A casing guide shoe system driven by a large-diameter all-metal hollow screw drill

Abstract

The present invention discloses a casing shoe system driven by a large-diameter all-metal hollow screw drill, including a system body, wherein the system body includes a screw power unit, a flexible connection unit, a bearing unit and a casing shoe. When high-pressure drilling fluid enters the screw power unit, the screw power unit drives the flexible connection unit to rotate, and the flexible connection unit drives the casing shoe to rotate through the bearing unit. The screw power unit provides the same torque and power when the length is shorter than that of the turbine structure, so it is suitable for various applications requiring high and low torque during casing operations. The casing shoe system driven by the large-diameter all-metal hollow screw drill can also be used for casing drilling operations, realizing casing drilling operations by hydraulic drive without rotating the entire pipe string, thereby improving the efficiency and adaptability of casing drilling operations. At the same time, it saves the time of drilling out internal parts, greatly saving the cost of casing or casing drilling operations.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas technology. The present invention is a tool for driving a casing guide shoe or a drill shoe to perform casing drilling or to help or promote the casing to be smoothly lowered into a predetermined position during the process of running casing or tail pipe in oil or gas well completion. More specifically, the present invention relates to a casing guide shoe system driven by a large-diameter all-metal hollow screw drill. Background Art

[0002] In the process of casing drilling for oil or natural wells, it is crucial to successfully lower the casing to the predetermined depth in one go to achieve the predetermined goal. During the casing lowering process, due to various reasons such as formation stability and wellbore trajectory, various factors that are not conducive to the casing lowering in place may occur, such as wellbore shrinkage, collapse, and high friction resistance. If the casing is not lowered to the predetermined depth, it will increase the difficulty of subsequent operations or fail to exploit the resources of the target layer. If the casing lowering process is not smooth, it will increase the operation time and cost.

[0003] In order to facilitate the smooth lowering of the casing to the target depth, the casing is sometimes rotated by mechanical power at the wellhead to achieve eye-reaming through difficult well sections caused by shrinkage, collapse, etc. However, this method has great limitations. Due to the torque limitation of the casing connection thread or the ground equipment, the casing rotation is often not possible. Therefore, it is necessary to drive the casing guide shoe with hydraulic power to help lower the casing to the predetermined position. At the same time, after the casing is lowered to the predetermined position by hydraulically driving the casing guide shoe, it is often necessary to lower the drill bit and drill tool to use this tool to carry out the next stage of drilling and completion operations.

[0004] In order to facilitate the drill bit to pass through the inner cavity, aluminum alloy and other easy-to-drill materials are usually used to manufacture the internal parts of the hydraulic drive tool. Even if it is an easy-to-drill material, it is very time-consuming to drill through these parts; and the mechanical properties of the easy-to-drill material are poor, which affects the service life of the tool. Downhole hydraulic drive motors can be divided into three categories: screw structure, turbine structure and other structures. In the turbine structure, the torque generated by a single turbine section is very small, a large number of turbine sections are required, the structure is complex, and the length is generally much longer than other tools. The excessive length often does not match the actual needs; the speed of the turbine drill is often more than 1000 revolutions per minute, which is very unfavorable to the performance of the downhole tool, the bearing system and the life of the guide shoe; for the screw structure, an internally injected stator is generally used. Due to the space occupied by the rubber, it is basically impossible to achieve a large enough diameter; and other structures of hydraulic drive motors are rarely used, and the torque generated is often relatively small, which often cannot meet the needs of actual applications. Therefore, it is necessary to propose a casing guide shoe system driven by a large-diameter all-metal hollow screw drill to at least partially solve the problems existing in the prior art. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present invention provides a casing guide shoe system driven by a large-diameter all-metal hollow screw drill, comprising: a system body, the system body comprising a screw power unit, a flexible connection unit, a bearing unit and a casing guide shoe, the flexible connection unit is arranged in the screw power unit, the bearing unit is arranged in the screw power unit and located at the front part of the screw power unit, and the casing guide shoe is arranged at the front end of the screw power unit.

[0007] According to the casing shoe system driven by a large-diameter all-metal hollow screw drill tool of an embodiment of the present invention, the screw power unit includes a screw motor stator and a screw rotor, and the screw rotor is arranged inside the screw motor stator.

[0008] According to the casing shoe system driven by a large-diameter all-metal hollow screw drill tool of an embodiment of the present invention, an inner helicoid is provided on the inner wall of the screw motor stator, and an outer helicoid corresponding to the inner helicoid is provided on the outer wall of the screw rotor.

[0009] According to the casing shoe system driven by a large-diameter all-metal hollow screw drill tool of an embodiment of the present invention, the flexible connection part includes a flexible shaft with a large diameter, the rear end of the flexible shaft is connected to the front end of the screw rotor, and the front end of the screw rotor extends into the rear end of the flexible shaft, and the flexible shaft is set as a slit flexible tube.

[0010] According to the casing guide shoe system driven by a large-diameter all-metal hollow screw drill tool according to the embodiment of the present invention, a rupture disk is arranged in the end surface of the flexible shaft.

[0011] According to the casing shoe system driven by a large-diameter all-metal hollow screw drill tool of an embodiment of the present invention, the bearing part includes an internal core shaft, a bearing outer tube, two first bearings and two second bearings, the rear end of the internal core shaft extends to the front end of the flexible shaft, the bearing outer tube is sleeved on the internal core shaft, and the rear end of the bearing outer tube extends to the front end of the screw motor stator, one of the first bearings is sleeved on the internal core shaft and located at the rear end of the bearing outer tube, a spacer ring is provided on the internal core shaft, and the spacer ring is located in front of the rear end of the bearing outer tube, one of the second bearings is located on the rear side of the spacer ring, and the other first bearing and second bearing are located on the front side of the spacer ring, and a limiting ring is provided at the front end of the internal core shaft.

[0012] According to the casing guide shoe system driven by a large-diameter all-metal hollow screw drill tool of an embodiment of the present invention, the casing guide shoe comprises a guide shoe body, the guide shoe body is arranged at the front end of the internal core shaft, and a plurality of drainage holes are arranged on the guide shoe body.

[0013] According to the casing shoe guide system driven by a large-diameter all-metal hollow screw drill tool of an embodiment of the present invention, the rear end of the screw motor stator is connected to the liquid guide tube through an anti-leakage component and a tensioning component, a first inner connecting tube is arranged in the screw motor stator, a second inner connecting tube is arranged in the liquid guide tube, the first inner connecting tube extends into the liquid guide tube, and a pre-tightening retaining ring is arranged between the first inner connecting tube and the second inner connecting tube, a circumferential groove is arranged at the end of the screw motor stator, the anti-leakage component is arranged in the circumferential groove, and the anti-leakage component includes an inner spring, an inner retaining ring body, an intermediate bone sleeve, and a and an outer anti-leakage piece, the inner spring is located at the inner bottom of the circumferential groove and presses against the inner retaining ring body, the middle bone sleeve is located on the left side of the inner retaining ring body, the outer anti-leakage piece is located on the left side of the middle bone sleeve, a plurality of first positioning hemispheres are arranged on the outer anti-leakage piece, a plurality of first positioning grooves corresponding to the first positioning hemispheres are arranged on the end surface of the liquid guiding tube, a second positioning hemisphere is arranged in the first positioning groove, a second positioning groove corresponding to the second positioning hemisphere is arranged on the first positioning hemisphere, and the tensioning assembly is used to connect the screw motor stator liquid guiding tube.

[0014] According to the casing guide shoe system driven by a large-diameter all-metal hollow screw drill tool according to an embodiment of the present invention, the tensioning assembly includes a locking portion, a plurality of tensioning cylinders, a plurality of guide pillars, and a plurality of tensioning seats. The locking portion is arranged on the liquid guiding cylinder, and the plurality of tensioning seats and the plurality of guide pillars are evenly distributed on the stator of the screw motor. The tensioning seat is provided with a tensioning groove facing away from the liquid guiding cylinder, the guide pillar is located on the left side of the tensioning seat, and a plurality of tensioning hooks are provided at the right end of the tensioning cylinder, and the tensioning hooks extend into the tensioning groove. The inner wall of the tensioning cylinder is provided with a plurality of inner strip grooves, and the upper end of the guide pillar is located in the inner strip groove. The left end of the tensioning cylinder is provided with an outer tensioning cylinder, and the outer tensioning cylinder is movably connected to the locking portion.

[0015] According to the casing guide shoe system driven by a large-diameter all-metal hollow screw drill tool in an embodiment of the present invention, the locking part includes a locking seat ring, a locking nut, a locking sleeve, a pulling sleeve and a plurality of braking mechanisms, the locking seat ring is sleeved on the liquid guide cylinder, the locking nut is threaded on the locking seat ring, the locking nut is provided with a notch groove, the locking sleeve is rotatably arranged on the locking nut and is fixedly connected to the outer pulling elastic cylinder, the braking mechanism includes a brake cylinder, a brake spring and a brake push rod, the brake cylinder is arranged on the left side of the locking seat ring, the brake spring is arranged in the brake cylinder, the left end of the brake push rod is located in the brake cylinder and is connected to the brake spring, the right end of the brake push rod extends into the brake groove of the locking nut, the pulling sleeve is located on the outside of the brake push rod, and is connected to the brake push rod through an inner connecting rod, and the brake cylinder is provided with a brake strip hole corresponding to the inner connecting rod.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The present invention provides a casing shoe system driven by a large-diameter all-metal hollow screw drill. The casing shoe system driven by the large-diameter all-metal hollow screw drill includes: a system body, specifically, the system body includes a screw power unit, a flexible connection unit, a bearing unit and a casing shoe. When high-pressure drilling fluid enters the screw power unit, the screw power unit drives the flexible connection unit to rotate, and the flexible connection unit drives the casing shoe to rotate through the bearing unit. The casing shoe system driven by the large-diameter all-metal hollow screw drill is an all-metal structure without any seals, so it is suitable for high-temperature and normal-temperature operations. Among them, the screw power unit provides the same torque and power when the length is shorter than that of the turbine structure, so it is suitable for various applications that require high and low torques during casing operations. The casing shoe system driven by the large-diameter all-metal hollow screw drill can also be used for casing drilling operations, so that casing operations can be performed by hydraulic drive without rotating the entire pipe string, thereby improving the efficiency and adaptability of casing operations. At the same time, it saves the time of drilling out internal parts and greatly saves the cost of casing drilling operations.

[0018] The other advantages, objectives and features of the casing shoe system driven by the large-diameter all-metal hollow screw drill described in the present invention will be reflected in part through the following description, and will also be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a right side view of the structure of the shoe body in the present invention.

[0022] Figure 3 It is a structural schematic diagram of the screw rotor in the present invention.

[0023] Figure 4 It is a schematic diagram of the structure of the flexible shaft in the present invention.

[0024] Figure 5 It is a partial structural schematic diagram of the liquid guiding tube in the present invention.

[0025] Figure 6 It is a schematic diagram of the internal structure of the liquid-guiding cylinder in the present invention.

[0026] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure of part A.

[0027] Figure 8 It is a structural schematic diagram of the locking part in the present invention.

[0028] Fig. 9 It is a left side view of the structure of the middle and outer anti-leakage sheet of the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0030] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0031] like Figure 1-Figure 4 As shown, the present invention provides a casing guide shoe system driven by a large-diameter all-metal hollow screw drill, comprising: a system body, the system body comprising a screw power unit, a flexible connection unit, a bearing unit and a casing guide shoe, the flexible connection unit is arranged in the screw power unit, the bearing unit is arranged in the screw power unit and located at the front of the screw power unit, and the casing guide shoe is arranged at the front end of the screw power unit.

[0032] The working principle and beneficial effects of the above technical solution: The present invention provides a casing shoe system driven by a large-diameter all-metal hollow screw drill, and the casing shoe system driven by the large-diameter all-metal hollow screw drill includes: a system body, specifically, the system body includes a screw power unit, a flexible connection unit, a bearing unit and a casing shoe, wherein the flexible connection unit is installed in the screw power unit, the bearing unit is installed in the screw power unit and is located in the front of the screw power unit, and the casing shoe is installed at the front end of the screw power unit; the screw power unit rotates under the drive of external power, and when the high-pressure drilling fluid enters the screw power unit, the screw power unit drives the flexible connection unit to rotate, and the flexible connection unit drives the casing shoe to rotate through the bearing unit. The casing shoe system driven by the large-diameter all-metal hollow screw drill is an all-metal structure without any seals, so it is suitable for high-temperature and normal-temperature operations. Among them, the screw power unit provides the same torque and power when the length is shorter than that of the turbine structure, so it is suitable for various applications that require high and low torque during casing operations. The casing shoe system driven by the large-diameter all-metal hollow screw drill can also be used for casing drilling operations, realizing casing drilling operations by hydraulic drive without rotating the entire pipe string, improving the efficiency and adaptability of casing drilling operations. At the same time, it saves the time of drilling out internal parts and greatly saves the cost of casing drilling operations.

[0033] In one embodiment, the screw power unit includes a screw motor stator 1 and a screw rotor 2 , and the screw rotor 2 is disposed inside the screw motor stator 1 .

[0034] The working principle and beneficial effects of the above technical solution: The specific structure of the screw power unit is provided in this embodiment. The screw power unit of the structure includes a screw motor stator 1 and a screw rotor 2. Specifically, the screw rotor 2 is installed inside the screw motor stator 1. When installing the two, the screw motor stator 1 is fixed, and the screw rotor 2 is pushed into the screw motor stator 1 by a thrust cylinder; the thread lock glue is evenly applied to the thread of the end of the screw rotor 2 and the flexible connection part, and the thread is connected and tightened with a pipe clamp; according to the working principle of the screw pump, the number of spiral thread heads of the screw motor stator 1 is generally the number of spiral thread heads of the screw rotor 2 plus 1 to form a sealed chamber. Therefore, when the high-pressure drilling fluid flows through the screw power unit, it squeezes downward from the spiral channel between the screw rotor 2 and the screw motor stator 1, forming a high-pressure and low-pressure chamber between the screw rotor 2 and the screw motor stator 1, and the screw rotor 2 is driven to rotate under the action of the pressure difference, thereby driving the flexible connection part to rotate.

[0035] In one embodiment, an inner spiral body 101 is disposed on the inner wall of the screw motor stator 1 , and an outer spiral body 201 corresponding to the inner spiral body 101 is disposed on the outer wall of the screw rotor 2 .

[0036] The working principle and beneficial effects of the above technical solution: In this embodiment, an inner spiral 101 is arranged on the inner wall of the screw motor stator 1, and an outer spiral 201 is arranged on the outer wall of the screw rotor 2. Therefore, when the screw rotor 2 rotates in the screw motor stator 1, the high-pressure drilling fluid is pushed backward along the inner spiral 101 through the outer spiral 201, and then the high-pressure drilling fluid is squeezed downward from the spiral channel between the screw rotor 2 and the screw motor stator 1, forming a high-pressure and low-pressure chamber between the screw rotor 2 and the screw motor stator 1, and the screw motor stator 1 is driven to rotate under the action of the pressure difference, providing rotational power.

[0037] In one embodiment, the flexible connection portion includes a flexible shaft 3 with a large diameter, the rear end of the flexible shaft 3 is connected to the front end of the screw rotor 2 , and the front end of the screw rotor 2 extends into the rear end of the flexible shaft 3 .

[0038] The working principle and beneficial effects of the above technical solution: In this embodiment, a flexible connection part is provided, which includes a flexible shaft 3 with a large diameter, wherein the rear end of the flexible shaft 3 is connected to the front end of the screw rotor 2, and the front end of the screw rotor 2 extends into the rear end of the flexible shaft 3. When the liquid drives the screw rotor 2 to rotate, the screw rotor 2 drives the flexible shaft 3 to rotate, the flexible shaft 3 drives the bearing part to rotate, and the bearing part drives the casing guide shoe to rotate. The flexible shaft 3 has two functions, one is to convert the eccentric motion of the screw rotor 2 into concentric motion, and the other is to transmit the rotation of the screw rotor 2 to the bearing part.

[0039] In one embodiment, the flexible shaft 3 is configured as a slit flexible tube.

[0040] Working principle and beneficial effects of the above technical solution: In this embodiment, the flexible shaft 3 is set as a slotted flexible tube, where the flexible shaft 3 is a slotted flexible tube, and the flexibility of the flexible shaft 3 is adjusted by adjusting the wall thickness and the distribution of the slots of the flexible shaft 3. In addition, the connection can also adopt a torsion spring connection, or a petal-type universal connection commonly used in downhole screw drilling tools or other universal connections.

[0041] In one embodiment, a rupture disk 4 is disposed in the end surface of the flexible shaft 3 .

[0042] Working principle and beneficial effects of the above technical solution: In this embodiment, a rupture disk 4 is provided on the end surface of the flexible shaft 3, and the rupture disk generally has a dome-shaped, circular or other generally curved rupturable portion and can act in a positive or negative direction. The positive-acting rupture disk is positioned to expose the concave side of the rupturable portion of the pressure-bearing system, thereby placing the disk under tension. Therefore, when an overpressure state is reached, that is, when the system pressure exceeds a safe or ideal level, the rupture disk can release the pressure by bursting outward. Conversely, a reverse-acting rupture disk (also called a reverse buckling rupture disk) is positioned so that its convex side is exposed to the pressure-bearing system, thereby placing the material of the disk in a compressed state. Therefore, when an overpressure state is reached, the rupture disk can be buckled and reversed, that is, inverted and torn to discharge the pressurized fluid.

[0043] In one embodiment, the bearing portion includes an internal core shaft 5, a bearing outer tube 9, two first bearings 7 and two second bearings 10, the rear end of the internal core shaft 5 extends to the front end of the flexible shaft 3, the bearing outer tube 9 is sleeved on the internal core shaft 5, and the rear end of the bearing outer tube 9 extends to the front end of the screw motor stator 1, one of the first bearings 7 is sleeved on the internal core shaft 5 and is located at the rear end of the bearing outer tube 9, a spacer ring 51 is provided on the internal core shaft 5, and the spacer ring 51 is located in front of the rear end of the bearing outer tube 9, one of the second bearings 10 is located on the rear side of the spacer ring 51, and the other first bearing 7 and the second bearing 10 are located on the front side of the spacer ring 51, and a limiting ring 11 is provided at the front end of the internal core shaft 5.

[0044] The working principle and beneficial effects of the above technical solution: The specific structure of the bearing part is provided in this embodiment. The bearing part of the structure includes an internal core shaft 5, a bearing outer tube 9, two first bearings 7 and two second bearings 10. Here, the rear end of the internal core shaft 5 extends to the front end of the flexible shaft 3, the bearing outer tube 9 is installed on the internal core shaft 5, and the rear end of the bearing outer tube 9 extends to the front end of the screw motor stator 1. Therefore, when the high-pressure drilling fluid flows through the screw motor stator 1 and the screw rotor 2, it is squeezed downward from the spiral channel between the screw rotor 2 and the screw motor stator 1, and a high-pressure and low-pressure chamber is formed between the screw rotor 2 and the screw motor stator 1. The screw rotor 2 is driven to rotate under the action of the pressure difference, and then the screw rotor 2 drives the internal core shaft 5 to rotate, and the bearing outer tube 9 is outside the internal core shaft 5;

[0045] In order to make the internal core shaft 5 rotate better, one of the first bearings 7 is sleeved on the internal core shaft 5 and is located at the rear end of the bearing outer tube 9. A spacer ring 51 is provided on the internal core shaft 5, and the spacer ring 51 is located in front of the rear end of the bearing outer tube 9. One of the second bearings 10 is located on the rear side of the spacer ring 51, and the other first bearing 7 and the second bearing 10 are located on the front side of the spacer ring 51. At the same time, the design of the above structure makes the internal core shaft 5 rotate better, and a limiting ring 11 is installed at the front end of the internal core shaft 5. The limiting ring 11 is located at the front end of the second bearing 10 to prevent the second bearing 10 from moving; wherein, the first bearing 7 is a radial straightening bearing, and the second bearing 10 is a thrust bearing.

[0046] In one embodiment, the casing guide shoe comprises a guide shoe body 12 , the guide shoe body 12 is disposed at the front end of the internal core shaft 5 , and a plurality of drainage holes 121 are disposed on the guide shoe body 12 .

[0047] Working principle and beneficial effects of the above technical solution: In this embodiment, the casing guide shoe includes a guide shoe body 12, specifically, the guide shoe body 12 is installed at the front end of the internal core shaft 5, wherein the guide shoe body 12 has a plurality of drainage holes 121, and the outside of the casing guide shoe 12 can be welded or inlaid with one or more of alloys, diamonds, and diamond composite sheets as needed to provide wear resistance or eye expansion capabilities; the casing guide shoe 12 has a shape that plays a guiding role, and the cross-section gradually decreases from top to bottom, and the cross-section can be of any shape; the casing guide shoe 12 is made of aluminum alloy or other easy-to-drill materials, and can also be made of bimetal, and only the easy-to-drill material is used in the part that needs to be drilled through.

[0048] like Figure 5-Figure 9As shown, in one embodiment, the rear end of the screw motor stator 1 is connected to the liquid guide tube 13 through an anti-leakage component 20 and a tensioning component 30, a first inner connecting tube 102 is arranged in the screw motor stator 1, a second inner connecting tube 131 is arranged in the liquid guide tube 13, the first inner connecting tube 102 extends into the liquid guide tube 13, and a pre-tightening retaining ring 14 is arranged between the first inner connecting tube 102 and the second inner connecting tube 131, a circumferential groove 103 is arranged at the end of the screw motor stator 1, the anti-leakage component 20 is arranged in the circumferential groove 103, the anti-leakage component 20 includes an inner spring 201, an inner retaining ring body 202, an intermediate bone sleeve 203 and an outer anti-leakage sheet 204, the inner spring 201 is located at the inner bottom of the circumferential groove 103 and abuts against the inner retaining ring body 202, the middle bone sleeve 203 is located on the left side of the inner retaining ring body 202, the outer anti-leakage sheet 204 is located on the left side of the middle bone sleeve 203, and a plurality of first positioning hemispheres 205 are arranged on the outer anti-leakage sheet 204. A plurality of first positioning grooves 132 corresponding to the first positioning hemispheres 205 are arranged on the end surface of the liquid guiding tube 13, a second positioning hemisphere 133 is arranged in the first positioning groove 132, and a second positioning groove 206 corresponding to the second positioning hemisphere 133 is arranged on the first positioning hemisphere 205. The tensioning assembly 30 is used to connect the screw motor stator 1 to the liquid guiding tube 13.

[0049] The working principle and beneficial effects of the above technical solution: In this embodiment, the screw motor stator 1 is connected to the liquid guide tube 13 by the anti-leakage component 20 and the tensioning component 30, which is convenient for the subsequent separation of the screw motor stator 1 from the liquid guide tube 13 for maintenance. The first inner tube 102 is installed in the screw motor stator 1, and the second inner tube 131 is installed in the liquid guide tube 13. The first inner tube 102 extends into the liquid guide tube 13, and a pre-tightening retaining ring 14 is arranged between the first inner tube 102 and the second inner tube 131. In this way, the high-pressure drilling fluid passes through the first inner tube 102 and the second inner tube 131 without contacting the end surface gap between the screw motor stator 1 and the liquid guide tube 13, which can prevent the high-pressure drilling fluid from leaking in the process of entering the screw motor stator 1 from the liquid guide tube 13;

[0050] At the same time, an anti-leakage component 20 is arranged between the end faces of the screw motor stator 1 and the liquid guide tube 13. The anti-leakage component 20 can further prevent leakage of high-pressure drilling fluid from entering the screw motor stator 1 from the liquid guide tube 13; specifically, the anti-leakage component 20 includes an inner spring 201, an inner retaining ring body 202, an intermediate bone sleeve 203 and an outer anti-leakage sheet 204. A circumferential groove 103 is provided at the end of the screw motor stator 1, and the inner spring 201 is located at the inner bottom of the circumferential groove 103 and abuts against the inner retaining ring body 202, so that the inner retaining ring body 202 pushes the intermediate bone sleeve 203 and the outer anti-leakage sheet 204 toward the liquid guide tube 13, so that the outer anti-leakage sheet 204 is tightly attached to the end face of the liquid guide tube 13, and the outer anti-leakage sheet 204 has There are multiple first positioning hemispheres 205, and the end surface of the liquid guiding tube 13 has multiple first positioning grooves 132 corresponding to the first positioning hemispheres 205, so that the first positioning hemisphere 205 extends into the first positioning groove 132. At the same time, in order to further increase the fixed connection between the two, a second positioning hemisphere 133 is opened in the first positioning groove 132, and a second positioning groove 206 is opened on the first positioning hemisphere 205, so that the second positioning hemisphere 133 extends to the second positioning groove 206. Here, the first positioning hemisphere 205 can be made of wear-resistant and corrosion-resistant silicone material or rubber material; here, a first guide layer 104 and a second guide layer 105 are also arranged on the screw motor stator 1 and the liquid guiding tube 13, so that the high-pressure drilling fluid can flow more smoothly inside the two.

[0051] In one embodiment, the tensioning assembly 30 includes a locking portion 31, multiple tensioning cylinders 32, multiple guide pillars 34, and multiple tensioning seats 35. The locking portion 31 is arranged on the liquid guiding cylinder 13, and the multiple tensioning seats 35 and the multiple guide pillars 34 are evenly distributed on the screw motor stator 1. The tensioning seat 35 is provided with a tensioning groove 351 facing away from the liquid guiding cylinder 13. The guide pillar 34 is located on the left side of the tensioning seat 35. The right end of the tensioning cylinder 32 is provided with multiple tensioning hooks 321, and the tensioning hooks 321 extend into the tensioning groove 351. The inner wall of the tensioning cylinder 32 is provided with multiple inner strip grooves 322. The upper end of the guide pillar 34 is located in the inner strip groove 322. The left end of the tensioning cylinder 32 is provided with an outer tensioning cylinder 323, and the outer tensioning cylinder 323 is movably connected to the locking portion 31.

[0052] The working principle and beneficial effects of the above technical solution: the screw motor stator 1 and the liquid guide tube 13 are connected by a tensioning assembly 30, so that the screw motor stator 1 and the end surface of the liquid guide tube 13 can fit more closely to avoid leakage of high-pressure drilling fluid. Therefore, the specific structure of the tensioning assembly 30 is provided in this embodiment. The tensioning assembly 30 of this structure includes a locking portion 31, a plurality of tensioning tubes 32, a plurality of guide pillars 34, and a plurality of tensioning seats 35. Specifically, the locking portion 31 is installed on the liquid guide tube 13, and the plurality of tensioning seats 35 and the plurality of guide pillars 34 are evenly distributed on the screw motor stator 1, and the tensioning seat 35 is provided with a back-facing portion of the liquid guide tube 1. 3, and the left end of the tensioning cylinder 32 is equipped with an outer tensioning cylinder 323, and the outer tensioning cylinder 323 is movably connected to the locking part 31, so the operator moves the outer tensioning cylinder 323 and the tensioning cylinder 32 to the left by rotating the locking part 31, and at the same time, the multiple tensioning hooks 321 at the right end of the tensioning cylinder 32 are respectively inserted into the tightening groove 351 one by one, and the guide column 34 is located on the left side of the tensioning seat 35, and the upper end of the guide column 34 is located in the inner strip groove 322 of the tensioning cylinder 32, so that the screw motor stator 1 and the end surface of the liquid guide cylinder 13 can be more closely fitted to avoid leakage of high-pressure drilling fluid; at the same time, the above structure has the characteristics of simple and convenient operation.

[0053] In one embodiment, the locking portion 31 includes a locking seat ring 311, a locking nut 312, a locking sleeve 313, a pulling sleeve 314 and a plurality of braking mechanisms. The locking seat ring 311 is sleeved on the liquid guide tube 13, the locking nut 312 is screwed on the locking seat ring 311, and a notch groove is provided on the locking nut 312. The locking sleeve 313 is rotatably provided on the locking nut 312 and is fixedly connected to the outer pulling cylinder 323. The braking mechanism includes a brake cylinder 315, a brake spring 316, a brake push rod 317, and the The brake cylinder 315 is arranged on the left side of the locking seat ring 311, the brake spring 316 is arranged in the brake cylinder 315, the left end of the brake push rod 317 is located in the brake cylinder 315 and connected to the brake spring 316, the right end of the brake push rod 317 extends into the brake groove of the locking nut 312, the pulling sleeve 314 is located on the outside of the brake push rod 317, and is connected to the brake push rod 317 through the inner connecting rod 318, and the brake cylinder 315 is provided with a brake strip hole 319 corresponding to the inner connecting rod 318.

[0054] The working principle and beneficial effects of the above technical scheme: The present embodiment provides a specific structure of the locking portion 31, wherein the locking portion 31 not only plays the role of fixing the tensioning assembly 30, but also has the function of self-locking to prevent circumferential loosening. The locking portion 31 includes a locking seat ring 311, a locking nut 312, a locking sleeve 313, a pulling sleeve 314 and a plurality of braking mechanisms. Specifically, the locking seat ring 311 is sleeved on the liquid guide tube 13, the locking nut 312 is screwed on the locking seat ring 311, the locking nut 312 is provided with a notch groove, the locking sleeve 313 is rotatably mounted on the locking nut 312, and is fixedly connected to the outer pulling cylinder 323, so that the operator rotates the locking nut 312, so that the locking nut 312 moves leftward on the locking seat ring 311, thereby driving the outer pulling cylinder 323 to move leftward as well, so that the tensioning cylinder 32 fixes the screw motor stator 1 and the liquid guide tube 13. The brake mechanism is located on the left side of the locking seat ring 311, and the brake mechanism includes a brake cylinder 315, a brake spring 316, and a brake push rod 317. Here, the brake cylinder 315 is installed on the left side of the locking seat ring 311, and the brake spring 316 is installed in the brake cylinder 315. A brake strip hole 319 is opened on the brake cylinder 315, and the brake push rod 317 is connected with the brake spring 316 in the brake cylinder 315. The pulling sleeve 314 is located on the outside of the brake push rod 317 and is connected with the brake push rod 317 through the inner connecting rod 318. Therefore, the operator can move the inner connecting rod 318 left and right by pulling the sleeve 314, and then the inner connecting rod 318 moves in the brake strip hole 319, so as to drive the brake push rod 317 to move in the brake cylinder 315, and push the brake push rod 317 into the brake groove 3121 of the locking nut 312, thereby preventing the locking nut 312 from circumferential loosening.

[0055] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A casing guide shoe system driven by a large-diameter all-metal hollow screw drill, characterized in that: include: The system body comprises a screw power part, a flexible connection part, a bearing part and a casing guide shoe, wherein the flexible connection part is arranged in the screw power part, the bearing part is arranged in the screw power part and is located at the front part of the screw power part, and the casing guide shoe is arranged at the front end of the screw power part; The screw power unit comprises a screw motor stator (1) and a screw rotor (2), wherein the screw rotor (2) is arranged inside the screw motor stator (1), the flexible connection unit comprises a flexible shaft (3) with a large diameter, the rear end of the flexible shaft (3) is connected to the front end of the screw rotor (2), and the front end of the screw rotor (2) extends into the rear end of the flexible shaft (3), and the flexible shaft (3) is configured as a slit flexible tube, and the bearing unit comprises an internal core shaft (5), a bearing outer tube (9), two first bearings (7) and two second bearings (10), the rear end of the internal core shaft (5) extends into the front end of the flexible shaft (3), and the bearing outer tube (9) is provided with a plurality of first bearings (7) and two second bearings (10). The tube (9) is sleeved on the inner core shaft (5), and the rear end of the bearing outer tube (9) extends to the front end of the screw motor stator (1), one of the first bearings (7) is sleeved on the inner core shaft (5) and is located at the rear end of the bearing outer tube (9), a spacer ring (51) is provided on the inner core shaft (5), and the spacer ring (51) is located in front of the rear end of the bearing outer tube (9), one of the second bearings (10) is located at the rear side of the spacer ring (51), and the other first bearing (7) and the second bearing (10) are located at the front side of the spacer ring (51), and a limit ring (11) is provided at the front end of the inner core shaft (5).

2. The casing guide shoe system driven by a large-diameter all-metal hollow screw drill according to claim 1 is characterized in that: An inner spiral body (101) is arranged on the inner wall of the screw motor stator (1), and an outer spiral body (201) corresponding to the inner spiral body (101) is arranged on the outer wall of the screw rotor (2).

3. The casing guide shoe system driven by a large-diameter all-metal hollow screw drill according to claim 1 is characterized in that: A rupture disk (4) is arranged inside the end surface of the flexible shaft (3).

4. The casing guide shoe system driven by a large-diameter all-metal hollow screw drill according to claim 1 is characterized in that: The casing guide shoe comprises a guide shoe body (12), the guide shoe body (12) is arranged at the front end of the internal core shaft (5), and a plurality of drainage holes (121) are arranged on the guide shoe body (12).

5. The casing guide shoe system driven by a large-diameter all-metal hollow screw drill according to claim 1 is characterized in that: The rear end of the screw motor stator (1) is connected to the liquid guide tube (13) through an anti-leakage component (20) and a tensioning component (30); a first inner connecting tube (102) is arranged in the screw motor stator (1), and a second inner connecting tube (131) is arranged in the liquid guide tube (13); the first inner connecting tube (102) extends into the liquid guide tube (13), and a pre-tightening retaining ring (14) is arranged between the first inner connecting tube (102) and the second inner connecting tube (131); a circumferential groove (103) is arranged at the end of the screw motor stator (1); the anti-leakage component (20) is arranged in the circumferential groove (103); the anti-leakage component (20) comprises an inner spring (201), an inner retaining ring body (202), an intermediate bone sleeve (203) and an outer anti-leakage sheet (204); the inner spring (20 1) is located at the inner bottom of the circumferential groove (103) and abuts against the inner retaining ring body (202), the middle bone sleeve (203) is located on the left side of the inner retaining ring body (202), the outer anti-leakage sheet (204) is located on the left side of the middle bone sleeve (203), a plurality of first positioning hemispheres (205) are arranged on the outer anti-leakage sheet (204), a plurality of first positioning grooves (132) corresponding to the first positioning hemispheres (205) are arranged on the end surface of the liquid guiding tube (13), a second positioning hemisphere (133) is arranged in the first positioning groove (132), a second positioning groove (206) corresponding to the second positioning hemisphere (133) is arranged on the first positioning hemisphere (205), and the tensioning assembly (30) is used to connect the screw motor stator (1) and the liquid guiding tube (13).

6. The casing guide shoe system driven by a large-diameter all-metal hollow screw drill according to claim 5 is characterized in that: The tensioning assembly (30) comprises a locking portion (31), a plurality of tensioning cylinders (32), a plurality of guide pillars (34), and a plurality of tensioning seats (35); the locking portion (31) is arranged on the liquid guiding cylinder (13); the plurality of tensioning seats (35) and the plurality of guide pillars (34) are evenly distributed on the screw motor stator (1); the tensioning seat (35) is provided with a tensioning groove (351) facing away from the liquid guiding cylinder (13); the guide pillars (34) are located on the tensioning seat (31). 5), a plurality of tightening hooks (321) are arranged at the right end of the tightening cylinder (32), and the tightening hooks (321) extend into the tightening groove (351), and a plurality of inner strip grooves (322) are arranged on the inner wall of the tightening cylinder (32), and the upper end of the guide column (34) is located in the inner strip groove (322), and an outer pulling cylinder (323) is arranged at the left end of the tightening cylinder (32), and the outer pulling cylinder (323) is movably connected to the locking portion (31).

7. The casing guide shoe system driven by a large-diameter all-metal hollow screw drill according to claim 6 is characterized in that: The locking portion (31) comprises a locking seat ring (311), a locking nut (312), a locking sleeve (313), a pulling sleeve (314) and a plurality of braking mechanisms. The locking seat ring (311) is sleeved on the liquid guide tube (13). The locking nut (312) is screwed on the locking seat ring (311). The locking nut (312) is provided with a notch groove. The locking sleeve (313) is rotatably arranged on the locking nut (312) and is fixedly connected to the outer pulling spring tube (323). The braking mechanism comprises a brake cylinder (315), a brake spring (316) and a brake push rod (317). The brake cylinder ( The brake cylinder (315) is arranged on the left side of the locking seat ring (311), the brake spring (316) is arranged in the brake cylinder (315), the left end of the brake push rod (317) is located in the brake cylinder (315) and is connected to the brake spring (316), the right end of the brake push rod (317) extends into the brake groove of the locking nut (312), the pulling sleeve (314) is located on the outside of the brake push rod (317) and is connected to the brake push rod (317) through an inner connecting rod (318), and the brake cylinder (315) is provided with a brake strip hole (319) corresponding to the inner connecting rod (318).

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