Rock debris bed sand cleaning device

Abstract

The invention discloses a cuttings bed sand cleaning device which is characterized in that an upper joint water distribution cavity is formed in the upper part of an upper joint, an upper joint cylindrical section is arranged below the upper joint water distribution cavity, a reducing upper joint central shaft is arranged below the upper joint cylindrical section, and a lower end thread section of the upper joint central shaft is screwed in an inner screw hole of a lower joint; the sand cleaning power mechanism comprises multiple stages of turbine assemblies and a sand cleaning rotary drum, each stage of turbine assembly comprises a turbine stator and a turbine rotor which are matched with each other, the turbine stators are sequentially stacked and arranged on the periphery of the upper connector center shaft in a sleeving mode, and the turbine rotors are sequentially stacked and fixed to the inner wall of the sand cleaning rotary drum. A plurality of sand cleaning ribs are uniformly arranged on the outer wall of the sand cleaning drum; a plurality of upper connector overflowing holes are evenly distributed in the circumference of the bottom wall of the upper connector water distribution cavity and communicated with the space where the turbine assembly is located, and a plurality of lower connector overflowing holes are evenly distributed in the circumference of the upper end face of the lower connector and communicated with the lower connector confluence cavity. When the drilling tool does not rotate, the sand remover can efficiently remove the cuttings bed.

Description

Technical Field

[0001] The invention relates to a downhole work simulation device, in particular to a cuttings bed sand cleaner, and belongs to the technical field of oil drilling. Background Art

[0002] A directional well with a ratio of inclination length to vertical depth greater than 2 and an inclination angle between 60 and 86 degrees is called a high-angle well. When the inclination angle exceeds 35°, the cuttings sink to the lower well wall under their own weight, forming a friction cushion. In the high-angle well section, a considerable part of the drill bit lies at the bottom of the well. The friction caused by the contact between the cushion and the drill bit leads to problems such as abnormal increase in torque, directional support pressure and increased annular pressure loss, which increases the load on ground equipment and downhole risks.

[0003] In response to the problem of wellbore cleaning, a large number of studies on wellbore cleaning tools (commonly called sand cleaners) have been carried out both at home and abroad, and certain results have been achieved. The Chinese invention patent with publication number CN 106639930A discloses a vortex generator, including an upper joint, a lower joint and a turbine. The upper joint includes a drill pipe box buckle, an upper cylinder and an upper boss. The outer surface of the upper cylinder is evenly provided with upper spiral strips. The end face of the upper boss is axially provided with a plurality of upper flow holes. The upper ends of the upper flow holes extend upward and pass through the upper cylinder and are connected with the inner hole of the drill pipe box buckle. The lower joint includes a lower boss, a core shaft, a lower cylinder and a drill pipe male buckle. The outer surface of the lower cylinder is evenly provided with a plurality of lower spiral strips, and the rotation direction of the lower spiral strips is opposite to that of the upper spiral strips. The end face of the lower boss is axially provided with a plurality of lower flow holes, which are connected with the inner hole of the drill pipe male buckle. The upper and lower joints are connected through a central axis, the turbine is sleeved on the central axis, the two ports of the turbine are respectively sleeved on the upper and lower bosses, and the outer surface of the turbine is evenly provided with a plurality of straightening strips. The end face of the turbine is axially provided with a plurality of through holes, and the upper and lower ends of the through holes are respectively connected with the upper and lower flow holes. The fluid flows through the turbine through-hole through the upper through-hole, impacts the turbine, rotates the straightening bar, thereby scraping the rock cuttings, and then flows out from the lower through-hole.

[0004] The vortex generator is only equipped with a first-stage turbine, and only a bundle of spiral grooves is set between the turbine casing and the turbine inner tube. The driving force is limited, and the straightening strips on the outer surface of the turbine have weak sand cleaning power. The upper and lower end faces of the turbine are matched with the upper and lower cylindrical end faces through ball bearings, and it is difficult to obtain precise axial positioning. It cannot be assembled during the actual manufacturing process, and a large amount of leakage will occur at the bearings, further weakening the driving force of the turbine. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems existing in the prior art and provide a cuttings bed sand cleaner which is not affected by whether the drill tool rotates or not and can rotate automatically as long as the drilling fluid circulates normally, thereby efficiently and powerfully cleaning the cuttings bed.

[0006] In order to solve the above technical problems, a cuttings bed sand cleaner of the present invention comprises an upper joint, a sand cleaning power mechanism and a lower joint, wherein an upper joint water distribution chamber is provided on the upper part of the upper joint, a solid upper joint cylindrical section is provided below the upper joint water distribution chamber, a reduced diameter upper joint central axis is provided below the upper joint cylindrical section, and a lower end threaded section of the upper joint central axis is screwed into the inner screw hole of the lower joint; the sand cleaning power mechanism comprises a multi-stage turbine assembly and a sand cleaning drum, each stage of the turbine assembly comprises a turbine stator and a turbine rotor matched with each other, each turbine stator is stacked in sequence and sleeved on the outer periphery of the upper joint central axis, each turbine rotor is stacked in sequence and fixed to the inner wall of the sand cleaning drum, and a plurality of sand cleaning convex ridges are evenly provided on the outer wall of the sand cleaning drum; a plurality of upper joint flow holes are evenly distributed on the circumference of the bottom wall of the upper joint water distribution chamber, which are connected to the space where the turbine assembly is located, and a plurality of lower joint flow holes are evenly distributed on the circumference of the upper end surface of the lower joint, which are connected to the lower joint confluence chamber.

[0007] As an improvement of the present invention, an upper joint straightening section with an expanded diameter is provided on the upper outer periphery of the upper joint cylindrical section, an upper joint outer spiral groove is provided in the upper joint straightening section, and tungsten teeth are evenly embedded on the outer wall of the upper joint straightening section.

[0008] As a further improvement of the present invention, the top of the outer circumference of the uppermost turbine rotor abuts against the bottom of the rotor positioning step of the sand cleaning drum, and the rotor positioning step is located below the cylindrical section of the upper joint. The upper end of the sand cleaning drum is sleeved on the outer circumference of the cylindrical section of the upper joint, and an upper thrust bearing is installed on the inner step of the upper port of the sand cleaning drum. The top of the upper thrust bearing abuts against the bottom of the lower step of the upper joint straightening section through an upper bearing adjustment pad.

[0009] As a further improvement of the present invention, a plurality of drum water-permeable holes are evenly arranged on the upper circumference of the sand-cleaning drum, and the inner port of each drum water-permeable hole is communicated with the space where the upper thrust bearing is located.

[0010] As a further improvement of the present invention, the inner wall of the upper end of the sand cleaning drum is respectively embedded with a drum sealing ring and a drum wear-resistant ring from top to bottom, and the inner edges of the drum sealing ring and the drum wear-resistant ring abut against the outer wall of the upper joint cylindrical section.

[0011] As a further improvement of the present invention, the top of the inner circumference of the uppermost turbine stator abuts against the bottom of the stator retaining ring, the stator retaining ring abuts against the root of the shoulder below the cylindrical section of the upper joint, and the outer diameter of the stator retaining ring is smaller than the diameter of the circumference of the inner edge of each upper joint flow hole; the bottom of the inner circumference of the lowermost turbine stator abuts against the top of the stator sleeve, the stator sleeve is sleeved on the outer circumference of the central axis of the upper joint, and the bottom of the stator sleeve abuts against the upper end surface of the lower joint through a stator adjustment pad.

[0012] As a further improvement of the present invention, the bottom of the outer circumference of the lowermost turbine rotor abuts against the top of the rotor fixing sleeve, and the rotor fixing sleeve is sleeved on the upper outer periphery of the lower joint. The upper part of the rotor fixing sleeve is provided with a fixing sleeve external thread section, and the fixing sleeve external thread section is screwed with the internal thread of the lower port of the sand cleaning drum, and a rotor clamping pad is provided between the shoulder below the fixing sleeve external thread section and the lower port of the sand cleaning drum; a fixing sleeve wear-resistant ring and a fixing sleeve sealing ring are embedded in the inner wall of the rotor fixing sleeve, and the inner edges of the fixing sleeve wear-resistant ring and the fixing sleeve sealing ring both abut against the upper outer periphery of the lower joint, and the fixing sleeve sealing ring is located below the fixing sleeve wear-resistant ring.

[0013] As a further improvement of the present invention, a lower thrust bearing is installed below the inner step of the lower port of the rotor fixing sleeve, and the bottom of the lower thrust bearing is pressed against the upper step of the lower joint straightening section through a lower bearing adjustment pad; fixed sleeve water-permeable holes are evenly arranged on the lower circumference of the rotor fixing sleeve, and the inner port of each fixed sleeve water-permeable hole is communicated with the space where the lower thrust bearing is located.

[0014] As a further improvement of the present invention, the outer diameter of the lower joint straightening section is larger than the outer diameter of the rest of the lower joint, a lower joint outer spiral groove is provided in the lower joint straightening section, the rotation direction of the lower joint outer spiral groove is opposite to that of the upper joint outer spiral groove, and the outer wall of the lower joint straightening section is evenly embedded with tungsten teeth.

[0015] As a further improvement of the present invention, an upper joint tail shaft is connected below the central axis of the upper joint, and the upper joint tail shaft passes downward through the central hole of the lower joint. At least one tail shaft nut is screwed onto the lower end of the upper joint tail shaft, and the tail shaft nut is pressed on the top wall of the lower joint confluence cavity.

[0016] Compared with the prior art, the present invention has achieved the following beneficial effects: the drilling fluid enters the annular space where the turbine assemblies of each stage are located from the flow hole of the upper joint, the blades of the turbine rotor and the turbine stator have the same shape, but the bending direction is opposite, and the tool uses the reaction principle of turbine drive, that is, the part connected to the shaft serves as the turbine stator, and the part connected to the sleeve serves as the turbine rotor. The turbine stator plays a diversion role, directing the high-pressure fluid to the turbine rotor, impacting the blades of the turbine rotor, and pushing the turbine rotor to drive the sand cleaning drum to rotate, and the sand cleaning drum drives the sand cleaning ridges on the periphery to rotate, thereby scraping the cuttings and realizing mechanical sand cleaning; at the same time, the vortex generated between the upper and lower spiral grooves, one left-handed and one right-handed at both ends, realizes hydraulic sand cleaning. Under the combined action of mechanical sand cleaning and hydraulic sand cleaning, the sand particles in the cuttings bed can be scooped up and quickly taken away with the water flow, thereby realizing the removal of the cuttings bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings are only provided for reference and explanation and are not intended to limit the present invention.

[0018] Figure 1 It is a front view of the cuttings bed sand cleaner of the present invention; Figure 2 for Figure 1 Sectional view along AA; Figure 3 for Figure 2 Enlarged image of the upper middle part; Figure 4 for Figure 2 Enlarged view of the lower middle part; Figure 5 A three-dimensional diagram of a cuttings bed sand cleaner according to the present invention; In the figure: 1. Upper joint; 1a. Upper joint water distribution cavity; 1b. Upper joint flow hole; 1c. Upper joint outer spiral groove; 1d. Tungsten tooth; 1e. Upper joint cylindrical section; 1f. Upper joint central axis; 1g. Upper joint tail shaft; 1h. Tail shaft nut; 2. Sand cleaning drum; 2a. Rotor positioning step; 2b. Drum water permeable hole; 2c. Sand cleaning ridge; 2d. Drum wear ring; 2e. Drum sealing ring; 3. Upper thrust bearing; 3a. Upper bearing adjustment pad; 3b. Bearing upper pin; 3c. Shaft Lower bearing pin; 4. Turbine rotor; 5. Turbine stator; 5a. Stator retaining ring; 5b. Stator sleeve; 5c. Stator adjustment pad; 6. Rotor fixing sleeve; 6a. Fixing sleeve water permeable hole; 6b. Fixing sleeve wear-resistant ring; 6c. Fixing sleeve sealing ring; 6d. Rotor clamping pad; 7. Lower thrust bearing; 7a. Lower bearing adjustment pad; 7b. Bearing upper pin; 7c. Bearing lower pin; 8. Lower joint; 8a. Lower joint flow hole; 8b. Lower joint confluence chamber; 8c. Lower joint outer spiral groove; 8d. Tungsten tooth. DETAILED DESCRIPTION

[0019] In the following description of the present invention, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific direction.

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] like Figures 1 to 5As shown, the cuttings bed sand cleaner of the present invention comprises an upper joint 1, a sand cleaning power mechanism and a lower joint 8. The upper portion of the upper joint 1 is provided with a tapered female thread, which is screwed to the drill rod above; an upper joint water distribution chamber 1a is provided below the tapered female thread. The upper joint water distribution chamber 1a is narrow at the top and wide at the bottom, which makes the bottom area larger. On the one hand, it is beneficial to reduce the flow velocity at the bottom of the upper joint water distribution chamber 1a and increase the static pressure.

[0023] A solid upper joint cylindrical section 1e is provided below the upper joint water distribution cavity 1a, and an upper joint straightening section with an expanded diameter is provided on the upper outer periphery of the upper joint cylindrical section 1e to facilitate centering the tool; an upper joint outer spiral groove 1c is provided in the upper joint straightening section, and the upper joint outer spiral groove 1c is usually provided with three or four grooves for water flow to pass through and generate vortex flow, thereby increasing the flow rate and sand carrying capacity, and the outer wall of the upper joint straightening section is evenly embedded with tungsten teeth 1d to facilitate scraping and trimming the wellbore.

[0024] A reduced diameter upper joint center axis 1f is provided below the upper joint cylindrical section 1e. The upper joint center axis 1f extends downward along the axis of the sand cleaning power mechanism and serves as a fixed axis of the turbine stator 5. The lower end threaded section of the upper joint center axis 1f is screwed into the inner threaded hole of the lower joint 8, so that the upper joint 1 and the lower joint 8 are connected together.

[0025] The sand cleaning power mechanism includes a multi-stage turbine assembly and a sand cleaning drum 2. A plurality of upper joint flow holes 1b are evenly distributed on the circumference of the bottom wall of the upper joint water distribution chamber 1a, which are connected to the upper part of the space where the turbine assembly is located. Each stage of the turbine assembly includes a turbine stator 5 and a turbine rotor 4 that are matched with each other. The blades of the turbine rotor 4 and the turbine stator 5 have the same shape, but the bending direction is opposite. In the traditional turbine assembly, the outer cylinder and the drill pipe remain relatively stationary, and the central axis rotates. On the contrary, each turbine stator 5 is stacked in sequence and sleeved on the outer periphery of the upper joint central axis 1f, and the upper joint central axis 1f and the drill pipe remain relatively stationary.

[0026] The turbine rotors 4 are stacked in sequence and fixed to the inner wall of the sand cleaning drum 2. The drilling fluid, i.e., water, enters the flow holes 1b of the upper joints from the water distribution cavity 1a of the upper joint, and then enters the space where the turbine assemblies of each stage are located from the flow holes 1b of the upper joints, impacts the blades of the turbine rotor 4, and then, after being turned and diverted by the blades of the turbine stator 5, impacts the blades of the turbine rotor 4 of the next stage. The forces of the turbine rotors 4 act together on the sand cleaning drum 2, driving the sand cleaning drum 2 to rotate.

[0027] A plurality of sand cleaning ridges 2c are evenly arranged on the outer wall of the sand cleaning drum 2. When the sand cleaning drum 2 rotates, the sand cleaning ridges 2c can pick up sand particles, destroy and gradually remove the cuttings bed. Even if the drilling tool does not rotate, the self-rotation of the sand cleaning drum 2 under the action of hydraulic pressure can also play a role in mechanical sand cleaning.

[0028] The upper part of the lower joint 8 is a cylindrical section, the center of which is the lower joint internal screw hole, which is screwed to the lower end threaded section of the upper joint central axis 1f. Below the lower joint internal screw hole is a small diameter light hole for the upper joint tail shaft 1g to pass through. Below the light hole is the lower joint confluence cavity 8b, which is a structure with a wide top and a narrow bottom. A plurality of lower joint flow holes 8a are evenly distributed on the circumference of the upper end surface of the lower joint 8 and are connected to the lower joint confluence cavity 8b.

[0029] The upper joint tail shaft 1g is connected to the bottom of the upper joint center axis 1f, and the upper joint tail shaft 1g passes downward through the center hole of the lower joint 8. At least one tail shaft nut 1h is screwed on the lower end of the upper joint tail shaft 1g, and the tail shaft nut 1h is pressed on the top wall of the lower joint confluence cavity 8b to lock the upper joint tail shaft 1g.

[0030] The outer circumferential top of the uppermost turbine rotor 4 abuts against the rotor positioning step 2a of the sand cleaning drum 2, so that the upper end of the turbine assembly is axially positioned. The rotor positioning step 2a is located below the upper joint cylindrical section 1e, and the inner circumferential diameter of the rotor positioning step 2a is larger than the diameter of the circumference of the outer edge of each lower joint flow hole 8a to avoid blocking the water flow.

[0031] The upper end of the sand cleaning drum 2 is sleeved on the outer circumference of the upper joint cylindrical section 1e, and an upper thrust bearing 3 is installed on the inner step of the upper port of the sand cleaning drum 2. The upper cover of the upper thrust bearing 3 abuts against the bottom of the upper bearing adjustment pad 3a, and the upper bearing adjustment pad 3a abuts against the bottom of the lower step of the upper joint straightening section.

[0032] The upper bearing pin 3b axially passes through the upper cover of the upper thrust bearing 3 and the upper bearing adjustment pad 3a to fix the upper cover of the upper thrust bearing 3 with the lower step of the upper joint straightening section. The lower cover of the upper thrust bearing 3 abuts against the root of the inner step of the upper port of the sand cleaning drum 2 and is fixed by multiple lower bearing pins 3c.

[0033] A plurality of drum water holes 2b are evenly arranged on the upper circumference of the sand cleaning drum 2, the inner port of each drum water hole 2b is communicated with the space where the upper thrust bearing 3 is located, and the axis of each drum water hole 2b is located on the interface between the upper cover and the lower cover of the upper thrust bearing 3, so as to facilitate lubrication and cooling of the upper thrust bearing 3 by water flow.

[0034] The inner wall of the upper end of the sand cleaning drum 2 is embedded with a drum wear ring 2d. Two drum wear rings 2d are provided, and the inner wall cooperates with the outer wall of the upper joint cylindrical section 1e, which not only reduces the friction resistance, but also plays a role in straightening. Two drum seals 2e are provided above the drum wear ring 2d, and the inner edge of the drum seal 2e abuts against the outer wall of the upper joint cylindrical section 1e to prevent the leakage of drilling fluid in the space where the turbine assembly is located.

[0035] The top of the inner circumference of the uppermost turbine stator 5 abuts against the bottom of the stator retaining ring 5a, and the stator retaining ring 5a abuts against the root of the lower shoulder of the upper joint cylindrical section 1e. By grinding the thickness of the stator retaining ring 5a, the axial precision positioning of the upper end of the turbine stator 5 can be achieved. The outer diameter of the stator retaining ring 5a is smaller than the diameter of the circumference of the inner edge of each upper joint flow hole 1b to avoid blocking the water flow.

[0036] The inner circumferential bottom of the lowermost turbine stator 5 abuts against the top of the stator sleeve 5b, the stator sleeve 5b is sleeved on the outer circumference of the central axis 1f of the upper joint, and the bottom of the stator sleeve 5b abuts against the upper end surface of the lower joint 8 through the stator adjustment pad 5c, so as to achieve precise axial positioning of the lower end of the turbine stator 5. The annular space between the outer wall of the stator sleeve 5b and the inner wall of the rotor fixing sleeve 6 serves as a flow passage. The outer diameter of the stator sleeve 5b and the stator adjustment pad 5c is smaller than the diameter of the circumference of the inner edge of each lower joint flow hole 8a to avoid blocking the water flow.

[0037] The outer circumferential bottom of the lowermost turbine rotor 4 abuts against the top of the rotor fixing sleeve 6 to achieve axial positioning of the lower end of the turbine rotor 4. The rotor fixing sleeve 6 is sleeved on the upper outer circumference of the lower joint 8. The upper part of the rotor fixing sleeve 6 is provided with a fixing sleeve external thread section, which is screwed with the internal thread of the lower port of the sand cleaning drum 2. A rotor pressing pad 6d is provided between the shoulder below the fixing sleeve external thread section and the lower port of the sand cleaning drum 2. When the rotor fixing sleeve 6 is tightened, the rotor pressing pad 6d is pressed.

[0038] The inner wall of the rotor fixed sleeve 6 is embedded with a fixed sleeve wear ring 6b, usually two fixed sleeve wear rings 6b are provided, and the inner wall of the fixed sleeve wear ring 6b matches the outer wall of the lower joint cylindrical section. Two fixed sleeve sealing rings 6c are provided below the fixed sleeve wear ring 6b, and the inner edge of the fixed sleeve sealing ring 6c abuts against the outer circumference of the lower joint cylindrical section to achieve sealing between the rotor fixed sleeve 6 and the lower joint 8 to prevent the drilling fluid from leaking from here.

[0039] A lower thrust bearing 7 is installed below the inner step of the lower port of the rotor fixing sleeve 6, and the upper cover of the lower thrust bearing 7 is anchored on the step of the rotor fixing sleeve 6 through the bearing upper pin 7b; the bottom of the lower cover of the lower thrust bearing 7 is pressed against the upper step of the lower joint straightening section through the lower bearing adjustment pad 7a, and the bearing lower pin 7c passes through the pin holes of the lower cover of the lower thrust bearing 7 and the lower bearing adjustment pad 7a and is anchored on the upper part of the upper step of the lower joint straightening section.

[0040] Fixed sleeve water-permeable holes 6a are evenly arranged on the lower circumference of the rotor fixed sleeve 6. The inner port of each fixed sleeve water-permeable hole 6a is connected to the space where the lower thrust bearing 7 is located. The axis of the fixed sleeve water-permeable hole 6a is aligned with the upper and lower cover mating surfaces of the lower thrust bearing 7, which is convenient for cooling and lubricating the lower thrust bearing 7.

[0041] The outer diameter of the lower joint straightening section is larger than the outer diameter of the rest of the lower joint 8. The lower joint straightening section is provided with a lower joint outer spiral groove 8c. The outer wall of the lower joint straightening section is evenly embedded with tungsten teeth 8d, which is convenient for scraping and trimming the wellbore. The lower joint outer spiral groove 8c is usually symmetrically arranged with the upper joint outer spiral groove 1c and rotates in the opposite direction. After the water flows through the upper joint outer spiral groove 1c to generate a vortex in one direction, it flows through the straight grooves between the sand cleaning ridges 2c, and then flows through the lower joint outer spiral groove 8c in the other direction, which will generate a larger vortex and realize hydraulic sand cleaning.

[0042] The above is only a preferred embodiment of the present invention, which shows and describes the basic principles and main features of the present invention and the advantages of the present invention, but does not limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. In addition to the above embodiments, the present invention may have other implementation modes without departing from the spirit and scope of the present invention. The present invention may also have various changes and improvements, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents. The technical features not described in the present invention can be realized by or using existing technologies, which will not be repeated here.

Claims

1. A cuttings bed sand cleaner, comprising an upper joint, a sand cleaning power mechanism and a lower joint, characterized in that: An upper joint water distribution cavity is provided at the upper part of the upper joint, a solid upper joint cylindrical section is provided below the upper joint water distribution cavity, a reduced diameter upper joint central axis is provided below the upper joint cylindrical section, and a threaded section at the lower end of the upper joint central axis is screwed into the inner screw hole of the lower joint; The sand cleaning power mechanism comprises a multi-stage turbine assembly and a sand cleaning drum, each stage of the turbine assembly comprises a turbine stator and a turbine rotor that are matched with each other, each turbine stator is stacked in sequence and sleeved on the outer periphery of the central axis of the upper joint, each turbine rotor is stacked in sequence and fixed to the inner wall of the sand cleaning drum, and a plurality of sand cleaning convex ridges are evenly arranged on the outer wall of the sand cleaning drum; A plurality of upper joint flow holes are evenly distributed on the circumference of the bottom wall of the upper joint water distribution cavity and communicate with the space where the turbine assembly is located. A plurality of lower joint flow holes are evenly distributed on the circumference of the upper end surface of the lower joint and communicate with the lower joint confluence cavity.

2. The cuttings bed sand cleaner according to claim 1, characterized in that: An upper joint straightening section with an enlarged diameter is arranged on the upper outer periphery of the upper joint cylindrical section, an upper joint outer spiral groove is arranged in the upper joint straightening section, and tungsten teeth are evenly embedded on the outer wall of the upper joint straightening section.

3. The cuttings bed sand cleaner according to claim 2, characterized in that: The top of the outer circumference of the uppermost turbine rotor abuts against the bottom of the rotor positioning step of the sand cleaning drum, and the rotor positioning step is located below the cylindrical section of the upper joint. The upper end of the sand cleaning drum is sleeved on the outer circumference of the cylindrical section of the upper joint, and an upper thrust bearing is installed on the inner step of the upper port of the sand cleaning drum. The top of the upper thrust bearing abuts against the bottom of the lower step of the upper joint straightening section through an upper bearing adjustment pad.

4. The cuttings bed sand cleaner according to claim 3, characterized in that: A plurality of drum water-permeable holes are evenly arranged on the upper circumference of the sand-cleaning drum, and the inner port of each drum water-permeable hole is communicated with the space where the upper thrust bearing is located.

5. The cuttings bed sand cleaner according to claim 3, characterized in that: The inner wall of the upper end of the sand cleaning drum is respectively embedded with a drum sealing ring and a drum wear-resistant ring from top to bottom, and the inner edges of the drum sealing ring and the drum wear-resistant ring abut against the outer wall of the upper joint cylindrical section.

6. The cuttings bed sand cleaner according to claim 1, characterized in that: The top of the inner circumference of the uppermost turbine stator abuts against the bottom of the stator retaining ring, and the stator retaining ring abuts against the root of the lower shoulder of the cylindrical section of the upper joint, and the outer diameter of the stator retaining ring is smaller than the diameter of the circumference of the inner edge of each upper joint flow hole; the bottom of the inner circumference of the lowermost turbine stator abuts against the top of the stator sleeve, and the stator sleeve is sleeved on the outer circumference of the central axis of the upper joint, and the bottom of the stator sleeve abuts against the upper end surface of the lower joint through a stator adjustment pad.

7. The cuttings bed sand cleaner according to claim 1, characterized in that: The bottom of the outer circumference of the lowermost turbine rotor abuts against the top of the rotor fixing sleeve, and the rotor fixing sleeve is sleeved on the upper outer circumference of the lower joint. The upper part of the rotor fixing sleeve is provided with a fixing sleeve external thread section, and the fixing sleeve external thread section is screwed with the internal thread of the lower port of the sand cleaning drum, and a rotor clamping pad is provided between the shoulder below the fixing sleeve external thread section and the lower port of the sand cleaning drum; a fixing sleeve wear-resistant ring and a fixing sleeve sealing ring are embedded in the inner wall of the rotor fixing sleeve, and the inner edges of the fixing sleeve wear-resistant ring and the fixing sleeve sealing ring are both abutted against the upper outer circumference of the lower joint, and the fixing sleeve sealing ring is located below the fixing sleeve wear-resistant ring.

8. The cuttings bed sand cleaner according to claim 7, characterized in that: A lower thrust bearing is installed below the inner step of the lower port of the rotor fixing sleeve, and the bottom of the lower thrust bearing is pressed against the upper step of the lower joint straightening section through a lower bearing adjustment pad; fixed sleeve water-permeable holes are evenly arranged on the lower circumference of the rotor fixing sleeve, and the inner port of each fixed sleeve water-permeable hole is communicated with the space where the lower thrust bearing is located.

9. The cuttings bed sand cleaner according to claim 8, characterized in that: The outer diameter of the lower joint straightening section is larger than the outer diameter of the rest of the lower joint. A lower joint outer spiral groove is provided in the lower joint straightening section. The rotation direction of the lower joint outer spiral groove is opposite to that of the upper joint outer spiral groove. Tungsten teeth are evenly embedded on the outer wall of the lower joint straightening section.

10. The cuttings bed sand cleaner according to any one of claims 1 to 9, characterized in that: An upper joint tail shaft is connected below the upper joint central axis, and the upper joint tail shaft passes downward through the central hole of the lower joint. At least one tail shaft nut is screwed onto the lower end of the upper joint tail shaft, and the tail shaft nut is pressed on the top wall of the lower joint confluence cavity.

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