Centralizers and oil well equipment

Abstract

The present invention discloses a centralizer and oil well equipment. The centralizer includes a main body and an injection valve. The main body is provided with a cavity and a drug inlet and a drug outlet connected to the cavity. The drug inlet and the drug outlet are arranged at intervals. One end of the injection valve close to the drug inlet is movably connected to the inner wall of the cavity. Before injecting drugs, the injection valve moves toward the drug inlet to close the drug outlet. When injecting drugs, the injection valve is pressed down toward the side away from the drug inlet to expose the drug outlet to connect the drug inlet and the drug outlet. The technical solution of the present invention combines the main body and the injection valve of the centralizer, breaking the limitation of the original drug adding device being tied to the outside of the pumping pipe or injecting the drug into the pumping pipe to mix with the oil or liquid. The drug outlet is opened on the main body, which can make the drug output large and uniform, and the drug and oil are fully mixed to avoid the oil being in a state of agglomeration or waxing during extraction, which is convenient for smooth oil extraction, and effectively solves the technical problem of the small amount of drug output and uneven distribution of the drug adding device in the well.

Description

Technical Field

[0001] The invention relates to the technical field of oil well exploitation, in particular to a centralizer and oil well equipment. Background Art

[0002] In the field of oil well mining technology, the chemical injection valve is suitable for injecting chemicals into oil and gas wells, such as fungicides, anti-scaling agents, anti-waxing and other chemical injections, including a ground injection pump, a chemical injection pipeline, and the lowest section of the chemical injection valve. In the related art, the injection pump is placed on the ground, and the chemical is transmitted into the oil well through a pipeline. The pipeline is tied to the casing of the oil well pumping device. The chemical injection valve is connected to the pumping pipe, and is mixed with the oil during the rising process of the pumping pipe as the oil is extracted. The ground injection pump pressurizes the chemical into the pumping pipe. Due to the limited space in the pumping casing, multiple pipelines cannot be used to go down the well at the same time, and the rising oil flow rate is high, so there is a problem of uneven mixing of the chemical with the oil in the pumping pipe. Summary of the invention

[0003] The main purpose of the present invention is to provide a centralizer and oil well equipment, aiming to solve the technical problem that the dosing device of the oil well equipment has a small amount of medicine discharged and uneven distribution downhole.

[0004] In order to achieve the above-mentioned purpose, the present invention proposes a centralizer, which is applied to an oil well dosing device, and the centralizer comprises:

[0005] A main body, wherein the main body is provided with a containing cavity and a drug inlet and a drug outlet communicating with the containing cavity, wherein the drug inlet and the drug outlet are spaced apart; and

[0006] An injection valve is movably disposed in the cavity and is used to open or close the medicine outlet.

[0007] Optionally, a plurality of the drug outlets are provided, and the plurality of drug outlets are spaced apart and ring-shaped on the main body.

[0008] Optionally, the centralizer further comprises a plurality of baffles, wherein the plurality of baffle spacer rings are arranged on the main body, each of the baffles is arranged parallel to the axial direction of the main body, and a drug outlet is arranged between two adjacent baffles.

[0009] Optionally, the centralizer further comprises an upper joint, wherein the upper joint is arranged at one end of the main body where the drug inlet is opened, and the drug outlet is arranged at one end of the main body away from the upper joint.

[0010] Optionally, an annular platform is protruding from the inner wall of the cavity, the annular platform divides the cavity into a liquid inlet cavity and a liquid outlet cavity, and a through hole connecting the liquid inlet cavity and the liquid outlet cavity is provided, the drug inlet is connected to the liquid inlet cavity, and the drug outlet is connected to the liquid outlet cavity;

[0011] The injection valve is arranged in the liquid outlet cavity and is slidably connected to the inner wall of the liquid outlet cavity. The injection valve movably abuts against the annular platform to cover the through hole.

[0012] Optionally, the injection valve comprises:

[0013] an elastic member, the elastic member being disposed in the liquid outlet cavity and having one end connected to an end of the main body away from the through hole; and

[0014] A valve seat is connected to the other end of the elastic member and is in sealing contact with the inner wall of the liquid outlet cavity. The elastic member drives the valve seat to be slidably connected with the inner wall of the liquid outlet cavity to cover the through hole.

[0015] Optionally, the injection valve further includes a float ball, the diameter of which is larger than the aperture of the through hole, and the float ball is movably disposed in the liquid outlet cavity;

[0016] The elastic member drives the valve seat to abut against the float, so that the float abuts against the annular platform to seal and connect the edge of the through hole.

[0017] Optionally, the injection valve further comprises a sealing member, which is sleeved on the valve seat and sealingly abuts against the inner wall of the liquid outlet cavity (30F).

[0018] Optionally, the centralizer further comprises:

[0019] A drug inlet connector, the drug inlet connector is arranged at the main body adjacent to the drug inlet, a through hole is provided in the middle of the drug inlet connector, and the through hole is connected to the drug inlet; and

[0020] A medicine inlet valve is arranged in the through hole, and the medicine inlet valve is a one-way valve.

[0021] The present invention also provides an oil well equipment, the oil well equipment comprising:

[0022] Casing, which is arranged in the oil well and forms a well completion passage;

[0023] A centralizer as described in any one of the above items, wherein the centralizer is movably disposed in the completion passage; and

[0024] An oil injection pump is arranged outside the well and is provided with a pipeline. A connecting piece is provided at one end of the pipeline facing the centralizer, and the connecting piece can be detachably connected to the drug inlet of the centralizer.

[0025] The technical solution of the present invention solves the technical problem that the dosing device of the oil well equipment has a small amount of medicine and uneven distribution in the well. The straightener includes a main body and an injection valve. The main body is provided with a cavity and a medicine inlet and a medicine outlet connected to the cavity. The medicine inlet and the medicine outlet are arranged at intervals; the injection valve is arranged in the cavity, and one end of the injection valve close to the medicine inlet is movably connected to the inner wall of the cavity; before injecting medicine, the injection valve moves toward the medicine inlet to close the medicine outlet; when injecting medicine, the injection valve is pressed down toward the side away from the medicine inlet to expose the medicine outlet, so as to connect the medicine inlet and the medicine outlet. The main body and the injection valve of the composite straightener of the technical solution of the present invention break the limitation of the original dosing device being tied to the outside of the pumping pipe or injecting the medicine into the pumping pipe to mix with the oil or liquid. The medicine outlet is opened on the main body, which can make the medicine output large and uniform. The medicine can be fully mixed with the oil before and during the pumping process, avoiding the oil being in a state of agglomeration or waxing during extraction, which is convenient for smooth oil extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the external overall structure of an embodiment of a centralizer of the present invention;

[0028] Figure 2 It is a partial cross-sectional structural schematic diagram of an embodiment of a centralizer of the present invention;

[0029] Figure 3 It is a partial cross-sectional structural schematic diagram of another embodiment of the centralizer of the present invention;

[0030] Figure 4 It is a schematic diagram of the internal structure of another embodiment of the oil well equipment of the present invention.

[0031] Description of Figure Numbers:

[0032] Label name Label name Label name 100 Centralizer 30 Injection structure 50 Injection valve 10 Pipeline 31 main body 51 Elastic parts 11 Line 32 Bezel 52 Valve Seat 12 Rupture disk 33 Drug inlet connector 53 Seals 13 Connectors 34 Medicine valve 54 Float 200 Oil well equipment 35 Upper connector 30C Drug outlet 20A Completion channel 36 Ring stage 30D Medicine trough 201 casing 36A Vias 30E Liquid inlet cavity 202 Oil pipe assembly 30A Cavity 30F Liquid outlet cavity 203 Protection card 30B Drug inlet 30G Limiting steps

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Reference Figures 1 to 2 The present invention provides a centralizer 100, which is applied to an oil well dosing device.

[0039] It should be noted that the centralizer 100 is widely used in the production pipe string of submersible electric pump wells. It is generally connected with four ports and installed on the pump sensor at the lowest end of the submersible electric pump. Its main function is to ensure the centering of the completion pipe string during the process of being lowered into the well, to prevent the high-velocity well fluid from eroding the casing 201 wall and the submersible electric pump unit due to the small space before the well fluid enters the pump, and to protect the pipe string during the lowering process to prevent bumps.

[0040] Refer to Figure 1and Figure 2 As shown, the centralizer 100 includes a main body 30 and an injection valve 50. The main body 30 is provided with a cavity 30A and a drug inlet 30B and a drug outlet 30C connected to the cavity 30A. The drug inlet 30B and the drug outlet 30C are arranged at intervals. The injection valve 50 is movably arranged in the cavity 30A, and the injection valve 50 is used to open or close the drug outlet 30C.

[0041] Define the direction from the oil well inlet to the centralizer 100 as downward, then the drug inlet 30B is set above the drug outlet 30C, and the injection valve 50 moves in the up-down direction to isolate or connect the drug inlet 30B and the drug outlet 30C. The following embodiments will be described based on this up-down orientation.

[0042] In this embodiment, the centralizer 100 is a composite structure, specifically a main body 30 and an injection valve 50 of the composite centralizer 100, to achieve the function of adding medicine to the oil well. The centralizer 100 includes a main body 30 and an injection valve 50, the main body 30 is provided with a cavity 30A and a drug inlet 30B and a drug outlet 30C connected to the cavity 30A, and the drug inlet 30B and the drug outlet 30C are arranged at intervals; the injection valve 50 is arranged in the cavity 30A and elastically connected to the main body 30, and one end of the injection valve 50 close to the drug inlet 30B is movably connected to the inner wall of the cavity 30A; before injecting medicine, the injection valve 50 moves toward the drug inlet 30B to close the drug outlet 30C; when injecting medicine, the injection valve 50 is pressed down to reveal the drug outlet 30C to connect the drug inlet 30B and multiple drug outlets 30C. The main body 30 and the injection valve 50 of the composite centralizer 100 of the technical solution of the present invention break the limitation of the original setting that the dosing device is tied to the outside of the oil pumping pipe or the agent is injected into the oil pumping pipe to mix with the oil. The drug outlet 30C is opened on the main body 30 so that the drug output is large and uniform. The drug can be fully mixed with the oil before and during the oil pumping process to avoid the oil being in a caking or waxing state during extraction, which is convenient for smooth oil pumping and effectively solves the technical problem of the dosing device of the oil well equipment having a small amount of drug output and uneven distribution in the well.

[0043] It is understandable that after the oil well is completed, before the oil is pumped out, chemicals such as bactericides, anti-scaling agents, anti-waxing chemicals, etc. will be injected into the oil well to prevent the oil from agglomerating or waxing, which will affect the oil pumping process and seriously damage the oil pumping equipment 200. Therefore, the effect of injecting chemicals into the oil well is better than adding chemicals into the pumping pipe. Considering the hydraulic pressure difference, an injection pump is set on the ground above the well, and a pipeline 10 is connected to the injection pump. One end of the pipeline 10 extending into the well is connected to the drug inlet 30B for easy injection.

[0044] Optionally, a plurality of drug outlets 30C are provided, and the plurality of drug outlets 30C are spaced apart from each other on the main body 31 .

[0045] In this embodiment, the drug outlet 30C is provided on the main body, and the aperture of the drug outlet 30C can be opened larger to increase the amount of drug discharged. A plurality of drug outlets 30C can be provided on the main body 31 of a straightener 100, and the plurality of drug outlets 30C are arranged at intervals and arranged in a ring around the main body 31. The plurality of drug outlets 30C are simultaneously located in the plane where the radial cross section of the main body 31 is located, and can also be distributed in a cross-staggered manner in the axial direction of the main body 31. The provision of a plurality of drug outlets 30C increases the drug discharge range and the amount of drug discharged, and while increasing the amount of drug discharged, improves the uniformity of drug discharge, reduces the time for diffusion, effectively and accelerates the mixing of the drug and the oil, and prevents the oil from agglomerating or waxing.

[0046] Optionally, the centralizer 100 further includes a plurality of baffles 32 , which are arranged in a ring-like manner on the main body 30 , each baffle 32 is arranged parallel to the axial direction of the main body 30 , and a drug outlet 30C is arranged between two adjacent baffles 32 .

[0047] In this embodiment, a plurality of baffles 32 are arranged at intervals on the outer peripheral wall of the main body 30, and each baffle 32 is arranged to extend along the axial direction of the main body 30, so as to realize the straightening function of the main body 30 of the straightener 100. A cavity 30A is provided inside the main body 30 for accommodating the injection valve 50 and the medicine. The injection valve 50 is movably arranged in the cavity 30A, and moves upward toward the medicine inlet 30B before the medicine is injected, so as to cut off the connection between the medicine inlet 30B and the medicine outlet 30C, or moves downward under pressure to connect the medicine inlet 30B and the medicine outlet 30C during the injection. There are multiple medicine outlets 30C, and each medicine outlet 30C is arranged between two adjacent baffles 32, so as to increase the medicine outlet, so as to make the medicine output large and uniform, which is conducive to the smoothness of oil extraction.

[0048] It can be understood that a medicine outlet groove 30D is formed between two adjacent baffles 32, and the main body 30 is provided with a plurality of medicine outlets 30C, each of which penetrates a medicine outlet groove 30D, and the medicine outlet 30C connects the volume chamber 30A and the medicine outlet groove 30D. When injecting medicine, the injection valve 50 is pressed down to connect the medicine inlet 30B and the medicine outlet 30C, and the medicine flows out into the oil through the medicine outlet 30C. The two side walls of the medicine outlet groove 30D limit the diffusion range of the medicine. Multiple baffles 32 correspond to multiple medicine outlet grooves 30D. In order to facilitate uniform and large-dose medicine discharge, each medicine outlet groove 30D is provided with a medicine outlet 30C to increase the amount of medicine discharged, so that the medicine is discharged uniformly and orderly on the peripheral side close to the main body 30.

[0049] Optionally, the centralizer 100 further includes an upper joint 35 , which is disposed at one end of the main body 31 where the drug inlet 30B is opened, and the drug outlet 30C is disposed at one end of the main body 31 away from the upper joint 35 .

[0050] In this embodiment, an upper joint 35 is provided at the upper end of the centralizer 100 for connecting to the bottom of other pipe string components of the oil pumping equipment, and the drug inlet 30B is provided at one end of the main body 31 where the upper joint 35 is provided, wherein the drug inlet 30B can be provided at the drug outlet trough 30D, and the baffle is used as a protection to improve the connection stability between the drug inlet 30B and the drug delivery pipeline 10.

[0051] Optionally, an annular platform 36 is protruded from the inner wall of the cavity 30A, which divides the cavity 30A into a liquid inlet cavity 30E and a liquid outlet cavity 30F, and a through hole 36A connecting the liquid inlet cavity 30E and the liquid outlet cavity 30F is opened, the drug inlet 30B is connected to the liquid inlet cavity 30E, and the drug outlet 30C is connected to the liquid outlet cavity 30F; the injection valve 50 is arranged in the liquid outlet cavity 30F and is slidably connected to the inner wall of the liquid outlet cavity 30F, and the injection valve 50 movably abuts the annular platform 36 to cover the through hole 36A.

[0052] In this embodiment, the annular platform 36 is convexly arranged on the inner wall of the chamber 30A, and the chamber space is divided into a liquid inlet chamber 30E and a liquid outlet chamber 30F. The annular platform 36 is provided with a through hole 36A connecting the liquid inlet chamber 30E and the liquid outlet chamber 30F, and the drug inlet 30B is connected to the liquid inlet chamber 30E. The side wall of the annular platform 36 toward the liquid outlet chamber 30F forms a limited step 30G, and the injection valve 50 is arranged in the liquid outlet chamber 30F, one end of which is fixedly connected to the bottom of the main body 31, and the other end is sealed and abutted against the inner wall of the liquid outlet chamber 30F and slidably connected. Before oil injection, the injection valve 50 abuts the annular platform 36, the side seal of the injection valve 50 abuts the inner wall of the liquid outlet chamber 30F, and the top seal of the upper end of the injection valve 50 abuts the limiting step 30G to cover the through hole 36A and separate the liquid inlet chamber 30E and the liquid outlet chamber 30F; during oil injection, the injection valve 50 leaves the annular platform 36, so that the through hole 36A connects the liquid inlet chamber 30E and the liquid outlet chamber 30F, and the injection valve 50 moves in a direction away from the through hole 36A to reveal multiple drug outlets 30C, so that the multiple drug outlets 30C are connected to the drug inlet 30B, thereby increasing the drug output amount and the uniformity of the drug output. The drug can be fully mixed with the oil before and during oil pumping, avoiding the oil from being in a lumpy or waxy state during extraction, facilitating smooth oil pumping, and effectively solving the technical problem of small drug output and uneven distribution of the drug dosing device in the well.

[0053] It can be understood that the provision of the liquid inlet chamber 30E allows the medicine to gather inside the main body 31, which helps to apply pressure to the valve seat 52 so that the valve seat 52 is pressed down to connect the liquid inlet chamber 30E and the medicine outlet 30C. The provision of multiple medicine outlets 30C allows the medicine to be discharged in large quantities and evenly.

[0054] Optionally, the injection valve 50 includes an elastic member 51 and a valve seat 52. The elastic member 51 is arranged in the liquid outlet 30E, and one end of the elastic member 51 is connected to the end of the main body 30 away from the through hole 36A; the valve seat 52 is connected to the other end of the elastic member 51 and is sealed and abutted against the inner wall of the liquid outlet cavity 30F. The elastic member 51 drives the valve seat 52 to slide and connect with the inner wall of the liquid outlet cavity 30F to cover the through hole 36A.

[0055] In this embodiment, the injection valve 50 is arranged in the cavity 30A of the main body 30. The injection valve 50 includes an elastic member 51 and a valve seat 52. The elastic member 51 makes the valve seat 52 movably connected to the main body 30. The valve seat 52 is sealed against the inner wall of the liquid outlet cavity 30F to prevent the liquid from flowing back from the liquid outlet cavity 30F to the liquid inlet cavity 30E. Before injecting the medicine, the elastic member 51 drives the valve seat 52 to slide and connect with the inner wall of the liquid outlet cavity 30F to cover the through hole 36A. When injecting the medicine, the medicine continuously enters the cavity 30A through the medicine inlet 30B. Under the hydraulic pressure of the medicine, the valve seat 52 is away from the annular platform 36, so that the liquid inlet cavity 30E and the liquid outlet cavity 30F are connected. The hydraulic pressure of the medicine pushes the valve seat 52 to move downward to reveal the medicine port 30C. The medicine in the cavity 30A is discharged from the main body 30 through multiple medicine outlets 30C. The medicine enters the downhole oil and is fully mixed with the oil, which improves the reliability of the medicine.

[0056] Optionally, the injection valve 50 also includes a float 54, the diameter of which is larger than the aperture of the through hole 36A and is movably disposed in the liquid outlet cavity 30F; the elastic member 51 drives the valve seat 52 to abut the float 54, so that the float 54 abuts the annular platform 36 to seal the edge of the through hole 36A.

[0057] Combined with reference Figure 3 As shown, in this embodiment, the injection valve 50 further includes a float 54, which is movably arranged in the liquid outlet cavity 30F, and the diameter of the float 54 is larger than the aperture of the through hole 36A, and the float 54 is located between the valve seat 52 and the annular platform 36. When no medicine is injected, the elastic member 51 drives the valve seat 52 to move upward, and the float 54 is abutted by the valve seat 52 to between the limiting step 30G and the valve seat 52, and the float 54 is closely abutted with the limiting step, that is, the float 54 is sealed and connected to the edge of the through hole 36A, so as to improve the sealing performance; when injecting medicine, the float 54 is pressed by the medicine to leave the limiting step 30G, and the medicine presses the valve seat 52 downward to reveal the medicine port 30C, so that the medicine inlet 30B and the medicine outlet 30C are connected, which is convenient for the medicine application; at this time, the float 54 is in a free moving state, or the float 54 is hydraulically moved downward synchronously with the valve seat 52, so as to improve the smoothness of medicine discharge.

[0058] Optionally, the injection valve 50 further includes a sealing member 53 , which is sleeved on the valve seat 52 and sealingly abuts against the inner wall of the liquid outlet cavity 30F.

[0059] In this embodiment, the injection valve 50 includes an elastic member 51 and a valve seat 52. The injection valve 50 also includes a sealing member 53. The sealing member 53 is sleeved on the valve seat 52 and is used for sealing the valve seat 52 and the inner wall of the cavity 30A of the main body 30, so that the oil will not reversely enter the cavity 30A and the drug inlet 30B, ensuring that the direction of drug application is from the drug inlet 30B to the drug outlet 30C, thereby improving the smoothness of drug addition.

[0060] Optionally, the straightener 100 further includes a drug inlet connector 33 and a drug inlet valve. The drug inlet connector 33 is disposed at a drug inlet port 30B of the main body 30. A through hole is disposed in the middle of the drug inlet connector 33, the through hole being connected to the drug inlet port 30B. The drug inlet valve is disposed in the through hole, and the drug inlet valve is a one-way valve.

[0061] In this embodiment, the centralizer 100 further includes a drug inlet connector 33, which is disposed at the drug inlet 30B and is used to be detachably connected to the pipeline 10 of the injection pump. Specifically, the drug inlet connector 33 is disposed on the peripheral side of the main body 30 adjacent to the drug inlet 30B, and a through hole is provided in the middle of the drug inlet connector 33, which is connected to the drug inlet 30B. During drug injection, under the hydraulic pressure of the drug, the valve seat 52 moves downward to expose the drug port 30C, so as to sequentially connect the drug inlet 30B, the liquid inlet chamber 30E, the through hole 36A, the liquid outlet chamber 30F and the drug outlet 30C. At this time, the oil pumping equipment 200 extracts the oil, and the oil hydraulic pressure is relatively high. When the hydraulic pressure in the cavity 30A is less than the oil hydraulic pressure, there is a possibility of reverse flow. The technical solution of the present invention sets a drug inlet valve at the drug inlet 30B, and sets it as a one-way valve, so that the drug liquid or oil cannot flow to the outside of the main body 30 through the cavity 30A and the drug inlet 30B, thereby ensuring the correct flow direction of the drug injection and improving the reliability of the drug injection.

[0062] It can be understood that the drug inlet 30B can be arranged on the top or side of the main body 30. In an optional embodiment, the drug inlet 30B runs through one end of any liquid outlet trough, so that when the pipeline 10 is connected to the drug inlet connector 33, the baffle 32 on the main body 30 has a protective effect on the connection between the pipeline 10 and the drug inlet connector 33, thereby improving the connection stability and reliability and avoiding friction, extrusion, or even detachment during the process of going down the well or pumping oil.

[0063] It is understandable that each drug outlet 30C is provided with a drug outlet valve 34, and the drug outlet valve 34 is a one-way valve, so that the drug liquid can only flow from the cavity 30A to the outside of the main body 30, thereby improving the reliability of drug injection.

[0064] Specific reference Figure 4As shown, the present invention also proposes an oil well equipment 200, which is applied to the field of oil well development technology. The oil well equipment 200 includes a casing 201, a centralizer 100 as any one of the above items, and an oil injection pump. The specific structure of the centralizer 100 refers to the above embodiment. Since the oil well equipment 200 of the present invention adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the casing 201 is arranged in the oil well and forms a completion channel 20A; the centralizer 100 is movably arranged in the completion channel 20A; the oil injection pump is arranged outside the well and is provided with a pipeline 10, and a connector is provided at one end of the pipeline 10 facing the centralizer 100; the connector can be detachably connected to the drug inlet connector 33 of the centralizer 100.

[0065] In this embodiment, the oil well equipment 200 includes a ground injection pump, a chemical injection pipeline 10 and a chemical injection valve 50 at the lowest section. The injection valve 50 for chemical injection is a one-way valve composed of a spring and a valve ball. In the specific implementation process, a rupture disk 12 is provided inside the chemical injection valve 50, which is used to keep the pipeline 10 airtight during the lowering process and to monitor whether the downhole pipeline 10 is damaged during the lowering process. The pipeline 10 includes a line body 11 and a connector 13. The rupture disk 12 can also be provided on the pipeline 10 and is located inside the line body 11, wherein the line body 11 is a hollow transmission line for transmitting chemicals. After the lowering is completed, the rupture disk 12 in the chemical injection valve 50 can be pressed from the ground to break the rupture disk 12 to achieve injection, and the chemical is discharged through multiple drug outlets 30C of the centralizer 100 compounded with the injection valve 50, thereby improving the smoothness of oil extraction.

[0066] It can be understood that the oil well equipment 200 also includes an oil pipe assembly 202 and a protection card 203. The oil pipe assembly 202 is connected to the top of the stabilizer 100. The top of the stabilizer 100 is provided with an upper joint 35, and the upper joint 35 is detachably connected to the oil pipe assembly 202; the protection card 203 is sleeved on the oil pipe assembly 202, and the protection card 203 is provided with a threading hole, and the pipeline 10 is passed through the threading hole, which is used to limit the pipeline 10 and protect the pipeline 10 at the same time, so as to avoid damage to the pipeline 10 during the downhole process, increase the reliability of the pipeline 10 in transmitting the agent, and improve the completion efficiency.

[0067] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A centralizer, used in oil well dosing device, It is characterized in that The centralizer comprises: A main body, wherein the main body is provided with a containing cavity and a drug inlet and a drug outlet communicating with the containing cavity, wherein the drug inlet and the drug outlet are spaced apart; and An injection valve, the injection valve is movably disposed in the cavity, and the injection valve is used to open or close the medicine outlet; The medicine inlet is arranged at the top of the main body; There are multiple drug outlets, and the multiple drug outlets are arranged in a spacer ring on the main body. The multiple drug outlets are arranged in a staggered manner in the axial direction of the main body, and each drug outlet is provided with a drug outlet valve; The centralizer further comprises a plurality of baffles, wherein the plurality of baffles are arranged in a spacer ring on the main body, each baffle is arranged parallel to the axial direction of the main body, and a drug outlet is arranged between two adjacent baffles; A medicine outlet groove is formed between two adjacent baffles, each medicine outlet penetrates through a medicine outlet groove, and the medicine outlet communicates with the cavity and the medicine outlet groove; The centralizer further comprises an upper joint, the upper joint being arranged at one end of the main body where the medicine inlet is provided, and the medicine outlet being arranged at one end of the main body away from the upper joint; The inner wall of the cavity is convexly provided with an annular platform, the annular platform divides the cavity into a liquid inlet cavity and a liquid outlet cavity, and a through hole connecting the liquid inlet cavity and the liquid outlet cavity is provided, the drug inlet is connected to the liquid inlet cavity, and the drug outlet is connected to the liquid outlet cavity; the injection valve is arranged in the liquid outlet cavity and is slidably connected to the inner wall of the liquid outlet cavity, and the injection valve movably abuts against the annular platform to cover the through hole; The injection valve comprises an elastic member and a valve seat, wherein the elastic member is arranged in the liquid outlet cavity and one end of the elastic member is connected to an end of the main body away from the through hole, and the valve seat is connected to the other end of the elastic member and is in sealing contact with the inner wall of the liquid outlet cavity, and the elastic member drives the valve seat to slide and connect with the inner wall of the liquid outlet cavity to cover the through hole; The injection valve further comprises a sealing member, which is sleeved on the valve seat and sealably abuts against the inner wall of the liquid outlet cavity; The injection valve further includes a float ball, the diameter of which is larger than the aperture of the through hole, and the float ball is movably disposed in the liquid outlet cavity, and the elastic member drives the valve seat to abut against the float ball, so that the float ball abuts against the annular platform to seal and connect the edge of the through hole; The straightener also includes a drug inlet connector and a drug inlet valve. The drug inlet connector is arranged at the drug inlet port of the main body. A through hole is arranged in the middle of the drug inlet connector, and the through hole is connected to the drug inlet port. The drug inlet valve is arranged in the through hole, and the drug inlet valve is a one-way valve.

2. An oil well equipment, It is characterized in that The oil well equipment comprises: Casing, which is arranged in the oil well and forms a well completion passage; The centralizer according to claim 1, wherein the centralizer is movably disposed in the completion passage; and An oil injection pump is arranged outside the well and is provided with a pipeline. A connecting piece is provided at one end of the pipeline facing the centralizer, and the connecting piece can be detachably connected to the drug inlet of the centralizer.

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