Oil well shaft repairing device and oil well shaft repairing equipment

Abstract

The invention relates to the technical field of oil well shaft repairing, in particular to an oil well shaft repairing device and oil well shaft repairing equipment. Wherein the coating device shell is arranged on the circumferential outer side of the coating component in a sleeving mode, and heating components distributed in the axial direction of the coating device shell at intervals and a containing cavity used for containing a repairing material are further arranged in the coating device shell; the coating component is connected to the driving mechanism so as to be driven by the driving mechanism to reciprocate in the axial direction of the coating device shell; a guide channel used for applying a repairing material to the damaged part of the oil well shaft is arranged in the coating component, and the guide channel is arranged to be communicated with or disconnected from the containing cavity based on driving of the driving mechanism; the heating component is arranged to be capable of heating the repairing material entering the guiding channel so that the repairing material which flows into the guiding channel from the containing cavity and flows out of the guiding channel can be coated on the damaged portion of the oil well shaft in a molten state. The oil well shaft repairing device can simplify the repairing process of the damaged part of the oil well shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of oil well borehole repair, and particularly to an oil well borehole repair device and an oil well borehole repair equipment. Background Art

[0002] At the end stage of oil and gas well exploitation, due to various reasons, the oil well borehole is damaged. The existing traditional treatment method is to squeeze cement into the damaged part of the oil well borehole for plugging. In this method, a cement supply device installed on the ground and used for supplying cement, a cement conveying device extending from the ground to the oil well borehole, and a pressurizing device for enabling the cement to be smoothly extruded from the conveying device are required. Therefore, the traditional repair process requires the use of many large-scale devices, and the repair process requires the cooperation of devices located on the ground and devices located in the oil well borehole in multiple links, and the repair process is complex. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problem of the complex process of repairing the damage of the oil well borehole existing in the prior art.

[0004] To achieve the above purpose, on the one hand, the present invention provides an oil well borehole repair device, which includes a driving mechanism and a coating mechanism. The coating mechanism includes a coating device housing and a coating component. The coating device housing is sleeved on the circumferential outer side of the coating component. The coating device housing further is provided with heating components and an accommodating cavity for accommodating repair materials, which are distributed at intervals along its axial direction; the coating component is connected to the driving mechanism and is driven by the driving mechanism to reciprocate along the axial direction of the coating device housing; a guiding channel for applying the repair material to the damaged part of the oil well borehole is provided in the coating component, and the guiding channel is set to be communicated or disconnected from the accommodating cavity based on the driving of the driving mechanism; the heating component is set to be able to heat the repair material entering the guiding channel, so that the repair material flowing from the accommodating cavity into the guiding channel and flowing out of the guiding channel is coated on the damaged part of the oil well borehole in a molten state.

[0005] In some embodiments, the coating component includes a spraying nozzle and a first shaft body component; along the axial direction of the coating device housing, the head end of the first shaft body component is connected to the driving mechanism, the head end of the spraying nozzle is connected to the tail end of the first shaft body component, and the spraying nozzle and the first shaft body component are driven by the driving mechanism to reciprocate along the axial direction of the coating device housing; a nozzle channel for applying the repair material to the damaged part of the oil well borehole is provided in the spraying nozzle, a shaft body channel communicated with the nozzle channel is provided in the first shaft body component, and the nozzle channel and the shaft body channel define the guiding channel; based on the driving of the driving mechanism, the nozzle channel is communicated or disconnected from the accommodating cavity through the shaft body channel.

[0006] In some embodiments, the accommodation cavity is circumferentially arranged around the first shaft member; a plurality of feed ports are circumferentially and spaced apart from each other on the radial side wall of the first shaft member, and the feed ports communicate with the nozzle channel through the shaft channel; based on the drive of the drive mechanism, the feed port moving with the first shaft member communicates with or disconnects from the accommodation cavity.

[0007] In some embodiments, the coating mechanism further includes a second shaft member; along the axial direction of the coater housing, the end of the second shaft member is connected to the head end of the first shaft member through a spline structure, and the first shaft member passes through the end wall of the end of the coater housing; the outer radial surface of the first shaft member is threadedly connected to the end wall; the drive mechanism includes a rotary motor mechanism and a power transmission mechanism, and the motor shaft of the rotary motor mechanism is fixedly connected to the head end of the first shaft member; the power transmission mechanism can transmit the power of the cable to the power connection structure of the rotary motor mechanism; based on the rotation of the shaft of the rotary motor mechanism, the first shaft member rotates into or out of the coater housing, and correspondingly, the feed port communicates with or disconnects from the accommodation cavity.

[0008] In some embodiments, the power transmission mechanism is a hose coupling mechanism, the power connection structure of the rotary motor mechanism is connected to the output end of the power transmission structure of the hose coupling mechanism, and the input end of the power transmission structure of the hose coupling mechanism is used for connecting with the cable.

[0009] In some embodiments, a first heat insulation plate is provided between the accommodation cavity and the rotary motor mechanism, the second shaft member passes through the first heat insulation plate, and a first sealing ring is circumferentially arranged between the first heat insulation plate and the coater housing.

[0010] In some embodiments, the nozzle channel has a nozzle outlet section for the outflow of the repair material, and an anti-backflow structure is provided in the nozzle outlet section.

[0011] In some embodiments, the anti-backflow structure includes a plurality of anti-backflow components circumferentially and spaced apart from each other along the nozzle outlet section; the anti-backflow component has a fixed end and a free end, the fixed end of the anti-backflow component is fixedly connected to the inner radial wall of the nozzle outlet section, and the free end of the anti-backflow component is spaced apart from the inner radial wall of the nozzle outlet section; along the direction from the inlet of the nozzle outlet section to the outlet of the nozzle outlet section, the anti-backflow component extends obliquely from the fixed end to the free end towards the outlet of the nozzle outlet section.

[0012] In some embodiments, a second heat insulation plate is provided between the heating component and the accommodation cavity, the first shaft member passes through the second heat insulation plate, and a second sealing ring is circumferentially arranged between the second heat insulation plate and the coater housing.

[0013] In some embodiments, the heating component is a plurality of interconnected heating sheets, all the heating sheets are circumferentially arranged around the first shaft member, and the heating sheets can be connected to the cable.

[0014] On the other hand, the present invention provides an oil well shaft repair device, which includes a control mechanism and the above-mentioned oil well shaft repair device. The control mechanism can be arranged on the ground and is used to control the opening and shutting down of the oil well shaft repair device.

[0015] The technical solution of the present invention has the following beneficial effects:

[0016] The driving mechanism drives the coating component to move, so that the guiding channel communicates with the accommodating cavity, and then the repair material enters the guiding channel. And the repair material entering the guiding channel will be heated by the heating component into a molten state, and the molten state repair material flowing out of the guiding channel will be coated on the damaged part of the oil well shaft; after the damaged part of the oil well shaft is repaired, the driving mechanism drives the coating component to move, so that the guiding channel is disconnected from the accommodating cavity. Therefore, only by controlling the driving device can the repair of the damaged part of the oil well shaft be completed, without using too many large-scale devices, and the oil well shaft repair device can simplify the repair process of the damaged part of the oil well shaft. Description of the Drawings

[0017] Figure 1 is a cross-sectional schematic view of the oil well shaft repair device in an embodiment of the present invention;

[0018] Figure 2 is Figure 1 a partial enlarged schematic view of part A in

[0019] Figure 3 is a connection schematic view of the first shaft body component and the spraying nozzle in an embodiment of the present invention;

[0020] Figure 4 is a cross-sectional schematic view of the spraying nozzle in an embodiment of the present invention;

[0021] Figure 5 is a working schematic view of the oil well shaft repair device in an embodiment of the present invention.

[0022] Description of the Reference Numerals

[0023] 1. Driving mechanism; 11. Rotary motor mechanism; 111. Motor mounting housing; 112. Motor rotating shaft; 113. Bearing component; 114. Motor connector; 12. Horsehead mechanism; 121. Horsehead housing; 122. Cable connector; 123. Circuit connection shaft; 124. Motor connector; 2. Coating mechanism; 21. Coater housing; 211. Heating component; 212. Accommodation cavity; 213. End shell wall; 214. First heat insulation plate; 2141. First sealing ring; 215. Second heat insulation plate; 2151. Second sealing ring; 22. Coating component; 221. Guiding channel; 222. First shaft body component; 2221. Shaft body channel; 2222. Feed inlet; 2223. Spline; 223. Spraying nozzle; 2231. Nozzle channel; 2232. Nozzle outlet section; 2233. Anti-backflow component; 23. Second shaft body component; 3. Control mechanism. Detailed implementation manners

[0024] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in combination with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention, rather than to limit the present invention. For those skilled in the art, the present invention can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

[0025] As Figure 1 and Figure 2 shown, the present invention provides an oil wellbore repair device, which includes a driving mechanism 1 and a coating mechanism 2. The coating mechanism 2 includes a coater housing 21 and a coating component 22. The coater housing 21 is sleeved on the circumferential outer side of the coating component 22. The coater housing 21 is also provided with heating components 211 spaced along its axial direction and an accommodation cavity 212 for accommodating repair materials. The coating component 22 is connected to the driving mechanism 1 and is driven by the driving mechanism 1 to reciprocate along the axial direction of the coater housing 21; a guiding channel 221 for applying repair materials to the damaged part of the oil wellbore is provided in the coating component 22, and the guiding channel 221 is configured to be communicated with or disconnected from the accommodation cavity 212 based on the driving of the driving mechanism 1; the heating component 211 is configured to be able to heat the repair materials entering the guiding channel 221, so that the repair materials flowing from the accommodation cavity 212 into the guiding channel 221 and flowing out of the guiding channel 221 are coated on the damaged part of the oil wellbore in a molten state.

[0026] Specifically, the oil well shaft repair device is installed near the damaged part of the oil well shaft, and then the repair of the damaged part of the oil well shaft is started. In the initial state, the coating component 22 is not connected or is disconnected from the accommodating cavity 212, and the repair material in the accommodating cavity 212 cannot enter the guiding channel 221. When the oil well shaft repair device enters the working state, driven by the driving mechanism 1, the inlet of the guiding channel 221 of the coating component 22 moves towards the accommodating cavity 212, and then the guiding channel 221 of the coating component 22 is connected to the accommodating cavity 212, and the repair material in the accommodating cavity 212 can enter the guiding channel 221. Moreover, when the oil well shaft repair device enters the working state, the heating component 211 can heat the guiding channel 221, and the repair material entering the guiding channel 221 becomes in a molten state, and gas is generated during the process of the repair material becoming in a molten state. The gas accumulates in the guiding channel 221 and the accommodating cavity 212. Under the action of the gravity of the molten state repair material itself and the gas pressure, the molten state repair material flows along the guiding channel 221 towards the damaged part of the oil well shaft. When the repair of the damaged part of the oil well shaft is completed, the driving mechanism 1 drives the inlet of the guiding channel 221 of the coating component 22 to move away from the accommodating cavity 212, so that the guiding channel 221 is disconnected from the accommodating cavity 212, and the repair material cannot enter the guiding channel 221. Preferably, the repair material is a conventional iron-based alloy powder or particles in the art.

[0027] In this embodiment, the driving mechanism 1 is driven to drive the coating component 22 to move, so that the guiding channel 221 is connected to the accommodating cavity 212, and then the repair material enters the guiding channel 221, and the repair material entering the guiding channel 221 will be heated to a molten state by the heating component 211, and the molten state repair material flowing out of the guiding channel 221 will be coated on the damaged part of the oil well shaft; after the repair of the damaged part of the oil well shaft is completed, the driving mechanism drives the coating component 22 to move, so that the guiding channel 221 is disconnected from the accommodating cavity 212. Therefore, only by controlling the driving device can the repair of the damaged part of the oil well shaft be completed, without using too many large-scale devices, and the oil well shaft repair device can simplify the repair process of the damaged part of the oil well shaft. Moreover, the repair material coated on the damaged part of the oil well shaft forms a dense metal coating layer, which has good sealing performance and can effectively improve the plugging effect on the damaged part of the oil well shaft, avoiding the internal part of the oil well shaft from communicating with the outside through the damaged part of the oil well shaft.

[0028] It should be noted that the driving mechanism 1 can be a conventional device in the art, and the present invention will not elaborate on its structure and principle.

[0029] Such as Figures 1 to 4As shown, in some embodiments of the present invention, the coating member 22 includes a spraying nozzle 223 and a first shaft member 222; along the axial direction of the coater housing 21, the leading end of the first shaft member 222 is connected to the driving mechanism 1, the leading end of the spraying nozzle 223 is connected to the trailing end of the first shaft member 222, and the spraying nozzle 223 and the first shaft member 222 are driven by the driving mechanism 1 to reciprocate axially along the coater housing 21; a nozzle channel 2231 for applying a repair material to the damaged part of the oil wellbore is provided in the spraying nozzle 223, a shaft channel 2221 communicating with the nozzle channel 2231 is provided in the first shaft member 222, and the nozzle channel 2231 and the shaft channel 2221 define a guiding channel 221; based on the driving of the driving mechanism 1, the nozzle channel 2231 is communicated with or disconnected from the accommodating cavity 212 through the shaft channel 2221.

[0030] Specifically, the spraying nozzle 223 and the first shaft member 222 may be integrally formed and connected components, or two independent components connected together, which is not limited in the present invention. Along the flow direction of the repair material, the spraying nozzle 223 is arranged downstream of the first shaft member 222. The nozzle channel 2231 and the shaft channel 2221 are connected, and the two together constitute the guiding channel 221. The diameter of the nozzle channel 2231 may be the same as that of the shaft channel 2221 to enable the smooth flow of the repair material. The diameter of the nozzle channel 2231 may also be slightly smaller than that of the shaft channel 2221, which can not only ensure that the repair material can smoothly enter the shaft channel 2221, but also limit the outflow speed and flow rate of the repair material to optimize the coating effect. Preferably, the end section of the nozzle channel 2231 for facing the oil wellbore may be set to extend horizontally, that is, the axial direction of the end section of the nozzle channel 2231 is perpendicular to the axial direction of the first shaft member 222, that is, the axial direction of the end section of the nozzle channel 2231 extends along the radial direction of the first shaft member 222, so that the damaged part of the oil wellbore can be vertically faced from the end section of the nozzle channel 2231. The shaft channel 2221 includes a shaft channel inlet and a shaft channel outlet. The shaft channel inlet is located on the radial side wall of the first shaft member 222, or the shaft channel inlet is located on the end face of the first shaft member 222 facing the driving mechanism 1, which is not limited in the present invention. The shaft channel outlet is communicated with the inlet of the nozzle channel, and the repair material flows out from the nozzle channel outlet and is coated on the damaged position of the oil wellbore.

[0031] In this embodiment, when the driving mechanism 1 drives the spraying nozzle 223 and the first shaft member 222 to move forward, the inlet of the shaft channel 2221 moves from a position isolated from the accommodating cavity 212 to a position where it can communicate with the accommodating cavity 212, so that the shaft channel 2221 communicates with the accommodating cavity 212, and further the nozzle channel 2231 communicates with the accommodating cavity 212. The repair material in the accommodating cavity 212 can flow along the shaft channel 2221 and the nozzle channel 2231 in sequence to the damaged part of the oil well shaft. The heating member 211 can heat the repair material in the shaft channel 2221, so the repair material entering the shaft channel 2221 will be heated to a molten state, and finally the repair material flows out of the nozzle channel 2231 in a molten state and is coated on the damaged part of the oil well shaft. When the driving motor drives the spraying nozzle 223 and the first shaft member 222 to move backward, the inlet of the shaft channel 2221 moves from a position communicating with the accommodating cavity 212 to a position isolated from the accommodating cavity 212, so that the connection between the nozzle channel 2231 and the accommodating cavity 212 is disconnected, and the repair material stops entering the nozzle channel 2231, and the repair of the damaged part of the oil well shaft stops.

[0032] In some embodiments, in the initial state, the spraying nozzle 223 is located outside the coating device housing 21, and the first shaft member 222 axially and circumferentially passes through the end of the coating device housing 21 along the axis. And a conventional limiting structure in the art can also be provided between the first shaft member 222 and the coating device housing 21 to prevent the disconnection between the first shaft member 222 and the coating device housing 21 or between the first shaft member 222 and the driving mechanism 1. For example, the first shaft member 222 and the coating device housing 21 are connected by a plurality of tension springs. The head end of the tension spring is connected to the inner wall of the coating device housing 21, and the tail end of the tension spring is connected to the first shaft member 222, and the position of the head end of the tension spring is higher than the position of the tail end of the tension spring; when the shaft channel 2221 is isolated from the accommodating cavity 212, the tension spring is in a tension state; when the shaft channel 2221 communicates with the accommodating cavity 212, the tension spring contracts and the amount of deformation decreases. Of course, the limiting structure can also be other structural forms, and the present invention does not make a limitation. In this embodiment, the driving mechanism 1 can include an electric push rod capable of reciprocating the first shaft member 222 along the axis of the coating device housing 21.

[0033] In some embodiments, the coating member 22 can include a plurality of spraying nozzles 223 distributed at intervals in the circumferential direction to expand the coating range.

[0034] Such as Figure 1As shown, in some embodiments of the present invention, the accommodation cavity 212 is circumferentially arranged around the first shaft member 222; a plurality of circumferentially spaced feed ports 2222 are provided on the radial side wall of the first shaft member 222, and the feed ports 2222 communicate with the nozzle channel 2231 through the shaft channel 2221; based on the drive of the drive mechanism 1, the feed ports 2222 that move with the first shaft member 222 communicate or disconnect from the accommodation cavity 212.

[0035] Specifically, the accommodation cavity 212 is arranged as a cylindrical space, a cuboid space or a spherical space, etc., and the present invention does not limit it. The first shaft member 222 passes through the accommodation cavity 212 along the axis of the coater housing 21 and is connected to the drive mechanism 1. So when the accommodation cavity 212 is filled with the repair material, the repair material surrounds the first shaft member 222. The feed ports 2222 communicate with the nozzle channel 2231 through the shaft channel 2221.

[0036] In this embodiment, when the drive mechanism 1 drives the spray nozzle 223 and the first shaft member 222 to move forward, the feed ports 2222 move from a position isolated from the accommodation cavity 212 to a position where they can communicate with the accommodation cavity 212, so that the shaft channel 2221 communicates with the accommodation cavity 212, and further the nozzle channel 2231 communicates with the accommodation cavity 212. The repair material in the accommodation cavity 212 can flow along each feed port 2222 into the shaft channel 2221 and the nozzle channel 2231. These feed ports 2222 can increase the flow rate of the repair material, so that there is enough repair material in the shaft channel 2221, and even if some of the feed ports 2222 are blocked, the repair material can still enter the shaft channel 2221 through other feed ports 2222.

[0037] In some embodiments, the feed ports 2222 are arranged as long port structures whose length directions extend along the axis of the first shaft member 222, so that the area of the feed ports 2222 communicating with the accommodation cavity 212 can be adjusted, thereby controlling the flow rate of the repair material. For example, when the drive mechanism 1 drives the spray nozzle 223 and the first shaft member 222 to move forward, the feed ports 2222 move from a position isolated from the accommodation cavity 212 to a position where they can communicate with the accommodation cavity 212, and as the area of the feed ports 2222 communicating with the accommodation cavity 212 gradually expands, more repair material can enter the shaft channel 2221 for heating; when the drive mechanism 1 drives the spray nozzle 223 and the first shaft member 222 to move backward, the area of the feed ports 2222 communicating with the accommodation cavity 212 gradually shrinks, reducing the amount of repair material entering the shaft channel 2221. Of course, the feed ports 2222 can also be arranged as elliptical structures whose major axis directions extend along the axis of the first shaft member 222, and the present invention does not limit it.

[0038] Such as Figure 1and Figure 2 As shown, in some embodiments of the present invention, the coating mechanism 2 further includes a second shaft member 23; along the axial direction of the coating device housing 21, the end of the second shaft member 23 is connected to the head end of the first shaft member 222 through a spline structure, and the first shaft member 222 passes through the end wall 213 at the end of the coating device housing 21; the radially outer side of the first shaft member 222 is threadedly connected to the end wall 213; the driving mechanism 1 includes a rotating motor mechanism 11 and a power transmission mechanism, the motor rotating shaft of the rotating motor mechanism 11 is fixedly connected to the head end of the first shaft member 222; the power transmission mechanism can transmit the power of the cable to the power connection structure of the rotating motor mechanism 11; based on the rotation of the rotating shaft of the rotating motor mechanism 11, the first shaft member 222 makes a movement of screwing into or out of the coating device housing 21, and correspondingly makes the feed port 2222 communicate or disconnect from the accommodating cavity 212.

[0039] Specifically, the cable can be connected to the power connection structure of the rotary motor mechanism 11 through the power transmission mechanism, so that the cable can supply power to the rotary motor mechanism 11. The motor rotor of the rotary motor mechanism 11 drives the motor rotating shaft 112 of the rotary motor mechanism 11 to rotate circumferentially, and further drives the second shaft body component 23 to rotate circumferentially. The first end of the second shaft body component 23 can be fixedly connected to the motor rotating shaft 112 of the rotary motor mechanism 11 through a threaded structure or an interference fit structure. Preferably, the motor rotating shaft 112 of the rotary motor mechanism 11 has a rotating shaft connection portion, and the rotating shaft connection portion and the power connection structure of the rotary motor mechanism 11 are arranged at intervals along the axial direction of the coater housing 21; the rotating shaft connection portion faces the first shaft body component 222, and the rotating shaft connection portion is fixedly connected to the first end of the second shaft body component 23; the power connection structure of the rotary motor mechanism 11 faces away from the first shaft body component 222, and the power connection structure of the rotary motor mechanism 11 is connected to the power transmission mechanism. The first end of the coater housing 21 faces the rotary motor mechanism 11, and the first end of the coater housing 21 is fixedly connected to the rotary motor mechanism 11. The end of the coater housing 21 faces away from the rotary motor mechanism 11, and the end of the coater housing 21 has an end shell wall 213 opposite to the rotary motor mechanism 11; or rather, the radial direction of the end shell wall 213 is the same as the radial direction of the coater housing 21. The radially outer portion of the end shell wall 213 is fixedly connected to the radial side wall of the coater housing 21. Along the thickness direction of the end shell wall 213, or along the axial direction of the coater housing 21, an installation hole penetrating the end shell wall 213 is provided on the end shell wall 213, and internal threads are provided on the side wall of the installation hole. The first shaft body component 222 axially penetrates the installation hole along the coater housing 21, and external threads are provided on the radially outer side wall of the first shaft body component 222. The internal threads of the installation hole can be threadedly engaged with the external threads of the first shaft body component 222, so that the first shaft body component 222 can be screwed into or out of the coater housing 21 along the installation hole. Of course, during the process of the first shaft body component 222 being screwed into or out of the coater housing 21 along the installation hole, the connection between the first shaft body component 222 and the second shaft body component 23 is not disengaged, so that the rotary motor mechanism 11 can always control the movement of the first shaft body component 222. In addition, the length of the spline groove should be set to be relatively long to allow the first shaft body component 222 to reciprocate along the spline groove.

[0040] In this embodiment, when the rotary motor mechanism 11 rotates forward, the first shaft body component 222 screws into the interior of the applicator housing 21, and at the same time, the spray nozzle 223 moves toward the rotary motor mechanism 11 (i.e., moves forward); the feed port 2222 moves from a position isolated from the accommodation cavity 212 to a position where it can communicate with the accommodation cavity 212, so that the shaft body channel 2221 communicates with the accommodation cavity 212, and further the nozzle channel 2231 communicates with the accommodation cavity 212, and the repair material in the accommodation cavity 212 can flow along each feed port 2222 to the shaft body channel 2221 and the nozzle channel 2231. And because the accommodation cavity 212 is arranged around the first shaft body component 222, and the feed ports 2222 are circumferentially distributed on the radial side wall of the first shaft body component 222, during the rotation of the first shaft body component 222, the feed ports 2222 can always communicate with the accommodation cavity 212, so that the repair material can continuously enter the shaft body channel 2221.

[0041] It should be noted that the power transmission mechanism is a conventional power transmission device in the art, and the structure and principle thereof will not be elaborated in the present invention.

[0042] Similarly, it should be noted that the rotary motor mechanism 11 can be a conventional motor mechanism in the art. For example, the rotary motor mechanism 11 can be selected as the motor mechanism applied in an underground pulse generator. Of course, the rotary motor mechanism 11 can also be any other motor mechanism that can achieve the above technical effects. However, for the convenience of understanding the present invention, the rotary motor mechanism 11 is simply exemplified in this embodiment. In some embodiments, the rotary motor mechanism 11 includes a motor mounting housing 111, a motor rotor structure, a motor stator structure, a bearing component 113, a rotor spindle connector, and a motor connector 114 as a power connection structure, etc. The motor stator structure further includes a stator coil (or stator winding), etc., and the motor rotor structure includes a motor rotor and a motor rotating shaft 112, etc. The bearing component 113 is fixedly installed in the motor mounting housing 111, and the axes of both the bearing component 113 and the motor mounting housing 111 are the same as the axis of the applicator housing 21. The rotor spindle connector is installed on the radial inner side of the bearing component 113. The head end of the rotor spindle connector is connected to the tail end of the motor connector 114. The head end of the motor connector 114 is connected to the power transmission mechanism. The tail end of the rotor spindle connector is connected to the head end of the motor rotating shaft 112. The tail end of the motor rotating shaft 112 is connected to the head end of the second shaft body component 23. When the cable supplies power to the motor connector 114, a rotating magnetic field is generated at the motor stator structure, thereby driving the motor rotor to rotate. The motor rotor structure drives the motor rotating shaft 112 to rotate, and the motor rotating shaft 112 further drives the second shaft body component 23, the first shaft body component 222, and the spray nozzle 223 to rotate.

[0043] Of course, in some other embodiments, the rotary electric machine mechanism 11 may also adopt other structural forms, and the rotary electric machine mechanism 11 of the present invention is not limited to the embodiments provided by the present invention.

[0044] In some embodiments, a shaft body mounting groove is provided at the end of the second shaft body member 23, and a plurality of circumferentially spaced spline grooves are provided at the radial side wall of the shaft body mounting groove. A plurality of circumferentially distributed splines 2223 are provided on the radially outer side surface of the first end of the first shaft body member 222, and the splines 2223 correspond to the spline grooves one by one. The first end of the first shaft body member 222 is axially spaced from the bottom wall of the shaft body mounting groove along the axis of the coater housing 21. Along the axis of the coater housing 21, the length of the spline groove is greater than the length of the splines 2223, and the length of the spline groove is greater than the length of the internal thread of the mounting hole and the length of the external thread of the first shaft body member 222, so that the first shaft body member 222 can extend out of or retract into the shaft body mounting groove.

[0045] As Figure 1 shown, in some embodiments of the present invention, the power transmission mechanism is a cable head mechanism 12. The power connection structure of the rotary electric machine mechanism 11 is connected to the output end of the power transmission structure of the cable head mechanism 12, and the input end of the power transmission structure of the cable head mechanism 12 is used to connect to a cable.

[0046] It should be noted that the cable head mechanism 12 is a common power transmission device in the art. The cable head mechanism 12 has the functions of signal transmission after cable connection, steel cable connection and load bearing, and disengagement when stuck. The structure and principle of the present invention will not be described in detail. For example, the cable head mechanism 12 of the present invention can be selected as an oil-filled balanced cable head or a FYMLT-IQB type logging cable head produced by Xi'an Fangyuan Energy Engineering Co., Ltd. However, for the convenience of understanding the present invention, the cable head mechanism 12 is briefly described as follows in this embodiment.

[0047] Specifically, the bridle mechanism 12 includes a bridle housing 121. A cable connector 122, a circuit connection shaft 123, and a motor connector 124 are sleeved in the bridle housing 121. The axes of the bridle housing 121, the cable connector 122, the circuit connection shaft 123, and the motor connector 124 are along the same direction as the axis of the coater housing 21. A plurality of insulating clamping members are arranged between the inner wall of the bridle housing 121 and the circuit connection shaft 123. Preferably, the insulating clamping members are located between the end of the circuit connection shaft 123 and the inner wall of the bridle housing 121. First and second mounting grooves are respectively provided at both ends of the circuit connection shaft 123. The first and second mounting grooves are recessed from the end of the circuit connection shaft 123 towards the axial middle section of the circuit connection shaft 123. A first internal thread is provided on the radial side wall of the first mounting groove, and a second internal thread is provided on the radial side wall of the second mounting groove. A first external thread is provided on the radial outer side of the end of the cable connector 122, and the first external thread at the end of the cable connector 122 is in threaded engagement with the first internal thread of the first mounting groove. A second external thread is provided on the radial outer side of the head end of the motor connector 124, and the second external thread at the head end of the motor connector 124 is in threaded engagement with the second internal thread of the second mounting groove. The head end of the cable connector 122 is used to connect with a cable, and the head end of the motor connector 124 is connected to the power connection structure of the rotary motor mechanism 11. A cable connector is further provided at one end of the bridle housing 121 facing away from the rotary motor mechanism 11, and the cable connector is used to connect with a ground cable.

[0048] In some embodiments, the oil well borehole repair device further includes a connecting sleeve. The connecting sleeve is sleeved outside the rotary motor mechanism 11 (such as the motor mounting shell 111) and the bridle housing 121, and the radial sides of the connecting sleeve are fixedly connected (such as by threaded connection) to the radial outer sides of the motor mounting shell 111 and the bridle housing 121 respectively, so as to firmly connect the rotary motor mechanism 11 and the bridle mechanism 12.

[0049] As Figure 1 and Figure 2 As shown, in some embodiments of the present invention, a first heat insulation plate 214 is provided between the accommodation cavity 212 and the rotary motor mechanism 11. The second shaft body member 23 passes through the first heat insulation plate 214, and a first sealing ring 2141 is circumferentially provided between the first heat insulation plate 214 and the coater housing 21.

[0050] Specifically, the first heat insulation plate 214 is preferably a cylindrical plate member, and the thickness direction of the first heat insulation plate 214 is consistent with the axial direction of the coater housing 21. The radially outer side surface of the first heat insulation plate 214 is fixedly connected to the radially inner side surface of the coater housing 21. The accommodation cavity 212 and the rotary motor mechanism 11 are respectively located on both axial sides of the first heat insulation plate 214. For example, the accommodation cavity 212 is located below the first heat insulation plate 214, and the rotary motor mechanism 11 is located above the first heat insulation plate 214. In the thickness direction of the first heat insulation plate 214, a first through hole is provided on the first heat insulation plate 214, and the second shaft body member 23 passes through the first through hole. Therefore, a part of the second shaft body member 23 is located on the side of the first heat insulation plate 214 facing the rotary motor mechanism 11, and the other part of the second shaft body member 23 is located on the side of the first heat insulation plate 214 facing the accommodation cavity 212.

[0051] In this embodiment, the first heat insulation plate 214 can avoid excessive heat transfer to the rotary motor mechanism 11, thereby avoiding affecting the normal operation of the rotary motor mechanism 11. The heat generated by the heating component 211 is transferred to the accommodation cavity 212, causing a part of the repair material in the accommodation cavity 212 to become in a molten state. And gas is generated during the process of the repair material changing from a solid state to a molten state. The first sealing ring 2141 can block the pores between the first heat insulation plate 214 and the coater housing 21, preventing the gas from escaping from the pores between the first heat insulation plate 214 and the coater housing 21, so that the gas accumulates in the accommodation cavity 212 and generates pressure on the repair material, accelerating the flow of the molten repair material into the nozzle channel 2231.

[0052] In some embodiments, a first seal mounting groove is provided on the radially outer side surface of the first heat insulation plate 214, and the first sealing ring 2141 is installed in the first seal mounting groove to prevent the first sealing ring 2141 from falling off. A third seal mounting groove is provided on the side wall of the first through hole, and the third sealing ring is installed in the third seal mounting groove. That is, a third sealing ring is provided between the first heat insulation plate 214 and the second shaft body member 23, and the third seal mounting groove is used to prevent the third sealing ring from falling off. The first sealing ring 2141 and the third sealing ring can prevent the gas from escaping.

[0053] In some embodiments, the head end of the rotary electric machine mechanism 11 is connected to the tail end of the faucet mechanism 12. The tail end of the rotary electric machine mechanism 11 extends axially into the head end of the coater housing 21 along the coater housing 21, and the inner side surface of the radial side wall at the head end of the coater housing 21 is threadedly connected to the outer side surface of the radial side wall at the tail end of the motor mounting housing 111. A filling structure is provided between the first heat insulation plate 214 and the rotary electric machine mechanism 11 to prevent direct contact between the first heat insulation plate 214 and the rotary electric machine mechanism 11. The filling structure can be an isolation rack or a solid metal block, etc., and the present invention does not make any limitations. The first heat insulation plate 214 is located between the filling structure and the accommodating cavity 212.

[0054] As Figure 4 shown, in some embodiments of the present invention, the nozzle channel 2231 has a nozzle outlet section 2232 for the outflow of the repair material, and an anti-backflow structure is provided in the nozzle outlet section 2232.

[0055] Specifically, the nozzle outlet section 2232 is also the end section of the nozzle channel 2231. After flowing out of the nozzle outlet section 2232 in the repair material, it is coated on the damaged part of the oil well borehole. The anti-backflow structure can prevent the molten liquid of the repair material from flowing back.

[0056] As Figure 4 shown, in some embodiments of the present invention, the anti-backflow structure includes a plurality of anti-backflow components 2233 that are circumferentially spaced apart along the nozzle outlet section 2232; the anti-backflow components 2233 have a fixed end and a free end. The fixed end of the anti-backflow component 2233 is fixedly connected to the radial inner side wall of the nozzle outlet section 2232, and the free end of the anti-backflow component 2233 is spaced apart from the radial inner side wall of the nozzle outlet section 2232; along the direction from the inlet of the nozzle outlet section 2232 to the outlet of the nozzle outlet section 2232, the anti-backflow component 2233 extends obliquely towards the outlet of the nozzle outlet section 2232 from the fixed end to the free end.

[0057] Specifically, the fixed end of the anti-backflow component 2233 is fixedly connected to the radial inner side wall of the nozzle outlet section 2232, and the free end of the anti-backflow component 2233 extends to the radial center of the nozzle outlet section 2232. And the free ends of these anti-backflow components 2233 can be in contact with each other or spaced apart from each other by a certain distance. Along the flow direction of the repair material, the anti-backflow component 2233 extends obliquely towards the outlet of the nozzle outlet section 2232 from the fixed end to the free end.

[0058] In an embodiment, when the molten liquid of the repair material is coated on the damaged position of the oil well borehole, under the moving pressure, the molten liquid can push open the anti-backflow member 2233, causing the anti-backflow member 2233 to bend radially outward toward the nozzle outlet section 2232, increasing the aperture between the anti-backflow members 2233, and the molten liquid flows out. However, if for some reason the molten liquid flows back toward the nozzle outlet section 2232, the flowing-back molten liquid will exert a force on the anti-backflow member 2233 in the direction opposite to the flowing-out direction of the molten liquid, causing the anti-backflow members 2233 to tighten, reducing and even closing the aperture between the anti-backflow members 2233, thereby preventing the molten liquid from flowing back.

[0059] In some embodiments, multiple rows of the anti-backflow members 2233 are circumferentially spaced along the nozzle outlet section 2232, with at least two anti-backflow members 2233 in each row, to enhance the anti-backflow ability.

[0060] It should be noted that the anti-backflow structure can also adopt other structural forms, such as a gradient tooth-shaped progressive structure, etc., and the present invention does not make any limitations.

[0061] As Figure 1 and 2 shown, in some embodiments of the present invention, a second heat insulation plate 215 is provided between the heating member 211 and the accommodating cavity 212. The first shaft member 222 passes through the second heat insulation plate 215, and a second sealing ring 2151 is circumferentially provided between the second heat insulation plate 215 and the coating device housing 21.

[0062] Specifically, the second heat insulation plate 215 is preferably a cylindrical plate member, and the thickness direction of the second heat insulation plate 215 is consistent with the axial direction of the coating device housing 21. The radially outer side surface of the second heat insulation plate 215 is fixedly connected to the radially inner side surface of the coating device housing 21. The accommodating cavity 212 and the heating member 211 are respectively located on the two axial sides of the second heat insulation plate 215. For example, the accommodating cavity 212 is located above the second heat insulation plate 215, and the heating member 211 is located below the second heat insulation plate 215. In the thickness direction of the second heat insulation plate 215, a second through hole is provided on the second heat insulation plate 215, and the first shaft member 222 passes through the second through hole. Therefore, a part of the first shaft member 222 is located on the side of the second heat insulation plate 215 facing the accommodating cavity 212, and another part of the first shaft member 222 is located on the side of the first heat insulation plate 214 facing the heating member 211.

[0063] In this embodiment, the second heat insulation plate 215 can prevent excessive heat from being transferred into the accommodation cavity 212. Of course, the heat generated by the heating component 211 will be transferred into the accommodation cavity 212, causing a part of the repair material in the accommodation cavity 212 to also turn into a molten state. And when the repair material changes from a solid state to a molten state, gas will be generated. The second sealing ring 2151 can block the pores between the second heat insulation plate 215 and the coater housing 21, preventing the gas from escaping through the pores between the second heat insulation plate 215 and the coater housing 21, so that the gas accumulates in the accommodation cavity 212 and generates pressure on the repair material, accelerating the flow of the molten repair material into the nozzle channel 2231.

[0064] In some embodiments, a second seal mounting groove is provided on the radially outer side surface of the second heat insulation plate 215, and the second sealing ring 2151 is installed in the second seal mounting groove to prevent the second sealing ring 2151 from falling off. A fourth seal mounting groove is provided on the side wall of the second perforation, and the fourth sealing ring is installed in the fourth seal mounting groove, that is, a fourth sealing ring is provided between the second heat insulation plate 215 and the first shaft body component 222. The fourth seal mounting groove is used to prevent the fourth sealing ring from falling off. The second sealing ring 2151 and the fourth sealing ring can prevent the gas from escaping.

[0065] It should be noted that the manufacturing materials of the first heat insulation plate 214 and the second heat insulation plate 215 are both conventional high-temperature resistant heat insulation materials in the art, such as asbestos materials or heat insulation metal materials with low thermal conductivity and high specific heat capacity, etc. The present invention does not make any limitations.

[0066] In some embodiments of the present invention, the heating component 211 is a plurality of interconnected heating sheets, and all the heating sheets are circumferentially arranged around the first shaft body component 222, and the heating sheets can be connected to the cable.

[0067] Specifically, the heating component 211 is installed in the heating cavity. The heating cavity is set as a cylindrical space, a cuboid space or a spherical space, etc. The present invention does not make any limitations. The first shaft body component 222 passes through the heating cavity along the axis of the coater housing 21 and is then connected to the rotary motor mechanism 11. All the heating sheets form a cylindrical structure, and the first shaft body component 222 passes through the inside of the cylindrical structure, or all the heating sheets are circumferentially around the first shaft body component 222. Therefore, the heating component 211 can uniformly heat a certain section of the first shaft body component 222. The heating sheets can be powered by the cable extending into the oil well borehole to raise the temperature of the heating sheets to the preset temperature.

[0068] In some embodiments, the power transmission line of the heating sheet can be connected to the power connection structure of the rotary motor mechanism 11, and the rotary motor mechanism 11 and the heating component 211 form a parallel electrical device, so that the cable can supply power to the rotary motor mechanism 11 and the heating component 211 respectively.

[0069] In some embodiments, the heating component 211 is a thermite reaction device, in which iron oxide powder, aluminum powder and a heating structure are provided. The heating structure can also be a heating sheet. The power transmission line of the heating structure is connected to the power connection structure of the rotary motor mechanism 11, and the rotary motor mechanism 11 and the thermite reaction device form a parallel electrical device, so that the cable can supply power to the rotary motor mechanism 11 and the thermite reaction device respectively. When the cable supplies power to the heating structure, after the heating structure is heated up, it provides the heat required for the thermite reaction, so that the iron oxide powder and the aluminum powder react with each other and further generate more heat. The heat of the thermite reaction is used to heat the repair material in the shaft channel 2221. Of course, the heating component 211 can also adopt other structural forms, and the present invention is not limited thereto.

[0070] In some embodiments, the accommodating cavity 212 has two parts. One part is a first chamber with a larger diameter, and the other part is a second chamber with a smaller diameter. The first chamber and the second chamber are axially connected in the coating device housing 21, and the first chamber is located between the first heat insulation plate 214 and the second chamber, and the second chamber is located between the first chamber and the heating chamber. Or rather, the second chamber is located below the first chamber, and the heating chamber is located below the second chamber. The diameter of the heating chamber is the same as that of the second chamber. The second heat insulation plate 215 is installed in the heating chamber, which facilitates the disassembly and assembly of the second heat insulation plate 215 and the heating component 211.

[0071] As Figure 5 shown, on the other hand, the present invention provides an oil wellbore repair device, which includes a control mechanism 3 and the above-mentioned oil wellbore repair device. The control mechanism 3 can be arranged on the ground, and the control mechanism 3 is used to control the opening and closing of the oil wellbore repair device.

[0072] Specifically, the oil wellbore repair device may further include a cable winch, a wire winch, a control mechanism 3 and an oil wellbore repair device. The top of the oil wellbore repair device is connected to the wire of the wire winch, so that the oil wellbore repair device can be lowered into or lifted out of the oil wellbore. The oil wellbore repair device is connected to the cable of the cable winch, so that the cable can supply power to the oil wellbore repair device. The control mechanism 3 can control the release and recovery of the cable winch and the wire winch. The control mechanism 3 can control the heating component 211 of the oil wellbore repair device to start heating, stop heating and adjust the heating temperature. The control mechanism 3 can control the rotary motor mechanism 11 to start rotating and stop rotating, and further control the spraying nozzle 223 to start coating the repair material, stop coating the repair material and adjust the flow rate of the repair material.

[0073] In some embodiments, an anchoring structure may also be provided on the outer side of the bridle housing 121 to prevent the bridle mechanism 12 and the rotary motor mechanism 11 from rotating and twisting the cable and the power cable. Of course, the anchoring structure may adopt conventional devices in the art, and the present invention places no restrictions thereon.

[0074] The following Figure 5 describes the usage process of the oil wellbore repair equipment of the present invention.

[0075] The first step is to mill the damaged part of the oil wellbore using a milling device.

[0076] The second step is to connect the power cable to the power cable connector 122 (the power cable connector 122 of the bridle mechanism 12), and connect the cable to the head end of the bridle housing 121 (the bridle housing 121 of the bridle mechanism 12).

[0077] The third step is that on-site workers adjust the control mechanism 3 to lower the oil wellbore repair device into the oil wellbore and gradually lower it to the vicinity of the damaged part of the oil wellbore, where the position of the spray nozzle 223 needs to be lower than the damaged part of the oil wellbore.

[0078] The fourth step is that on-site workers adjust the control mechanism 3 to start the rotation of the rotating shaft of the rotary motor mechanism 11, move the first shaft body component 222 towards the rotary motor mechanism 11, and start heating the heating component 211. When the feed inlet 2222 of the first shaft body component 222 enters the accommodating cavity 212, the feed inlet 2222 communicates with the accommodating cavity 212, and the repair material enters the shaft channel 2221 from the feed inlet 2222 for heating. The heated repair material changes from a solid powder or solid particles into a molten liquid, and the molten liquid repair material flows out along the shaft channel 2221 and the nozzle channel 2231, and then the molten liquid repair material is coated on the damaged part of the oil wellbore. Of course, the rotating shaft of the rotary motor mechanism 11 can continue to rotate, while the first shaft body component 222 will continue to move towards the rotary motor mechanism 11, and the nozzle channel 2231 will also rotate circumferentially synchronously. The inner wall of the oil wellbore at the same height as the damaged part of the oil wellbore can also be evenly coated, and the spray nozzle 223 moves from bottom to top, and the repair material coating also proceeds from bottom to top until the entire damaged part of the oil wellbore is coated.

[0079] The fifth step is that when the entire damaged part of the oil wellbore is coated, on-site workers adjust the control mechanism 3 to shut down the oil wellbore repair device. The on-site workers continue to adjust the control mechanism 3, the power cable winch retracts the power cable, the cable winch retracts the cable, and the oil wellbore repair device is pulled out of the oil wellbore.

[0080] In this article, specific examples are used to elaborate on the principles and implementation modes of the present invention. The description of the above examples is only used to help understand the method and its core idea of the present invention. The above is only the preferred implementation mode of the present invention. It should be noted that due to the limited nature of literal expression and objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the present invention to other occasions without improvement, shall all be regarded as the protection scope of the present invention.

Claims

1. An oil wellbore repair device, characterized in that, It includes a driving mechanism (1) and a coating mechanism (2). The coating mechanism (2) includes a coating device housing (21) and a coating component (22). The coating device housing (21) is sleeved on the circumferential outer side of the coating component (22). The coating device housing (21) further is provided with a heating component (211) and a receiving cavity (212) for accommodating repair materials, which are distributed at intervals along its axial direction. The coating component (22) is connected to the driving mechanism (1) and is driven by the driving mechanism (1) to reciprocate along the axial direction of the coating device housing (21). A guiding channel (221) for applying repair materials to the damaged part of the oil wellbore is provided in the coating component (22). The guiding channel (221) is configured to be connected or disconnected from the receiving cavity (212) based on the driving of the driving mechanism (1). The heating component (211) is configured to heat the repair materials entering the guiding channel (221), so that the repair materials flowing from the receiving cavity (212) into the guiding channel (221) and flowing out of the guiding channel (221) are coated on the damaged part of the oil wellbore in a molten state.

2. The oil wellbore repair device according to claim 1, wherein The coating component (22) includes a spraying nozzle (223) and a first shaft body component (222). Along the axial direction of the coating device housing (21), the head end of the first shaft body component (222) is connected to the driving mechanism (1), the head end of the spraying nozzle (223) is connected to the tail end of the first shaft body component (222), and the spraying nozzle (223) and the first shaft body component (222) are driven by the driving mechanism (1) to reciprocate along the axial direction of the coating device housing (21). A nozzle channel (2231) for applying repair materials to the damaged part of the oil wellbore is provided in the spraying nozzle (223). A shaft body channel (2221) communicating with the nozzle channel (2231) is provided in the first shaft body component (222). The nozzle channel (2231) and the shaft body channel (2221) define the guiding channel (221). Based on the driving of the driving mechanism (1), the nozzle channel (2231) is connected or disconnected from the receiving cavity (212) through the shaft body channel (2221).

3. The oil wellbore repair device according to claim 2, characterized in that, The receiving cavity (212) is circumferentially arranged around the first shaft body component (222). A plurality of feed ports (2222) are provided on the radial side wall of the first shaft body component (222) and are distributed at circumferential intervals. The feed ports (2222) are communicated with the nozzle channel (2231) through the shaft body channel (2221). Based on the driving of the driving mechanism (1), the feed ports (2222) moving with the first shaft body component (222) are connected or disconnected from the receiving cavity (212).

4. The oil wellbore repair device according to claim 3, characterized in that, The coating mechanism (2) further includes a second shaft body component (23). Axially along the applicator housing (21), the end of the second shaft member (23) is connected to the head end of the first shaft member (222) through a spline structure, and the first shaft member (222) passes through the end wall (213) at the end of the applicator housing (21); the radially outer side of the first shaft member (222) is threadedly connected to the end wall (213). The drive mechanism (1) includes a rotary motor mechanism (11) and a power transmission mechanism. The motor shaft of the rotary motor mechanism (11) is fixedly connected to the head end of the first shaft member (222); the power transmission mechanism can transmit the power of the cable to the power connection structure of the rotary motor mechanism (11). Based on the rotation of the shaft of the rotary motor mechanism (11), the first shaft member (222) moves into or out of the applicator housing (21), and correspondingly makes the feed port (2222) communicate or disconnect from the accommodating cavity (212).

5. The oil well borehole repair device according to claim 4, characterized in that, The power transmission mechanism is a hose coupling mechanism (12). The power connection structure of the rotary motor mechanism (11) is connected to the output end of the power transmission structure of the hose coupling mechanism (12), and the input end of the power transmission structure of the hose coupling mechanism (12) is used to connect to the cable.

6. The oil wellbore repair device according to claim 4 or 5, characterized in that, A first heat insulation plate (214) is provided between the accommodating cavity (212) and the rotary motor mechanism (11). The second shaft member (23) passes through the first heat insulation plate (214), and a first sealing ring (2141) is circumferentially provided between the first heat insulation plate (214) and the applicator housing (21).

7. The oil wellbore repair device according to any one of claims 2-5, characterized in that, The nozzle channel (2231) has a nozzle outlet section (2232) for the outflow of the repair material, and an anti-backflow structure is provided in the nozzle outlet section (2232).

8. The oil wellbore repair device according to claim 7, characterized in that, The anti-backflow structure includes a plurality of anti-backflow components (2233) circumferentially and spaced apart along the nozzle outlet section (2232). The anti-backflow component (2233) has a fixed end and a free end. The fixed end of the anti-backflow component (2233) is fixedly connected to the radially inner side wall of the nozzle outlet section (2232), and the free end of the anti-backflow component (2233) is spaced apart from the radially inner side wall of the nozzle outlet section (2232). Along the direction from the inlet of the nozzle outlet section (2232) to the outlet of the nozzle outlet section (2232), the anti-backflow component (2233) extends obliquely towards the outlet of the nozzle outlet section (2232) from the fixed end to the free end.

9. The oil wellbore repair device according to any one of claims 2-5, characterized in that, A second heat insulation plate (215) is provided between the heating component (211) and the accommodating cavity (212). The first shaft member (222) passes through the second heat insulation plate (215), and a second sealing ring (2151) is circumferentially provided between the second heat insulation plate (215) and the applicator housing (21).

10. The oil well borehole repair device according to claim 9, characterized in that, The heating component (211) is a plurality of interconnected heating sheets. All the heating sheets are circumferentially arranged around the first shaft member (222), and the heating sheets can be connected to the cable.

11. An oil wellbore repair device, characterized in that, Comprising a control mechanism (3) and the oil wellbore repair device according to any one of claims 1-10, the control mechanism (3) can be arranged on the ground, and the control mechanism (3) is used to control the opening and shutting down of the oil wellbore repair device.

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