A heavy-duty electric push-pull tool

Abstract

The present invention discloses a heavy-duty electric push-pull tool, including a power input unit, a power conversion unit and a power output unit; through the transmission design of the multi-stage reducer and the planetary roller screw of the downhole working tool, the low-speed and high-torque power output of the motor output power is realized. The heavy-duty push-pull tool provided by the present invention can provide both a large-torque thrust and a large-torque pulling force; the forward direction of the transmission nut is based on the rotation direction of the motor, and by controlling the forward or reverse rotation of the motor drive shaft, the forward or backward movement of the working tool can be achieved at a low cost through power transmission; compared with the existing setting tools, the present invention cooperates with working tools adapted to specific scenarios, which greatly expands the operating range of downhole tools.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas downhole operation tools and relates to a heavy-load electric push-pull tool. Background Art

[0002] At present, in the development of oil and gas wells, the use of bridge plugs or packers to segment the reservoir and transform the reservoir is the main means of increasing production in unconventional oil and gas fields. To correctly set the bridge plug or packer at the preset position downhole, a setting tool is required. There are two main types of setting tools on the market, one is the Explosive Setting Tool, and the other is the Non-explosive Setting Tool.

[0003] The main working principle of the pyrotechnic sealing tool is: the slow-burning gunpowder (Power Charge) is ignited by the primary igniter (Primary igniter) and the secondary gunpowder (Secondary Igniter), and the slow-burning gunpowder column burns to produce gas, and the gas forms high-pressure gas in the confined space. The high-pressure gas pushes the piston, and the hydraulic oil at the other end enters the next-level cylinder through the small hole in the middle joint; there is a piston in the cylinder, and after the hydraulic oil pushes the piston, the push rod connected to the piston moves with the piston to push the adapter; the adapter produces permanent or temporary deformation on the bridge plug or the packer; using the deformation, the bridge plug or the packer is fixed on the inner casing of the casing, and the sealing is achieved by squeezing the sealing rubber or the variable diameter metal ring.

[0004] Powder setting tools have the following disadvantages:

[0005] 1) Control and use of pyrotechnics: pyrotechnics are controlled items (including detonators and gunpowder), and there are safety hazards in the transportation and storage of pyrotechnics. In addition, during the use of pyrotechnics, there may be a risk of explosion due to improper operation of technicians, causing injuries and disabilities, which will cause great safety hazards to both enterprises and individuals.

[0006] 2) Product quality of explosives: The power and effect of explosives are related to environmental factors. If the explosives are damp during storage, the power of their combustion and explosion will be greatly reduced. If they are not stored properly or in a bad underground environment, the explosives will also be damp, thus affecting the construction progress.

[0007] 3) The thrust brought by pyrotechnics is limited: The thrust brought by gunpowder combustion is limited. For example, the maximum thrust of the Baker 20 setting tool is 24 tons. Moreover, the energy efficiency of gunpowder will be greatly reduced if affected by the environment. If special circumstances are encountered, such as casing subsidy, the thrust brought by the gunpowder setting tool cannot be met.

[0008] 4) Design defects of the gunpowder setting tool; Since the gunpowder setting tool uses a slow-burning gunpowder column to provide thrust, there must be a gas release port and a pressure relief port after the gunpowder setting tool is raised from the wellhead. This pressure relief port has two hidden dangers. First, before the setting tool is used, if the pressure relief screw and the sealing ring of the pressure relief port are not installed in place; after the tool is put into the well, the external pressure in the wellbore may enter the tool, push the piston in the first-stage oil cylinder, and make the setting tool work in advance, resulting in the early setting or semi-setting (Pre-Setting) of the bridge plug / packer. Second, after the gunpowder setting tool is used, it is necessary to perform pressure relief work on the ground to discharge the high-pressure gas generated by the combustion of the slow-burning gunpowder column out of the tool, and then disassemble and maintain the tool. During the pressure relief process on the ground, due to the different proficiency of the operators, there is a possibility of high-pressure gas injury accidents.

[0009] 5) The maintenance cycle of the gunpowder setting tool is short, and maintenance is required after each use. Each maintenance usually takes 20-40 minutes, which is time-consuming and laborious.

[0010] As for hydraulic setting tools, there are several disadvantages: a) When the hydraulic pump is working under high pressure, there is a risk of high-pressure leakage, so the service life of the hydraulic pump is short. b) Although the maintenance cycle has been greatly improved compared with the gunpowder setting tool, the maintenance frequency is still slightly higher than that of the electric setting tool. c) Hydraulic setting tools are not suitable for wireline operations; d) They need to rely on a certain amount of external pressure. If the pressure in the wellbore is 0, the use effect is not good. Summary of the invention

[0011] The technical problem solved by the present invention is to provide a heavy-duty electric push-pull tool, which can generate high-torque thrust or pull force in oil and gas wells and is safe and reliable to use.

[0012] The present invention is achieved through the following technical solutions:

[0013] A heavy-duty electric push-pull tool comprises a power input unit, a power conversion unit and a power output unit;

[0014] The power input unit includes a motor connected to an external power source, and the motor output shaft is connected to the power conversion unit through a coupling;

[0015] The power conversion unit includes a reducer arranged in a reducer housing, and the reducer is provided with a multi-stage planetary reducer; the planetary reducer includes a sun gear, a planetary disk, a planetary carrier and a plurality of planetary gears, the planetary gears are meshed with gear grooves provided on the inner wall of the reducer housing, the sun gear is fixed on a sun gear transmission shaft or a planetary disk, and a clearance control shaft coaxial with the sun gear transmission shaft is provided between the planetary disks; the power is input from the sun gear transmission shaft to the first-stage planetary reducer, and is output from the planetary carrier of the last-stage planetary reducer to the reducer output shaft;

[0016] The power output unit includes a power output housing with a guide rail on the inner wall, and a planetary roller screw is arranged inside the housing; the planetary roller screw includes a screw and a transmission nut, and a plurality of planetary rollers are arranged inside the transmission nut. The screw is connected to the output shaft of the reducer through a spline connecting sleeve, and the transmission nut is also connected to a guide flat key embedded in the guide rail; the hollow connecting sleeve is fixedly connected to the transmission nut, and moves axially under the drive of the transmission nut to provide thrust or pulling force for the working tool.

[0017] Furthermore, the motor output shaft is connected to the sun gear transmission shaft through a coupling, a bearing group consisting of a deep groove ball bearing and a thrust bearing is provided between the sun gear transmission shaft and the reducer, and a pressure ring is also provided between the bearing group and the reducer;

[0018] There are clearance control shafts between adjacent planetary discs. Both end faces of the clearance control shafts are spherical curved surfaces. The end face of the sun gear transmission shaft is also a spherical curved surface. The contact between the sun gear transmission shaft and the clearance control shaft, and between the clearance control shafts, is point contact.

[0019] A ball bearing group is also arranged between the reducer output shaft and the reducer.

[0020] Furthermore, one end of the spline connection sleeve is connected to the output shaft of the reducer through a spline; the other end is inserted into the lead screw, and a stop ring is provided on the spline connection sleeve;

[0021] Both ends of the transmission nut are provided with grooves adapted to one side of the guide flat key, one side of the guide flat key is placed in the groove, and the other side is placed in the guide rail;

[0022] The transmission nut is connected to the hollow connecting sleeve through threads and fixed by a fixing piece.

[0023] Furthermore, the spline connection sleeve is provided with a fixing ring on the outside, a thrust bearing and a bearing gasket are provided on one side, and a screw clamp key is inserted between the thrust bearing and the screw for fixing; a thrust bearing, a spline fixing bearing and a spline fixing ring are provided on the other side;

[0024] The end of the screw is inserted into an oil-free bushing and fixed with a stop ring;

[0025] Anti-collision pads are respectively arranged at both ends of the guide rail in the power output housing.

[0026] The power transmission of the power input unit, the power conversion unit and the power output unit is:

[0027] The power generated by the motor is transmitted to the sun gear drive shaft through the motor output shaft and coupling, and the power is transmitted to the power conversion unit;

[0028] The sun gear transmission shaft drives the sun gear of the first stage reducer to rotate, which in turn drives the planetary gear meshing with the reducer housing to rotate. The movement of the planetary gear drives the planetary disk of the next stage reducer to rotate, and the planetary disk drives the sun gear fixed on it to rotate. Each time the power is transmitted through a stage reducer, the power torque increases accordingly. When the power is transmitted to the last stage planetary reducer, the planetary gear rotates through the planet carrier to drive the reducer output shaft to rotate, providing low-speed, high-torque power output.

[0029] The output shaft of the reducer is connected to the spline connection sleeve through a spline, and the power is transmitted to the power output unit; the lead screw receives the torque provided by the spline connection sleeve and rotates, driving the transmission nut to move axially. Under the guidance of the guide flat key, the transmission nut only moves axially on the lead screw along the guide rail;

[0030] The forward direction of the transmission nut is based on the rotation direction of the motor. The positive or reverse rotation of the motor drive shaft drives the transmission nut forward or backward through power transmission;

[0031] The hollow connecting sleeve is provided with a plurality of working tool connection interfaces, and the working tool is fixedly connected to the hollow connecting sleeve; the hollow connecting sleeve fixedly connected to the transmission nut moves axially under the drive of the transmission nut, exerting axial pulling force or thrust on the working tool.

[0032] Furthermore, the motor is also connected to a motor control unit, which includes a control module, and a communication module, a collection module, a motor drive module and a power supply module connected thereto;

[0033] The communication module is used for real-time communication between the motor control unit and the external control panel;

[0034] The control module receives control signals from the external control panel through the communication module, sends instructions to each module, and feeds back motor operation parameters to the external control panel;

[0035] The acquisition module collects the operating parameters including the motor speed, direction, voltage and current in real time and sends them to the control module;

[0036] The motor drive module receives instructions from the control module and adjusts the motor operating parameters;

[0037] The power supply module converts the power supply voltage into the working voltage required by each module and motor.

[0038] Furthermore, the control module can obtain the relative positions of the transmission nut and the hollow connecting sleeve based on the motor speed and the lead of the screw; when the transmission nut and the hollow connecting sleeve move to the set position, the control module sends a command to the motor drive module and the motor stops working.

[0039] The motor is placed in the motor cushioning sleeve, and both ends of the outer wall of the motor cushioning sleeve are provided with sealing ring grooves, and the sealing ring of the motor cushioning sleeve is placed therein;

[0040] The motor and the motor damping sleeve are placed in the power input housing, and the motor is connected to the power input housing through the motor fixing hole and the fixing piece;

[0041] A sealing ring groove is provided on the power input housing, and a sealing ring of the power input housing is placed therein.

[0042] Compared with the prior art, the present invention has the following beneficial technical effects:

[0043] The heavy-duty push-pull tool provided by the present invention realizes low-speed and high-torque power output of the motor output power through the multi-stage reducer and the planetary roller screw transmission design of the downhole operation tool; the tool with an outer diameter of 96mm can output a push-pull force of 30 tons; the tool with an outer diameter of 76mm can output a push-pull force of 19 tons; the tool with an outer diameter of 56mm can output a push-pull force of 13 tons; the power output of downhole electric operation is greatly improved, and a downhole electric operation tool with high reliability and high torque is provided.

[0044] The heavy-load push-pull tool provided by the present invention can provide both high-torque thrust and high-torque pulling force; the forward direction of the transmission nut is based on the rotation direction of the motor, and by controlling the forward or reverse rotation of the motor drive shaft, the forward or backward movement of the working tool can be achieved at a low cost through power transmission; compared with existing sealing tools, the present invention is combined with working tools that are adapted to specific scenarios, which greatly expands the operating range of downhole tools.

[0045] The heavy-duty push-pull tool provided by the present invention is designed to be earthquake-resistant in order to meet the earthquake-resistant requirements of frequent vibrations in bridge-shooting operation. The reducer in the power conversion unit and the planetary roller screw in the power output unit are designed to be earthquake-resistant, which can ensure the stability and reliability of the instrument and greatly improve the tool maintenance cycle. The heavy-duty push-pull tool of the present invention only needs maintenance after completing 200 downhole operations. Compared with the existing sealing tools that need maintenance after 30 downhole operations, the maintenance cycle is greatly improved and the maintenance cost is greatly reduced. Furthermore, the present invention can ensure that the vibration generated by the explosion of the perforating bullets during the bridge-shooting operation does not cause damage to the instrument by designing a buffer space between the gap control shafts and anti-collision pads. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural schematic diagram of the power input unit of the present invention;

[0047] Figure 2 is a top view schematic diagram of a power input unit of the present invention;

[0048] Figure 3 It is a schematic diagram of a reducer of a power conversion unit of the present invention;

[0049] Figure 4 It is a schematic diagram of the reducer housing of the power conversion unit of the present invention;

[0050] Figure 5 This is one of the schematic diagrams of the reducer sun gear structure of the present invention;

[0051] Figure 6 This is the second schematic diagram of the structure of the sun gear of the reducer of the present invention;

[0052] Figure 7 is a cross-sectional view of the reducer of the present invention;

[0053] Figure 8 is a cross-sectional view of a power output unit of the present invention;

[0054] Fig. 9 This is one of the schematic diagrams of the housing of the power output unit of the present invention;

[0055] Fig.10 The second schematic diagram of the housing of the power output unit of the present invention;

[0056] Fig.11 It is a schematic cross-sectional view of the housing of the power output unit of the present invention. DETAILED DESCRIPTION

[0057] The present invention is further described in detail below in conjunction with the embodiments, which are intended to explain the present invention rather than to limit it.

[0058] The present invention provides a heavy-duty electric push-pull tool, which mainly includes a power input unit, a power conversion unit and a power output unit; they are respectively encapsulated in a shell from top to bottom, one end of the shell is connected to a perforating gun through an upper end joint, and the other end is connected to a bridge plug / packer through an adapter. The present invention can be used as a setting tool; or connected with other downhole operation tools, it can be used as a drilling operation tool or a well wall coring operation tool;

[0059] The power input unit includes a motor connected to an external power source, and the motor output shaft is connected to the power conversion unit through a coupling;

[0060] The power conversion unit includes a reducer arranged in a reducer housing, and the reducer is provided with a multi-stage planetary reducer; the planetary reducer includes a sun gear, a planetary disk, a planetary carrier and a plurality of planetary gears, the planetary gears are meshed with gear grooves provided on the inner wall of the reducer housing, the sun gear is fixed on a sun gear transmission shaft or a planetary disk, and a clearance control shaft coaxial with the sun gear transmission shaft is provided between the planetary disks; the power is input from the sun gear transmission shaft to the first-stage planetary reducer, and is output from the planetary carrier of the last-stage planetary reducer to the reducer output shaft;

[0061] The power output unit includes a power output housing with a guide rail on the inner wall, and a planetary roller screw is arranged inside the housing; the planetary roller screw includes a screw and a transmission nut, and a plurality of planetary rollers are arranged inside the transmission nut. The screw is connected to the output shaft of the reducer through a spline connecting sleeve, and the transmission nut is also connected to a guide flat key embedded in the guide rail; the hollow connecting sleeve is fixedly connected to the transmission nut, and moves axially under the drive of the transmission nut to provide thrust or pulling force for the working tool.

[0062] Furthermore, the power transmission of the power input unit, the power conversion unit and the power output unit is:

[0063] The power generated by the motor is transmitted to the sun gear drive shaft through the motor output shaft and coupling, and the power is transmitted to the power conversion unit;

[0064] The sun gear transmission shaft drives the sun gear of the first stage reducer to rotate, which in turn drives the planetary gear meshing with the reducer housing to rotate. The movement of the planetary gear drives the planetary disk of the next stage reducer to rotate, and the planetary disk drives the sun gear fixed on it to rotate. Each time the power is transmitted through a stage reducer, the power torque increases accordingly. When the power is transmitted to the last stage planetary reducer, the planetary gear rotates through the planet carrier to drive the reducer output shaft to rotate, providing low-speed, high-torque power output.

[0065] The output shaft of the reducer is connected to the spline connection sleeve through a spline, and the power is transmitted to the power output unit; the lead screw receives the torque provided by the spline connection sleeve and rotates, driving the transmission nut to move axially. Under the guidance of the guide flat key, the transmission nut only moves axially on the lead screw along the guide rail;

[0066] The forward direction of the transmission nut is based on the rotation direction of the motor. The positive or reverse rotation of the motor drive shaft drives the transmission nut forward or backward through power transmission;

[0067] The hollow connecting sleeve is provided with a plurality of working tool connection interfaces, and the working tool is fixedly connected to the hollow connecting sleeve; the hollow connecting sleeve fixedly connected to the transmission nut moves axially under the drive of the transmission nut, exerting axial pulling force or thrust on the working tool.

[0068] Furthermore, in order to enhance the precise control of the heavy-duty electric push-pull tool, the motor is also connected to a motor control unit, which includes a control module, and a communication module, a collection module, a motor drive module and a power supply module connected thereto;

[0069] The communication module is used for real-time communication between the motor control unit and the external control panel;

[0070] The control module receives control signals from the external control panel through the communication module, sends instructions to each module, and feeds back motor operation parameters to the external control panel;

[0071] The acquisition module collects the operating parameters including the motor speed, direction, voltage and current in real time and sends them to the control module;

[0072] The motor drive module receives instructions from the control module and adjusts the motor operating parameters;

[0073] The power supply module converts the power supply voltage into the working voltage required by each module and motor.

[0074] Each unit will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0075] See also Figure 1 , Figure 2 In the power input unit 100, the power generated by the motor 101 is output through the motor output shaft 109, and the motor output shaft 109 is connected to the sun gear drive shaft in the power conversion unit through the coupling 110 for power transmission.

[0076] Among them, the motor 101 can be a brushless DC motor, which operates in an automatic control mode, so the motor does not need to use variable frequency speed regulation to start under heavy load, and will not oscillate or lose steps due to sudden load changes. Compared with brushed motors, brushless DC motors have higher energy efficiency and lifespan; and brushless motors are also easier to maintain, reducing the frequency and cost of replacing motors.

[0077] An embodiment of the power input unit is given below:

[0078] The power input unit 100 includes a motor 101 , a motor damping sleeve 102 , a power input housing 103 , a motor damping sleeve sealing ring 104 , a power input housing sealing ring 105 , a motor fixing hole 108 , a motor output shaft 109 , a coupling 110 , a flange 111 and fixing screws 112 .

[0079] Wherein, the motor 101 is placed in the motor cushioning sleeve 102;

[0080] The upper and lower ends of the outer wall of the motor cushioning sleeve 102 are provided with sealing ring grooves, and the sealing ring 104 of the motor cushioning sleeve is placed in the sealing ring grooves;

[0081] Put the motor 101 and the motor cushioning sleeve 102 into the power input housing 103, and fix the motor to the power input housing 103 through the flange 111 and the fixing screws 112, as well as the three motor fixing holes 108 and the three fixing screws;

[0082] The power input housing 103 is provided with four sealing ring grooves, and the power input housing sealing rings 105 are sequentially placed into the sealing ring grooves to ensure that both ends of the power input unit are sealed;

[0083] Furthermore, in order to ensure that the motor does not rotate before being started, or to brake when necessary, a brake mechanism 106 is also provided in the power input unit 100; the brake mechanism 106 is placed on the upper end of the motor 101 and is aligned with the brake fixing hole 107, and the brake mechanism 106 is fixed to the motor 101 by screws;

[0084] The brake mechanism is a non-essential component and is mainly for safety considerations; its main function is to stop the motor 101 from rotating and stopping power output when necessary; it can be selected from the many current motor stopping methods.

[0085] The following is a braking implementation method based on electromagnets. When braking, the brake mechanism is adsorbed on the upper end of the motor, and the brake mechanism locks the motor shaft so that it cannot rotate freely; after power is turned on, the magnet changes polarity and bounces up, allowing the motor shaft to rotate freely.

[0086] See also Figure 3-Figure 8 The power conversion unit includes a reducer 200 and a reducer housing 209, which are connected by a reducer upper end fixing bolt and a reducer lower end fixing bolt respectively;

[0087] The reducer 200 includes a multi-stage planetary reducer connected in series. The embodiment of the present invention adopts a five-stage planetary reducer connected in series, wherein the first-stage reducer to the fourth-stage reducer each include a sun gear 201 and three planetary gears 202, and the fifth-stage reducer includes a sun gear 201 and four planetary gears 202; the sun gear 201 of the first-stage reducer is connected to the sun gear transmission shaft 235, and the sun gears 201 of the second-stage reducer to the fifth-stage reducer are connected to the planetary disk;

[0088] The planet carrier is constructed as follows: the planetary wheels of the planetary reducer are all provided with conduction holes 203, and the conduction holes 203 and the planetary disk of the next stage reducer or the output shaft 206 of the reducer are connected through fixing pins; as the planetary wheels move, the planetary disk or output shaft of the next stage is driven to rotate.

[0089] A transmission thrust bearing 232 and two deep groove ball bearings (a first deep groove ball bearing 233 and a second deep groove ball bearing 234) are sequentially provided on the sun gear transmission shaft 235 to fix the position of the sun gear transmission shaft 235 and reduce the friction resistance of the sun gear transmission shaft; and the bearing assembly is fixed to the upper end of the reducer 200 by a pressure ring 231;

[0090] A plurality of coaxial gap control shafts (a first gap control shaft 236, a second gap control shaft 237, and a third gap control shaft 238) are arranged between the planetary disks (a first planetary disk 239, a second planetary disk 240, a third planetary disk 241, and a fourth planetary disk 242) of the reducer; the upper and lower ends of the gap control shafts are both ball head surfaces, and the contact with each other is point contact; compared with surface contact, point contact makes the transmission resistance smaller; and in order to cope with the axial acceleration generated during the perforating explosion, the ball head surface of the gap control shaft is designed to retain a certain gap between the gap control shafts, which can play a buffering role; therefore, the gap control shaft can effectively control the gap between the planetary gear and the planetary disk, while reducing friction, improving transmission efficiency, and reducing power loss.

[0091] The reducer output shaft 206 is connected to the reducer through a ball bearing group (including an upper ball bearing 207 and a lower ball bearing 208).

[0092] The power transmission of the reducer 200 is given below:

[0093] The power output by the motor output shaft 109 is transmitted to the sun gear transmission shaft 235 through the coupling 110;

[0094] First-stage reducer: The sun gear transmission shaft drives the first sun gear to start rotating, and three planetary gears are arranged around the first sun gear; as the first sun gear meshes and rotates with the three planetary gears, the planetary gears respectively mesh and rotate with the gear grooves of the reducer housing 209, and the planetary gears start to rotate around the first sun gear; as the three planetary gears move, the first planetary disk 239 is driven to rotate and transmitted to the second-stage reducer.

[0095] The second stage reducer, the third stage reducer and the fourth stage reducer have the same structure and power transmission; along with the power transmission, the second planetary disk 240, the third planetary disk 241 and the fourth planetary disk 242 rotate and transmit respectively;

[0096] As the fourth planetary disk 242 rotates, the fifth sun gear fixed thereon starts to rotate. There are four planetary gears around the fifth sun gear. The four planetary gears mesh with the gear grooves on the inner wall of the reducer housing 209 and rotate, allowing the four planetary gears to start rotating around the fifth sun gear. Conductive holes are opened in the middle of the four planetary gears. The planetary gear conduction holes and the reducer output shaft 206 are fixed by fixing pins respectively. As the four planetary gears move, the reducer output shaft 206 is driven to rotate, providing low-speed, high-torque power output (the torque multiple is approximately 1:4000).

[0097] The lower end of the reducer output shaft 206 adopts a spline design, which is connected to the spline connecting sleeve 301 at the upper end of the power output unit and transmitted to the power output unit.

[0098] See also Figure 9-11 The power output unit uses a planetary roller screw for power transmission, and is connected to the working tool through a hollow connecting sleeve to apply axial tension or thrust to it; it can squeeze the bridge plug or packer to produce deformation and seal it; or perform other downhole operations.

[0099] The power output unit mainly includes a spline connection sleeve 301, a planetary roller screw and a hollow connection sleeve 317, and a power output housing 318, the inner wall of which is provided with a guide rail 319;

[0100] To accommodate the axial and radial acceleration forces generated during the perforating explosion process (acceleration can reach 120g), the planetary roller screw includes a screw 312, a drive nut 311, and up to 11 planetary rollers 310; the planetary roller screw has good shock resistance, high durability, and maintains a relatively high transmission efficiency.

[0101] The spline connection sleeve 301 is meshed with the outer spline at the lower end of the reducer output shaft 206 through the inner spline to receive the torque output by the reducer output shaft 206. The spline connection sleeve 301 is located at the upper end of the power output unit; the spline connection sleeve 301 is provided with a fixing ring (the middle protruding part), one side of which is provided with a thrust bearing 304 and a bearing pad ring 306, and the other side is provided with a thrust bearing 304, a spline fixed bearing 303 and a spline fixed ring 302; the two thrust bearings 304 play a role in reducing friction and reducing power loss; at the same time, the spline fixed ring 302 and the spline fixed bearing 303 and the bearing pad ring 306 fix the thrust bearing 304 to prevent displacement.

[0102] The lead screw 312 is inserted into the spline connection sleeve 301, and the lead screw clamp key 305 is inserted between the thrust bearing 304 and the lead screw 312 to fix it, and an upper end stop ring 307 is set on the spline connection sleeve 301 to fix it to prevent it from falling off;

[0103] Grooves are provided at both ends of the driving nut 311, and guide keys 309 are placed in the grooves. The protruding part of the guide keys 309 is placed in the guide rail 319. The guide keys 309 can prevent the driving nut 311 from rotating itself and only move axially along the direction of the guide rail 319.

[0104] The end of the lead screw 312 is inserted into an oil-free bushing 313 and fixed by a lower end stop ring 314 to prevent it from falling off; the oil-free bushing 313 prevents the lead screw from being eccentric and straightens it.

[0105] On the one hand, the transmission nut and the hollow connecting sleeve are connected by threads: the lower end of the transmission nut 311 has a built-in female thread, which is connected to the male thread on the upper end of the hollow connecting sleeve 317; on the other hand, the connection is reinforced by a fixing piece: the two are fixedly connected by screws; in this way, the hollow connecting sleeve 317 can move axially under the drive of the transmission nut.

[0106] A first anti-collision pad 308 and a second anti-collision pad 315 are respectively provided at both ends of the guide rail in the power output housing to prevent parts from being damaged in the vibration of perforating.

[0107] Two sealing ring grooves are provided at the lower end of the hollow connecting sleeve 317, and the sealing ring 316 is placed therein to ensure the seal between the power output housing 318 and the hollow connecting sleeve 317, so as to prevent water from entering the tool and affecting the product performance.

[0108] The lower end of the hollow connection sleeve 317 is preset with an external thread, which is connected to the adapter of the bridge plug or the packer. In particular, the hollow design is more convenient to connect with the adapter; through the axial movement of the hollow connection sleeve 317, a thrust or a pull force is generated to set the bridge plug or the packer.

[0109] The lead screw rotates forward and backward through the motor transmission shaft, driving the lead screw nut to generate an axial forward or backward movement. The lead screw nut is connected to the hollow connecting sleeve, so that the hollow connecting sleeve can also generate an axial forward or backward movement (i.e., generate thrust and pull), so that the present invention can realize the forward or backward movement of the working tool at a low cost.

[0110] The heavy-duty push-pull tool of the present invention realizes low-speed and high-torque power output of the motor output power through the multi-stage reducer and the planetary roller screw transmission design of the downhole operation tool; the tool with an outer diameter of 96mm can output a push-pull force of 30 tons; the tool with an outer diameter of 76mm can output a push-pull force of 19 tons; the tool with an outer diameter of 56mm can output a push-pull force of 13 tons; the power output of downhole electric operations is greatly improved.

[0111] Moreover, the present invention greatly expands the operating range of downhole tools. For example, if casing cutting operations are to be performed, the heavy-load push-pull tool is anchored on the casing before the operation is performed; the hollow connecting sleeve at the front of the tool is connected to the ramp part, which can convert the axial force into radial force to perform casing cutting operations.

[0112] Furthermore, the present invention can also achieve precise control of the push-pull force of the motor and heavy-load tools through a motor control unit. The control module can obtain the relative positions of the transmission nut and the hollow connecting sleeve based on the motor speed and the lead of the screw; when the transmission nut and the hollow connecting sleeve move to the set position, the control module sends an instruction to the motor drive module, and the motor stops working to protect other components in the tool.

[0113] The above embodiments are preferred examples for implementing the present invention, and the present invention is not limited to the above embodiments. Any non-essential additions and substitutions made by those skilled in the art based on the technical features of the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. A heavy-duty electric push-pull tool, characterized in that: It includes a power input unit, a power conversion unit and a power output unit; The power input unit includes a motor connected to an external power source, and the motor output shaft is connected to the power conversion unit through a coupling; The power conversion unit includes a reducer arranged in a reducer housing, and the reducer is provided with a multi-stage planetary reducer; the planetary reducer includes a sun gear, a planetary disk, a planetary carrier and a plurality of planetary gears, the planetary gears are meshed with gear grooves provided on the inner wall of the reducer housing, the sun gear of the first-stage planetary reducer is fixed on the sun gear transmission shaft, and the sun gears of the remaining planetary reducers are fixed on the planetary disks, and a clearance control shaft coaxial with the sun gear transmission shaft is provided between the planetary disks; the power is input from the sun gear transmission shaft to the first-stage planetary reducer, and output from the planetary carrier of the last-stage planetary reducer to the reducer output shaft; There are clearance control shafts between adjacent planetary discs. Both end faces of the clearance control shafts are spherical curved surfaces. The end face of the sun gear transmission shaft is also a spherical curved surface. The contact between the sun gear transmission shaft and the clearance control shaft, and between the clearance control shafts, is point contact. The power output unit includes a power output housing with a guide rail on the inner wall, and a planetary roller screw is arranged inside the housing; the planetary roller screw includes a screw and a transmission nut, and a plurality of planetary rollers are arranged inside the transmission nut. The screw is connected to the output shaft of the reducer through a spline connecting sleeve, and the transmission nut is also connected to a guide flat key embedded in the guide rail; the hollow connecting sleeve is fixedly connected to the transmission nut, and moves axially under the drive of the transmission nut to provide thrust or pulling force for the working tool.

2. The heavy-duty electric push-pull tool according to claim 1, characterized in that: The motor output shaft is connected to the sun gear transmission shaft through a coupling, a bearing group consisting of a deep groove ball bearing and a thrust bearing is arranged between the sun gear transmission shaft and the reducer, and a pressure ring is also arranged between the bearing group and the reducer; A ball bearing group is also arranged between the reducer output shaft and the reducer.

3. The heavy-duty electric push-pull tool according to claim 1, characterized in that: One end of the spline connection sleeve is connected to the output shaft of the reducer through a spline; the other end is inserted into the lead screw, and a stop ring is provided on the spline connection sleeve; Both ends of the transmission nut are provided with grooves adapted to one side of the guide flat key, one side of the guide flat key is placed in the groove, and the other side is placed in the guide rail; The transmission nut is connected to the hollow connecting sleeve through threads and fixed by a fixing piece.

4. The heavy-duty electric push-pull tool according to claim 3, characterized in that: The spline connection sleeve is provided with a fixing ring on the outside, a thrust bearing and a bearing gasket are respectively provided on one side, and a screw clamp key is inserted between the thrust bearing and the screw for fixing; a thrust bearing, a spline fixing bearing and a spline fixing ring are respectively provided on the other side; The end of the lead screw is inserted into an oil-free bushing and fixed with a stop ring; Anti-collision pads are respectively arranged at both ends of the guide rail in the power output housing.

5. The heavy-duty electric push-pull tool according to claim 1, 2, 3 or 4, characterized in that: The power transmission of the power input unit, power conversion unit and power output unit is: The power generated by the motor is transmitted to the sun gear drive shaft through the motor output shaft and coupling, and the power is transmitted to the power conversion unit; The sun gear drive shaft drives the sun gear of the first-stage planetary reducer to rotate, which in turn drives the planetary gear meshing with the reducer housing to rotate. The movement of the planetary gear drives the planetary disk of the next-stage planetary reducer to rotate, and the planetary disk drives the sun gear fixed on it to rotate. Each time the power is transmitted through a planetary reducer, the power torque increases accordingly. When the power is transmitted to the last-stage planetary reducer, the planetary gear rotates through the planet carrier to drive the reducer output shaft to rotate, providing low-speed, high-torque power output. The output shaft of the reducer is connected to the spline connecting sleeve through a spline, and the power is transmitted to the power output unit; The lead screw receives the torque provided by the spline connection sleeve and rotates, driving the transmission nut to move axially. Under the guidance of the guide flat key, the transmission nut only moves axially on the lead screw along the guide rail; The forward direction of the transmission nut is based on the rotation direction of the motor. The positive or reverse rotation of the motor output shaft drives the transmission nut forward or backward through power transmission; The hollow connecting sleeve is provided with a plurality of working tool connection interfaces, and the working tool is fixedly connected to the hollow connecting sleeve; the hollow connecting sleeve fixedly connected to the transmission nut moves axially under the drive of the transmission nut, exerting axial pulling force or thrust on the working tool.

6. The heavy-duty electric push-pull tool according to claim 1, characterized in that: The motor is also connected to a motor control unit, which includes a control module, and a communication module, a collection module, a motor drive module and a power supply module connected thereto; The communication module is used for real-time communication between the motor control unit and the external control panel; The control module receives control signals from the external control panel through the communication module, sends instructions to each module, and feeds back motor operation parameters to the external control panel; The acquisition module collects the operating parameters including the motor speed, direction, voltage and current in real time and sends them to the control module; The motor drive module receives instructions from the control module and adjusts the motor operating parameters; The power supply module converts the power supply voltage into the working voltage required by each module and motor.

7. The heavy-duty electric push-pull tool according to claim 6, characterized in that: The control module can obtain the relative position of the transmission nut and the hollow connecting sleeve based on the rotation speed of the motor and the lead of the screw; when the transmission nut and the hollow connecting sleeve move to the set position, the control module sends a command to the motor drive module and the motor stops working.

8. The heavy-duty electric push-pull tool according to claim 1, characterized in that: The motor is also provided with a brake fixing hole, and the brake mechanism is connected to the motor through the brake fixing hole and the fixing piece; When braking, the brake mechanism locks the motor shaft.

9. The heavy-duty electric push-pull tool according to claim 1, characterized in that: The motor is placed in the motor cushioning sleeve, and both ends of the outer wall of the motor cushioning sleeve are provided with sealing ring grooves, and the sealing ring of the motor cushioning sleeve is placed; The motor and the motor damping sleeve are placed in the power input housing, and the motor is connected to the power input housing through the motor fixing hole and the fixing piece; A sealing ring groove is provided on the power input housing, and a sealing ring of the power input housing is placed therein.

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