Oil wellbore repair device, system, and method

Abstract

An oil wellbore repair device, system and method. The oil wellbore repair device comprises: a driving mechanism (1) and an applying mechanism (2), wherein the applying mechanism (2) comprises an accommodating unit for holding a repair material and an applying component (22) for applying the repair material to a damaged part of an oil wellbore; the applying component (22) is in transmission connection with the driving mechanism (1) and has a guide channel (221) capable of communicating the accommodating unit with the oil wellbore; and the guide channel (221) is configured such that when an outlet of the guide channel (221) moves to a position where the damaged part of the oil wellbore is located, an inlet of the guide channel (221) is in communication with the accommodating unit. The driving mechanism is driven to drive the applying component to move, so as to cause the guide channel to be in communication with the accommodating cavity, such that the repair material enters the guide channel, and is heated by a heating component to a molten state after entering the guide channel, and the repair material in the molten state flowing out of the guide channel can be applied to the damaged part of the oil wellbore, which can simplify the repair process for the damaged part of the oil wellbore.

Description

Oil wellbore repair device, system and method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese patent application 202311842092.3 filed on December 28, 2023, the contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to the technical field of oil well bore repair, and in particular to an oil well bore repair device, and further to an oil well bore repair system and method. Background Art

[0004] At the end of oil and gas well production, damage often occurs to the wellbore due to various reasons. The traditional treatment method is to seal the damaged area by squeezing cement into the wellbore. This method requires a cement supply device installed on the ground to supply cement, a cement conveying device extending from the ground into the wellbore, and a pressurizing device to ensure smooth cement extrusion from the conveying device. Consequently, traditional repair processes require extensive equipment and require the coordinated operation of both surface and wellbore devices, making the repair process complex.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to overcome the problem of complicated oil well bore damage repair process in the prior art.

[0007] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides an oil well bore repair device, which includes a driving mechanism and a coating mechanism. The coating mechanism includes a coater shell and a coating component. The coater shell is arranged on the circumferential outside of the coating component. The coater shell is also provided with a heating component and a accommodating cavity for accommodating the repair material distributed along its axial direction; the coating component is connected to the driving mechanism to be driven by the driving mechanism to reciprocate along the axial direction of the coater shell; the coating component is provided with a guide channel for applying the repair material to the damaged part of the oil well bore, and the guide channel is configured to be connected or disconnected with the accommodating cavity based on the drive of the driving mechanism; the heating component is configured to heat the repair material entering the guide channel, so that the repair material flowing from the accommodating cavity and flowing out of the guide channel is coated on the damaged part of the oil well bore in a molten form.

[0008] In some embodiments, the coating component includes a spray nozzle and a first shaft component; along the axial direction of the coater housing, the head end of the first shaft component is connected to the driving mechanism, and the head end of the spray nozzle is connected to the end of the first shaft component, and the spray nozzle and the first shaft component are driven by the driving mechanism to reciprocate along the axial direction of the coater housing; a nozzle channel for applying repair material to the damaged part of the oil wellbore is provided in the spray nozzle, and an shaft channel connected to the nozzle channel is provided in the first shaft component, and the nozzle channel and the shaft channel define a guide channel; based on the drive of the driving mechanism, the nozzle channel is connected or disconnected with the accommodating cavity through the shaft channel.

[0009] In some embodiments, the accommodating cavity is circumferentially arranged around the first shaft body component; a plurality of circumferentially spaced feed ports are provided on the radial side wall of the first shaft body component, and the feed ports are connected to the nozzle channel through the shaft body channel; based on the drive of the driving mechanism, the feed ports that move with the first shaft body component are connected or disconnected with the accommodating cavity.

[0010] In some embodiments, the coating mechanism also includes a second shaft component; along the axial direction of the coater housing, the end of the second shaft component is connected to the head end of the first shaft component by a spline structure, and the first shaft component passes through the end shell wall of the end of the coater housing; the radial outer side of the first shaft component is threadedly connected to the end shell wall; the driving mechanism includes a rotating motor mechanism and a power transmission mechanism, and the motor shaft of the rotating motor mechanism is fixedly connected to the head end of the first shaft component; the power transmission mechanism can transmit the power of the cable to the power connection structure of the rotating motor mechanism; based on the rotation of the rotating shaft of the rotating motor mechanism, the first shaft component is screwed in or out of the coater housing, and correspondingly connects or disconnects the feed port and the accommodating cavity.

[0011] In some embodiments, the power transmission mechanism is a bridle mechanism, the power connection structure of the rotating motor mechanism is connected to the output end of the power transmission structure of the bridle mechanism, and the input end of the power transmission structure of the bridle mechanism is used to connect to the cable.

[0012] In some embodiments, a first heat insulation plate is provided between the accommodating cavity and the rotating motor mechanism, the second shaft component passes through the first heat insulation plate, and a first sealing ring is provided circumferentially between the first heat insulation plate and the coater housing.

[0013] In some embodiments, the nozzle channel has a nozzle outlet section for the outflow of the repair material, and a backflow prevention structure is provided in the nozzle outlet section.

[0014] In some embodiments, the anti-backflow structure includes a plurality of anti-backflow components distributed at circumferential intervals 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 radial inner wall of the nozzle outlet section, and the free end of the anti-backflow component is spaced apart from the radial inner 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 toward the outlet of the nozzle outlet section.

[0015] In some embodiments, a second thermal insulation plate is provided between the heating component and the accommodating chamber, the first shaft component passes through the second thermal insulation plate, and a second sealing ring is circumferentially provided between the second thermal insulation plate and the coater housing.

[0016] In some embodiments, the heating component is a plurality of interconnected heating plates, all of which are arranged circumferentially around the first shaft component, and the heating plates can be connected to the electrical cable.

[0017] A second aspect of the present invention provides an oil well bore repair system, which includes a control mechanism and the above-mentioned oil well bore repair device. The control mechanism can be set on the ground and is used to control the opening and closing of the oil well bore repair device.

[0018] A third aspect of the present invention provides an oil well bore repair method, which uses the aforementioned oil well bore repair system to repair the oil well bore, comprising the following steps:

[0019] Using the control mechanism to place the oil well bore repair device into the oil well bore;

[0020] Using a driving mechanism to drive the coating component to move axially along the oil wellbore, so that the outlet of the guide channel moves to the position of the damaged part of the oil wellbore, and the inlet of the guide channel is connected to the accommodating unit;

[0021] The repair material is applied to the damaged portion of the oil wellbore.

[0022] The technical solution of the present invention has the following beneficial effects:

[0023] The driving mechanism drives the coating component to move, connecting the guide channel with the accommodating chamber, allowing the repair material to enter the guide channel. Once in the guide channel, the heating component heats the material to a molten state, and the molten repair material flowing out of the guide channel is applied to the damaged portion of the oil wellbore. After the damaged portion of the oil wellbore is repaired, the driving mechanism drives the coating component to move, disconnecting the guide channel from the accommodating chamber. Therefore, the repair of the damaged portion of the oil wellbore only requires controlling the driving mechanism, without requiring excessive large equipment. The oil wellbore repair device can simplify the repair process of the damaged portion of the oil wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic cross-sectional view of an oil wellbore repair device according to an embodiment of the present invention;

[0025] FIG2 is a partial enlarged schematic diagram of portion A in FIG1 ;

[0026] 3 is a schematic diagram of the connection between the first shaft component and the spray nozzle in one embodiment of the present invention;

[0027] FIG4 is a schematic cross-sectional view of a spray nozzle according to an embodiment of the present invention;

[0028] FIG5 is a schematic diagram of the operation of an oil well bore repair device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction 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 and are not intended to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

[0030] As shown in Figures 1 and 2, 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 accommodating unit for accommodating a repair material and a coating component 22 for applying the repair material to a damaged portion of the oil wellbore. The driving mechanism 1 is in transmission connection with the coating component 22, and the driving mechanism 1 can drive the coating component 22 to move along the axial direction of the oil wellbore. As shown in Figure 1, the coating component 22 has a guide channel 221 that connects the accommodating unit with the oil wellbore. The guide channel 221 is configured such that when the coating component 22 moves along the axial direction of the oil wellbore, causing the outlet of the guide channel 221 to move to the position of the damaged portion of the oil wellbore, the inlet of the guide channel 221 connects to the accommodating unit.

[0031] In the oil well bore repair device provided by the present invention, the coating component 22 has a guide channel 221 that can connect the accommodating unit and the oil well bore. The coating component 22 can be driven to move along the axial direction of the oil well bore by the driving mechanism 1. When the outlet of the guide channel 221 moves to the position of the damaged part of the oil well bore, the inlet of the guide channel 221 is connected with the accommodating unit, and the repair material in the accommodating unit enters the guide channel 221 from the inlet of the guide channel 221 and enters the oil well bore from the outlet of the guide channel 221. Since the outlet of the guide channel 221 is located at the position of the damaged part of the oil well bore at this time, the repair material is applied to the damaged part of the oil well bore, thereby repairing the damaged part of the oil well bore.

[0032] The oil well bore repair device of the present invention drives the coating component 22 to move along the axial direction of the oil well bore through the driving mechanism 1. When the outlet of the guide channel 221 moves to the position of the damaged part of the oil well bore, the repair material enters the guide channel 221 and is then applied to the damaged part of the oil well bore, thereby realizing the repair work of the oil well bore. Compared with the prior art, the oil well bore repair device of the present invention does not use too much large equipment. It can simplify the repair process of the damaged part of the oil well bore and improve the efficiency of the repair work.

[0033] In some embodiments, as shown in Figures 1 and 2, the accommodating unit includes a coater housing 21 and an accommodating chamber 212 disposed within the coater housing 21. The coater housing 21 is sleeved around the outer circumference of the coating component 22. The accommodating chamber 212 is used to accommodate repair material. When the outlet of the guide channel 221 is moved to the location of the damaged portion of the oil wellbore, the inlet of the guide channel 221 communicates with the accommodating chamber 212. The repair material within the accommodating chamber 212 can then be applied to the damaged portion of the oil wellbore through the guide channel 221, thereby repairing the oil wellbore.

[0034] In some embodiments, as shown in Figures 1 and 2, the accommodating unit further includes a heating component 211, which is disposed in the coater housing 21 and axially spaced from the accommodating cavity 212. The heating component 211 is configured to heat the repair material entering the guide channel 221, so that the repair material flowing from the accommodating cavity 212 into the guide channel 221 and flowing out of the guide channel 221 is coated on the damaged portion of the oil wellbore in a molten form.

[0035] Specifically, the oil wellbore repair device is installed near the damaged portion of the oil wellbore, and then repair of the damaged portion of the oil wellbore begins. In the initial state, the coating component 22 is not connected to or disconnected from the accommodating chamber 212, and the repair material in the accommodating chamber 212 cannot enter the guide channel 221. When the oil wellbore repair device enters the operating state, driven by the driving mechanism 1, the inlet of the guide channel 221 of the coating component 22 moves toward the accommodating chamber 212, and then the guide channel 221 of the coating component 22 is connected to the accommodating chamber 212, and the repair material in the accommodating chamber 212 can enter the guide channel 221. Moreover, when the oil well bore repair device enters the working state, the heating component 211 can heat the guide channel 221, and the repair material entering the guide channel 221 becomes molten, and gas is generated in the process of the repair material becoming molten. The gas gathers in the guide channel 221 and the accommodating chamber 212. Under the action of the gravity of the molten repair material itself and the pressure of the gas, the molten repair material flows along the guide channel 221 toward the damaged part of the oil well bore. When the damaged part of the oil well bore is repaired, the driving mechanism 1 drives the inlet of the guide channel 221 of the coating component 22 away from the accommodating chamber 212, so that the guide channel 221 is disconnected from the accommodating chamber 212, and the repair material cannot enter the guide channel 221. Preferably, the repair material is a conventional iron-based alloy powder or particles in the field.

[0036] In this embodiment, the drive mechanism 1 drives the coating component 22 to move, so that the guide channel 221 is connected to the accommodating chamber 212, thereby allowing the repair material to enter the guide channel 221. Once inside the guide channel 221, it is heated to a molten state by the heating component 211. The molten repair material flowing out of the guide channel 221 is then coated on the damaged portion of the oil wellbore. After the damaged portion of the oil wellbore is repaired, the drive mechanism drives the coating component 22 to move, disconnecting the guide channel 221 from the accommodating chamber 212. Therefore, the repair of the damaged portion of the oil wellbore only requires controlling the drive mechanism, without the use of excessive large equipment. The oil wellbore repair device can simplify the repair process of the damaged portion of the oil wellbore. Moreover, the repair material applied to the damaged portion of the oil wellbore forms a dense metal coating layer with excellent sealing properties, which can effectively improve the sealing effect of the damaged portion of the oil wellbore and prevent the interior of the oil wellbore from communicating with the outside through the damaged portion of the oil wellbore.

[0037] 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.

[0038] As shown in Figures 1 to 4, in some embodiments of the present invention, the coating component 22 includes a spray nozzle 223 and a first shaft component 222; along the axial direction of the coater housing 21, the head end of the first shaft component 222 is connected to the driving mechanism 1, and the head end of the spray nozzle 223 is connected to the end of the first shaft component 222, and the spray nozzle 223 and the first shaft component 222 are driven by the driving mechanism 1 to reciprocate along the axial direction of 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 spray nozzle 223, and a shaft channel 2221 connected to the nozzle channel 2231 is provided in the first shaft component 222, and the nozzle channel 2231 and the shaft channel 2221 define a guide channel 221; based on the drive of the driving mechanism 1, the nozzle channel 2231 is connected or disconnected with the accommodating chamber 212 through the shaft channel 2221.

[0039] Specifically, the spray nozzle 223 and the first shaft member 222 can be integrally connected parts, or they can be two independent parts connected together, and the present invention does not impose any restrictions. Along the flow direction of the repair material, the spray 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 guide channel 221. The diameter of the nozzle channel 2231 can be the same as the diameter of the shaft channel 2221 to allow the repair material to flow smoothly. The diameter of the nozzle channel 2231 can also be slightly smaller than the diameter of the shaft channel 2221, which not only ensures that the repair material can smoothly enter the shaft channel 2221, but also limits the speed and flow rate of the repair material outflow, thereby optimizing the coating effect. Preferably, the end section of the nozzle channel 2231 that faces the oil well bore can be configured 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 component 222, that is, the axial direction of the end section of the nozzle channel 2231 extends radially along the first shaft component 222, so that the end section of the nozzle channel 2231 can face the damaged part of the oil well bore vertically. 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 component 222, or the shaft channel inlet is located on the end face of the first shaft component 222 facing the drive mechanism 1, which is not limited by the present invention. The shaft channel outlet is connected to the inlet of the nozzle channel, and the repair material flows out of the nozzle channel outlet and is coated on the damaged part of the oil well bore.

[0040] In this embodiment, when the drive mechanism 1 drives the spray nozzle 223 and the first shaft component 222 to move forward, the inlet of the shaft channel 2221 moves from a position isolated from the accommodating chamber 212 to a position capable of communicating with the accommodating chamber 212, thereby connecting the shaft channel 2221 with the accommodating chamber 212, and further connecting the nozzle channel 2231 with the accommodating chamber 212. The repair material in the accommodating chamber 212 can flow sequentially along the shaft channel 2221 and the nozzle channel 2231 toward the damaged portion of the oil wellbore. The heating component 211 can heat the repair material in the shaft channel 2221, so that the repair material entering the shaft channel 2221 is heated to a molten state, and finally the repair material flows out of the nozzle channel 2231 in a molten state and is applied to the damaged portion of the oil wellbore. When the driving motor drives the spray nozzle 223 and the first shaft component 222 to move in the opposite direction, the inlet of the shaft channel 2221 moves from a position connected with the accommodating chamber 212 to a position isolated from the accommodating chamber 212, so that the nozzle channel 2231 is disconnected from the accommodating chamber 212, the repair material stops entering the nozzle channel 2231, and the repair of the damaged part of the oil wellbore stops.

[0041] In some embodiments, in an initial state, the spray nozzle 223 is located outside the applicator housing 21, and the first shaft member 222 passes through the end of the applicator housing 21 along the axial circumference of the applicator housing 21. Furthermore, a conventional retaining structure in the art may be provided between the first shaft member 222 and the applicator housing 21 to prevent disconnection between the first shaft member 222 and the applicator housing 21, or between the first shaft member 222 and the drive mechanism 1. For example, the first shaft member 222 and the applicator housing 21 are connected by multiple tension springs, the head ends of the tension springs being connected to the inner wall of the applicator housing 21, the tail ends of the tension springs being connected to the first shaft member 222, and the head ends of the tension springs being positioned higher than the tail ends of the tension springs. When the shaft channel 2221 and the accommodating chamber 212 are isolated from each other, the tension springs are in a tensioned state. When the shaft channel 2221 and the accommodating chamber 212 are connected to each other, the tension springs contract and their deformation decreases. Of course, the retaining structure may also have other structural forms, which are not limited by the present invention. In this embodiment, the driving mechanism 1 may include an electric push rod capable of reciprocating the first shaft component 222 along the axial direction of the coater housing 21 .

[0042] In some embodiments, the coating component 22 may include a plurality of circumferentially spaced spray nozzles 223 to expand the coating range.

[0043] As shown in Figure 1, in some embodiments of the present invention, the accommodating chamber 212 is circumferentially arranged around the first shaft body component 222; a plurality of circumferentially spaced feed ports 2222 are provided on the radial side wall of the first shaft body component 222, and the feed ports 2222 are connected to the nozzle channel 2231 through the shaft body channel 2221; based on the drive of the driving mechanism 1, the feed ports 2222 that move with the first shaft body component 222 are connected or disconnected with the accommodating chamber 212.

[0044] Specifically, the accommodating chamber 212 can be configured as a cylindrical, rectangular, or spherical space, although this is not a limitation of the present invention. The first shaft member 222 passes through the accommodating chamber 212 along the axial direction of the applicator housing 21 and is connected to the drive mechanism 1. Therefore, when the accommodating chamber 212 is filled with the repair material, the repair material surrounds the first shaft member 222. The feed port 2222 communicates with the nozzle channel 2231 via the shaft channel 2221.

[0045] In this embodiment, when the driving mechanism 1 drives the spray nozzle 223 and the first shaft component 222 to move forward, the feed port 2222 moves from a position isolated from the accommodating chamber 212 to a position capable of communicating with the accommodating chamber 212, thereby communicating the shaft channel 2221 with the accommodating chamber 212, and further communicating the nozzle channel 2231 with the accommodating chamber 212. The repair material in the accommodating chamber 212 can flow along the various feed ports 2222 toward 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 sufficient repair material in the shaft channel 2221. Moreover, even if some of the feed ports 2222 are blocked, the repair material can still enter the shaft channel 2221 through the other feed ports 2222.

[0046] In some embodiments, the feed port 2222 is configured as an elongated structure with its length extending along the axial direction of the first shaft member 222. This allows for adjustment of the area of ​​the feed port 2222 communicating with the accommodating chamber 212, 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 in a forward direction, the feed port 2222 moves from a position isolated from the accommodating chamber 212 to a position communicating with the accommodating chamber 212. As the area of ​​the feed port 2222 communicating with the accommodating chamber 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 in a reverse direction, the area of ​​the feed port 2222 communicating with the accommodating chamber 212 gradually decreases, reducing the amount of repair material entering the shaft channel 2221. Of course, the feed port 2222 can also be configured as an elliptical structure with its longitudinal axis extending along the axial direction of the first shaft member 222, and this is not a limitation of the present invention.

[0047] As shown in Figures 1 and 2, in some embodiments of the present invention, the coating mechanism 2 also includes a second shaft component 23; along the axial direction of the coater housing 21, the end of the second shaft component 23 is connected to the head end of the first shaft component 222 through a spline structure, and the first shaft component 222 passes through the end shell wall 213 of the end of the coater housing 21; the radial outer side surface of the first shaft component 222 is threadedly connected to the end shell wall 213; the driving mechanism 1 includes a rotating motor mechanism 11 and a power transmission mechanism, and the motor shaft of the rotating motor mechanism 11 is fixedly connected to the head end of the first shaft component 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 shaft of the rotating motor mechanism 11, the first shaft component 222 is screwed in or out of the coater housing 21, and correspondingly connects or disconnects the feed port 2222 with the accommodating cavity 212.

[0048] Specifically, the cable can be connected to the power connection structure of the rotating motor mechanism 11 through the power transmission mechanism, so that the cable can supply power to the rotating motor mechanism 11. The motor rotor of the rotating motor mechanism 11 drives the motor shaft 112 of the rotating motor mechanism 11 to rotate circumferentially, thereby driving the second shaft component 23 to rotate circumferentially. The head end of the second shaft component 23 can be fixedly connected to the motor shaft 112 of the rotating motor mechanism 11 through a threaded structure or an interference fit structure. Preferably, the motor shaft 112 of the rotating motor mechanism 11 has a shaft connection portion, and the shaft connection portion and the power connection structure of the rotating motor mechanism 11 are arranged at intervals along the axial direction of the applicator housing 21; the shaft connection portion faces the first shaft component 222, and the shaft connection portion is fixedly connected to the head end of the second shaft component 23; the power connection structure of the rotating motor mechanism 11 faces away from the first shaft component 222, and the power connection structure of the rotating motor mechanism 11 is connected to the power transmission mechanism. The front end of the applicator housing 21 faces the rotating motor mechanism 11 and is fixedly connected to the rotating motor mechanism 11. The rear end of the applicator housing 21 faces away from the rotating motor mechanism 11 and has an end wall 213 opposite the rotating motor mechanism 11; in other words, the radial direction of the end wall 213 is consistent with the radial direction of the applicator housing 21. The radially outer portion of the end wall 213 is fixedly connected to the radial sidewall of the applicator housing 21. A mounting hole is provided through the end wall 213 along its thickness, or along the axial direction of the applicator housing 21, and the sidewall of the mounting hole is provided with an internal thread. The first shaft component 222 passes through the mounting hole along the axial direction of the applicator housing 21, and an external thread is provided on the radial outer side wall of the first shaft component 222. The internal thread of the mounting hole and the external thread of the first shaft component 222 can be threadedly matched, so that the first shaft component 222 can be screwed into or out of the applicator housing 21 along the mounting hole. Of course, during the process of screwing the first shaft component 222 into or out of the applicator housing 21 along the mounting hole, the first shaft component 222 and the second shaft component 23 are not disconnected, so that the rotating motor mechanism 11 can always control the movement of the first shaft component 222. In addition, the length of the spline groove should be set to be long to allow the first shaft component 222 to move back and forth along the spline groove.

[0049] In this embodiment, when the rotating motor mechanism 11 rotates forward, the first shaft component 222 is screwed into the interior of the applicator housing 21, and at the same time the spray nozzle 223 moves toward the rotating motor mechanism 11 (i.e., moves forward); the feed port 2222 moves from a position isolated from the accommodating chamber 212 to a position where it can communicate with the accommodating chamber 212, so that the shaft channel 2221 is connected to the accommodating chamber 212, and then the nozzle channel 2231 is connected to the accommodating chamber 212, and the repair material in the accommodating chamber 212 can flow along each feed port 2222 to the shaft channel 2221 and the nozzle channel 2231. And since the accommodating cavity 212 is arranged around the first shaft component 222, and the feed port 2222 is circumferentially distributed on the radial side wall of the first shaft component 222, during the rotation of the first shaft component 222, the feed port 2222 and the accommodating cavity 212 can always remain connected, so that the repair material can continuously enter the shaft channel 2221.

[0050] It should be noted that the power transmission mechanism is a conventional power transmission device in the art, and the present invention will not elaborate on its structure and principle.

[0051] It should also be noted that the rotating motor mechanism 11 can be a conventional motor mechanism in the field. For example, the rotating motor mechanism 11 can be selected as a motor mechanism used in a downhole pulse generator. Of course, the rotating motor mechanism 11 can also be any other motor mechanism that can achieve the above-mentioned technical effects. However, to facilitate understanding of the present invention, this embodiment briefly illustrates the rotating motor mechanism 11. In some embodiments, the rotating motor mechanism 11 includes a motor mounting shell 111, a motor rotor structure, a motor stator structure, a bearing component 113, a rotor spindle connector, and a motor connector 114 as an electrical connection structure. 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 shaft 112, etc. The bearing component 113 is fixedly mounted in the motor mounting housing 111, and the axial directions of the bearing component 113 and the motor mounting housing 111 are aligned with the axial direction of the applicator housing 21. The rotor spindle connector is mounted radially inward of the bearing component 113. The head end of the rotor spindle connector is connected to the end of the motor connector 114. The head end of the motor connector 114 is connected to the power transmission mechanism. The end of the rotor spindle connector is connected to the head end of the motor shaft 112. The end of the motor shaft 112 is connected to the head end of the second shaft component 23. When the cable supplies power to the motor connector 114, a rotating magnetic field is generated at the motor stator structure, which in turn drives the motor rotor to rotate. The motor rotor structure drives the motor shaft 112 to rotate, and the motor shaft 112 further drives the second shaft component 23, the first shaft component 222, and the spray nozzle 223 to rotate.

[0052] Of course, in other embodiments, the rotating motor mechanism 11 may also adopt other structural forms, and the rotating motor mechanism 11 of the present invention is not limited to the embodiments provided by the present invention.

[0053] In some embodiments, a shaft mounting groove is provided at the distal end of the second shaft component 23, and a plurality of circumferentially spaced spline grooves are provided on the radial sidewalls of the shaft mounting groove. A plurality of circumferentially spaced splines 2223 are provided on the radially outer side surface of the head end of the first shaft component 222, with the splines 2223 corresponding one-to-one with the spline grooves. The head end of the first shaft component 222 is spaced apart from the bottom wall of the shaft mounting groove along the axial direction of the applicator housing 21. Along the axial direction of the applicator housing 21, the length of the spline groove is greater than the length of the spline 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 component 222, so that the first shaft component 222 can extend or retract from the shaft mounting groove.

[0054] As shown in Figure 1, in some embodiments of the present invention, the power transmission mechanism is a bridle mechanism 12, the power connection structure of the rotating motor mechanism 11 is connected to the output end of the power transmission structure of the bridle mechanism 12, and the input end of the power transmission structure of the bridle mechanism 12 is used to connect to the cable.

[0055] It should be noted that the bridle mechanism 12 is a common power transmission device in the art. It performs signal transmission after cable connection, load-bearing functions for steel cable connection, and detachment in the event of a jam. The present invention will not further elaborate on its structure and principles. For example, the bridle mechanism 12 of the present invention can be an oil-filled balanced bridle or the FYMLT-IQB well logging bridle produced by Xi'an Fangyuan Energy Engineering Co., Ltd. However, to facilitate understanding of the present invention, the bridle mechanism 12 is briefly described below in this embodiment.

[0056] Specifically, the bridle mechanism 12 includes a bridle shell 121, in which a cable connector 122, a circuit connection shaft 123, and a motor connector 124 are mounted. The axes of the bridle shell 121, the cable connector 122, the circuit connection shaft 123, and the motor connector 124 are in the same direction as the axis of the applicator shell 21. A plurality of insulating clips are provided between the inner wall of the bridle shell 121 and the circuit connection shaft 123. Preferably, the insulating clips are located between the end of the circuit connection shaft 123 and the inner wall of the bridle shell 121. A first mounting groove and a second mounting groove are respectively provided at both ends of the circuit connection shaft 123, and the first mounting groove and the second mounting groove are recessed from the end of the circuit connection shaft 123 to 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. The radially outer side of the distal end of the cable connector 122 is provided with a first external thread, which mates with the first internal thread of the first mounting slot. The radially outer side of the distal end of the motor connector 124 is provided with a second external thread, which mates with the second internal thread of the second mounting slot. The distal end of the cable connector 122 is used to connect to the cable, while the distal end of the motor connector 124 is connected to the power connection structure of the rotating motor mechanism 11. A cable connector is also provided on the end of the bridle housing 121 facing away from the rotating motor mechanism 11, which is used to connect to the ground cable.

[0057] In some embodiments, the oil well bore repair device also includes a connecting sleeve, which is sleeved on the outside of the rotating motor mechanism 11 (such as the motor mounting shell 111) and the bridle shell 121, and the radial side surfaces of the connecting sleeve are fixedly connected (for example, threadedly connected) to the radial outer side surfaces of the motor mounting shell 111 and the radial outer side surfaces of the bridle shell 121, so that the rotating motor mechanism 11 and the bridle mechanism 12 are firmly connected.

[0058] As shown in Figures 1 and 2, in some embodiments of the present invention, a first heat insulation plate 214 is provided between the accommodating cavity 212 and the rotating motor mechanism 11, the second shaft component 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.

[0059] Specifically, the first heat insulation plate 214 is preferably a cylindrical plate, and the thickness direction of the first heat insulation plate 214 is consistent with the axial direction of the applicator shell 21. The radial outer side of the first heat insulation plate 214 is fixedly connected to the radial inner side of the applicator shell 21. The accommodating cavity 212 and the rotating motor mechanism 11 are respectively located on both sides of the axial direction of the first heat insulation plate 214, for example, the accommodating cavity 212 is located below the first heat insulation plate 214, and the rotating 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 component 23 passes through the first through-hole. Therefore, a portion of the second shaft component 23 is located on the side of the first heat insulation plate 214 facing the rotating motor mechanism 11, and the other portion of the second shaft component 23 is located on the side of the first heat insulation plate 214 facing the accommodating cavity 212.

[0060] In this embodiment, the first heat shield 214 can prevent excessive heat from being transferred to the rotating motor mechanism 11, thereby preventing it from affecting normal operation. The heat generated by the heating component 211 is transferred to the accommodating cavity 212, causing a portion of the repair material in the accommodating cavity 212 to molten state. 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 gap between the first heat shield 214 and the applicator housing 21, preventing the gas from escaping through the gap between the first heat shield 214 and the applicator housing 21. The gas accumulates in the accommodating cavity 212, exerting pressure on the repair material and accelerating the flow of the molten repair material into the nozzle channel 2231.

[0061] In some embodiments, a first sealing member installation groove is defined on the radially outer surface of the first thermal insulation board 214. A first sealing ring 2141 is installed in the first sealing member installation groove to prevent the first sealing ring 2141 from falling out. A third sealing member installation groove is defined on the sidewall of the first perforation. A third sealing ring is installed in the third sealing member installation groove. Specifically, a third sealing ring is disposed between the first thermal insulation board 214 and the second shaft member 23. The third sealing member installation groove is used to prevent the third sealing ring from falling out. The first sealing ring 2141 and the third sealing ring can prevent gas from escaping.

[0062] In some embodiments, the head end of the rotating motor mechanism 11 is connected to the tail end of the bridle mechanism 12, and the tail end of the rotating motor mechanism 11 extends into the head end of the coater housing 21 along the axial direction of the coater housing 21, and the inner radial side surface of the head end of the coater housing 21 is threadedly connected to the outer radial side surface of the tail end of the motor mounting shell 111. A filling structure is provided between the first heat shield 214 and the rotating motor mechanism 11 to prevent direct contact between the first heat shield 214 and the rotating motor mechanism 11. The filling structure can be an isolation frame or a solid metal block, etc., and the present invention is not limited thereto. The first heat shield 214 is located between the filling structure and the accommodating cavity 212.

[0063] As shown in FIG. 4 , 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 a backflow prevention structure is provided in the nozzle outlet section 2232 .

[0064] Specifically, the nozzle outlet section 2232 is the end section of the nozzle channel 2231. After the repair material flows out of the nozzle outlet section 2232, it is coated on the damaged part of the oil wellbore. The anti-backflow structure can prevent the molten liquid of the repair material from flowing back.

[0065] As shown in Figure 4, in some embodiments of the present invention, the anti-backflow structure includes a plurality of anti-backflow components 2233 distributed at circumferential intervals 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 radial inner wall of the nozzle outlet section 2232, and the free end of the anti-backflow component 2233 is spaced apart from the radial inner 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 from the fixed end to the free end toward the outlet of the nozzle outlet section 2232.

[0066] Specifically, the fixed end of the backflow prevention component 2233 is fixedly connected to the radially inner sidewall of the nozzle outlet section 2232, while the free end of the backflow prevention component 2233 extends to the radial center of the nozzle outlet section 2232. Furthermore, the free ends of the backflow prevention components 2233 may contact each other or be spaced apart by a certain distance. Along the flow direction of the repair material, the backflow prevention component 2233 extends obliquely from the fixed end to the free end toward the outlet of the nozzle outlet section 2232.

[0067] In an embodiment, when the molten liquid of the repair material is applied to the damaged location of the oil wellbore, the pressure of the movement can cause the molten liquid to stretch the anti-backflow components 2233, causing them to bend radially outward from the nozzle outlet section 2232. The diameter of the opening between the anti-backflow components 2233 increases, allowing the molten liquid to flow out. However, if for some reason the molten liquid flows back toward the nozzle outlet section 2232, the returning molten liquid will exert a force on the anti-backflow components 2233 in the opposite direction of the molten liquid outflow, causing the anti-backflow components 2233 to tighten, reducing the diameter of the opening between the anti-backflow components 2233 or even closing it, thereby preventing the molten liquid from flowing back.

[0068] In some embodiments, the backflow prevention components 2233 are arranged in multiple rows along the circumference of the nozzle outlet section 2232, with at least two backflow prevention components 2233 in each row, so as to enhance the backflow prevention capability.

[0069] 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 limit this.

[0070] As shown in Figures 1 and 2, in some embodiments of the present invention, a second thermal insulation plate 215 is provided between the heating component 211 and the accommodating cavity 212, the first shaft component 222 passes through the second thermal insulation plate 215, and a second sealing ring 2151 is circumferentially provided between the second thermal insulation plate 215 and the applicator housing 21.

[0071] Specifically, the second heat insulation plate 215 is preferably a cylindrical plate, and the thickness direction of the second heat insulation plate 215 is consistent with the axial direction of the applicator shell 21. The radial outer side of the second heat insulation plate 215 is fixedly connected to the radial inner side of the applicator shell 21. The accommodating cavity 212 and the heating component 211 are respectively located on the 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 component 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 component 222 passes through the second through-hole. Therefore, a portion of the first shaft component 222 is located on the side of the second heat insulation plate 215 facing the accommodating cavity 212, and the other portion of the first shaft component 222 is located on the side of the first heat insulation plate 214 facing the heating component 211.

[0072] In this embodiment, the second heat shield 215 can prevent excessive heat from being transferred to the accommodating chamber 212. Of course, the heat generated by the heating component 211 will be transferred to the accommodating chamber 212, causing a portion of the repair material in the accommodating chamber 212 to become molten. In addition, gas will be generated in the process of the repair material changing from a solid state to a molten state. The second sealing ring 2151 can block the gap between the second heat shield 215 and the applicator housing 21, preventing the gas from escaping from the gap between the second heat shield 215 and the applicator housing 21. The gas will gather in the accommodating chamber 212 and exert pressure on the repair material, thereby accelerating the flow of the molten repair material into the nozzle channel 2231.

[0073] In some embodiments, a second sealing member installation groove is defined on the radially outer surface of the second thermal insulation plate 215. A second sealing ring 2151 is installed in the second sealing member installation groove to prevent the second sealing ring 2151 from falling out. A fourth sealing member installation groove is defined on the sidewall of the second perforation. A fourth sealing ring is installed in the fourth sealing member installation groove. Specifically, a fourth sealing ring is disposed between the second thermal insulation plate 215 and the first shaft member 222. The fourth sealing member installation groove is used to prevent the fourth sealing ring from falling out. The second sealing ring 2151 and the fourth sealing ring can prevent gas from escaping.

[0074] It should be noted that the manufacturing materials of the first insulation board 214 and the second insulation board 215 are conventional high-temperature resistant insulation materials in the field, such as asbestos materials or insulation metal materials with low thermal conductivity and high specific heat capacity, etc., and the present invention does not impose any restrictions.

[0075] In some embodiments of the present invention, the heating component 211 is a plurality of interconnected heating plates, all of which are arranged circumferentially around the first shaft component 222 , and the heating plates can be connected to electrical cables.

[0076] Specifically, the heating component 211 is installed in the heating chamber, and the heating chamber is configured as a cylindrical space, a rectangular space, or a spherical space, etc., which is not limited by the present invention. The first shaft component 222 passes through the heating chamber along the axial direction of the applicator housing 21 and is connected to the rotating motor mechanism 11. All heating plates form a cylindrical structure, and the first shaft component 222 passes through the interior of the cylindrical structure, or in other words, all heating plates circumferentially surround the first shaft component 222, so that the heating component 211 can uniformly heat a certain section of the first shaft component 222. The heating plate can be powered by a cable inserted into the wellbore of the oil well to heat the heating plate to a preset temperature.

[0077] In some embodiments, the power transmission line of the heating plate can be connected to the power connection structure of the rotating motor mechanism 11, and a parallel power device is formed between the rotating motor mechanism 11 and the heating component 211, so that the cable can supply power to the rotating motor mechanism 11 and the heating component 211 respectively.

[0078] In some embodiments, the heating component 211 is a thermite reaction device, which is provided with iron oxide powder, aluminum powder, and a heating structure. The heating structure may also be a heating plate. The power transmission line of the heating structure is connected to the power connection structure of the rotating motor mechanism 11, and the rotating motor mechanism 11 and the thermite reaction device constitute a parallel power device, so that the cable can respectively supply power to the rotating motor mechanism 11 and the thermite reaction device. When the cable supplies power to the heating structure, the heating structure heats up and provides the heat required for the thermite reaction, causing the iron oxide powder and the aluminum powder to react and further generate more heat. The heat from 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, which are not limited by the present invention.

[0079] In some embodiments, the accommodating chamber 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 connected in the axial direction of the applicator housing 21, and the first chamber is located between the first thermal insulation plate 214 and the second chamber, and the second chamber is located between the first chamber and the heating chamber. In other words, 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 the diameter of the second chamber. The second thermal insulation plate 215 is installed in the heating chamber to facilitate the disassembly and assembly of the second thermal insulation plate 215 and the heating component 211.

[0080] As shown in FIG5 , the second aspect of the present invention provides an oil well bore repair system, which includes a control mechanism 3 and the above-mentioned oil well bore repair device. The control mechanism 3 can be set on the ground, and the control mechanism 3 is used to control the opening and closing of the oil well bore repair device.

[0081] Specifically, the oil well bore repair system may also include a cable winch, a cable winch, a control mechanism 3, and an oil well bore repair device. The top of the oil well bore repair device is connected to the cable of the cable winch so that the oil well bore repair device can be dropped into the oil well bore or lifted out of the oil well bore. The oil well bore repair device is connected to the cable of the cable winch so that the cable can power the oil well bore repair device. The control mechanism 3 can control the release and recovery of the cable winch and the cable winch, and the control mechanism 3 can control the heating component 211 of the oil well bore repair device to start heating, stop heating, and adjust the heating temperature. The control mechanism 3 can control the rotating motor mechanism 11 to start rotating and stop rotating, and then control the spray nozzle 223 to start applying the repair material, stop applying the repair material, and adjust the flow rate of the repair material.

[0082] In some embodiments, an anchoring structure may be further provided on the outside of the bridle housing 121 to prevent the bridle mechanism 12 and the rotary motor mechanism 11 from rotating and twisting the cables and electric wires. Of course, the anchoring structure may be a conventional device in the art, and the present invention is not limited thereto.

[0083] A third aspect of the present invention provides an oil well bore repair method, wherein the oil well bore repair method uses the above-mentioned oil well bore repair system to repair the oil well bore, comprising the following steps:

[0084] Use the control mechanism 3 to place the oil well bore repair device into the oil well bore;

[0085] The driving mechanism 1 is used to drive the coating component 22 to move axially along the oil wellbore, so that the outlet of the guide channel 221 moves to the position of the damaged part of the oil wellbore, and the inlet of the guide channel 221 is connected to the accommodating unit;

[0086] Applying repair material to damaged areas of an oil wellbore.

[0087] The process of the oil wellbore repair method of the present invention will be described below with reference to FIG5 .

[0088] The first step is to mill the damaged parts of the oil wellbore using milling equipment.

[0089] The second step is to connect the cable to the cable connector 122 (the cable connector 122 of the bridle mechanism 12 ), and connect the cable to the head end of the bridle shell 121 (the bridle shell 121 of the bridle mechanism 12 ).

[0090] In the third step, the on-site staff adjusts the control mechanism 3 to place the oil wellbore repair device into the oil wellbore and gradually lower it to the area adjacent to 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.

[0091] In the fourth step, the on-site staff adjusts the control mechanism 3, causing the rotating shaft of the rotating motor mechanism 11 to begin rotating, the first shaft component 222 to move toward the rotating motor mechanism 11, and the heating component 211 to begin heating. When the feed port 2222 of the first shaft component 222 enters the accommodating chamber 212 and the feed port 2222 communicates with the accommodating chamber 212, the repair material enters the shaft channel 2221 through the feed port 2222 and is heated. The heated repair material transforms from a solid powder or solid granules into a molten liquid. The molten liquid repair material flows out along the shaft channel 2221 and the nozzle channel 2231, and is then applied to the damaged area of ​​the oil wellbore. Of course, the rotating shaft of the rotating motor mechanism 11 can continue to rotate, and the first shaft component 222 will continue to move toward the rotating motor mechanism 11, and the nozzle channel 2231 also rotates synchronously in a circumferential direction. The inner wall of the oil well bore at the same height as the damaged part of the oil well bore can also be evenly coated, and the spray nozzle 223 moves from bottom to top, and the repair material coating is also carried out from bottom to top until all the damaged parts of the oil well bore are coated.

[0092] In step 5, once all damaged areas of the oil wellbore have been coated, the on-site staff adjusts control mechanism 3 to shut down the oil wellbore repair device. The on-site staff continues to adjust control mechanism 3, causing the cable winch to retract the cable, and the oil wellbore repair device to be pulled out of the oil wellbore.

[0093] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the present invention to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. An oil wellbore repair device, characterized in that, include: A coating mechanism (2), the coating mechanism (2) comprising a containing unit for containing a repair material and a coating component (22) for applying the repair material to a damaged part of an oil wellbore; and, A driving mechanism (1), the driving mechanism (1) being drivingly connected to the coating component (22) and used for driving the coating component (22) to move along the axial direction of the oil well bore; The coating component (22) has a guide channel (221) that can connect the accommodating unit with the oil well bore, and the guide channel (221) is configured so that when the coating component (22) moves along the axial direction of the oil well bore and the outlet of the guide channel (221) moves to the position of the damaged part of the oil well bore, the inlet of the guide channel (221) is connected with the accommodating unit.

2. The oil wellbore repair device according to claim 1, characterized in that, The accommodating unit comprises a coater housing (21) and an accommodating chamber (212) arranged in the coater housing (21); the coater housing (21) is sleeved on the circumferential outer side of the coating component (22); the accommodating chamber (212) is used to accommodate the repair material; and the guide channel (221) is configured such that when the outlet of the guide channel (221) moves to the position of the damaged part of the oil wellbore, the inlet of the guide channel (221) is connected to the accommodating chamber (212).

3. The oil well borehole repair device according to claim 2, characterized in that The accommodating unit further comprises a heating component (211), wherein the heating component (211) is arranged in the coating device housing (21) and is axially spaced apart from the accommodating chamber (212), and the heating component (211) is arranged to heat the repair material entering the guide channel (221), so that the repair material flowing from the accommodating chamber (212) into the guide channel (221) and flowing out of the guide channel (221) is coated in a molten form on the damaged part of the oil wellbore.

4. The oil wellbore repair device according to claim 3, wherein, The coating component (22) comprises a spray nozzle (223) and a first shaft component (222); Along the axial direction of the coater housing (21), the head end of the first shaft component (222) is connected to the driving mechanism (1), the head end of the spray nozzle (223) is connected to the tail end of the first shaft component (222), and the spray nozzle (223) and the first shaft component (222) are driven by the driving mechanism (1) to reciprocate along the axial direction of the coater housing (21); The spray nozzle (223) is provided with a nozzle channel (2231) for applying the repair material to the damaged part of the oil well shaft, and the first shaft component (222) is provided with an axial channel (2221) connected to the nozzle channel (2231), and the nozzle channel (2231) and the axial channel (2221) define the guide channel (221); based on the drive of the drive mechanism (1), the nozzle channel (2231) is connected to or disconnected from the accommodating chamber (212) through the axial channel (2221).

5. The oil wellbore repair device according to claim 4, wherein, The accommodation cavity (212) is circumferentially arranged around the first shaft member (222); A plurality of feed ports (2222) are circumferentially and spaced apart 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 port (2222) moving with the first shaft member (222) communicates or disconnects from the accommodation cavity (212).

6. The oil wellbore repair device according to claim 5, wherein, The coating mechanism (2) further includes a second shaft member (23); Along the axis of the coater 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 coater housing (21); the radial outer surface 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 coater housing (21), and correspondingly, the feed port (2222) communicates or disconnects from the accommodation cavity (212).

7. The oil well borehole repair device according to claim 6, characterized in that, The power transmission mechanism is a cable gland 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 cable gland mechanism (12), and the input end of the power transmission structure of the cable gland mechanism (12) is used to connect to the cable.

8. The oil wellbore repair device according to claim 6 or 7, characterized in that, A first heat insulation plate (214) is provided between the accommodation 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 arranged between the first heat insulation plate (214) and the coater housing (21).

9. The oil wellbore repair device according to any one of claims 4-7, 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).

10. The oil wellbore repair device according to claim 9, 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 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 member (2233) extends obliquely towards the outlet of the nozzle outlet section (2232) from the fixed end to the free end.

11. The oil well borehole repair device according to any one of claims 4-7, characterized in that, 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 coater housing (21).

12. The oil well borehole repair device according to claim 11, wherein, The heating member (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 a cable.

13. An oil wellbore repair system, characterized in that, It includes a control mechanism (3) and the oil wellbore repair device according to any one of claims 1 - 12. 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.

14. A method for repairing an oil well borehole, characterized in that, Using the oil wellbore repair system according to claim 13 to repair the oil wellbore, comprising the following steps: Using the control mechanism (3) to lower the oil wellbore repair device into the oil wellbore; Using the driving mechanism (1) to drive the coating member (22) to move axially along the oil wellbore, so that the outlet of the guiding channel (221) moves to the position of the damaged part of the oil wellbore, and the inlet of the guiding channel (221) is communicated with the accommodating unit; Applying the repair material to the damaged part of the oil wellbore.

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