A centralizer device with spin cleaning and drag reduction composite functions

Abstract

The embodiment of the application provides a centralizer device with composite functions of self-rotation cleaning and drag reduction, and relates to the field of oil drilling and geological exploration. The device comprises a joint pipeline, a fluid pipeline, an upper centralizing wing piece assembly, an upper bearing assembly, a cyclone centralizing device, a lower bearing assembly, a lower centralizing wing piece assembly and a drill bit joint. The bottom of the joint pipeline is fixedly connected with the fluid pipeline. The upper centralizing wing piece assembly is fixedly installed on the outer side of the fluid pipeline and below the joint pipeline. The bottom of the upper centralizing wing piece assembly is provided with the upper bearing assembly. The bottom of the upper bearing assembly is provided with the cyclone centralizing device. The bottom of the cyclone centralizing device is provided with the lower bearing assembly. The cyclone centralizing device can be pushed to rotate by external fluid flow, so that cleaning liquid is generated to achieve a cleaning effect. The setting of the ball device and the drag reduction roller can effectively reduce friction. Therefore, the device can ensure self-cleaning and prolong the service life of the device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil drilling and geological exploration technology, in particular to a centralizer device with self-rotating cleaning and drag reduction composite functions. BACKGROUND

[0002] In recent years, with the continuous progress of oil and gas field exploration and development technology in China, the control accuracy of the borehole trajectory of the drilling assembly during drilling is increasingly improved. As the core component for ensuring the stability of the downhole drilling tool and effectively preventing well deviation, the centralizer is widely used, and its performance directly affects the success and efficiency of drilling operations.

[0003] However, at present, the centralizer faces many challenges in actual operation. On the one hand, the existing centralizer has two centralizing wings as the upward channel of cuttings, which is prone to mud pack and stuck pipe and other downhole complex conditions due to the large broken volume of cuttings, which not only increases the drilling risk, but also seriously restricts the drilling speed. On the other hand, the existing centralizer has a large friction between the working wall and the well wall or the drill pipe, which not only aggravates the wear of the centralizer itself, shortens its service life, but also increases energy loss, increases drilling cost, and seriously affects the continuity and efficiency of drilling operations.

[0004] In summary, the development of a new type of centralizer with self-cleaning function, which can significantly reduce the friction coefficient and stably operate in complex and harsh operating environments, can significantly improve the drilling efficiency.

[0005] Based on this, the present application is proposed. SUMMARY

[0006] According to an embodiment of the present application, a centralizer device with self-rotating cleaning and drag reduction composite functions is provided to solve the existing background problems.

[0007] In a first aspect of the present application, a centralizer device with self-rotating cleaning and drag reduction composite functions is provided.

[0008] The centralizer device with self-rotating cleaning and drag reduction composite functions comprises a joint pipe, a fluid pipe, an upper centralizing wing piece assembly, an upper bearing assembly, a cyclone centralizing device, a lower bearing assembly, a lower centralizing wing piece assembly and a drill bit joint.

[0009] The fluid pipe is fixedly connected to the bottom of the connector pipe; the upper centralizing vane assembly is fixedly installed on the outside of the fluid pipe and below the connector pipe; an upper bearing assembly is provided at the bottom of the upper centralizing vane assembly; a vortex centralizing device is installed at the bottom of the upper bearing assembly; a lower bearing assembly is installed at the bottom of the vortex centralizing device; a lower centralizing vane assembly is installed at the bottom of the lower bearing assembly, and the lower centralizing vane assembly is fixedly installed on the outside of the fluid pipe; a drill bit connector is installed at the bottom of the lower centralizing vane assembly.

[0010] Preferably, the fluid pipeline comprises: a pipeline body and a flow outlet; there are four flow outlets, which are equidistantly located on the pipeline body along the circumference.

[0011] Preferably, the swirl straightening device includes: a main body, a twisted T-shaped guide groove, a side ball bearing device, and a flow guiding nozzle;

[0012] The upper and lower ends of the main body are fixedly connected to the upper bearing assembly and the lower bearing assembly, respectively; there are four twisted T-shaped guide grooves, which are respectively installed on the outer surface of the main body, and the four twisted T-shaped guide grooves are respectively arranged equidistantly around the main body in the circumferential direction; each twisted T-shaped guide groove has a vertical opening, the position of which is opposite to the height of the drainage port opening; three side ball bearing devices are evenly distributed on each twisted T-shaped guide groove; there are a total of eight drainage nozzles, which are respectively installed on the upper and lower surfaces of the four twisted T-shaped guide grooves, and the drainage nozzles are inclined; the drainage nozzles are tapered.

[0013] The outer side of the twisted T-shaped guide groove is provided with a groove for embedding the side ball bearing device.

[0014] Preferably, the side ball device includes: a side ball groove and side balls;

[0015] The side ball groove is a groove with an annular sealing structure; the side ball is placed in the arc-shaped raceway of the side ball groove, and the length of the side ball extending out of the side ball groove is less than its own radius.

[0016] Preferably, the upper straightening wing assembly includes: a body, a straightening wing, a roller groove, a drag-reducing roller, and a ball bearing device;

[0017] The inner surface of the body is fixedly connected to the fluid pipe; there are four straightening vanes, which are equidistantly distributed along the circumference on the outer surface of the body; there are four roller grooves, which are respectively opened within the four straightening vanes; the drag-reducing rollers comprise four sets, which are respectively installed in the roller grooves; each of the four straightening vanes has three grooves on the upper and lower end walls of the roller grooves, and ball bearing devices are embedded in the grooves.

[0018] Preferably, the drag-reducing roller includes: a roller bracket, a bearing, and a drum;

[0019] There are two roller brackets, which are symmetrically installed on the upper and lower walls of the roller groove; there are cylindrical grooves reserved on the opposite side of the two roller brackets, and there are two bearings, which are rotatably installed in the cylindrical grooves reserved in the two roller brackets respectively; the two bearings are respectively inserted into the journals at both ends of the roller.

[0020] Preferably, the ball bearing device includes: a ball bearing groove and drag-reducing balls; the drag-reducing balls are placed in the ball bearing groove.

[0021] Preferably, the upper bearing assembly includes: a shaft ring, a cage, rolling elements, a shaft seat, and a bearing seat;

[0022] The bearing seat is installed at the bottom of the upper straightening vane assembly, and the center line of the bearing seat coincides with the axis of the upper straightening vane assembly and the fluid pipe. The bearing ring is installed at the top inner side of the bearing seat, and the inner surface of the bearing ring is tightly connected to the fluid pipe. The seat ring is installed at the bottom inner side of the bearing seat, and the outer circular surface of the seat ring is tightly fitted with the bottom end of the inner surface of the bearing seat. The retainer has a circular ring structure and is installed in the annular space between the bearing ring and the seat ring. The retainer has a plurality of ball grooves, and there are a plurality of rolling elements, which are equidistantly embedded in the plurality of ball grooves on the retainer along the circumference. The rolling elements are cylindrical and their upper ends are in rolling contact with the lower surface of the bearing ring.

[0023] Preferably, the lower straightening vane assembly and the upper straightening vane assembly are symmetrically arranged with respect to the swirl straightening device; the lower straightening vane assembly includes: a lower body, a lower straightening vane, a lower roller groove, a lower drag-reducing roller, and a lower ball bearing device;

[0024] The inner surface of the lower body is fixedly connected to the fluid pipe; there are four lower straightening vanes, which are equidistantly distributed along the circumference on the outer surface of the lower body; there are four lower roller grooves, which are respectively opened within the four lower straightening vanes; the lower drag-reducing rollers comprise four sets, which are respectively installed in the lower roller grooves; each of the four lower straightening vanes has three linearly arranged cylindrical grooves on the upper and lower end walls of the lower roller grooves, and the lower ball bearing device is embedded in the grooves.

[0025] Preferably, the lower bearing assembly includes: a lower bearing ring, a lower cage, lower rolling elements, a lower bearing seat, and a lower bearing seat ring;

[0026] The lower bearing seat is installed at the top of the lower straightening vane assembly, and the center line of the lower bearing seat coincides with the axis of the lower straightening vane assembly and the fluid pipe. The lower bearing ring is installed at the bottom inner side of the bearing seat, and the inner surface of the lower bearing ring is tightly connected to the fluid pipe. The lower seat ring is installed at the top inner side of the lower bearing seat, and the outer circular surface of the lower seat ring is tightly fitted with the top of the inner surface of the lower bearing seat. The lower retainer has a circular ring structure and is installed in the annular space between the lower bearing ring and the seat ring. The lower retainer has a plurality of ball grooves, and there are a plurality of lower rolling elements, which are equidistantly embedded in the plurality of ball grooves on the lower retainer along the circumference, wherein the lower rolling elements are spheres and their bottom ends are in rolling contact with the upper surface of the lower bearing ring.

[0027] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0028] 1. The present invention provides a centralizer device with a combined function of self-rotating cleaning and drag reduction, wherein a transverse drain port is provided on the fluid pipeline, and a guide groove is provided on the vortex centralizer device at the same position. When the drain port on the vortex centralizer device corresponds to the groove opening on the guide groove, the fluid will flow out along the guide groove, thereby providing liquid for cleaning the mud pack.

[0029] 2. The vortex straightening device of this invention is equipped with an inclined guide channel. Utilizing fluid motion, it can generate thrust based on its unique structural design, driving the vortex straightening device to rotate automatically. During rotation, a cleaning liquid is continuously generated, effectively circumferentially rinsing the mud on the surface of the straightening blades, achieving automatic cleaning.

[0030] 3. In this invention, the drainage nozzle adopts an inclined angle design and a tapered nozzle design. This design can effectively improve the rinsing force, expand the cleaning range, and reduce fluid resistance. While ensuring the cleaning effect, it can reduce system energy consumption and improve resource utilization efficiency.

[0031] 4. The present invention is equipped with ball bearing devices and drag-reducing rollers at different orientations and angles to ensure that the stabilizer effectively reduces friction with the wall surface when rotating and moving up and down. In addition, the height of the ball bearing devices is also different, which allows the device to flexibly adapt to complex uneven wall surfaces, significantly extend the service life of the device, reduce the frequency of equipment replacement, and save costs.

[0032] In summary, this invention utilizes external fluid flow to drive the vortex-stabilizing device to rotate, thereby producing a cleaning liquid and achieving a cleaning effect. Simultaneously, the ball bearing device and drag-reducing rollers effectively reduce friction and resistance. This design ensures self-cleaning while extending the device's service life.

[0033] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0034] The above and other features, advantages, and aspects of the various embodiments of the present invention will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0035] Figure 1 A front view of a centralizer device with a combined self-rotating cleaning and drag reduction function according to an embodiment of the present invention is shown;

[0036] Figure 2 A front view schematic diagram of a centralizer device with a combined self-rotating cleaning and drag reduction function according to an embodiment of the present invention is shown.

[0037] Figure 3 A top view schematic diagram of a structure with a self-rotating cleaning and drag reduction combined function according to an embodiment of the present invention is shown;

[0038] Figure 4 A front cross-sectional view of a device with a self-rotating cleaning and drag reduction combined function according to an embodiment of the present invention is shown.

[0039] Figure 5 A front view of an upper straightening vane assembly with a self-rotating cleaning and drag reduction combined function according to an embodiment of the present invention is shown.

[0040] Figure 6 A perspective view of an upper straightening vane assembly with a self-rotating cleaning and drag reduction combined function according to an embodiment of the present invention is shown;

[0041] Figure 7 A schematic diagram of a drag-reducing roller with a combined self-rotating cleaning and drag-reducing function according to an embodiment of the present invention is shown.

[0042] Figure 8 A schematic diagram of the structure of an upper bearing assembly with a combined self-rotating cleaning and drag reduction function according to an embodiment of the present invention is shown.

[0043] Figure 9 A front view of a vortex straightening device with a combined self-rotating cleaning and drag reduction function according to an embodiment of the present invention is shown;

[0044] Figure 10 A perspective view of a flow straightening device with a combined self-rotating cleaning and drag reduction function according to an embodiment of the present invention is shown.

[0045] The attached figures are labeled as follows:

[0046] 1. Connecting pipes;

[0047] 2. Fluid pipeline; 2-1. Pipeline body; 2-2. Drainage port;

[0048] 3. Upper straightening vane assembly; 3-a. Body; 3-1. Straightening vane; 3-2. Roller groove; 3-3. Drag-reducing roller; 3-3-1. Roller bracket; 3-3-2. Bearing; 3-3-3. Roller; 3-4. Drag-reducing ball; 3-4-1. Ball groove; 3-4-2. Drag-reducing ball;

[0049] 4. Upper bearing assembly; 4-1. Shaft ring; 4-2. Cage; 4-3. Rolling elements; 4-4. Shaft seat; 4-5. Seat ring;

[0050] 5. Swirl straightening device; 5-a. Main body; 5-1. Twisted T-shaped guide groove; 5-2. Side ball bearing device; 5-2-1. Ball bearing groove; 5-2-2. Ball bearing; 5-3. Drain nozzle;

[0051] 6. Lower bearing assembly; 6-1. Lower shaft ring; 6-2. Lower cage; 6-3. Lower rolling element; 6-4. Lower shaft seat; 6-5. Lower seat ring;

[0052] 7. Lower straightening wing assembly; 7-a. Lower body; 7-1. Lower straightening wing; 7-2. Lower roller groove; 7-3. Lower drag-reducing roller; 7-3-1. Lower roller bracket; 7-3-2. Lower bearing; 7-3-3. Lower roller; 7-4. Lower ball bearing assembly;

[0053] 8. Drill bit connector. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0056] like Figure 1 , Figure 2 and Figure 3As shown, the centralizer device with self-rotating cleaning and drag reduction combined functions includes: a connector pipe 1, a fluid pipe 2, an upper centralizer blade assembly 3, an upper bearing assembly 4, a vortex centralizer 5, a lower bearing assembly 6, a lower centralizer blade assembly 7, and a drill bit connector 8. The connector pipe 1 has an opening and threads on its inner surface, allowing the drill rod of an external device to be fixedly connected to the connector pipe 1 via these threads. The fluid pipe 2 is fixedly connected to the bottom of the connector pipe 1. The fluid pipe 2 consists of a pipe body 2-1 and four outlets 2-2, equidistantly spaced circumferentially on the pipe body 2-1. The outlets 2-2 are horizontally positioned to increase the contact area, ensuring more fluid is output through the outlets 2-2 when the fluid passes through the pipe body 2-1. The upper centralizer blade assembly 3 is fixedly installed on the outside of the fluid pipe 2 and below the connector pipe 1. An upper bearing assembly 4 is located at the bottom of the upper centralizer blade assembly 3 and is installed on the outside of the fluid pipe 2. A vortex straightening device 5 is installed at the bottom of the upper bearing assembly 4. A lower bearing assembly 6 is installed at the bottom of the vortex straightening device 5, and the lower bearing assembly 6 is installed on the outside of the fluid pipe 2. The vortex straightening device 5 is rotatably installed on the outside of the fluid pipe 2 through the upper bearing assembly 4 and the lower bearing assembly 6. The upper bearing assembly 4 and the lower bearing assembly 6 ensure that the vortex straightening device 5 can rotate relative to the fluid pipe 2, thereby realizing the swirling ejection of fluid. A lower straightening vane assembly 7 is installed at the bottom of the lower bearing assembly 6, and the lower straightening vane assembly 7 is fixedly installed on the outside of the fluid pipe 2. The arrangement of the upper straightening vane assembly 3 and the lower straightening vane assembly 7 can effectively prevent the pipe string from deflecting. A drill bit connector 8 is installed at the bottom of the lower straightening vane assembly 7. The inner surface of the drill bit connector 8 is connected to the outer surface of the fluid pipe 2, and the outer surface of the drill bit connector 8 is threaded, so that external drilling tools can be connected to the drill bit connector 8 through the threads. The upper straightening vane assembly 3, the upper bearing assembly 4, the vortex straightening device 5, the lower bearing assembly 6, the lower straightening vane assembly 7, and the drill bit connector 8 are coaxially arranged with the fluid pipeline 2.

[0057] like Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, the upper straightening vane assembly 3 includes a body 3-a, straightening vanes 3-1, roller grooves 3-2, drag-reducing rollers 3-3, and a ball bearing device 3-4. The inner surface of the body 3-a is fixedly connected to the fluid pipe 2. There are four straightening vanes 3-1, which are equidistantly distributed circumferentially on the outer surface of the body 3-a, with adjacent vanes having an included angle of 90° to ensure omnidirectional force balance and straighten the pipe column. There are four roller grooves 3-2, which are respectively opened within the four straightening vanes 3-1, and the grooves of the roller grooves 3-2 have a rectangular through structure. There are four sets of drag-reducing rollers 3-3, which are installed in the roller grooves 3-2 in a one-to-one correspondence with the number of roller grooves 3-2. Each set of drag-reducing rollers 3-3 consists of a roller bracket 3-3-1, a bearing 3-3-2, and a roller 3-3-3. There are two roller supports 3-3-1, which are L-shaped components, symmetrically installed on the upper and lower walls of the roller groove 3-2. The distance between the two roller supports 3-3-1 matches the length of the roller 3-3-3. Cylindrical grooves are pre-reserved on opposite sides of the two roller supports 3-3-1. Two bearings 3-3-2 are provided, rotatably installed within the pre-reserved cylindrical grooves of the two roller supports 3-3-1. The two bearings 3-3-2 are inserted into the journals at both ends of the roller 3-3-3, ensuring that the roller 3-3-3 can rotate freely around the axis of the bearings 3-3-2. The outer side of the roller 3-3-3 extends out of the inner cavity of the roller groove 3-2, ensuring contact between the roller 3-3-3 and the rock wall surface and reducing friction on the main body 3-a. Each of the four straightening vanes 3-1 has three linearly arranged cylindrical grooves on the upper and lower end walls of the roller grooves 3-2. A ball bearing device 3-4 is embedded within each groove, comprising a ball groove 3-4-1 and drag-reducing balls 3-4-2. The ball groove 3-4-1 is installed within the cylindrical groove, and the drag-reducing balls 3-4-2 are placed within the ball groove 3-4-1, coaxial with it. The drag-reducing balls 3-4-2 can roll freely within the ball groove 3-4-1, which effectively limits their movement, preventing them from derailing from the track. A circular ring is fixed on the ball groove 3-4-1, with a diameter that is the same as the size of the cylindrical groove, to ensure a sealed installation. The diameter of the drag-reducing ball 3-4-2 extending out of the circular ring is smaller than its own radius to prevent the drag-reducing ball 3-4-2 from coming out.

[0058] Understandably, in this embodiment, the upper centralizing vane assembly 3 effectively reduces friction between itself and the rock wall through the coordinated design of the drag-reducing roller 3-3 and the ball bearing device 3-4. Specifically, the roller 3-3-3 of the drag-reducing roller 3-3 protrudes from the roller groove 3-2 and can directly contact the rock wall, converting sliding friction into rolling friction; the drag-reducing balls 3-4-2 in the ball bearing device 3-4 can roll freely within the ball bearing groove 3-4-1, further reducing contact resistance. In addition, the inner surface of the body 3-a of the upper centralizing vane assembly 3 is connected to the fluid pipe 2, and the contact and limiting of the drag-reducing roller 3-3 and the ball bearing device 3-4 with the inner wall of the well allows the upper centralizing vane assembly 3 to enter the well vertically as a whole, thereby preventing the tubing from deviating or sticking to the wall.

[0059] like Figure 8 , Figure 9 As shown, the upper bearing assembly 4 includes a shaft ring 4-1, a cage 4-2, rolling elements 4-3, a bearing seat 4-4, and a seat ring 4-5. The bearing seat 4-4 is installed at the bottom of the upper centralizing vane assembly 3 and is fixedly connected to the bottom of the upper centralizing vane assembly 3. The bearing seat 4-4 has a hollow cylindrical structure. The upper end of the bearing seat 4-4 is annular, and the inner ring of the annular ring is tightly fitted with the fluid pipe 2 to form a sealed whole. The lower end is an annular opening. The centerline of the bearing seat 4-4 coincides with the axis of the upper centralizing vane assembly 3 and the fluid pipe 2. The shaft ring 4-1 is installed on the inner top of the bearing seat 4-4, and the inner surface of the shaft ring 4-1 is tightly connected to the fluid pipe 2 in a fixed state. Seat ring 4-5 is installed on the inner bottom end of shaft seat 4-4. The outer circular surface of seat ring 4-5 is tightly fitted with the bottom end of the inner surface of shaft seat 4-4. Seat ring 4-5 can rotate relative to shaft seat 4-4 while maintaining a sealing effect during rotation. The inner diameter of seat ring 4-5 is larger than the inner diameter of shaft ring 4-1, ensuring a gap between seat ring 4-5 and the swirl straightening device 5 at its bottom end and the fluid pipe 2 to avoid interference. This also ensures that seat ring 4-5 and swirl straightening device 5 can rotate relative to the fluid pipe 2. The positioning stop formed by the lower surface of seat ring 4-5 and the lower end of shaft seat 4-4 is used for positioning and engaging with the upper end of swirl straightening device 5. Cage 4-2 has a ring-shaped structure and is installed in the annular space between shaft ring 4-1 and seat ring 4-5. The cage 4-2 has several ball grooves, and there are several rolling elements 4-3, which are equidistantly embedded in the ball grooves on the cage 4-2 along the circumference. The rolling elements 4-3 are cylindrical and their upper ends are in rolling contact with the lower surface of the shaft ring 4-1. The rolling elements 4-3 can roll freely in the ball grooves, thereby ensuring that the entire seat ring 4-5 can rotate smoothly.

[0060] Understandably, in this embodiment, the upper bearing assembly 4 is installed entirely below the upper straightening vane assembly 3. The inner surface of the shaft ring 4-1 is tightly connected to the fluid pipe 2 and is in a fixed state. The inner diameter of the seat ring 4-5 is larger than the inner diameter of the shaft ring 4-1, and there is a gap between the seat ring 4-5 and the fluid pipe 2, ensuring that the seat ring 4-5 can rotate without interference with the fluid pipe 2. The bottom end of the seat ring 4-5 is connected to the vortex straightening device 5. Therefore, the vortex straightening device 5 can rotate independently relative to the fluid pipe 2, the upper straightening vane assembly 3, and the lower straightening vane assembly 7.

[0061] like Figure 4 As shown, the lower straightening vane assembly 7 and the upper straightening vane assembly 3 are symmetrically arranged relative to the swirl straightening device 5. The lower straightening vane assembly 7 includes a lower body 7-a, lower straightening vanes 7-1, lower roller grooves 7-2, lower drag-reducing rollers 7-3, and a lower ball bearing device 7-4. The inner surface of the lower body 7-a is fixedly connected to the fluid pipe 2. There are four lower straightening vanes 7-1, which are equidistantly distributed circumferentially on the outer surface of the lower body 7-a, with adjacent vanes having an included angle of 90° to ensure omnidirectional force balance and straighten the pipe column. There are four lower roller grooves 7-2, which are respectively opened within the four lower straightening vanes 7-1, and the grooves of the lower roller grooves 7-2 have a rectangular through structure. There are four sets of lower drag-reducing rollers 7-3, which are installed in the lower roller grooves 7-2 in a one-to-one correspondence with the number of lower roller grooves 7-2. Each set of lower drag-reducing rollers 7-3 consists of a lower roller bracket 7-3-1, a lower bearing 7-3-2, and a lower roller 7-3-3. There are two lower roller brackets 7-3-1, which are L-shaped components, symmetrically installed on the upper and lower walls of the lower roller groove 7-2. The distance between the two lower roller brackets 7-3-1 matches the length of the lower roller 7-3-3, and cylindrical grooves are reserved on opposite sides of the two lower roller brackets 7-3-1. Two lower bearings 7-3-2 are provided, rotatably installed within the reserved cylindrical grooves of the two lower roller brackets 7-3-1. The two lower bearings 7-3-2 are inserted into the journals at both ends of the lower roller 7-3-3, ensuring that the lower roller 7-3-3 can rotate freely around the axis of the lower bearing 7-3-2. The outer side of the lower roller 7-3-3 extends out of the inner cavity of the lower roller groove 7-2, ensuring that the lower roller 7-3-3 contacts the rock wall and reducing friction on the lower body 7-a. Each of the four lower straightening vanes 7-1 has three linearly arranged cylindrical grooves on the upper and lower end walls of the lower roller grooves 7-2. The grooves are fitted with lower ball bearing devices 7-4, and the structure of the lower ball bearing devices 7-4 is the same as that of the ball bearing devices 3-4.

[0062] Understandably, in this embodiment, the use of drag-reducing rollers 7-3 and ball bearing devices 7-4 avoids friction with the rock wall. Furthermore, the inner surface of the body 7-a in the lower centralizing vane assembly 7 is connected to the fluid pipe 2, and the drag-reducing rollers 3-3 and 3-4, along with their contact and limiting with the borehole wall, ensure that the lower centralizing vane assembly 7 enters the borehole vertically, thus preventing pipe string deviation or adhesion to the wall. Moreover, the lower centralizing vane assembly 7 has the same structure as the upper centralizing vane assembly 3 and is symmetrically arranged relative to the vortex centralizing device 5, ensuring uniform and stable force distribution across the entire device.

[0063] like Figure 9 As shown, the lower bearing assembly 6 includes a lower bearing ring 6-1, a lower cage 6-2, a lower rolling element 6-3, a lower bearing seat 6-4, and a lower bearing ring 6-5. The lower bearing seat 6-4 is installed at the top of the lower centralizing vane assembly 7. The lower bearing seat 6-4 has a hollow cylindrical structure. The bottom of the lower bearing seat 6-4 is annular, and the inner ring of the annular ring is tightly fitted with the fluid pipe 2 to form a sealed whole. The top is an annular opening. The centerline of the lower bearing seat 6-4 coincides with the axis of the lower centralizing vane assembly 7 and the fluid pipe 2. The lower bearing ring 6-1 is installed on the inner bottom of the bearing seat 6-4, and the inner surface of the lower bearing ring 6-1 is tightly connected to the fluid pipe 2, in a fixed state. The lower seat ring 6-5 is installed on the inner top of the lower shaft seat 6-4. The outer circular surface of the lower seat ring 6-5 is tightly fitted with the top of the inner surface of the lower shaft seat 6-4. The lower seat ring 6-5 can rotate relative to the lower shaft seat 6-4 while maintaining a sealing effect during rotation. The inner diameter of the lower seat ring 6-5 is larger than the inner diameter of the lower shaft ring 6-1, ensuring a gap between the lower seat ring 6-5 and the swirl straightening device 5 at its top and the fluid pipe 2 to avoid interference, while also ensuring relative rotation between the lower seat ring 6-5 and the fluid pipe 2. The positioning stop formed by the upper surface of the lower seat ring 6-5 and the upper end of the lower shaft seat 6-4 is used for positioning and engaging with the lower end of the swirl straightening device 5. The lower retainer 6-2 has a circular structure and is installed in the annular space between the lower shaft ring 6-1 and the seat ring 6-5. The lower retainer 6-2 has several ball grooves, and there are several lower rolling elements 6-3, which are equidistantly embedded in the ball grooves on the lower retainer 6-2 along the circumference. The lower rolling elements 6-3 are cylindrical and their bottom ends roll in contact with the upper surface of the lower bearing ring 6-1. The lower rolling elements 6-3 can roll freely in the ball grooves, thereby ensuring that the lower bearing ring 6-5 can rotate smoothly as a whole.

[0064] Understandably, in this embodiment, the lower bearing assembly 6 is mounted entirely above the lower straightening vane assembly 7. It and the upper bearing assembly 4 are symmetrically arranged with respect to the vortex straightening device 5 and have the same structure. Together, they ensure that the vortex straightening device 5 rotates smoothly relative to the fluid pipe 2. The inner surface of the lower shaft ring 6-1 is tightly connected to the fluid pipe 2 and is in a fixed state. The inner diameter of the lower seat ring 6-5 is larger than the inner diameter of the lower shaft ring 6-1, and there is a gap between it and the fluid pipe 2, ensuring that the lower seat ring 6-5 can rotate without interference with the fluid pipe 2. The top of the lower seat ring 6-5 is connected to the vortex straightening device 5. Therefore, the vortex straightening device 5 can rotate independently relative to the fluid pipe 2, the upper straightening vane assembly 3, and the lower straightening vane assembly 7.

[0065] like Figure 9 , Figure 10 As shown, the vortex straightening device 5 includes a main body 5-a, a twisted T-shaped guide groove 5-1, a side ball bearing device 5-2, and a flow-guiding nozzle 5-3. The upper and lower ends of the main body 5-a are fixedly connected to the upper bearing assembly 4 and the lower bearing assembly 6, respectively, and the main body 5-a is located outside the fluid pipeline 2. There are four twisted T-shaped guide grooves 5-1, each installed on the outer surface of the main body 5-a. The four twisted T-shaped guide grooves 5-1 are equidistantly arranged around the main body 5-a circumferentially, with a twist angle of 45 degrees. Each twisted T-shaped guide groove 5-1 has a vertical opening, positioned opposite the height of the opening of the flow-guiding port 2-2, ensuring that after the fluid enters the main body 2-1, it can enter each guide groove 5-1 through the flow-guiding port 2-2. A gap exists between the main body 5-a and the fluid pipeline 2, effectively avoiding frictional losses caused by contact during device rotation. The outer side of the twisted T-shaped guide groove 5-1 has a groove for embedding the side ball bearing device 5-2. Three side ball bearing devices 5-2 are evenly distributed on each twisted T-shaped guide groove 5-1, for a total of 12. The side ball bearing device 5-2 consists of a side ball bearing groove 5-2-1 and side balls 5-2-2. The side ball bearing groove 5-2-1 is a groove with an annular sealing structure, and its outer diameter fits tightly with the cylindrical groove. The side balls 5-2-2 are placed within the arc-shaped raceway of the side ball bearing groove 5-2-1. The length of the side balls 5-2-2 extending out of the side ball bearing groove 5-2-1 is less than their own radius. The raceway structure design effectively limits the side balls 5-2-2 in all directions, preventing them from detaching from the track. There are a total of 8 flow nozzles 5-3, which are installed on the upper and lower surfaces of the four twisted T-shaped guide grooves 5-1. The flow nozzle 5-3 is directly opposite the outlet of the twisted T-shaped flow guide groove 5-1, and the flow nozzle 5-3 is inclined. At the same time, the flow nozzle 5-3 adopts a tapered structure design.

[0066] It is understood that in this embodiment, the vortex straightening device 5 is installed between the upper bearing assembly 4 and the lower bearing assembly 6. The vortex straightening device 5 is provided with a tortuous T-shaped guide groove 5-1. Utilizing the impact of externally flowing drilling fluid or other fluids, the vortex straightening device 5 rotates around its own axis, and the internal cleaning fluid or other fluids assist in the overall rotation of the vortex straightening device 5. Specifically, as external fluid flows across the surface of the vortex straightening device 5, the tortuous T-shaped guide groove 5-1, being tortuous at a 45-degree angle, creates an inclined angle with the fluid contact surface, thus generating a lateral thrust, causing the vortex straightening device 5 to begin rotating. During this process, the internal fluid enters the pipeline body 2-1. Most of the fluid is output through the drill bit connector 8, and a small portion of the fluid enters the gap between the main body 5-a and the fluid pipeline 2 through the inlet 2-2. As the vortex straightening device 5 rotates, when the opening of the twisted T-shaped guide groove 5-1 corresponds to the position of the inlet 2-2, the fluid in the fluid pipeline 2 and the fluid remaining in the gap will enter through the opening of the twisted T-shaped guide groove 5-1 and finally be ejected through the inlet nozzle 5-3. Since both the twisted T-shaped guide groove 5-1 and the inlet nozzle 5-3 are inclined, the ejected water flow will also generate lateral thrust when it acts on the drill wall. This, in turn, will assist the rotation of the main body 5-a through the reaction force, increasing the rotation speed and achieving circumferential cleaning of the mud packs on the upper straightening vane assembly 3 and the lower straightening vane assembly 7. When the fluid is ejected through the inlet nozzle 5-3, which rotates together with the vortex straightening device 5, its tapering structure can further generate a high-speed, large-angle jet of water. In addition, the ball bearing device 5-2 is installed on the twisted T-shaped guide groove 5-1, which can reduce the friction between the upper straightening vane assembly 3, the upper bearing assembly 4, the lower bearing assembly 6, the lower straightening vane assembly 7 and the drill bit joint 8 and the rock wall.

[0067] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A centralizer device with a combined function of self-rotating cleaning and drag reduction, characterized in that, include: Connector pipes, fluid pipes, upper centralizing vane assembly, upper bearing assembly, vortex centralizing device, lower bearing assembly, lower centralizing vane assembly, and drill bit connectors; The fluid pipe is fixedly connected to the bottom of the connector pipe; the upper centralizing vane assembly is fixedly installed on the outside of the fluid pipe and below the connector pipe; an upper bearing assembly is provided at the bottom of the upper centralizing vane assembly; a vortex centralizing device is installed at the bottom of the upper bearing assembly; a lower bearing assembly is installed at the bottom of the vortex centralizing device; a lower centralizing vane assembly is installed at the bottom of the lower bearing assembly, and the lower centralizing vane assembly is fixedly installed on the outside of the fluid pipe; a drill bit connector is installed at the bottom of the lower centralizing vane assembly. The fluid pipeline comprises a pipeline body and inlets; there are four inlets, which are equidistantly located on the pipeline body along the circumference. The swirl straightening device includes: a main body, a twisted T-shaped guide groove, a side ball bearing device, and a flow guiding nozzle; There is a gap between the main body and the fluid pipeline; the upper and lower ends of the main body are fixedly connected to the upper bearing assembly and the lower bearing assembly, respectively; there are four twisted T-shaped guide grooves, which are respectively installed on the outer surface of the main body, and the four twisted T-shaped guide grooves are respectively arranged equidistantly around the main body in the circumferential direction, with a twist angle of 45 degrees; each twisted T-shaped guide groove is provided with a vertical opening, the position of which is opposite to the height position of the drainage port opening; three side ball bearing devices are evenly distributed on each twisted T-shaped guide groove; there are a total of eight drainage nozzles, which are respectively installed on the upper and lower surfaces of the four twisted T-shaped guide grooves, and the drainage nozzles are inclined; the drainage nozzles are tapered. The outer side of the twisted T-shaped guide groove is provided with a groove for embedding the side ball bearing device.

2. The centralizer device with self-rotating cleaning and drag reduction combined functions according to claim 1, characterized in that, The side ball bearing device includes: a side ball bearing groove and side balls; The side ball groove is a groove with an annular sealing structure; the side ball is placed in the arc-shaped raceway of the side ball groove, and the length of the side ball extending out of the side ball groove is less than its own radius.

3. The centralizer device with self-rotating cleaning and drag reduction combined functions according to claim 1 or 2, characterized in that, The upper straightening wing assembly includes: a body, a straightening wing, a roller groove, a drag-reducing roller, and a ball bearing device; The inner surface of the body is fixedly connected to the fluid pipe; there are four straightening vanes, which are equidistantly distributed along the circumference on the outer surface of the body; there are four roller grooves, which are respectively opened within the four straightening vanes; the drag-reducing rollers comprise four sets, which are respectively installed in the roller grooves; each of the four straightening vanes has three grooves on the upper and lower end walls of the roller grooves, and ball bearing devices are embedded in the grooves.

4. The centralizer device with self-rotating cleaning and drag reduction combined functions according to claim 3, characterized in that, The drag-reducing roller includes: a roller bracket, a bearing, and a drum; There are two roller brackets, which are symmetrically installed on the upper and lower walls of the roller groove; there are cylindrical grooves reserved on the opposite side of the two roller brackets, and there are two bearings, which are rotatably installed in the cylindrical grooves reserved in the two roller brackets respectively; the two bearings are respectively inserted into the journals at both ends of the roller.

5. The centralizer device with self-rotating cleaning and drag reduction combined functions according to claim 4, characterized in that, The ball bearing device includes: a ball bearing groove and drag-reducing balls; the drag-reducing balls are placed in the ball bearing groove.

6. The centralizer device with self-rotating cleaning and drag reduction combined functions according to claim 5, characterized in that, The upper bearing assembly includes: a shaft ring, a cage, rolling elements, a shaft seat, and a bearing seat; The bearing seat is installed at the bottom of the upper straightening vane assembly, and the center line of the bearing seat coincides with the axis of the upper straightening vane assembly and the fluid pipe. The bearing ring is installed at the top inner side of the bearing seat, and the inner surface of the bearing ring is tightly connected to the fluid pipe. The seat ring is installed at the bottom inner side of the bearing seat, and the outer circular surface of the seat ring is tightly fitted with the bottom end of the inner surface of the bearing seat. The retainer has a circular ring structure and is installed in the annular space between the bearing ring and the seat ring. The retainer has a plurality of ball grooves, and there are a plurality of rolling elements, which are equidistantly embedded in the plurality of ball grooves on the retainer along the circumference. The rolling elements are cylinders and their upper ends are in rolling contact with the lower surface of the bearing ring.

7. The centralizer device with self-rotating cleaning and drag reduction combined functions according to claim 6, characterized in that, The lower straightening vane assembly and the upper straightening vane assembly are symmetrically arranged relative to the swirl straightening device; the lower straightening vane assembly includes: a lower body, a lower straightening vane, a lower roller groove, a lower drag-reducing roller, and a lower ball bearing device; The inner surface of the lower body is fixedly connected to the fluid pipe; there are four lower straightening vanes, which are equidistantly distributed along the circumference on the outer surface of the lower body; there are four lower roller grooves, which are respectively opened within the four lower straightening vanes; the lower drag-reducing rollers comprise four sets, which are respectively installed in the lower roller grooves; each of the four lower straightening vanes has three linearly arranged cylindrical grooves on the upper and lower end walls of the lower roller grooves, and the lower ball bearing device is embedded in the grooves.

8. The centralizer device with self-rotating cleaning and drag reduction combined functions according to claim 7, characterized in that, The lower bearing assembly includes: a lower bearing ring, a lower cage, lower rolling elements, a lower bearing seat, and a lower bearing seat ring; The lower bearing seat is installed at the top of the lower straightening vane assembly, and the center line of the lower bearing seat coincides with the axis of the lower straightening vane assembly and the fluid pipe. The lower bearing ring is installed at the bottom inner side of the bearing seat, and the inner surface of the lower bearing ring is tightly connected to the fluid pipe. The lower seat ring is installed at the top inner side of the lower bearing seat, and the outer circular surface of the lower seat ring is tightly fitted with the top of the inner surface of the lower bearing seat. The lower retainer has a circular ring structure and is installed in the annular space between the lower bearing ring and the seat ring. The lower retainer has several ball grooves, and there are several lower rolling elements, which are equidistantly embedded in the ball grooves on the lower retainer along the circumference, wherein the lower rolling elements are cylinders and their bottom ends are in rolling contact with the upper surface of the lower bearing ring.

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