Mechanical hydraulic combined sand cleaning drill pipe

Abstract

The present application provides a kind of mechanical hydraulic combined sand cleaning drill pipe, including drill pipe body, spiral protrusion being arranged on the drill pipe body, the spiral protrusion is arranged on the side of the drill pipe body, so that the centroid of the drill pipe body deviates from the central axis;And water jet mechanism being arranged on the drill pipe body, the water jet mechanism is intermittently along the side of the drill pipe body and is radially ejected drilling fluid.This application utilizes the autorotation of drill pipe in the process of drilling, generates vortex effect around the axis of wellbore, mechanically disturbs the cuttings bed while driving the flow of drilling fluid to form around the axis spiral fluid;At the same time, use the nozzle on the rod, high-speed spray the drilling fluid in the drill pipe, accelerate the cuttings to strip the cuttings bed and enter the annulus fluid, under the flow of drilling fluid, improve the migration ability of cuttings, improve the degree of wellbore cleaning.

Description

Technical Field

[0001] This invention relates to a mechanical-hydraulic combined sand-cleaning drill pipe, particularly a mechanical-hydraulic combined sand-cleaning drill pipe composed of both mechanical and hydraulic sand-cleaning methods, belonging to the field of drilling engineering technology. Background Technology

[0002] With the deepening development of unconventional oil and gas, the application of extended reach well technology is becoming increasingly widespread. To achieve efficient development of unconventional oil and gas, the depth and horizontal section length of extended reach wells are constantly increasing. During the drilling process of extended reach wells, cuttings beds are easily formed due to factors such as well inclination angle, cuttings particle size, and annular hydraulic parameters. The presence of cuttings beds can easily attract the drill string, leading to excessive frictional torque during drilling, causing difficulties in drilling pressure transmission, and even accidents such as sand jamming of the drill string, seriously affecting drilling efficiency and safety.

[0003] Increasing hydraulic displacement and enhancing hydraulic cuttings carrying capacity are effective methods to reduce cuttings beds and improve wellbore cleanliness. However, as well depth increases, hydraulic parameters cannot be excessively enhanced due to limitations in the performance of surface pumps and turbines. Therefore, cuttings bed removal tools have gradually been developed in drilling practice to work in conjunction with hydraulic cuttings carrying capacity. Common cuttings bed removal tools mainly utilize their own spiral grooves to agitate the drilling fluid and discharge the cuttings from the spiral groove channels. However, existing cuttings bed removal tools typically only rotate around their own axis when rotating with the drill string. The vortex formed during rotation is relatively small, and cuttings often adhere to them and are difficult to remove. Therefore, cuttings removal tools often suffer from low cuttings removal efficiency in actual operation due to insufficient agitation of cuttings. Summary of the Invention

[0004] To address the aforementioned technical problems in existing technologies, this invention proposes a combined mechanical and hydraulic sand-cleaning drill pipe. Utilizing the drill pipe's rotation during drilling, a vortex effect is generated around the wellbore axis, mechanically disturbing the cuttings bed while simultaneously driving the flowing drilling fluid to form a spiral fluid around the axis. Simultaneously, nozzles on the pipe body eject the drilling fluid at high speed, accelerating the stripping of cuttings from the cuttings bed and their entry into the annular fluid. Under the entrainment of the drilling fluid flow, the cuttings' transport capacity is improved, thus enhancing the wellbore cleanliness.

[0005] A mechanical-hydraulic combined sand-removing drill rod according to the present invention comprises:

[0006] Drill pipe body,

[0007] A helical protrusion is provided on the drill pipe body, the helical protrusion being located on one side of the drill pipe body, causing the center of mass of the drill pipe body to deviate from its central axis; and

[0008] A water spraying mechanism is installed on the drill pipe body, which intermittently sprays drilling fluid radially along the side of the drill pipe body.

[0009] A further improvement of the present invention is that one side of the outer wall of the spiral protrusion is a concave surface, and the other side is a convex arc surface.

[0010] A further improvement of the present invention is that the spiral protrusion is located in the middle part on one side of the drill rod body, and a 1-2m long cylinder is reserved at each end of the drill rod body.

[0011] A further improvement of the present invention is that the water spraying mechanism includes a rotor disposed inside the drill pipe body and a nozzle disposed on the side wall of the drill pipe body; the rotor rotates under the drive of drilling fluid, and a flow channel mechanism that cooperates with the nozzle is disposed on the rotor, the flow channel mechanism being intermittently connected to the nozzle as the rotor rotates.

[0012] A further improvement of the present invention is that: the rotor includes a central shaft, a profiled cylinder is provided on the outer side of the central shaft, and the profiled cylinder is connected to the central shaft by a plurality of helical blades;

[0013] The drill pipe body has a stepped surface inside, and a rotor mounting cavity is formed on the stepped surface. The profile cylinder is placed inside the rotor mounting cavity.

[0014] A further improvement of the present invention is that: the flow channel mechanism includes a profile cylinder flow channel disposed on the side of the profile cylinder, a drill pipe body wall flow channel is disposed on the side of the drill pipe body, and the nozzle is disposed outside the drill pipe body wall flow channel.

[0015] A further improvement of the present invention is that the nozzle is disposed on the spiral protrusion and on one side close to the concave surface.

[0016] A further improvement of the present invention is that a sliding bearing is provided between the outer wall of the profile cylinder and the inner wall of the drill rod body.

[0017] A further improvement of the present invention is that a thrust bearing is provided between the end of the profile cylinder and the stepped surface of the drill rod body.

[0018] A further improvement of the present invention is that a sealing assembly is provided between the outer wall of the profile cylinder and the inner wall of the drill rod body.

[0019] A further improvement of the present invention is that: a single mechanical-hydraulic combined sand-cleaning drill rod is installed alternately with one or more ordinary drill rods; or multiple mechanical-hydraulic combined sand-cleaning drill rods are connected in series to form a group and installed alternately with ordinary drill rods.

[0020] A further improvement of the present invention is that when multiple mechanical-hydraulic combined sand-cleaning drill rods are connected in series to form a group and installed at intervals with ordinary drill rods, the spiral protrusions are on the same side.

[0021] Compared with the prior art, the advantages of the present invention are as follows:

[0022] The present invention discloses a mechanical-hydraulic combined sand-removing drill pipe, wherein the drill pipe body has a helical protrusion on one side. When the drill string rotates, the helical protrusion tangentially pushes the cuttings bed at the bottom edge of the wellbore. On the other hand, the helical protrusion causes the drill pipe body to be eccentric in mass. When the drill string rotates, it generates a centrifugal force. This centrifugal force causes the drill pipe to detach from the bottom edge of the wellbore and vortex around the wellbore axis in the wellbore annulus. This causes the cuttings bed at the bottom edge of the wellbore to be mechanically disturbed by the drill string, resulting in mechanical damage to the cuttings bed. At the same time, the water jetting mechanism intermittently sprays drilling fluid to accelerate the stripping of cuttings from the cuttings bed and into the annular fluid, thereby achieving a combined mechanical and hydraulic sand-removing effect.

[0023] The mechanical-hydraulic combined sand-cleaning drill pipe of this invention utilizes a helical protrusion on the drill pipe body. This helical protrusion, through mass eccentricity, drives the drill pipe to vortex significantly within the wellbore. This, combined with the helical protrusion, mechanically disturbs and disrupts the cuttings bed. It also effectively drives the flowing drilling fluid to form a spiral flow around the axis, agitating and carrying away the cuttings, achieving efficient sand removal. Simultaneously, the high-speed drilling fluid intermittently flushes the cuttings bed, achieving a combined mechanical and hydraulic sand-cleaning effect, enhancing the wellbore cleaning efficiency. The drill pipe has a simple structure, is easy to manufacture, convenient for field application, and offers high safety and reliability. Attached Figure Description

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which:

[0025] Figure 1 This is a schematic diagram of a mechanical-hydraulic combined sand-removing drill rod according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 AA section view;

[0027] Figure 3 for Figure 1 BB cross-sectional view.

[0028] The meanings of the reference numerals in the attached figures are as follows:

[0029] 1. Drill pipe body; 2. Helical protrusion; 3. Water spray mechanism; 11. Upper connector; 12. Lower connector; 13. Drill pipe body pipe wall flow channel; 14. Nozzle; 21. Concave surface; 22. Arc surface; 31. Central shaft; 32. Profile cylinder; 33. Helical blade; 34. Stepped surface; 35. Profile cylinder flow channel; 36. Sliding bearing; 37. Thrust bearing; 38. Sealing assembly. Detailed Implementation

[0030] To make the technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0031] In horizontal well sections where cuttings beds are easily formed, the drill string is subjected to gravity and adheres to the lower well wall. When the ground rotary table drives the drill string to rotate, the conventional drill pipe, due to its overall symmetry and lack of mass eccentricity, will still rotate along the well wall when the drill string rotates. Furthermore, the drill pipe body 1 does not have a spiral protrusion 2 or has a spiral flow channel that is insufficient to disrupt the cuttings bed. This embodiment proposes a mechanical-hydraulic combined sand-cleaning drill pipe. The drill pipe body 1 has a helical protrusion 2 on one side. When the drill string rotates, the helical protrusion 2 tangentially pushes the cuttings bed at the bottom edge of the wellbore. Simultaneously, the helical protrusion 2 causes the drill pipe body 1 to become eccentric, generating a centrifugal force as the drill string rotates. This centrifugal force causes the drill pipe to detach from the bottom edge of the wellbore and vortex around the wellbore axis in the annulus, mechanically disturbing the cuttings bed at the bottom edge of the wellbore and causing mechanical damage to the cuttings bed. Simultaneously, the water jetting mechanism 3 intermittently sprays drilling fluid, accelerating the stripping of cuttings from the cuttings bed and their entry into the annular fluid, thus achieving a combined mechanical and hydraulic sand-cleaning effect.

[0032] Figure 1 The illustration schematically depicts a mechanical-hydraulic combined sand-cleaning drill pipe according to this embodiment, comprising a drill pipe body 1, an upper connector 11 at the upper end of the drill pipe body 1, and a lower connector 12 at the lower end. The upper connector 11 is a female thread, used to connect with the male connectors of other sections of the mechanical-hydraulic combined sand-cleaning drill pipe or with the male connectors of ordinary drill pipes; the lower connector 12 is a male thread, used to connect with the female threads of other mechanical-hydraulic combined sand-cleaning drill pipes or with the female threads of ordinary drill pipes.

[0033] A spiral protrusion 2 is also provided on the drill pipe body 1. The spiral protrusion 2 is arranged on one side of the drill pipe body 1. Since the spiral protrusion 2 has a certain weight, the center of mass of the drill pipe body 1 is close to the side of the spiral protrusion 2, thereby deviating from the central axis 31 of the drill pipe body 1 (the central axis 31 here is the central axis 31 of the central hole of the drill pipe body 1).

[0034] In this embodiment, by setting a spiral protrusion 2, the cuttings bed at the bottom edge of the wellbore is tangentially pushed on one side when the drill string rotates. On the other hand, the protrusion causes the drill pipe body 1 to be eccentric in mass. When the drill string rotates, a centrifugal force is generated. This centrifugal force causes the drill pipe to detach from the bottom edge of the wellbore and vortex around the wellbore axis in the wellbore annulus. This causes the cuttings bed at the bottom edge of the wellbore to be mechanically disturbed by the drill string, resulting in mechanical damage to the cuttings bed.

[0035] A water spraying mechanism 3 is also provided on the drill pipe body 1. The water spraying mechanism 3 intermittently sprays drilling fluid radially along the side of the drill pipe body 1. The intermittent spraying of drilling fluid accelerates the stripping of rock cuttings from the rock cuttings bed and into the annular fluid, thereby achieving a combined mechanical and hydraulic sand removal effect.

[0036] In the mechanical-hydraulic combined sand-removing drill pipe according to this embodiment, the drill pipe body 1 with spiral protrusion 2 can be driven by mass eccentricity to vortex the drill pipe in the wellbore, and the spiral protrusion 2 can work together to mechanically disturb and destroy the cuttings bed, and can fully drive the flowing drilling fluid to form a spiral flow around the axis, agitating and carrying the cuttings, so as to achieve the purpose of efficient sand removal.

[0037] Because the shape of the spiral protrusion 2 has limitations in its effect on the flow and agitation of drilling fluid, which affects the carrying of cuttings, this embodiment also utilizes high-speed drilling fluid to intermittently flush the cuttings bed to avoid cuttings accumulation and blockage. The flushing method combined with the rotation of the spiral protrusion achieves a combined mechanical and hydraulic sand-removing effect, enhancing the wellbore cleaning effect. The drill pipe has a simple structure, is easy to manufacture, convenient for field application, and has high safety and reliability.

[0038] In one embodiment, such as Figure 2 As shown, the outer wall of the spiral protrusion 2 is composed of two arc surfaces, one side of the spiral protrusion 2 is a concave surface 21, and the other side is a convex arc surface 22.

[0039] The spiral protrusion 2 is generally a convex structure, but mainly consists of two relatively smooth arc surfaces. The two arc surfaces are arranged on both sides of the spiral protrusion 2, and the connecting part forms an edge. One side of the spiral protrusion 2 is a concave surface 21, and the other side is a convex arc surface 22. A concave arc surface is formed on one side of the concave surface 21, which can drive the fluid when the drill pipe rotates, thereby causing the drilling fluid to be driven to rotate and flow around the drill pipe.

[0040] During the use of the mechanical-hydraulic combined sand-cleaning drill pipe according to this embodiment, as the drill string rotates, the spiral protrusion 2 on the drill pipe body 1 generates a turbulent effect. At this time, the concave surface 21 of the spiral protrusion 2 drives the axially flowing drilling fluid to generate a spiral flow around the outer surface of the drill pipe. The spiral flow of the drilling fluid enhances the flushing and carrying effect on rock cuttings.

[0041] In one embodiment, the spiral protrusion 2 is located in the middle part on one side of the drill rod body 1, and the length of the spiral protrusion 2 in the axial direction of the drill rod body 1 is longer than that at the end of the drill rod body 1. A 1-2m long cylinder is reserved at each end of the drill rod body 1, and this section of cylinder is not covered by the spiral protrusion 2.

[0042] In this embodiment, by reserving a long cylindrical section at both ends of the drill pipe body 1, the construction requirement that the pipe body can be clamped by the seat during drill pipe connection and disconnection is met.

[0043] In one embodiment, the water spraying mechanism 3 includes a rotor disposed inside the drill pipe body 1 and a nozzle 14 disposed on the side wall of the drill pipe body 1. A flow channel mechanism is provided on the side of the rotor, and the flow channel mechanism cooperates with the nozzle 14.

[0044] During the use of the mechanical-hydraulic combined sand-cleaning drill pipe according to this embodiment, the rotor rotates under the drive of drilling fluid. The flow channel mechanism intermittently communicates with the nozzle 14 as the rotor rotates. When the flow channel mechanism is in communication with the nozzle 14, the drilling fluid is ejected through the nozzle 14. In this way, the rotation of the rotor enables the nozzle 14 to eject fluid intermittently.

[0045] In the mechanical-hydraulic combined sand-cleaning drill pipe according to this embodiment, the rotor is rotatably disposed within the drill pipe body 1 and can rotate under the drive of drilling fluid. When the drilling fluid flows within the drill pipe body 1, it drives the rotor to rotate. During the rotation of the rotor, when the flow channel mechanism rotates to be opposite the nozzle 14, the flow channel mechanism connects the interior of the rotor with the nozzle 14, and the drilling fluid inside the rotor is ejected through the flow channel mechanism and the nozzle 14.

[0046] In one embodiment, the rotor includes a central shaft 31, and a profiled cylinder 32 is disposed on the outer side of the central shaft 31. The profiled cylinder 32 is connected to the central shaft 31 by a plurality of helical blades 33. In this embodiment, a stepped surface 34 is provided inside the drill pipe body 1, and a rotor mounting cavity is formed on the stepped surface 34. The profiled cylinder 32 is disposed inside the rotor mounting cavity.

[0047] In the mechanical-hydraulic combined sand-cleaning drill pipe according to this embodiment, the central shaft 31 serves to support the inner side of the spiral blade 33. The spiral blade 33 is arranged in a spiral shape inside the profile cylinder 32. When drilling fluid flows through the rotor, the spiral blade 33 pushes the profile cylinder 32 to rotate under the action of the drilling fluid.

[0048] In the mechanical-hydraulic combined sand-cleaning drill pipe according to this embodiment, the central shaft 31 has a columnar structure, and the profiled cylinder 32 has a cylindrical structure, forming an annular space between them. Helical blades 33 are evenly arranged within the annular space between the central shaft 31 and the profiled cylinder 32, and the number of helical blades 33 can be four, or reduced or increased depending on the actual situation. The helical blades 33 are propelled by the drilling fluid, causing the profiled cylinder 32 to rotate, thereby causing the entire rotor to rotate within the drill pipe body 1.

[0049] In one embodiment, the flow channel mechanism includes a profiled cylinder flow channel 35 disposed on the side of the profiled cylinder 32, the profiled cylinder flow channel 35 being radially formed on the outer wall of the profiled cylinder 32. A drill pipe body wall flow channel 13 is disposed on the side of the drill pipe body 1, the drill pipe body wall flow channel 13 being radially formed on the outer wall of the drill pipe body 1, and the nozzle 14 is disposed outside the drill pipe body wall flow channel 13.

[0050] During the rotation of the rotor, the profile cylinder 32 rotates within the rotor mounting cavity, and the profile cylinder flow channel 35 on its side periodically connects to the drill pipe body wall flow channel 13, thereby connecting the inside of the rotor and the nozzle 14. The drilling fluid inside the rotor is ejected through the nozzle 14.

[0051] In one embodiment, the nozzle 14 is disposed on the spiral protrusion 2 and close to one side of the concave surface 21. In this embodiment, the drill pipe body wall flow channel 13 is disposed along the radial direction of the drill pipe body 1, and the nozzle 14 is inclined at its end, with the inclined direction facing one side of the concave surface 21. The drilling fluid sprayed through the nozzle 14 can clean the carried gravel.

[0052] In a preferred embodiment, such as Figure 3 As shown, a sliding bearing 36 is provided between the outer wall of the profile cylinder 32 and the inner wall of the drill rod body 1. The sliding bearing 36 has an annular structure, which can reduce the frictional resistance of the rotor during rotation and improve the rotation efficiency.

[0053] A thrust bearing 37 is provided between the end of the profile cylinder 32 and the stepped surface 34 of the drill pipe body 1. The main thrust bearing is an annular cylindrical bearing, which can provide support when the profile cylinder 32 rotates, and also reduce the frictional resistance during rotation.

[0054] In one embodiment, a sealing assembly 38 is provided between the outer wall of the profile cylinder 32 and the inner wall of the drill pipe body 1.

[0055] In the drill pipe described in this embodiment, the drill pipe body 1 has a stepped interior, with a rotor sitting on the stepped surface 34. The rotor mainly consists of three parts: a spindle, helical blades 33, and a profile cylinder 32. The spindle 31 and the profile cylinder 32 are connected by the helical blades 33, which are helical in shape. When the drilling fluid flows through, the profile cylinder 32 can be rotated under the push of the drilling fluid.

[0056] A thrust bearing 37 is located between the rotor profile cylinder 32 and the axial stepped surface 34, and a sliding bearing 36 is located between the rotor profile cylinder 32 and the inner wall of the drill pipe body 1. These components are sealed by a sealing assembly 38. The profile cylinder 32 has a cylindrical flow channel that communicates with the drilling fluid flow channel on the wall of the drill pipe body 1. The thrust bearing 37 and the sliding bearing 36 reduce frictional resistance, while the sealing assembly 38 achieves a sliding seal.

[0057] In this embodiment, the drill pipe body 1 has a protrusion on one side. When the drill string rotates, it tangentially pushes the cuttings bed at the bottom edge of the wellbore. Due to the centrifugal force generated by the eccentric helical protrusion 2, the drill pipe is driven away from the bottom edge of the wellbore and vortexes around the wellbore axis in the wellbore annulus. This causes the cuttings bed at the bottom edge of the wellbore to be mechanically disturbed by the drill string, resulting in mechanical damage to the cuttings bed. At the same time, as the drill string rotates, the helical protrusion 2 on the body generates a turbulence effect. The concave surface 21 of the helical protrusion 2 drives the axially flowing drilling fluid to generate a helical flow around the outer surface of the drill pipe. The helical flow of the drilling fluid enhances the flushing and carrying effect on the cuttings.

[0058] Meanwhile, as drilling fluid flows through the inside of the drill pipe, the high-speed drilling fluid drives the rotor helical blades 33 to rotate, which in turn drives the rotor profile cylinder 32 to rotate. Its cylindrical flow channel is connected and closed with the drilling fluid flow channel on the drill pipe body 1. The drilling fluid is intermittently ejected at high speed through the nozzle 14 on the helical protrusion 2, which accelerates the stripping of rock cuttings from the rock cuttings bed and into the annular fluid, thereby playing a combined mechanical and hydraulic sand removal role.

[0059] In one embodiment, a single mechanical-hydraulic combined sand-cleaning drill pipe is installed alternately with one or more ordinary drill pipes; or multiple mechanical-hydraulic combined sand-cleaning drill pipes are connected in series to form a group and installed alternately with ordinary drill pipes.

[0060] When multiple mechanical-hydraulic combined sand-cleaning drill rods are connected in series to form a group and installed at intervals with ordinary drill rods, the spiral protrusions are on the same side.

[0061] When using mechanical-hydraulic sand-cleaning drill pipes for wellbore cleaning in horizontal well sections, a single mechanical-hydraulic sand-cleaning drill pipe can be used alone, or multiple mechanical-hydraulic sand-cleaning drill pipes can be used in combination. When used alone, one mechanical-hydraulic sand-cleaning drill pipe can be used every 3 to 5 ordinary drill pipes (100 to 150 meters); when multiple mechanical-hydraulic sand-cleaning drill pipes are used in combination, three can be used as one column.

[0062] When used as a single drill rod, it should be threaded and used normally as a conventional drill rod. When three drill rods are used together, to improve the quality and eccentricity of the drill rod, it should be ensured that the spiral protrusion 2 of the main body is on the same side of the longitudinal section of the drill string after tight connection. Of course, the number of mechanical and hydraulic combined sand-cleaning drill rods can be increased or decreased according to the actual situation.

[0063] In the mechanical-hydraulic combined sand-cleaning drill pipe described in this invention, the helical protrusions on the drill pipe body allow for significant vortexing within the wellbore via mass eccentricity. This helical protrusions, in conjunction with other features, mechanically disturb and disrupt the cuttings bed, while simultaneously driving the flowing drilling fluid to form a spiral flow around the axis, agitating and carrying the cuttings to achieve efficient sand removal. Simultaneously, the high-speed drilling fluid intermittently flushes the cuttings bed, achieving a combined mechanical and hydraulic sand-cleaning effect and enhancing wellbore cleaning. The drill pipe has a simple structure, is easy to manufacture, convenient for field application, and offers high safety and reliability.

[0064] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and / or modifications falling within the scope of the invention, and all changes and / or modifications made according to embodiments of the invention should be covered within the protection scope of the invention.

Claims

1. A mechanical-hydraulic combined sand-removing drill rod, characterized in that, include: Drill pipe body (1). A helical protrusion (2) is provided on the drill pipe body (1), the helical protrusion (2) being located on one side of the drill pipe body (1), causing the center of mass of the drill pipe body (1) to deviate from its central axis (31); and A water spraying mechanism (3) is provided on the drill pipe body (1), and the water spraying mechanism (3) intermittently sprays drilling fluid radially along the side of the drill pipe body (1); The water spraying mechanism (3) includes a rotor disposed inside the drill pipe body (1) and a nozzle (14) disposed on the side wall of the drill pipe body (1); the rotor rotates under the drive of drilling fluid, and a flow channel mechanism that cooperates with the nozzle (14) is disposed on the rotor; the flow channel mechanism is intermittently connected to the nozzle (14) as the rotor rotates. The rotor includes a central shaft (31), and a profile cylinder (32) is provided on the outside of the central shaft (31). The profile cylinder (32) is connected to the central shaft (31) by a number of helical blades (33). The drill pipe body (1) has a stepped surface (34) inside, and a rotor mounting cavity is formed on the stepped surface (34). The profile cylinder (32) is disposed in the rotor mounting cavity. The flow channel mechanism includes a profile cylinder flow channel (35) disposed on the side of the profile cylinder (32), a drill pipe body wall flow channel (13) disposed on the side of the drill pipe body (1), and a nozzle (14) disposed on the outside of the drill pipe body wall flow channel (13).

2. The mechanical-hydraulic combined sand-cleaning drill rod according to claim 1, characterized in that, One side of the outer wall of the spiral protrusion (2) is a concave surface (21) and the other side is a convex arc surface (22).

3. The mechanical-hydraulic combined sand-cleaning drill rod according to claim 2, characterized in that, The spiral protrusion (2) is located in the middle part on one side of the drill rod body (1), and a 1-2m long cylinder is reserved at each end of the drill rod body (1).

4. The mechanical-hydraulic combined sand-cleaning drill rod according to claim 3, characterized in that, The nozzle (14) is located on the spiral protrusion (2) and on one side near the concave surface (21).

5. The mechanical-hydraulic combined sand-cleaning drill rod according to claim 4, characterized in that, A sliding bearing (36) is provided between the outer wall of the profile cylinder (32) and the inner wall of the drill rod body (1).

6. The mechanical-hydraulic combined sand-cleaning drill rod according to claim 5, characterized in that, A thrust bearing (37) is provided between the end of the profile cylinder (32) and the stepped surface (34) of the drill rod body (1).

7. The mechanical-hydraulic combined sand-cleaning drill rod according to claim 6, characterized in that, A sealing assembly (38) is provided between the outer wall of the profile cylinder (32) and the inner wall of the drill rod body (1).

8. The mechanical-hydraulic combined sand-cleaning drill rod according to any one of claims 1 to 7, characterized in that, A single mechanical-hydraulic combined sand-cleaning drill rod is installed alternately with one or more ordinary drill rods; or multiple mechanical-hydraulic combined sand-cleaning drill rods are connected in series to form a group and installed alternately with ordinary drill rods.

Images