level baffle of the multi-stage throttling nozzle is increased, reducing the risk of blockage. The constant flow choke provided by the present invention can maintain the long-term stability of the water injection volume, extend the measurement and adjustment period, reduce the difficulty of measurement and adjustment work, and reduce the test workload. Description of the Drawings

[0041] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0042] Figure 1 is a schematic perspective view of a multi-stage throttling nozzle provided by an embodiment of the present invention;

[0043] Figure 2 is Figure 1A schematic cross-sectional view of a multi-stage throttling nozzle is shown;

[0044] Figure 3 A schematic diagram of a constant current regulating component provided by an embodiment of the present invention;

[0045] Figure 4 A schematic diagram of a constant flow plug provided in one embodiment of the present invention.

[0046] Reference numerals list

[0047] 1- baffle, 11- first baffle, 12- second baffle, 13- third baffle, 2- connector, 3- fluid channel, 31- first fluid channel, 32- first fluid channel, 4- through hole

[0048] 10-outer shell, 101-first fluid outlet, 20-plunger body, 201-fluid chamber, 202-second fluid outlet, 30-multi-stage throttling nozzle, 40-elastic component

[0049] 100-main body, 1001-upper cavity, 1002-cam cavity, 1003-lower cavity, 1004-upper body, 1005-lower body, 200-pressure cap, 300-fishing rod, 400-cam, 500-elastic component, 5001-plunger spring, 5002-righting rod, 600-plunger body, 6001-fluid chamber, 6002-second fluid outlet, 700-multi-stage throttling nozzle, 800-plunger cap, 900-screen plugging, 1000-compression spring, 1100-O-type packing DETAILED DESCRIPTION

[0050] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0051] In addition, reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] Those skilled in the art can understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless specifically defined as in the embodiments of this application.

[0053] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as a limitation to the present invention.

[0054] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, terms such as "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] According to a first aspect of the present invention, a multi-stage throttle faucet is provided. The multi-stage throttle faucet can be used in cooperation with a main body or a pipeline to be throttled. Specifically, it is arranged on the fluid flow path of the main body or pipeline to be throttled. As Figure 1 and Figure 2 shown, the multi-stage throttle faucet includes a plurality of baffles 1 spaced apart from each other in a first direction A and a connecting member 2 connecting the plurality of baffles 1. A fluid channel 3 is formed between adjacent baffles 1. Through holes 4 penetrating in the first direction A are provided on each baffle 1. The through holes 4 on adjacent baffles 1 are in fluid communication with the fluid channel 3 between adjacent baffles 1, and the through holes 4 on adjacent baffles 1 are arranged staggeredly.

[0057] As used herein, "spaced apart from each other" means that there is a certain distance between adjacent baffles 1 so as to form a fluid passage for short-term retention of fluid therebetween. As used herein, "the through holes 4 on adjacent baffles 1 are staggered" means that the through hole 4 of one baffle 1 is not directly opposite to the through hole 4 of another baffle 1, that is, the through hole 4 of one baffle 1 is not directly above or below the through hole 4 of another baffle 1 along the first direction A.

[0058] The fluid passage 3 formed between adjacent baffles 1 is a space composed of a top wall, a bottom wall and side walls. Among them, the top wall and the bottom wall are each formed by two adjacent baffles 1. In some embodiments, the side walls can be completely formed by the connecting member 2 (not shown). In this case, the connecting member 2 can be the cylindrical side wall of the entire multi-stage throttling nozzle. In the illustrated embodiment, the side walls are only partially formed by the connecting member 2, and the remaining part of the side walls can be formed by the main body or pipeline used in cooperation with the multi-stage throttling nozzle. That is to say, the baffle 1, the main body or pipeline, and the connecting member 2 cooperate to form the fluid passage 3. In some embodiments, the side walls can also be completely formed by the main body or pipeline used in cooperation with the multi-stage throttling nozzle, rather than being formed by the connecting member 2. In this case, the connecting member 2 only serves to connect multiple baffles.

[0059] In the illustrated embodiment, the multi-stage throttling nozzle is a three-stage throttling nozzle, including three baffles 1 arranged in sequence along the first direction A, namely the first baffle 11, the second baffle 12 and the third baffle 13. A first fluid passage 31 is formed between the first baffle 11 and the second baffle 12, a second fluid passage 32 is formed between the second baffle 12 and the third baffle 13, the through hole 4 on the third baffle 13 forms a fluid inlet for the fluid to enter the multi-stage throttling nozzle, and the through hole on the first baffle 11 forms a fluid outlet for the fluid to leave the multi-stage throttling nozzle. During use, the fluid can enter the second fluid passage 32 through the fluid inlet, then enter the first fluid passage 31 through the through hole 4 on the second baffle 12, and finally flow out through the fluid outlet. During the flow of the fluid, due to the local resistance of the baffle 1, the pressure of the fluid decreases and energy is lost. In other embodiments, the multi-stage throttling nozzle can be a higher or lower stage throttling nozzle, including more or fewer baffles 1, such as a two-stage throttling nozzle or a four-stage throttling nozzle.

[0060] In the illustrated embodiment, the multiple baffles 1 are arranged parallel to each other. In other embodiments, the multiple baffles 1 can also be arranged at a certain angle to each other.

[0061] In the illustrated embodiment, the multiple baffles 1 are in the shape of circular plates and are arranged concentrically with each other. In other embodiments, the multiple baffles 1 can be arranged in different shapes according to needs.

[0062] In the illustrated embodiment, the first baffle 11 and the second baffle 12 have the same diameter, but are different from the diameter of the third baffle 13, and the diameter of the third baffle 13 is greater than the diameters of the first baffle 11 and the second baffle 12, so as to facilitate the sealed installation of the multi-stage throttle nozzle.

[0063] In the illustrated embodiment, only one through hole 4 is provided on each baffle 1. In other embodiments, different numbers of through holes 4 can be provided on each baffle 1 according to the throttling requirements.

[0064] In some embodiments, the included angle between the line connecting the center of the projection of the through hole 4 on the first baffle 11 on the second baffle 12 and the center of the second baffle 12 and the line connecting the through hole 4 on the second baffle 12 and the center of the second baffle 12 is 30 degrees - 330 degrees, preferably 90 degrees - 270 degrees, more preferably 180 degrees, and the projection of the through hole 4 on the first baffle 11 on the third baffle 13 coincides with or is spaced apart by a certain angle from the through hole 4 on the third baffle 13.

[0065] In the illustrated embodiment, the included angle between the line connecting the center of the projection of the through hole 4 on the first baffle 11 on the second baffle 12 and the center of the second baffle 12 and the line connecting the through hole 4 on the second baffle 12 and the center of the second baffle 12 is 180 degrees, and the projection of the through hole on the first baffle 11 on the third baffle 13 coincides with the through hole 4 on the third baffle 13.

[0066] In a specific example, the parameters of the multi-stage throttle nozzle are as follows: the diameter of the through hole 4 on the three baffles 11 is 2.0 mm, the thickness of the three baffles is 2.5 mm, the distance between adjacent baffles 1 is 6 mm, the diameters of the first baffle 11 and the second baffle 12 are 10 mm, and the diameter of the third baffle 13 is 12 mm. Through this parameter design, the multi-stage throttle nozzle can achieve 5m 3 / d small flow control. In another specific example, the parameters of the multi-stage throttle nozzle are as follows: the diameter of the through hole 4 on the three baffles 11 is 1.8 mm, the thickness of the three baffles is 2.5 mm, the distance between adjacent baffles 1 is 6 mm, the diameters of the first baffle 11 and the second baffle 12 are 10 mm, and the diameter of the third baffle 13 is 12 mm. Through this parameter design, the multi-stage throttle nozzle can achieve 3m 3 / d small flow control.

[0067] The multi-stage throttle nozzle provided according to the first aspect of the present invention can be provided as a one-piece component on the fluid flow path of the main body or the pipeline to achieve the functions of pressure reduction and flow restriction. Its overall structure is simple, easy to install, and convenient for small flow regulation.

[0068] According to the second aspect of the present invention, a constant flow regulating component is provided. As Figure 3As shown, the constant current regulating component includes: a housing 10 having an inner cavity and a first fluid outlet 101; a plunger body 20 axially slidably disposed in the inner cavity of the housing 10, a fluid chamber 201 is formed inside the plunger body 20, the fluid chamber 201 has a fluid inlet and a second fluid outlet 202, and the second fluid outlet 202 cooperates with the first fluid outlet 101 to form a variable throttle orifice, which can adjust the fluid flow rate as the fluid pressure changes; a multi-stage throttle nozzle 30 disposed at the fluid inlet of the plunger body 20; an elastic component 40 disposed in the inner cavity of the housing 10, the elastic component 40 is located between a part of the housing 10 and the plunger body 20, and is used to elastically support the plunger body 20. Among them, the structure of the multi-stage throttle nozzle 30 refers to the multi-stage throttle nozzle described in the first aspect of the present invention, and will not be elaborated here.

[0069] The mention here that "the second fluid outlet 202 and the first fluid outlet 101 cooperate to form a variable throttle orifice" means that the first fluid outlet 101 and the second fluid outlet 202 are in fluid communication and the flow area between them can change with the change of the fluid pressure, so as to adjust the fluid flow rate with the change of the fluid pressure to achieve the purpose of constant current.

[0070] During the use of the constant current regulating component provided by the present invention, the fluid enters the fluid chamber 201 of the plunger body 20 through the multi-stage throttle nozzle 30, and then flows out through the second fluid outlet 202 of the plunger body 20 and the first fluid outlet 101 of the housing 10. In the ideal working state, the fluid pressure received by the plunger body 20 is balanced with the elastic force of the elastic component 40. When the fluid pressure changes, under the action of the elastic component 40, the plunger body 20 moves to automatically adjust the area of the variable throttle orifice with the change of the pressure, so as to keep the fluid flow rate unchanged. Specifically, when the fluid pressure increases and the fluid pressure is greater than the elastic force of the elastic component 40, the plunger body 20 moves to the left, and the area of the variable throttle orifice decreases, so that the flow rate decreases to a value close to the original value; when the fluid pressure decreases and the fluid pressure is less than the elastic force of the elastic component 40, the plunger body 20 moves to the right, and the area of the variable throttle orifice increases, so as to keep the flow rate basically unchanged.

[0071] The flow rate calculation formula of the variable throttle orifice is:

[0072]

[0073] ΔP = P 嘴前 - P 嘴后

[0074] Among them, Q is the fluid flow rate through the variable throttle orifice, A is the flow cross-sectional area of the nozzle, μ is the nozzle flow coefficient, P 嘴前 is the fluid injection pressure, P 嘴后$P$ is the internal pressure of the plunger body, and $\rho$ is the density of the fluid.

[0075] In the illustrated embodiment, the outer housing 10 is provided with one end open and one end closed, and a first fluid outlet 101 is formed on the side wall of the outer housing 10. However, the present invention is not limited thereto, and the position of the first fluid outlet 101 can be adjusted as needed, as long as it can cooperate with the second fluid outlet 202 to form a variable throttle orifice.

[0076] In the illustrated embodiment, the fluid chamber 201 has a fluid inlet at one end of the plunger body 20 and a second fluid outlet 202 on the side wall of the plunger body 20. However, the present invention is not limited thereto, and the positions of the fluid inlet and the second fluid outlet 202 can be adjusted as needed.

[0077] In some embodiments, the constant flow regulating component further includes a plunger cap 50 connected to the plunger body 20, and the multi-stage throttle nozzle 30 can be fixed at the open end of the outer housing 10 through the plunger cap 50.

[0078] In some embodiments, the elastic component 40 includes a spring and a support member. One end of the spring is fixed to the closed end of the outer housing 10, and the other end is fixed to the support member, and the support member abuts against the plunger body 20.

[0079] The constant flow regulating component provided according to the second aspect of the present invention can have the advantages described in the first aspect of the present invention due to the use of the multi-stage throttle nozzle described in the first aspect of the present invention.

[0080] According to a third aspect of the present invention, a constant flow plug is provided. As Figure 4 shown, the constant flow plug includes: a main body 100, a compression cap 200, a fishing rod 300, a cam 400, an elastic component 500, a plunger body 600, a multi-stage throttle nozzle 700, a plunger cap 800, and a screen plug 900.

[0081] Inside the main body 100, there are successively arranged an upper cavity 1001, a cam cavity 1002, and a lower cavity 1003 from top to bottom. The compression cap 200 is connected to the upper end of the main body 100. The fishing rod 300 passes through the compression cap 200 and is arranged in the upper cavity 1001. The cam 400 is rotatably installed in the cam cavity 1002 and is connected to the fishing rod 300. The elastic component 500, the plunger body 600, the multi-stage throttle nozzle 700, and the plunger cap 800 are successively arranged in the lower cavity 1003 from top to bottom. A first fluid outlet 10031 is formed on the side wall of the lower cavity 1003. The plunger body 600 is axially slidably arranged in the lower cavity 1003. A fluid chamber 6001 is formed inside the plunger body 600. The fluid chamber 6001 has a fluid inlet at one end of the plunger body 600 and a second fluid outlet 6002 on the side wall of the plunger body 600. The first fluid outlet 10031 and the second fluid outlet 6002 cooperate to form a variable throttle orifice, which can adjust the fluid flow rate as the fluid pressure changes. The multi-stage throttle nozzle 700 is arranged at the fluid inlet of the plunger body 600. The elastic component 500 is located between the component connected to the upper end of the lower cavity 1003 and the plunger body 600, and is used to elastically support the plunger body 600. The screen plug 900 is connected to the lower end of the main body 100. Among them, the structure of the multi-stage throttle nozzle 700 refers to the multi-stage throttle nozzle described in the first aspect of the present invention, and will not be elaborated here.

[0082] In the illustrated embodiment, the main body 100 is composed of two parts: an upper main body 1004 and a lower main body 1005. The upper main body 1004 is threadedly connected to the lower main body 1005. The upper cavity 1001 and the cam cavity 1002 are formed in the upper main body 1004, and the lower cavity 1003 is formed in the lower main body 1005. The compression cap 200 is threadedly connected to the upper main body 1004. The fishing rod 300 passes through the compression cap 200 and is inserted into the cam 400. The compression spring 1000 is sleeved on the fishing rod 300 and fixed by the compression cap 200. The cam 400 is hingedly fixed on the upper main body 1001 through a small shaft 4001.

[0083] In the illustrated embodiment, the elastic component 500 is composed of a plunger spring 5001 and a centralizing rod 5002. The plunger spring 5001 is sleeved on the centralizing rod 5002 and fixed between the lower main body 1005 and the plunger body 600. The plunger cap 800 is threadedly connected to the plunger body 600 and fixes the multi-stage throttle nozzle 700 in the plunger body 600. The screen plug 900 is threadedly connected to the lower main body 1005 and fixes the plunger body 600 in the designed initial position.

[0084] In the illustrated embodiment, an O-ring packing is also arranged on the outer surface of the screen plug 900, which plays a sealing role.

[0085] In the illustrated embodiment, the diameters of the upper two baffles of the multi-stage throttle nozzle 700 are the same, and the diameter of the lowermost baffle is greater than the diameters of the upper two baffles. The plunger body 600 includes an upper section and a lower section with different inner diameters. The inner diameter of the upper section is smaller than that of the lower section. The inner wall of the lower section is provided with internal threads for connection with the external threads of the plunger cap 800. The diameters of the upper two baffles of the multi-stage throttle nozzle 700 match the inner diameter of the upper section of the plunger body 600, so that in the installed state, a fluid passage is formed by the cooperation of the plunger body and the multi-stage throttle nozzle 700. The diameter of the lowermost baffle of the multi-stage throttle nozzle 700 matches the inner diameter of the plunger cap 800.

[0086] The working principle of the constant flow plug is as follows: When water is injected into the formation through the plug, it acts on both ends of the plunger body 600. Under the combined action of the plunger spring 5001, the plunger body 600 reciprocates with the change of the injection pressure difference, thereby changing the flow-through area between the plunger body 600 and the main body 100 and regulating the flow rate to keep it constant. Specifically, when the injection pressure increases, the plunger body 600 compresses the plunger spring 5001 and moves forward under the action of the injection pressure. The water outlet on the lower main body 1005 becomes smaller, and the throttling effect causes the internal pressure of the plunger body 600 to increase. When the difference between the injection pressure and the internal pressure of the plunger body 600 is the same as before the increase in the injection pressure, the plunger body 600 stops moving. Since the pressure difference before and after the nozzle of the multi-stage throttle nozzle 700 remains unchanged, the injection flow rate is constant. Similarly, when the injection pressure decreases, the plunger body 600 moves backward under the elastic force of the plunger spring 5001. The water outlet on the lower main body 600 becomes larger, and the internal pressure of the plunger body 600 decreases. When the difference between the injection pressure and the internal pressure of the plunger body 600 is the same as before the decrease in the injection pressure, the plunger body 600 stops moving, reaching the state of constant flow water injection.

[0087] Due to the use of a multi-stage throttle nozzle, the constant flow plug provided by the third aspect of the present invention can achieve constant flow water injection with a small flow rate by alternately throttling different levels of baffles without affecting the injection pressure. In particular, it can achieve constant flow water injection with a small flow rate of 3m 3 / d - 5m 3 / d by designing the specific parameters of the multi-stage throttle nozzle in cooperation with the main body structure of the constant flow plug. For example, when the through-hole diameter of the multi-stage throttle nozzle is 1.8 mm, constant flow water injection with a small flow rate of 3m 3 / d can be achieved. When the through-hole diameter of the multi-stage throttle nozzle is 2 mm, constant flow water injection with a small flow rate of 5m 3 / d Constant flow water injection with a small flow rate. At the same time, the nozzle diameter of each layer of the baffle of the multi-stage throttling nozzle can be increased by reducing the overlapping area of the baffles at different levels, reducing the risk of blockage. Thus, the constant flow plug provided by the present invention can maintain the long-term stability of the water injection volume, extend the measurement and adjustment cycle, reduce the difficulty of measurement and adjustment work, and reduce the test workload.

[0088] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0089] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, without conflict, they can be combined in any suitable manner. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0090] In addition, any combination can be made between various different embodiments of the present invention, as long as it does not violate the idea of the present invention, it should also be regarded as the content disclosed by the present invention.

Claims

1. A multi-stage throttling faucet, comprising: A plurality of baffles spaced apart from each other in a first direction; And A connecting member connecting the plurality of baffles, Wherein, a fluid passage is formed between adjacent baffles, and through holes penetrating in the first direction are provided on each baffle. The through holes on adjacent baffles are in fluid communication with the fluid passage between adjacent baffles, and the through holes on adjacent baffles are arranged staggeredly.

2. The multi-stage throttling faucet according to claim 1, wherein The fluid passage formed between adjacent baffles is a space composed of a top wall, a bottom wall and a side wall. Wherein, the top wall and the bottom wall are each formed by two adjacent baffles, and the side wall is completely or partially formed by the connecting member, or the side wall is completely formed by the main body or pipeline used in cooperation with the multi-stage throttling faucet.

3. The multi-stage throttling faucet according to claim 1, characterized in that The multi-stage throttling faucet is a three-stage throttling faucet, including a first baffle, a second baffle and a third baffle arranged in sequence along the first direction.

4. The multi-stage throttling faucet according to claim 1, characterized in that, The plurality of baffles are arranged parallel to each other.

5. The multi-stage throttling faucet according to claim 1, wherein The plurality of baffles are circular flakes and are arranged concentrically with each other.

6. The multi-stage throttling faucet according to claim 3, characterized in that, Only one through hole is provided on each baffle.

7. The multi-stage throttling faucet according to claim 6, characterized in that, The included angle between the line connecting the center of the projection of the through hole on the first baffle on the second baffle and the center of the circle and the line connecting the through hole on the second baffle and the center of the circle is 30 degrees - 330 degrees, and / or the projection of the through hole on the first baffle on the third baffle coincides with the through hole on the third baffle.

8. The multi-stage throttling faucet according to claim 7, characterized in that, The diameters of the first baffle and the second baffle are the same and are both smaller than the diameter of the third baffle.

9. The multi-stage throttling faucet according to claim 8, characterized in that, The included angle between the line connecting the center of the projection of the through hole on the first baffle on the second baffle and the center of the circle and the line connecting the through hole on the second baffle and the center of the circle is 180 degrees, the projection of the through hole on the first baffle on the third baffle coincides with the through hole on the third baffle, and the diameters of the through holes on all baffles are 1.8 mm - 2.0 mm.

10. A constant current regulating component, characterized in that, Including the multi-stage throttling faucet according to any one of claims 1-9.

11. The constant current regulating component according to claim 10, characterized in that, Including: An outer housing having an inner cavity and a first fluid outlet; A plunger body axially slidably disposed in the inner cavity of the outer housing. A fluid chamber is formed inside the plunger body. The fluid chamber has a fluid inlet and a second fluid outlet. The second fluid outlet cooperates with the first fluid outlet of the outer housing to form a variable throttling orifice, and can adjust the fluid flow rate as the fluid pressure changes; An elastic component disposed in the inner cavity of the outer housing, between a part of the outer housing and the plunger body, for elastically supporting the plunger body, Wherein, the multi-stage throttling faucet is disposed at the fluid inlet of the plunger body.

12. The constant current regulating component according to claim 11, characterized in that, The constant flow regulating component further includes a plunger cap connected to the plunger body. The multi-stage throttling faucet can be fixed at the fluid inlet of the plunger body through the plunger cap.

13. The constant current regulating component according to claim 11, wherein The elastic component includes a spring and a support member. One end of the spring is fixed on a part of the outer housing, and the other end is fixed on the support member. The support member abuts against the plunger body.

14. A constant current plugging device, characterized in that, Including the multi-stage throttling faucet according to any one of claims 1-9.

15. The constant current plugging device according to claim 14, characterized in that, Including: A main body, in which an upper cavity, a cam cavity and a lower cavity are sequentially provided from top to bottom. A first fluid outlet is formed on the side wall of the lower cavity; A compression cap connected to the upper end of the main body; A fishing rod passing through the compression cap and disposed in the upper cavity; A cam rotatably installed in the cam cavity and connected to the fishing rod; The plunger body is axially slidably arranged in the lower cavity. A fluid chamber is formed inside the plunger body. The fluid chamber has a fluid inlet at one end of the plunger body and a second fluid outlet on the side wall of the plunger body. The second fluid outlet cooperates with the first fluid outlet to form a variable throttle orifice, which can adjust the fluid flow rate as the fluid pressure changes; The elastic component is arranged in the lower cavity and is located between a part of the main body and the plunger body for elastically supporting the plunger body; The screen plug is connected to the lower end of the main body, wherein, the multi-stage throttle nozzle is arranged at the fluid inlet of the plunger body.

16. The constant current plugging device according to claim 15, wherein It further includes: A compression spring is sleeved on the fishing rod and fixed by a compression cap.

17. The constant current plugging device according to claim 15, characterized in that, The elastic component includes a plunger spring and a centralizer rod. The plunger spring is sleeved on the centralizer rod and is fixed between a part of the centralizer rod and a part of the main body.

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