Underground electric high-pressure jet flow pipe device and cleaning method of underground separate injection pipe column

Abstract

The invention provides an underground electric high-pressure jet flow pipe communicating device and a cleaning method of an underground separate injection pipe column. The pipe communicating device comprises a pipe communicating device body and a pressurizing assembly. A cable connecting area and a pressurizing cavity are sequentially formed in the pipe dredging device body from top to bottom; a liquid inlet channel and a liquid outlet channel which are communicated with the pressurizing cavity are formed in the pipe dredging device body, the liquid inlet channel is located on the upper side of the pressurizing cavity, and the liquid outlet channel is located on the lower side of the pressurizing cavity; the pressurizing assembly comprises a driving part, a whipping part and a bubble generator; the driving piece is located in the cable connecting area and can be connected with a cable; the whipping piece and the bubble generator are both located in the pressurizing cavity; the driving part is used for driving the whipping part so as to scatter liquid entering the pipe dredging device body; the bubble generator is arranged at the bottom of the pressurizing cavity and used for generating bubbles. According to the underground electric high-pressure jet flow pipe device, viscous oil and corrosion scaling products in a separate injection pipe column can be removed, and the measuring and adjusting efficiency of a separate injection well is improved.

Description

Technical Field

[0001] The present application relates to the field of oilfield water injection equipment, and in particular to a downhole electric high-pressure jet pipe and a cleaning method for a downhole injection pipe column. Background Art

[0002] In order to make up for the underground deficit caused by crude oil extraction, maintain or increase the oil layer pressure, achieve high and stable production of oil fields, and obtain a higher recovery rate, it is necessary to inject water into the oil field. Oil field water injection is one of the important means to replenish energy to the formation and improve the oil field recovery rate during the development of the oil field.

[0003] When injecting water into a multi-layer reservoir, if the pressure and permeability of each layer are quite different, in order to achieve a good water injection effect for each layer, each layer must be injected with water separately. This is called stratified water injection. There are two ways of stratified water injection: single-well single-layer and single-well multi-layer injection. The former is to use different injection wells with different injection well networks to achieve injection for different injection layers. Its water injection process is simple, but the number of wells is too large and the investment is too large. The latter is to divide the injection layer into different layers according to its oil layer properties and pressure in the same injection well, and use an injection string composed mainly of a packer and a water distributor to inject water into each layer at different pressures. In the process of using a multi-stage packer and a water distributor in combination, due to the different pressures and water absorption of different oil layers, it is necessary to adjust the size of the water nozzle of the water distributor corresponding to each layer from time to time. For this purpose, it is necessary to use a test instrument to test and adjust the injection well.

[0004] During the testing and adjustment process of some injection wells, problems such as difficulty in lowering instruments and inaccurate testing will occur, which greatly affects the testing and adjustment efficiency of the injection wells. The condensation of heavy oil and corrosion and scaling products in the downhole injection string are the main reasons for the low testing and adjustment efficiency of the injection wells. Therefore, in order to improve the testing and adjustment efficiency of the injection wells, it is necessary to remove the viscous oil and corrosion and scaling products in the injection string in time to achieve the purpose of removing pipe scale. Summary of the invention

[0005] In order to promptly remove sticky oil and corrosion scaling products in the injection string, solve the problem of slow or impossible lowering of measurement and adjustment tools, and improve the measurement and adjustment efficiency of injection wells, the present application provides a downhole electric high-pressure jet pipe and a cleaning method for a downhole injection string.

[0006] In the first aspect, the present application discloses a downhole electric high-pressure jet pipe, and adopts the following technical solution:

[0007] A downhole electric high-pressure jet pipe cleaner, comprising a pipe cleaner body and a pressurizing component;

[0008] The main body of the pipe cleaner is provided with a cable connection area and a pressurizing chamber in sequence from top to bottom;

[0009] The pipe cleaner body is provided with a liquid inlet channel and a liquid outlet channel connected with the pressurizing chamber, wherein the liquid inlet channel is located at the upper side of the pressurizing chamber, and the liquid outlet channel is located at the lower side of the pressurizing chamber;

[0010] The pressurizing component includes a driving member, a whipping member and a bubble generator;

[0011] The driving member is located in the cable connection area and can be connected to the cable;

[0012] The whipping element and the bubble generator are both located in the pressurized chamber;

[0013] The driving member is used to drive the whipping member to break up the liquid entering the pipe cleaner body;

[0014] The bubble generator is arranged at the bottom of the pressurization chamber and is used to generate bubbles.

[0015] By adopting the above technical solution, the high-pressure jet pipe is connected to the cable on the ground and lowered into the wellbore. After reaching the obstruction position, water is injected from the wellhead, and the water flows into the booster chamber through the liquid inlet channel. The liquid is rotated at high speed by the whipping element to break up the viscous oil and impurities mixed in the liquid, and then it is sprayed out through the bottom bubble generator after speeding up and pressurizing, forming a fluid containing a large number of bubbles. Since the aperture of the liquid outlet channel is further reduced, the fluid flow rate and pressure are further increased, and then the viscous oil and scale on the pipe wall are cleaned, the impact force is large, the cleaning effect is good, and the phenomenon of impurities blocking the liquid inlet channel and the liquid outlet channel is reduced.

[0016] Optionally, the downhole electric high-pressure jet flow pipe device further includes a magnetic induction component;

[0017] The magnetic induction component is arranged between the driving member and the whipping member, so that the whipping member can rotate under the driving of the driving member.

[0018] Optionally, the magnetic induction component includes a first magnetic suspension rotor and a second magnetic suspension rotor that are arranged opposite to each other;

[0019] The first magnetic suspension rotor is located in the cable connection area and is connected to the driving member;

[0020] The second magnetic suspension rotor is located in the boost chamber and connected to the whipping element;

[0021] The driving member can drive the first magnetic suspension rotor to rotate, so as to drive the second magnetic suspension rotor and the whipping member to rotate.

[0022] By adopting the above technical solution, the first magnetic levitation rotor and the second magnetic levitation rotor realize wireless connection between the driving member and the whipping member through the principle of electromagnetic induction, so that the whipping member can rotate under the drive of the driving member, thereby facilitating the operation of the whipping member controlled by cables on the ground.

[0023] Optionally, the whipping element is a screw pump.

[0024] By adopting the above technical solution, the screw pump can generate greater energy during operation, so that the liquid entering the boosting chamber is stirred at high speed, thereby achieving speed increase and pressure increase.

[0025] Optionally, the inner diameter of the liquid inlet channel is larger than the inner diameter of the liquid outlet channel.

[0026] Optionally, the downhole electric high-pressure jet pipe further includes an aperture adjustment component, wherein the aperture adjustment component is disposed at the lower side of the liquid outlet channel and is used to adjust the inner diameter of the liquid outlet channel.

[0027] Optionally, the aperture adjustment assembly includes an adjustment sleeve and an adjustment rod, wherein the adjustment sleeve is embedded in the pipe cleaner body and located at the lower side of the liquid outlet channel;

[0028] The adjustment sleeve is made of elastic material;

[0029] The adjusting rod is located at the bottom of the adjusting sleeve;

[0030] The adjusting rod can move upward and push the adjusting sleeve to deform, so that the inner diameter of the liquid outlet channel is reduced.

[0031] By adopting the above technical solution, when the adjusting rod moves upward along the axial direction of the pipe cleaner body, the adjusting rod presses against the adjusting sleeve, so that the liquid outlet channel is reduced, and vice versa, the liquid outlet channel is expanded. In the process of the adjusting rod pushing upward, the adjusting sleeve is also pushed to deform, changing the direction of the liquid outlet channel. Thus, by controlling the size and direction of the liquid outlet channel, the water flow can be realized from the liquid inlet channel to the liquid outlet channel, so as to achieve the best jet impact effect.

[0032] Optionally, the aperture adjustment assembly also includes a guide cone, which is located at the bottom of the adjustment rod and is threadedly connected to the pipe clearer body. The guide cone can move upward and push the adjustment rod and the adjustment sleeve upward to reduce the inner diameter of the liquid outlet channel.

[0033] By adopting the above technical solution, the guide cone can seal the adjustment sleeve and the adjustment rod on the one hand, and on the other hand, the lower end of the guide cone is conical, which can reduce the resistance encountered by the pipe cleaner during the downward movement.

[0034] Optionally, the downhole electric high-pressure jet pipe cleaner further comprises a sealing mechanism, which is arranged at the side wall of the pipe cleaner body and is used for sealing the pipe cleaner body and unsealing the pipe cleaner body.

[0035] Optionally, the setting mechanism includes a setting sleeve and a sliding sleeve;

[0036] The setting sleeve and the sliding sleeve are both arranged axially along the pipe clearing device body;

[0037] The sliding sleeve is slidably connected to the outer side wall of the pipe cleaner body;

[0038] There are two sliding sleeves, and the two sliding sleeves are respectively connected to the upper and lower ends of the setting sleeve;

[0039] The two sliding sleeves can move closer to or farther from each other, so that the setting sleeve can be squeezed and expanded or stretched and restored.

[0040] Optionally, the sealing mechanism further comprises a driving source that can be connected to the driving member, and the driving source is disposed in the pipe-clearing device body and is used to drive the two sliding sleeves to move closer to or away from each other.

[0041] By adopting the above technical solution, the driving source drives the sliding sleeve to move axially along the pipe clearing device body, so that the setting sleeve expands or stretches and restores radially, thereby adjusting the outer diameter to adapt to the change of the downhole pipe diameter.

[0042] Optionally, it also includes a cable connection sealing assembly, which is arranged at the upper end of the pipe cleaner body and is used to fix and seal the cable.

[0043] Optionally, the cable fixing assembly comprises a mushroom head and a tapered tube; the mushroom head is threadedly connected to the pipe cleaner body, and the tapered tube is located at the lower side of the mushroom head;

[0044] The mushroom head and the conical tube are both hollow to allow the cable to pass through;

[0045] The lower end of the conical tube is in a petal shape;

[0046] The mushroom head can move downward and press the lower end of the tapered tube inwardly, so that the lower end of the tapered tube is tightened inwardly to hold the cable tightly.

[0047] Optionally, the outer diameter of the tapered tube gradually increases from top to bottom, and the inner diameter of the mushroom head gradually decreases from top to bottom.

[0048] By adopting the above technical solution, the cable passes through the top mushroom head and the conical tube and is connected to the driving member. When the mushroom head is tightened, the mushroom head moves downward, and the lower end of the conical tube is squeezed by the mushroom head, thereby tightening inward and holding the cable, fixing the cable and the mushroom head, and at the same time playing the role of the first-level seal.

[0049] Optionally, a salvage groove is milled on the outer side wall of the mushroom head.

[0050] By adopting the above technical solution, the salvage trough is used in conjunction with the bailing device to facilitate salvage. The nominal diameter of the salvage trough is consistent with the outer diameter and depth of the eccentric bailing device currently used in the oil field. Once the cable is pulled out and the tool falls into the well, the eccentric bailing tool can be used universally.

[0051] In a second aspect, the present application discloses a method for cleaning a downhole injection string, using the downhole electric high-pressure jet pipe as described in the first aspect, comprising:

[0052] Connect the electric high-pressure jet conduit to the cable on the ground;

[0053] Lower the electric high-pressure jet pipe into the downhole injection string;

[0054] Water is injected from the wellhead, and the water flows into the booster chamber through the liquid inlet channel;

[0055] The driving member is activated on the ground through a cable and drives the whipping member to rotate, so as to increase the water flow speed and water flow pressure;

[0056] Water is ejected at high speed from the outlet channel to clean the wall of the downhole injection string.

[0057] Based on the above technical solution, the electric high-pressure jet conduit in this application has the following beneficial effects compared with the prior art:

[0058] The high-pressure jet pipe in the present application is electrically controlled. After the cable is connected on the ground, it is lowered into the wellbore. After reaching the obstruction position, water is injected from the wellhead. The water flows into the booster chamber through the liquid inlet channel. The liquid is rotated at high speed by the whipping element to break up the viscous oil, impurities, etc. mixed in the liquid, and then it is sprayed out through the bottom bubble generator after speeding up and pressurizing to form a fluid containing a large number of bubbles. Since the aperture of the liquid outlet channel is further reduced, the fluid flow rate and pressure are further increased, and then the viscous oil and scale on the pipe wall are cleaned, the impact force is large, the cleaning effect is good, and the phenomenon of impurities blocking the liquid inlet channel and the liquid outlet channel can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a schematic diagram of the overall structure of the downhole electric high-pressure jet pipe in the embodiment of the present application;

[0060] Figure 2It is a partial structural schematic diagram of a cable connection sealing assembly in an embodiment of the present application;

[0061] Description of reference numerals:

[0062] 10. pipe cleaner body; 11. cable connection area; 12. pressurization chamber; 121. liquid inlet hole; 122. liquid outlet hole; 13. liquid inlet channel; 14. liquid outlet channel;

[0063] 20. Cable connection sealing assembly; 21. Mushroom head; 211. Salvage trough; 22. Conical tube;

[0064] 30. Pressurizing component; 31. Driving component; 32. Whisking component; 33. Bubble generator;

[0065] 40. Cables;

[0066] 50. Magnetic induction component; 51. First magnetic suspension rotor; 52. Second magnetic suspension rotor;

[0067] 60. Aperture adjustment assembly; 61. Adjustment sleeve; 62. Adjustment rod; 63. Guide cone;

[0068] 70. Sealing mechanism; 71. Sealing sleeve; 72. Sliding sleeve; 73. Driving source. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0070] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0071] In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0072] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0073] At present, when removing sticky oil and corrosion scaling products in the downhole injection pipe string, according to the working principle, the main pipe cleaning technologies mainly include the following three types, namely mechanical rotary drilling pipe cleaning technology, mechanical shock anti-stuck pipe cleaning technology and ground pipeline jet pipe cleaning technology. Among them, the mechanical rotary drilling pipe cleaning technology mainly uses the bottom drill bit to rotate at high speed and drill downward by gravity to achieve the purpose of pipe cleaning; the mechanical shock anti-stuck pipe cleaning technology is to achieve the purpose of cleaning and descaling by repeatedly lifting and lowering, using gravity to impact the obstructed position; the jet pipe cleaning technology uses a pipe cleaner to convert the pressurized water of the pump truck into a high-speed jet with bubbles to impact the pipe wall, remove sticky oil and corrosion scaling products, and achieve the purpose of removing pipe scale.

[0074] The inventors have found that the jet-type pipe cleaning technology has a strong ability to remove pipe scale and has good effects on sticky oil, corrosive scale, mud and sand. However, in the current jet-type pipe cleaning technology, the water flow is pressurized mainly by reducing the cross-sectional area of ​​the water flow, that is, after the water flows through the jet channel of the jet nozzle, the pressure is further increased, forming a high-pressure water flow that strongly impacts the pipe wall. However, the liquid in the downhole injection string usually has the phenomenon of sticky oil and lumps, and the liquid entering the pipe cleaner is often mixed with larger impurities, which will affect the final pressure of the water flow, reduce the final impact force, and easily cause the pipe cleaner to be blocked.

[0075] Therefore, based on the problems existing in the above-mentioned related technologies, the embodiments of the present application provide a method for cleaning a downhole electric high-pressure jet pipe and a downhole injection string.

[0076] In the first aspect, a downhole electric high-pressure jet pipe device disclosed in the embodiment of the present application is referred to as Figure 1, including a pipe cleaner body 10, a cable connection sealing assembly 20 and a boosting assembly 30. The pipe cleaner body 10 is provided with a liquid inlet channel 13 and a liquid outlet channel 14 connected to the boosting chamber 12. The liquid inlet channel 13 is located on the upper side of the boosting chamber 12, and the liquid outlet channel 14 is located on the lower side of the boosting chamber 12. At the same time, the pipe cleaner body 10 is provided with a cable connection area 11 and a boosting chamber 12 from top to bottom. The cable connection sealing assembly 20 is arranged in the cable connection area 11 for fixing and sealing the cable. The boosting assembly 30 includes a driving member 31, a whipping member 32 and a bubble generator 33, wherein the driving member 31 is arranged in the cable connection area 11 and can be sealed and plugged with the cable 40. The whipping member 32 and the bubble generator 33 are arranged in the boosting chamber 12, and the driving member 31 is used to drive the whipping member 32 to break up the liquid entering the pipe cleaner body 10. The bubble generator 33 is used to generate bubbles.

[0077] After the high-pressure jet flow pipe is lowered into the wellbore to the obstruction position, water is injected from the wellhead, and the water flows through the liquid inlet channel 13 and enters the boost chamber 12. At this time, the driving member 31 is controlled to run on the ground through the cable 40, driving the whipping member 32 to rotate at high speed. The water flows through the bubble generator 33 to form a high-speed bubble jet, and finally ejects from the liquid outlet channel 14 at high speed. In this process, the whipping member 32 is conducive to breaking up the impurities such as sticky oil mixed in the water flow to reduce the possibility of impurities blocking the liquid outlet channel 14. At the same time, the high-speed whipping process can further increase the water flow speed and meet the water pressure requirements. The bubble generator 33 further increases the overall impact energy of the water flow by generating bubbles. Thereby, under the dual effect of the energy generated by the water flow impact and the bubble explosion, the strength of removing impurities such as sticky oil and scale on the pipe wall can be further improved, so as to achieve the purpose of cleaning the pipe wall and reducing the probability of encountering resistance in measurement and adjustment.

[0078] In an alternative embodiment, referring to Figure 1 , the driving member 31 can be arranged in the cable connection area 11 by welding, and the driving member 31 can be specifically a motor. The end of the cable 40 has a plug connector (not marked in the figure), and the cable 40 is plug-connected to the motor through the plug connector. Specifically, after the successful connection, the connecting sleeve on the outside of the plug connector is rotated. It should be understood that the connecting sleeve has two sealing rubber rings on the upper and lower parts. After the connection is successful, high-pressure sealing grease is injected inward from the lower grease injection hole of the connecting sleeve, and the sealing grease is squeezed out from the upper grease injection hole, so that the driving member 31 and the cable 40 are sealed. Connection. It should be understood that although the connecting sleeve, sealing rubber ring and other related structures are not marked in the figure, since this part of the structure belongs to the existing technology related to cable sealing, those skilled in the art can implement it according to relevant common sense.

[0079] In an alternative embodiment, referring to Figure 1The upper end of the pipe cleaner body 10 is provided with a cable connection sealing assembly 20. After the cable 40 is connected to the driving member 31, the cable connection sealing assembly 20 can be used to fix and seal the connection between the cable 40 and the driving member 31. Figure 2 The cable connection sealing assembly 20 includes a mushroom head 21 and a tapered tube 22. An opening is provided at the upper end of the pipe cleaner body 10, and the mushroom head 21 is located at the opening and can close the opening. The mushroom head 21 is threadedly connected to the pipe cleaner body 10, and the tapered tube 22 is located at the lower side of the mushroom head 21. The mushroom head 21 and the tapered tube 22 are both hollow to allow the cable 40 to pass through. Specifically, the tapered tube 22 is elastic and its diameter gradually increases from top to bottom, and the lower end of the tapered tube 22 is in a petal shape; the inner diameter of the mushroom head 21 gradually decreases from top to bottom. In actual use, the cable 40 can pass through the top mushroom head 21 and the tapered tube 22 and then be connected to the driving member 31. When the mushroom head 21 is tightened, the mushroom head 21 moves downward, and the lower end of the tapered tube 22 is squeezed by the mushroom head 21, and tightens inward along the downward taper inside the mushroom head 21 to hold the cable 40, thereby fixing and sealing the cable 40 together.

[0080] In an alternative embodiment, referring to Figure 1 A salvage groove 211 is milled on the outer wall of the mushroom head 21. It should be noted that the nominal diameter of the salvage groove 211 is consistent with the outer diameter and depth of the eccentric salvage tool currently used in the oil field. Once the cable 40 is pulled out and the tool falls into the well, the eccentric salvage tool can be used in conjunction with the salvage groove 211 to salvage the pipe cleaner.

[0081] In an alternative embodiment, referring to Figure 1 The pressurizing chamber 12 has a liquid inlet hole 121 at the upper end and a liquid outlet hole 122 at the lower end. The liquid inlet hole 121 is connected to the liquid inlet channel 13, and the liquid outlet hole 122 is connected to the liquid outlet channel 14.

[0082] Further, in an optional embodiment, referring to Figure 1 In order to enable the driving member 31 to drive the whipping member 32 to rotate, the downhole electric high-pressure jet pipe device also includes a magnetic induction component 50, which is arranged between the driving member 31 and the whipping member 32. Specifically, the magnetic induction component 50 includes a first magnetic suspension rotor 51 and a second magnetic suspension rotor 52 that are arranged opposite to each other. The first magnetic suspension rotor 51 is located in the cable connection area 11 and is fixedly connected to the output shaft of the driving member 31; the second magnetic suspension rotor 52 is located in the boosting chamber 12 near the liquid inlet hole 121.

[0083] Reference Figure 1, the whipping member is fixedly connected to the second magnetic suspension rotor, and the whipping member 32 is preferably a screw pump. In other embodiments, a rotor pump, an impeller pump, etc. can also be selected, as long as it can achieve stirring and breaking up the liquid entering the boost chamber 12. When the cable 40 is connected to the driving member 31, the driving member 31 is started by controlling the cable 40 on the ground, and the driving member 31 drives the first magnetic suspension rotor 51 to rotate, forming a rotating magnetic field. According to the principle of electromagnetic induction, the second magnetic suspension rotor 52 also rotates in this rotating magnetic field, thereby driving the whipping member 32 to rotate. Therefore, according to the principle of magnetic induction, the driving member 31 can drive the whipping member 32 to rotate, without setting a large number of cables, which is efficient and convenient, and can reduce the possibility of leakage.

[0084] In an alternative embodiment, referring to Figure 1 The bubble generator 33 is arranged at the lower side of the whipping element 32 and is used to generate bubbles. When the water flows into the pressurizing chamber 12 through the liquid inlet channel 13 and the liquid inlet hole 121, it first passes through the whipping element 32, which rotates at a high speed to break up the viscous oil and impurities mixed in the liquid, and then sprays out through the bubble generator 33 at the bottom to form a fluid containing a large number of bubbles, which is sprayed out through the liquid outlet hole 122, and finally further pressurized through the liquid outlet channel 14 with a narrowed inner diameter, forming a high-speed bubble jet, which impacts the tube wall, cleans the viscous oil, corrosive scale, etc.

[0085] Reference Figure 1 In order to further increase the pressure of the fluid ejected from the liquid outlet channel 14, the inner diameter of the liquid outlet channel 14 needs to be smaller than the inner diameter of the liquid inlet channel 13. In an optional embodiment, an aperture adjustment component 60 is provided at the lower end of the pipe cleaner body 10, and the aperture adjustment component 60 is located at the lower side of the liquid outlet channel 14. The aperture adjustment component 60 includes an adjustment sleeve 61 and an adjustment rod 62. The adjustment sleeve 61 is embedded in the pipe cleaner body 10 and is located at the lower side of the liquid outlet channel 14. The adjustment sleeve 61 is specifically made of an elastic material, preferably a rubber or resin material. The adjustment rod 62 is located at the bottom of the adjustment sleeve 61. The adjustment rod 62 can move upward along the axial direction of the pipe cleaner body 10 to support the adjustment sleeve 61 and push the adjustment sleeve 61 to deform, thereby reducing the inner diameter of the liquid outlet channel 14; otherwise, the liquid outlet channel 14 is expanded. At the same time, when the adjustment rod 62 pushes the adjustment sleeve 61 to deform, the direction of the liquid outlet channel 14 can also change. Thus, the size and direction of the liquid outlet channel 14 can be controlled by the adjusting sleeve 61 and the adjusting rod 62 to increase the pressure of the fluid, and at the same time, the fluid can be ejected from the liquid outlet channel in multiple directions and angles to achieve the best jet impact effect.

[0086] Reference Figure 1In an optional embodiment, the aperture adjustment assembly 60 further includes a guide cone 63, the top of the guide cone 63 abuts against the bottom of the adjustment rod 62, and the guide cone 63 is also threadedly connected to the inner wall of the pipe cleaner body 10. The guide cone 63 can move upward and push the adjustment rod 62 and the adjustment sleeve 61 to move upward so that the inner diameter of the liquid outlet channel 14 is reduced. In this embodiment, the adjustment rod 62 is embedded between the guide cone 63 and the adjustment sleeve 61, that is, when installing, the adjustment rod 62 is first slid into the pipe cleaner body 10, and then the guide cone 63 is rotated to abut. On the one hand, the guide cone 63 can seal the adjustment sleeve 61 and the adjustment rod 62, and on the other hand, the lower end of the guide cone 63 is conical, which can reduce the resistance encountered by the pipe cleaner body 10 during the downward movement.

[0087] Furthermore, since underground pipelines are often in complex and changeable situations, in order to make the pipe cleaner suitable for cleaning work of different pipelines, in an optional embodiment, reference is made to Figure 1 The downhole electric high-pressure jet pipe cleaner also includes a sealing mechanism 70. The sealing mechanism 70 is arranged at the side wall of the pipe cleaner body 10. The sealing mechanism 70 includes a sealing sleeve 71, a sliding sleeve 72, and a driving source 73 arranged in the pipe cleaner body 10. It should be noted that the driving source 73 can be further connected to the driving member 31, and the driving member 31 has a special stainless steel pipe for passing the wire to achieve circuit communication with the driving source 73. Therefore, the operation of the sealing mechanism 70 can be controlled on the ground through the cable 40.

[0088] In this embodiment, it can be, referring to Figure 1 The driving source 73 is also a motor, and the motor output shaft is connected to a bidirectional screw (not marked in the figure), which is arranged axially along the main body of the pipe cleaner. There are two sliding sleeves 72, and both sliding sleeves 72 are arranged on the bidirectional screw and can move axially along the bidirectional screw. That is, when the driving source 73 rotates forward, the two sliding sleeves 72 approach each other; when the driving source 73 rotates reversely, the two sliding sleeves 72 move away from each other. There is one sealing sleeve 71, which is arranged axially along the main body of the pipe cleaner 10, and the two sliding sleeves 72 are respectively connected to the upper and lower movable ends of the sealing sleeve 71.

[0089] In an optional embodiment, the sealing sleeve 71 may be preferably spring steel, and other elastic materials such as sealing rubber may be selected in other embodiments, that is, the sealing sleeve 71 can be deformed and expanded under the extrusion of both ends. Therefore, when the driving source 73 rotates forward to drive the two sliding sleeves 72 to approach each other, it can drive the upper and lower ends of the sealing sleeve 71 to approach each other, so that the sealing sleeve 71 is squeezed and expanded, and the outer diameter of the pipe cleaner increases; conversely, when the two sliding sleeves 72 move away from each other, the sealing sleeve 71 is stretched and retracted back, and the outer diameter of the pipe cleaner decreases. Specifically, the outer diameter of the sealing sleeve 71 varies in the range of 42mm to 65mm, that is, the maximum extruded outer diameter can reach 65mm, and when the sealing sleeve 71 is stretched and restored, the outer diameter is at least 42mm, and the pipe cleaner is unsealed. Therefore, by controlling the forward or reverse rotation of the driving source 73 on the ground, the two sliding sleeves 72 are moved closer or farther away from each other, and then the overall outer diameter of the pipe cleaner body 10 is adjusted to adapt to the changing pipelines underground and improve the application range of the pipe cleaner.

[0090] It should be noted that in other embodiments, the number of the sliding sleeve 72 may also be one. That is, one end of the setting sleeve 71 is fixedly connected to the outer wall of the pipe cleaner body 10, and the other end is connected to the sliding sleeve 72, and the sliding sleeve 72 is arranged on a rotating screw connected to the driving source 73. The driving source 73 can drive the sliding sleeve 72 to move axially along the pipe cleaner body 10. Since the other end of the setting sleeve 71 is fixed to the pipe cleaner body 10, when the sliding sleeve 72 moves axially, the setting sleeve 71 as a whole can also be squeezed and expanded or stretched and restored.

[0091] In a second aspect, the present application also discloses a method for cleaning a downhole injection string, using the downhole electric high-pressure jet pipe as described in the first aspect. The method comprises:

[0092] S101. Connect the electric high-pressure jet conduit to the cable 40 on the ground;

[0093] S102. Lower the electric high-pressure jet pipe into the downhole injection string;

[0094] S103. Water is injected from the wellhead, and the water flows from the inlet channel 13 into the pressurization chamber 12;

[0095] S104. The driving member 31 is started on the ground through the cable 40 and drives the whipping member 32 to rotate to increase the water flow speed and water flow pressure;

[0096] S105. Water is ejected at high speed from the liquid outlet channel 14 to clean the wall of the downhole injection string.

[0097] In step S101 , after the cable 40 is connected to the driving member 31 , the mushroom head 21 is tightened so that the conical tube 22 is tightened inward to hold the cable 40 , thereby fixing and sealing the cable 40 .

[0098] Furthermore, in step S102, after the electric high-pressure jet pipe is lowered into the downhole injection string, when it reaches a resistance position, the sealing mechanism 70 can be controlled to seal the oil pipe, and then water injection can be carried out.

[0099] In summary, when the high-pressure jet pipe cleaner in the present application is used, the pipe cleaner is first connected to the cable 40 on the ground and then lowered into the injection column. When it reaches the obstruction position, the cable is controlled on the ground to drive the driving source 73 to drive the seat sleeve 71 to expand and block the oil pipe. Then water is injected from the wellhead, and the water flows into the booster chamber 12 through the liquid inlet 121. At this time, the ground controls the driving part 31 to rotate, and the magnetic induction component 50 drives the whipping part 32 to rotate at high speed to increase the pressure and water flow speed. After passing through the bubble generator 33, a high-speed bubble jet is formed, which is ejected at high speed from the liquid outlet channel 14. The energy generated by the bubble explosion and the dual effect of the water flow impact remove the sticky oil and scale on the pipe wall, so as to achieve the purpose of cleaning the pipe wall and reducing the probability of encountering obstruction during measurement and adjustment.

[0100] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", as explained by "including" used as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A downhole electric high-pressure jet pipe, characterized in that: It comprises a pipe cleaner body (10) and a pressure boosting assembly (30); The pipe cleaner body (10) is provided with a cable connection area (11) and a pressure chamber (12) in sequence from top to bottom; The pipe cleaner body (10) is provided with a liquid inlet channel (13) and a liquid outlet channel (14) which are in communication with the pressurizing chamber (12); the liquid inlet channel (13) is located on the upper side of the pressurizing chamber (12), and the liquid outlet channel (14) is located on the lower side of the pressurizing chamber (12); The pressurizing component (30) comprises a driving member (31), a whipping member (32) and a bubble generator (33); The driving member (31) is located in the cable connection area (11) and can be connected to the cable (40); The whipping element (32) and the bubble generator (33) are both located in the pressurizing chamber (12); The driving member (31) is used to drive the whipping member (32) to break up the liquid entering the pipe cleaner body (10); The bubble generator (32) is arranged at the bottom of the pressurizing chamber (12) and is used to generate bubbles.

2. The downhole electric high-pressure jet pipe according to claim 1, characterized in that: Also included is a magnetic induction component (50); The magnetic induction component (50) is arranged between the driving member (31) and the whipping member (32) so that the whipping member (32) can rotate under the drive of the driving member (31).

3. The downhole electric high-pressure jet pipe according to claim 2, characterized in that: The magnetic induction component (50) comprises a first magnetic suspension rotor (51) and a second magnetic suspension rotor (52) which are arranged opposite to each other; The first magnetic suspension rotor (51) is located in the cable connection area (11) and is connected to the driving member (31); The second magnetic suspension rotor (52) is located in the boosting chamber (12) and is connected to the whipping element (31); The driving member (31) is capable of driving the first magnetic suspension rotor (51) to rotate, thereby driving the second magnetic suspension rotor (52) and the whipping member (31) to rotate.

4. The downhole electric high-pressure jet pipe according to claim 1, characterized in that: The whipping element (31) is a screw pump.

5. The downhole electric high-pressure jet pipe according to claim 1, characterized in that: The inner diameter of the liquid inlet channel (13) is greater than the inner diameter of the liquid outlet channel (14).

6. The underground electric high-pressure jet pipe according to claim 1, characterized in that: It also comprises an aperture adjustment component (60), which is arranged at the lower side of the liquid outlet channel (14) and is used to adjust the inner diameter of the liquid outlet channel (14).

7. The downhole electric high-pressure jet pipe according to claim 6, characterized in that: The aperture adjustment assembly (60) comprises an adjustment sleeve (61) and an adjustment rod (62); The adjusting sleeve (61) is embedded in the pipe cleaner body (10) and is located at the lower side of the liquid outlet channel (14); The adjusting sleeve (61) is made of elastic material; The adjusting rod (62) is located at the bottom of the adjusting sleeve (61); The adjusting rod can move upward and push the adjusting sleeve (61) to deform, so that the inner diameter of the liquid outlet channel (14) is reduced.

8. The downhole electric high-pressure jet pipe according to claim 7, characterized in that: The aperture adjustment assembly (60) further comprises a guide cone (63); The guide cone (63) is located at the bottom of the adjusting rod (62) and is threadedly connected to the pipe cleaner body (10); The guide cone (63) is capable of moving upward and pushing the adjustment rod (62) and the adjustment sleeve (61) to move upward, so that the inner diameter of the liquid outlet channel (14) is reduced.

9. The downhole electric high-pressure jet pipe according to claim 1, characterized in that: Also included is a cable connection sealing assembly (20); The cable connection sealing assembly (20) is arranged at the upper end of the pipe cleaner body (10) and is used to fix and seal the cable (40).

10. The downhole electric high-pressure jet pipe according to claim 9, characterized in that: The cable connection sealing assembly (20) comprises a mushroom head (21) and a tapered tube (22); The mushroom head (21) is threadedly connected to the pipe cleaner body (10), and the tapered tube (22) is located at the lower side of the mushroom head (21); The mushroom head (21) and the conical tube (22) are both hollow so as to allow the cable (40) to pass through; The lower end of the conical tube (22) is in a petal shape; The mushroom head (21) can move downward and press the lower end of the conical tube (22) inward, so that the lower end of the conical tube (22) is tightened inward and holds the cable (40).

11. The downhole electric high-pressure jet pipe according to claim 10, characterized in that: The outer diameter of the tapered tube (22) gradually increases from top to bottom, and the inner diameter of the mushroom head (21) gradually decreases from top to bottom.

12. The downhole electric high-pressure jet pipe according to claim 10, characterized in that: A salvaging groove (211) is milled on the outer side wall of the mushroom head (21).

13. The downhole electric high-pressure jet pipe according to claim 1, characterized in that: Also includes a setting mechanism (70); The sealing mechanism (70) is arranged on the side wall of the pipe cleaner body (10) and is used to seal the pipe cleaner body (10) and unseal the pipe cleaner body (10).

14. The downhole electric high-pressure jet pipe according to claim 13, characterized in that: The setting mechanism (70) comprises a setting sleeve (71) and a sliding sleeve (72); The setting sleeve (71) and the sliding sleeve (72) are both arranged axially along the pipe clearing device body (10); The number of the sliding sleeves (72) is two, and the two sliding sleeves (72) are respectively connected to the upper and lower ends of the setting sleeve (71); The two sliding sleeves (72) can move closer to or farther from each other, so that the setting sleeve (71) can be squeezed and expanded or stretched and restored.

15. The downhole electric high-pressure jet pipe according to claim 14, characterized in that: The setting mechanism (70) further includes a driving source (73); The driving source (73) is arranged in the pipe clearing device body (10) and is used to drive the two sliding sleeves (72) to move closer to or farther from each other.

16. A method for cleaning a downhole injection string, using the downhole electric high-pressure jet pipe device according to any one of claims 1 to 15, characterized in that: include: Connecting an electric high-pressure jet conduit to a cable (40) on the ground; Lower the electric high-pressure jet pipe into the downhole injection string; Water is injected from the wellhead, and the water flows into the pressure-boosting chamber (12) through the liquid inlet channel (13); The driving member (31) is started on the ground through the cable (40) to drive the whipping member (32) to rotate, so as to increase the water flow speed and water flow pressure; The water flow is ejected at high speed from the liquid outlet channel (14) to clean the wall of the downhole injection pipe string.

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