Grinding type underground cutter for oil extraction pipe

Abstract

The invention discloses a grinding type underground cutter for an oil extraction pipe, which relates to the technical field of oil collection equipment and comprises a clamping mechanism and a cutting mechanism. The clamping mechanism ensures that the device is stably fixed in an underground pipeline through an anchoring assembly and a first driving assembly; the cutting mechanism adopts a mode of combining a grinding tool bit and a blade, so that efficient and stable pipeline cutting is realized; the stability and durability of blade installation are enhanced through the design of a V-shaped groove of the grinding tool bit, the feeding assembly and the second driving assembly work cooperatively, and the cutting precision and efficiency are ensured; the device is compact in structure, convenient to operate, easy to maintain and suitable for cutting tasks of pipelines of different materials and thicknesses, and an efficient and safe solution is provided for underground operation.

Description

Technical Field

[0001] The invention relates to the technical field of oil collection equipment, in particular to a grinding downhole cutter for oil production pipes. Background Art

[0002] In the process of oil extraction and transportation, oil pipelines are key infrastructures, and their safety and reliability are directly related to the stable operation of the entire production system. However, due to the long-term exposure of pipelines to harsh underground environments, they are affected by corrosion, wear, scaling and other factors, and the inner wall of the pipeline may be seriously damaged or even perforated, which will not only affect the normal flow of oil, but also may cause leakage accidents, affecting the environment and the safety of human life and property. Therefore, it is necessary to cut the pipeline for subsequent maintenance.

[0003] The existing mechanical cutting method requires a drilling rig for hoisting and cutting, while the abrasive cutter does not require a drilling rig, which saves costs and is easy to operate.

[0004] The existing patent with publication number CN111922418A discloses an underground inner wall cutter, comprising: a lead screw, on which sliding joints arranged relatively are sleeved; a tool holder, which is sleeved on the lead screw, the tool holder is located between two sliding joints, and a cutter is fixedly arranged on the tool holder; a connecting arm, a plurality of connecting arms are evenly arranged on both sides of the tool holder, and the two ends of the connecting arm are respectively hinged to the sliding joint and the tool holder; a driving device, the driving device drives the two sliding joints to move relative to or away from each other on the lead screw; the underground inner wall cutter of this invention drives the two sliding joints to move relative to or away from each other on the lead screw through the driving device, and the movement of the sliding joint on the lead screw will drive the tool holder to move radially along the lead screw through the connecting arm, thereby adjusting the extended length of the cutter, and the cutting starts when the cutter contacts the inner wall of the pipe, making the cutting inside the pipe simpler.

[0005] The device cannot be stably fixed in the downhole pipeline, and the grinding cutter head is easily stuck when it is recovered after cutting. Therefore, the present invention proposes a grinding downhole cutter for oil production pipes. Summary of the invention

[0006] The purpose of the present invention is to provide a grinding downhole cutter for oil production pipes to solve the problem proposed in the above background technology that it needs to be stably fixed on the downhole pipe and hoisted on the drilling rig for cutting. Further, a grinding downhole cutter is developed to save costs and is easy to operate.

[0007] To achieve the above object, the present invention provides the following technical solution: a grinding downhole cutter for oil production tubing, comprising:

[0008] The clamping mechanism comprises a housing 1, an anchoring assembly and a first driving assembly;

[0009] The anchoring assembly is movably arranged on the housing 1 and used to fix the housing 1 on the inner wall of the underground pipeline, and the first driving assembly is fixed in the housing 1 and used to drive the anchoring assembly to open or close;

[0010] The cutting mechanism comprises a second housing, a cutter head body, a grinding cutter head, a blade, a feed assembly and a second drive assembly;

[0011] The cutter head body is mounted on shell two, and the grinding cutter head is mounted on the cutter head body through a pin; a V-shaped groove is provided on the grinding cutter head, the blade is located in the V-shaped groove and is fastened to the grinding cutter head through a top screw and a nut, the second drive assembly is located in shell two and is used to drive the cutter head body to cut the downhole pipeline, and the feed assembly is located in shell two and is used to link the grinding cutter head on the cutter head body to open when the anchor assembly is opened.

[0012] Furthermore, the anchor assembly includes a connecting piece arranged on shell one, on which an anchor leg one is fixed, on which an anchor leg two is hingedly provided, one end of the anchor leg two is provided with a limiting ring which is rotated by a transmission shaft, and the limiting ring is slidably connected to the connecting piece through a sliding groove.

[0013] Furthermore, the first driving assembly includes a driving member arranged at one end of the connecting member, a disc spring is sleeved at the connection between the connecting member and the driving member, a slider and a support rod are respectively provided at both ends of the disc spring, and a pin for limiting the position of the slider is provided on the slider.

[0014] Furthermore, the feed assembly includes a feed rod, which is located in a shell and has a connecting shaft at one end. A resistance spring is sleeved on the circumferential surface of the connecting shaft. The feed rod maintains a certain pressure under the action of the connecting shaft and keeps the blade in close contact with the object to be cut at all times. When the connecting shaft rotates, the grinding head and the blade also rotate accordingly; the preload force of the resistance spring can be adjusted.

[0015] Furthermore, the second driving assembly includes a reducer disposed at one end of the connecting shaft, and a cutting motor is disposed at one end of the reducer;

[0016] It also includes retaining rings and connecting screws which are arranged at both ends of the resistance spring and are used to assist the resistance spring in sliding or resetting.

[0017] Furthermore, the grinding cutter heads are evenly distributed on the circumference of the cutter head body, and the grinding cutter heads are clamped on the feed rod, and the feed rod is tightly connected to the retaining ring through a feed spring; the shell body 2 is connected with a threaded ring through a threaded connection, and the retaining ring is clamped in the groove of the threaded ring, and the movement of the feed rod drives the grinding cutter heads to rotate around the pin.

[0018] Furthermore, it also includes a leg-opening motor, which is transmission-connected to an electromagnetic clutch, which is transmission-connected to a ball screw, which is threadedly connected to a ball nut, which is threadedly connected to a propulsion rod, and which is screwed to a push ring.

[0019] Furthermore, the threaded ring is connected to the shell one and the shell two respectively through threads, and the shell one and the shell two are firmly connected to the support rod through pins.

[0020] Furthermore, it also includes a supporting shell, a slider, a cylindrical pin 1, a cylindrical pin 2 and a fixed block are provided at one end of the disc spring, and the slider is fastened to the fixed block by a screw; the slider is connected to the anchor leg 1 through the cylindrical pin 1, and the anchor leg 1 is tightly connected to one end of the anchor leg 2 through the cylindrical pin 2; the other end of the anchor leg 2 is connected to the supporting shell through the cylindrical pin 2, so as to form two anchoring structures with identical structures and symmetrical distribution.

[0021] Furthermore, the grinding tool heads are provided in plurality, and the plurality of grinding tool heads are evenly distributed in a circle along the center of the tool head body.

[0022] Compared with the prior art, the present invention has the following significant effects:

[0023] 1. The device uses a precisely designed cutting mechanism and a combination of a grinding cutter head and a blade to achieve efficient cutting of underground pipes. The V-groove design on the grinding cutter head not only provides a stable blade installation base, but also ensures the stability and durability of the blade during the cutting process. The ingenious design of the feed assembly enables the blade to maintain close contact with the inner wall of the pipe during the cutting process. By adjusting the preload of the resistance spring or replacing blades of different specifications, it can flexibly cope with pipes of different materials and thicknesses, thereby achieving efficient and stable cutting effects. In addition, the coordination of the reducer and the cutting motor in the second drive assembly further improves the cutting accuracy and efficiency.

[0024] 2. In order to ensure safety and stability during the cutting process, the device is equipped with an advanced clamping mechanism. The anchor assembly achieves a firm fixation of the inner wall of the underground pipe through the hinged design of anchor leg 1 and anchor leg 2, and the sliding connection between the limit collar and the connector. The disc spring and slider mechanism in the first drive assembly provide a strong driving force to ensure that the anchor assembly can maintain a stable tightening state during the cutting process. This design not only improves the safety of the operation, but also reduces the risk of accidents caused by equipment shaking or falling off, providing reliable safety protection for underground operations.

[0025] 3. The structural design of the present invention fully considers the convenience of operation and the ease of maintenance. For example, the modular design of the feed assembly and the cutting mechanism makes it very convenient to disassemble and replace the components. Users can easily adjust the preload of the resistance spring or replace blades of different specifications according to actual operation requirements to adapt to different cutting tasks. In addition, the structure of the entire device is compact and the layout is reasonable, which is convenient for operation in a small underground space. At the same time, the components are made of high-strength and corrosion-resistant materials, which improves the durability and service life of the equipment and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an axonometric view of the grinding downhole cutter for oil production tubing of the present invention;

[0027] Figure 2 It is a partial perspective schematic diagram of the grinding downhole cutter for oil production tubing of the present invention;

[0028] Figure 3 for Figure 2 A schematic diagram of the structure enlargement at the center A;

[0029] Figure 4 A bottom view schematic diagram of a grinding downhole cutter for oil production tubing;

[0030] Figure 5 Another partial perspective schematic diagram of a grinding downhole cutter for oil production tubing;

[0031] Figure 6 for Figure 5 The enlarged schematic diagram of point B in the middle;

[0032] Figure 7 It is a partial cross-sectional structural schematic diagram of a grinding downhole cutter for oil production tubing;

[0033] Figure 8 The present invention is another partial cross-sectional structural schematic diagram of a grinding downhole cutter for oil production tubing.

[0034] Figure numerals: 100, clamping mechanism; 101, shell one; 1011, shell two; 1012, push ring; 1013, threaded ring; 1014, ball nut; 1015, threaded connecting rod; 1016, return spring; 1017, ball screw; 1018, limit ring; 1019, electromagnetic clutch; 1020, leg opening motor; 102, connecting arc plate; 103, first inner shell; 104, second inner shell; 105, anchoring assembly; 1051, anchoring leg one; 1052, anchoring leg two ; 1053, limit ring; 1054, connecting piece; 1055, disc spring; 1056, driving piece; 1057, pin; 1058, slider; 1059, support rod; 200, cutting mechanism; 201, cutter head body; 202, push rod; 203, grinding cutter head; 204, feed rod; 205, feed spring; 2051, retaining ring; 2052, connecting shaft; 2053, connecting screw; 2054, resistance spring; 2055, reducer; 2056, cutting motor; 300, power supply. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Example 1

[0037] See also Figure 1-Figure 8 This embodiment provides a grinding downhole cutter for oil production tubing, comprising:

[0038] The clamping mechanism 100 includes a housing 101, an anchoring assembly 105 and a first driving assembly;

[0039] The anchoring assembly 105 is movably arranged on the housing 101 and is used to fasten the housing 101 to the inner wall of the underground pipeline. The first driving assembly is fixed in the housing 101 and is used to drive the anchoring assembly 105 to open or close.

[0040] The cutting mechanism 200 includes a housing 1011, a cutter head body 201, a grinding cutter head 203, a blade, a feed assembly and a second drive assembly;

[0041] The cutter head body 201 is installed on the shell 1011, and the grinding cutter head 203 is installed on the cutter head body 201 through a pin; a V-shaped groove is provided on the grinding cutter head 203, the blade is located in the V-shaped groove and is fastened to the grinding cutter head 203 through a top screw and a nut, the second drive assembly is located in the shell 1011 and is used to drive the cutter head body 201 to cut the downhole pipeline, and the feed assembly is located in the shell 1011 and is used to link the grinding cutter head 203 on the cutter head body 201 to open when the anchor assembly 105 is opened.

[0042] A power supply 300, the power supply 300 is located at one end of the propulsion rod 202 and is used to provide power for the propulsion rod 202;

[0043] Shell 1 101: serves as the main bearing structure of the clamping mechanism 100 and provides a mounting base for the anchoring assembly 105 and the first driving assembly.

[0044] Anchoring assembly 105: It is movably arranged on the housing 101, and uses a plurality of deployable anchoring legs to closely contact the inner wall of the underground pipe to achieve fixation. The opening and closing of the anchoring legs are controlled by the first driving assembly.

[0045] The first driving assembly usually includes a motor, a transmission mechanism, and a spring or a hydraulic device, and is used to provide power to drive the anchor assembly 105 to expand and retract.

[0046] Cutting mechanism 200:

[0047] Shell 2 1011: serves as the main bearing structure of the cutting mechanism 200 and is fixedly connected or detachably connected to shell 1 101 by bolts.

[0048] The cutter head body 201 is installed on the shell 1011 and is the installation platform for the grinding cutter head 203 and the blade.

[0049] Grinding cutter head 203: It is mounted on the cutter head body 201 through a pin. The V-groove thereon is used to accommodate the blade, and is fastened by a top screw and a nut to ensure that the blade will not fall off or shift during the cutting process.

[0050] Blade: Located in the V-groove of the grinding head 203, it is the part that actually performs the cutting operation.

[0051] Feeding assembly: located in the second housing 1011, linked with the opening action of the anchoring assembly 105, driving the cutter head body 201 and the grinding cutter head 203 thereon to perform fine adjustment or opening through the push rod 202 to adapt to pipes of different diameters or shapes.

[0052] The second driving assembly includes a reducer 2055 and a cutting motor 2056, which provide rotational power for the cutter head body 201, drive the grinding cutter head 203 and the blade thereon to rotate, and realize cutting of the underground pipeline.

[0053] Clamping process:

[0054] When the abrasive downhole cutter is sent into the downhole pipe and reaches the predetermined position, the first drive assembly is started, driving the anchor assembly 105 to unfold, so that the anchor legs are in close contact with and fixed to the inner wall of the pipe, thereby firmly fixing the shell 101 and the entire abrasive downhole cutter in the pipe.

[0055] Cutting preparation:

[0056] As the anchor assembly 105 is fixed, the feed assembly senses the open state of the anchor assembly 105, and links the cutter head body 201 and the grinding cutter head 203 thereon to perform fine adjustment or full opening, ensuring that the blade maintains an appropriate cutting angle and contact force with the inner wall of the pipe.

[0057] Cutting operation:

[0058] The second drive assembly is started to drive the cutter head body 201 to rotate, thereby driving the grinding cutter head 203 and the blade to rotate to cut the underground pipe. The feed assembly is also responsible for controlling the feed speed of the blade to ensure a smooth and efficient cutting process.

[0059] Completion and Recycling:

[0060] After the cutting is completed, the first driving assembly is started again to drive the anchor assembly 105 to retract and release the fixation on the inner wall of the pipe. The cutter can then be recovered or moved to the next cutting position for operation.

[0061] Example 2

[0062] Based on Example 1, please refer to Figure 1-Figure 8 ;

[0063] The anchor assembly 105 includes a connecting piece 1054 arranged on the shell 101, an anchor leg 1051 is fixedly provided on the connecting piece 1054, an anchor leg 1052 is hingedly provided on the anchor leg 1051, one end of the anchor leg 1052 is provided with a limiting ring 1053 through the rotation of the transmission shaft, and the limiting ring 1053 is slidably connected to the connecting piece 1054 through a sliding groove.

[0064] The first driving assembly includes a driving member 1056 arranged at one end of the connecting member 1054, and a disc spring 1055 is sleeved at the connection between the connecting member 1054 and the driving member 1056. A slider 1058 and a support rod 1059 are respectively provided at both ends of the disc spring 1055. The slider 1058 is provided with a pin 1057 for limiting the position of the slider 1058.

[0065] The feed assembly includes a feed rod 204, which is located in the shell 101 and one end of the feed rod 204 is provided with a connecting shaft 2052, and a resistance spring 2054 is sleeved on the circumference of the connecting shaft 2052. The feed rod 204 maintains a certain pressure under the action of the connecting shaft 2052 and keeps the blade in close contact with the object to be cut. When the connecting shaft 2052 rotates at high speed, the grinding head 203 and the blade also rotate accordingly; the preload force of the resistance spring 2054 can be adjusted.

[0066] The second driving assembly includes a reducer 2055 disposed at one end of the connecting shaft 2052, and a cutting motor 2056 is disposed at one end of the reducer 2055;

[0067] It also includes a retaining ring 2051 and a connecting screw 2053 which are arranged at both ends of the resistance spring 2054 and are used to assist the resistance spring 2054 in sliding or resetting.

[0068] The grinding heads 203 are evenly distributed on the circumference of the head body 201, and the grinding heads 203 are clamped on the feed rod 204, and the feed rod 204 is closely connected with the retaining ring 2051 through the feed spring 205. The second housing 1011 is connected with the threaded ring 1013 through a thread, and the retaining ring 2051 is clamped in the groove of the threaded ring 1013. The second housing 1011 and the threaded ring 1013 are connected through a thread, and the movement of the feed rod 204 drives the grinding heads 203 to rotate around the pin.

[0069] The device also includes a leg-opening motor 1020, which is transmission-connected to an electromagnetic clutch 1019, and the electromagnetic clutch 1019 is transmission-connected to a ball screw 1017. A limit ring 1018 is provided on the outer side of the ball screw 1017 and is used to limit the travel distance of the ball screw 1017. The ball screw 1017 is threadedly connected to a ball nut 1014, and the ball nut 1014 is threadedly connected to a propulsion rod 202, and the propulsion rod 202 is screwed to a push ring 1012. A threaded connecting rod 1015 is provided in the housing 101 and is used to push the cutter head body 201 out, and a reset spring 1016 is provided on the outer peripheral surface of the threaded connecting rod 1015 and is used to assist in resetting the threaded connecting rod 1015.

[0070] The threaded ring 1013 is connected to the housing 1 101 and the housing 2 1011 respectively through threads, and the housing 1 101 and the housing 2 1011 are firmly connected to the support rod 1059 through the pin 1057.

[0071] The device also includes a supporting shell, and a slider 1058, a cylindrical pin 1, a cylindrical pin 2 and a fixing block are provided at the front end of the disc spring 1055. The slider 1058 is fastened to the fixing block by screws; the slider 1058 is connected to the anchor leg 1 1051 by the cylindrical pin 1, and the anchor leg 1 1051 is tightly connected to one end of the anchor leg 2 1052 by the cylindrical pin 2. The other end of the anchor leg 2 1052 is connected to the supporting shell by the cylindrical pin 2, so as to form two anchoring structures with the same structure and symmetrical distribution.

[0072] There are multiple grinding heads 203 , and the multiple grinding heads 203 are evenly distributed in a circle along the center of the head body 201 .

[0073] The anchoring assembly 105 includes: a connecting piece 1054: fixed on the shell 101, serving as an installation basis for the anchoring leg 1 1051 and the anchoring leg 2 1052.

[0074] Anchoring leg 1051 and anchoring leg 2 1052 are hinged to each other to form an expandable anchoring structure. One end of anchoring leg 2 1052 is connected to limiting collar 1053 through a transmission shaft, and limiting collar 1053 slides on connecting member 1054 through a slide slot to realize the expansion and contraction of the anchoring leg.

[0075] Disc spring 1055: It is sleeved between the connecting member 1054 and the driving member 1056 to provide elastic force for the deployment of the anchoring leg. The two ends of the disc spring 1055 are respectively provided with a slider 1058 and a support rod 1059. The slider 1058 is limited in position by a pin 1057 to ensure that the disc spring 1055 remains stable during compression and release.

[0076] The first driving assembly includes: a driving member 1056 : usually a motor or a hydraulic cylinder, which provides power to drive the anchor assembly 105 to expand and retract.

[0077] The disc spring 1055, the slider 1058 and the support rod 1059 together constitute a part of the driving mechanism. Through the interaction between the elastic force of the disc spring 1055 and the driving force of the driving member 1056, the anchoring leg can be quickly deployed and smoothly retracted.

[0078] The feeding assembly includes: a feed rod 204: connected to a resistance spring 2054 via a connecting shaft 2052, maintaining a certain pressure so that the blade is in close contact with the object to be cut.

[0079] Resistance spring 2054: provides feed pressure and can adapt to different cutting requirements by adjusting the preload force.

[0080] The retaining ring 2051 and the connecting screw 2053 assist the sliding or resetting of the resistance spring 2054 to ensure the smooth progress of the feeding process.

[0081] The second driving assembly includes: a reducer 2055 and a cutting motor 2056: the speed of the cutting motor 2056 is reduced and the torque is increased by the reducer 2055, so as to drive the connecting shaft 2052, the grinding head 203 and the blade to rotate, thereby realizing the cutting operation.

[0082] Other structures: the leg opening motor 1020, the electromagnetic clutch 1019, the ball screw 1017, the ball nut 1014, the push rod 202, etc.: constitute another set of driving system, which is used to control the feeding or retraction of the push rod 202, and is used to adjust the cutting depth or assist the deployment of the anchor assembly 105. The outer peripheral surface of the electromagnetic clutch 1019 is provided with a first inner shell 103 for protecting the electromagnetic clutch 1019, and the outer side of the leg opening motor 1020 is provided with a second inner shell 104 for protecting the leg opening motor 1020. One end of the first inner shell 103 is connected to a connecting arc plate 102 for limiting the position of the reset spring 1016.

[0083] Threaded ring 1013: connected to housing 1 101 and housing 2 1011 respectively through threads, playing the role of connection and support.

[0084] When the cutter is sent into the underground pipeline and reaches the predetermined position, the leg opening motor 1020 is started, and the transmission mechanism such as the electromagnetic clutch 1019 and the ball screw 1017 drives the anchor leg 1 1051 and the anchor leg 2 1052 to unfold, so that the anchor leg is in close contact with the inner wall of the pipeline. At the same time, the disc spring 1055 is compressed and stores energy. With the anchor assembly 105 fixed, the feed assembly starts to work. The resistance spring 2054 provides the feed pressure, so that the feed rod 204 drives the grinding head 203 and the blade to approach the object to be cut and maintain a certain contact pressure. The cutting motor 2056 is started, and the connecting shaft 2052 is driven to rotate through the reducer 2055, thereby driving the grinding head 203 and the blade to rotate and cut the underground pipeline. The feed assembly may automatically adjust the feed amount according to the cutting progress to maintain the cutting efficiency and quality. After the cutting is completed, the leg opening motor 1020 rotates in the opposite direction or drives the anchor leg to close by other means to release the fixation on the inner wall of the pipeline. The cutter can then be retrieved or moved on to the next cutting position for operation.

[0085] Example 3

[0086] Based on Example 1 and Example 2, please refer to Figure 1-Figure 8 ,

[0087] Updates to Anchor Assembly 105:

[0088] Replace the original disc spring 1055 and slide block 1058 to form a pneumatic or hydraulic drive system. The system includes a cylinder (or hydraulic cylinder) and a piston, and drives the deployment and folding of the anchoring legs by controlling the air pressure (or hydraulic pressure).

[0089] The basic structure of the connecting member 1054, the first anchoring leg 1051 and the second anchoring leg 1052 is retained, but the design of the hinge point and the connecting axis is optimized to improve stability and durability.

[0090] Updates to feed components:

[0091] A ball screw mechanism driven by a servo motor is introduced to replace the original resistance spring 2054 and feed spring 205. The servo motor can accurately control the feed speed and feed amount, thereby improving the cutting accuracy.

[0092] The feed rod 204 and the connecting shaft 2052 are retained, but are connected to a ball screw mechanism driven by a servo motor to achieve precise feeding.

[0093] Optimization of the second drive component:

[0094] Maintain the basic configuration of the reducer 2055 and the cutting motor 2056, but consider using a higher efficiency motor and reducer combination to improve cutting efficiency and power output.

[0095] Other structural optimizations:

[0096] The design of the threaded ring 1013 is simplified by using a stronger and easier to process material, such as stainless steel or alloy steel.

[0097] The connection method between the housing 1 101 and the housing 2 1011 is optimized to ensure sealing and stability.

[0098] How it works after the update:

[0099] Anchor assembly 105: The pneumatic (or hydraulic) drive system drives the piston movement by controlling the air pressure (or hydraulic pressure), thereby driving the deployment and folding of anchor leg 1 1051 and anchor leg 2 1052. The design of the hinge point and the connecting axis ensures that the anchor legs remain stable during the deployment and folding process.

[0100] When the cutter needs to be fixed, the pneumatic (or hydraulic) system is activated to push the piston outward, driving the anchor legs to expand and close to the inner wall of the pipe. After the cutting is completed, the system reverses the operation to retract the anchor legs and release the fixation on the inner wall of the pipe.

[0101] Feed assembly: The ball screw mechanism driven by the servo motor realizes the linear motion of the feed rod 204 by precisely controlling the rotation of the ball screw 1017. The high-precision control of the servo motor ensures the accuracy of the feed speed and feed amount.

[0102] During the cutting process, the servo motor adjusts the rotation speed and direction of the ball screw 1017 according to the preset cutting parameters or the real-time feedback of the cutting state, thereby controlling the feed speed and feed amount of the feed rod 204. The movement of the feed rod 204 drives the grinding head 203 and the blade to maintain close contact with the object to be cut, and achieves precise cutting.

[0103] The second driving component: The high-efficiency motor drives the connecting shaft 2052 to rotate through the reducer 2055, thereby driving the grinding head 203 and the blade to rotate to perform cutting operations.

[0104] After the cutting motor 2056 is started, the speed of the motor is reduced to a suitable range through the reducer 2055, and the torque output is increased. The connecting shaft 2052 rotates under the drive of the motor, driving the grinding head 203 and the blade to rotate at a high speed to achieve cutting of the underground pipeline.

[0105] Other structures: Threaded ring 1013: uses a stronger material and an optimized design to ensure that the connection between shell 1 101 and shell 2 1011 is stable and reliable.

[0106] By optimizing the connection mode and layout between the various components, the compactness and stability of the overall structure are improved, ensuring the safety and reliability of the cutter during underground operations.

[0107] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the system is only a logical function division. There may be other division methods in actual implementation. For example, multiple systems or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0108] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A grinding downhole cutter for oil production tubing, characterized in that: include: A clamping mechanism (100) comprising a housing (101), an anchoring assembly (105) and a first driving assembly; The anchoring assembly (105) is movably mounted on the housing (101) and is used to fix the housing (101) to the inner wall of the downhole pipeline; the first driving assembly is fixedly mounted in the housing (101) and is used to drive the anchoring assembly (105) to open or close; The cutting mechanism (200) comprises a second housing (1011), a cutter head body (201), a grinding cutter head (203), a blade, a feeding assembly and a second driving assembly; The cutter head body (201) is mounted on the second shell (1011), and the grinding cutter head (203) is mounted on the cutter head body (201) by means of a pin; a V-shaped groove is provided on the grinding cutter head (203), the blade is located in the V-shaped groove and is fastened to the grinding cutter head (203) by means of a top screw and a nut; the second drive assembly is located in the second shell (1011) and is used to drive the cutter head body (201) to cut the downhole pipeline; the feed assembly is located in the second shell (1011) and is used to link the grinding cutter head (203) on the cutter head body (201) to open when the anchor assembly (105) is opened.

2. A grinding downhole cutter for oil production tubing according to claim 1, characterized in that: The anchor assembly (105) comprises a connecting piece (1054) arranged on the shell (101), the connecting piece (1054) is fixedly provided with an anchor leg (1051), the anchor leg (1051) is hingedly provided with an anchor leg (1052), one end of the anchor leg (1052) is provided with a limiting ring (1053) which is rotatable through a transmission shaft, and the limiting ring (1053) is slidably connected to the connecting piece (1054) through a sliding groove.

3. A grinding downhole cutter for oil production tubing according to claim 2, characterized in that: The first driving assembly comprises a driving member (1056) arranged at one end of a connecting member (1054); a disc spring (1055) is sleeved at the connection between the connecting member (1054) and the driving member (1056); a slider (1058) and a support rod (1059) are respectively arranged at both ends of the disc spring (1055); and a pin (1057) for limiting the position of the slider (1058) is arranged on the slider (1058).

4. A grinding downhole cutter for oil production tubing according to claim 3, characterized in that: The feed assembly comprises a feed rod (204), the feed rod (204) being located in a housing (101) and a connecting shaft (2052) being provided at one end of the feed rod (204), a resistance spring (2054) being sleeved on the circumferential surface of the connecting shaft (2052), the feed rod (204) maintaining a certain pressure under the action of the connecting shaft (2052) and enabling the blade to always maintain close contact with the object to be cut, and when the connecting shaft (2052) rotates, the grinding head (203) and the blade also rotate accordingly; the preload force of the resistance spring (2054) can be adjusted.

5. A grinding downhole cutter for oil production tubing according to claim 4, characterized in that: The second driving assembly comprises a reducer (2055) arranged at one end of the connecting shaft (2052), and a cutting motor (2056) is arranged at one end of the reducer (2055); It also includes a retaining ring (2051) and a connecting screw (2053) which are arranged at both ends of the resistance spring (2054) and are used to assist the resistance spring (2054) in sliding or resetting.

6. A grinding downhole cutter for oil production tubing according to claim 5, characterized in that: The grinding heads (203) are evenly distributed on the circumference of the head body (201), and the grinding heads (203) are clamped on the feed rod (204). The feed rod (204) is tightly connected to the retaining ring (2051) through a feed spring (205); the shell body (1011) is connected with a threaded ring (1013) through a thread, and the retaining ring (2051) is clamped in the groove of the threaded ring (1013). The movement of the feed rod (204) drives the grinding heads (203) to rotate around the pin.

7. A grinding downhole cutter for oil production tubing according to claim 6, characterized in that: It also includes a leg-opening motor (1020), the leg-opening motor (1020) is transmission-connected to an electromagnetic clutch (1019), the electromagnetic clutch (1019) is transmission-connected to a ball screw (1017), the ball screw (1017) is threadedly connected to a ball nut (1014), the ball nut (1014) is threadedly connected to a propulsion rod (202), and the propulsion rod (202) is screwed to a push ring (1012).

8. A grinding downhole cutter for oil production tubing according to claim 7, characterized in that: The threaded ring (1013) is connected to the housing 1 (101) and the housing 2 (1011) respectively through threads, and the housing 1 (101) and the housing 2 (1011) are both firmly connected to the support rod (1059) through the pin (1057).

9. The grinding downhole cutter for oil production tubing according to claim 3, characterized in that: It also includes a supporting shell, and one end of the disc spring (1055) is provided with a slider (1058), a cylindrical pin 1, a cylindrical pin 2 and a fixed block, and the slider (1058) is fastened to the fixed block by screws; the slider (1058) is connected to the anchor leg 1 (1051) by the cylindrical pin 1, and the anchor leg 1 (1051) is tightly connected to one end of the anchor leg 2 (1052) by the cylindrical pin 2; the other end of the anchor leg 2 (1052) is connected to the supporting shell by the cylindrical pin 2, so as to form two anchoring structures with the same structure and symmetrical distribution.

10. The grinding downhole cutter for oil production pipe according to claim 4, characterized in that: The grinding blade heads (203) are provided in plurality, and the plurality of grinding blade heads (203) are evenly distributed in a circular pattern along the center of the blade head body (201).

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