Hydraulically driven enhanced rotary jetting mechanism and drill bit assembly

Abstract

The application relates to a liquid-driven enhanced rotary jet mechanism and a drill bit assembly, the liquid-driven enhanced rotary jet mechanism comprising an outer cylinder, a pad sleeve, a spiral rod, a center cylinder, a leakage cylinder and a guide nozzle, the pad sleeve being in a cylindrical structure and fixed on the inner side wall of the outer cylinder, the pad sleeve being internally provided with the spiral rod capable of rotating relative to the pad sleeve, the outer side wall of the spiral rod being provided with a spiral flow channel penetrating through the axial two ends of the spiral rod; the inner side wall of the outer cylinder is further provided with a bearing, the bearing being located below the pad sleeve and the spiral rod, the inner ring of the bearing being fixed with the center cylinder, the upper end of the center cylinder being fixedly connected with the lower end of the spiral rod, and the center flow channel being communicated with the lower end of the spiral flow channel on the outer side wall of the spiral rod; the lower end of the center flow channel is further provided with the leakage cylinder, and the guide nozzle is mounted on the leakage cylinder. The application can form an enhanced rotary jet, has the advantages of the rotary jet "water mill" effect of stretching-shearing rock breaking, can increase the fluid velocity of the drill bit surface, and can improve the drilling speed and protect the drill bit.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling and production technology, specifically to a hydraulically driven enhanced rotary jet mechanism and a drill bit assembly. Background Technology

[0002] my country possesses abundant deep oil and gas resources, with over 40% of the country's remaining oil and gas resources located in deep formations. Of the 11 large oil and gas fields discovered in my country in the past five years, eight are in deep formations. Domestic deep oil and gas resources are mainly marine and volcanic, concentrated primarily in the Tarim Kuqa foreland, northeastern Sichuan, and Songliao deep formations. To meet the ever-growing energy demand, the exploration and development of deep oil and gas resources is accelerating, with the number of deep and ultra-deep wells increasing annually. However, deep drilling generally suffers from slow drilling speeds and high costs. The limited efficiency of the drill bit at the bottom of the well is a major bottleneck contributing to this difficulty, making improving the drill bit's efficiency at the bottom of the well a key research focus for researchers. Summary of the Invention

[0003] In order to solve one or more technical problems existing in the prior art, the present invention provides a hydraulically driven enhanced rotary jet mechanism and a drill bit assembly.

[0004] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A hydraulically driven enhanced rotary injection mechanism includes an outer cylinder, a sleeve, a helical rod, a central cylinder, a drain cylinder, and a guide nozzle. The sleeve is a cylindrical structure and is fixed on the inner wall of the outer cylinder. The sleeve contains a helical rod that can rotate relative to itself. The outer wall of the helical rod has a helical flow channel that passes through both ends of its axial direction. The inner wall of the outer cylinder also has a bearing located below the sleeve and the helical rod. The inner ring of the bearing is fixed with a central cylinder. The upper end of the central cylinder is fixedly connected to the lower end of the helical rod. The middle flow channel of the central cylinder is connected to the lower end of the helical flow channel on the outer wall of the helical rod. The lower end of the central cylinder also has a drain cylinder, on which a guide nozzle is installed.

[0005] The beneficial effects of this invention are as follows: The hydraulically driven enhanced rotary jet mechanism of this invention utilizes the cooperation between the gasket and the auger rod. Under the action of fluid, the auger rod rotates, driving the central cylinder and the drain cylinder to rotate, which in turn drives the central rod to rotate, ultimately driving the guide nozzle to rotate and ejecting a rotary jet. Combined with the rotation of the guide nozzle's own flow channel, an enhanced rotary jet is formed. This not only has the advantages of the rotary jet's "water milling" effect in stretching and shearing rock breaking, but also increases the fluid velocity on the drill bit surface, reduces drill bit thermal wear, and increases the propagation of rock fractures, thereby achieving the purpose of improving drilling speed and protecting the drill bit.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the outer diameter of the central cylinder is smaller than the outer diameter of the helical rod.

[0008] The advantages of adopting the above-mentioned further solution are: making the outer diameter of the central cylinder smaller than the outer diameter of the screw rod, facilitating the coaxial fixed connection between the central cylinder and the screw rod, and also facilitating the setting of the sealing structure, making it easier to seal the connection between the screw rod and the bearing.

[0009] Furthermore, an upper annular sealing seat and a lower annular sealing seat are provided on the inner wall of the outer cylinder, the bearing is installed between the upper annular sealing seat and the lower annular sealing seat, and the gasket and the spiral rod are respectively located above the upper annular sealing seat.

[0010] The beneficial effects of adopting the above-mentioned further solution are: by setting the upper annular sealing seat and the lower annular sealing seat, it is convenient to assemble the bearing on the inner wall of the outer cylinder, and it is also convenient to set the sealing structure between the bearing and the screw rod and the central cylinder.

[0011] Furthermore, a first sealing ring is fitted between the inner ring edge of the upper annular sealing seat and the central cylinder, and a second sealing ring is fitted between the inner ring edge of the lower annular sealing seat and the central cylinder.

[0012] The beneficial effect of adopting the above-mentioned further solution is that by setting the first sealing ring and the second sealing ring, a sealed connection can be achieved between the screw rod and the bearing, resulting in a better sealing effect.

[0013] Furthermore, an upper copper pad is provided between the upper annular sealing seat and the upper end of the bearing, and a lower copper pad is provided between the lower annular sealing seat and the lower end of the bearing.

[0014] The beneficial effects of adopting the above-mentioned further solution are: the copper gasket can withstand a certain deformation, which facilitates the entry of drilling fluid into the bearing, and has both structural support and sealing effects.

[0015] Furthermore, both the upper and lower copper pads are annular and are respectively fitted onto the upper and lower ends of the central cylinder. The inner ring edge of the upper copper pad extends beyond the inner ring edge of the upper annular sealing seat and is in sealing contact with the central cylinder. The inner ring edge of the lower copper pad extends beyond the inner ring edge of the lower annular sealing seat and is in sealing contact with the central cylinder.

[0016] The advantage of adopting the above-mentioned further solution is that it facilitates the installation of a sealing ring between the annular sealing seat and the central cylinder.

[0017] Furthermore, an upper PTFE gasket is provided between the upper annular sealing seat and the lower end of the gasket and the lower end of the spiral rod, and a lower PTFE gasket is provided at the bottom of the lower annular sealing seat.

[0018] The beneficial effect of adopting the above-mentioned further solution is that it is used to seal angular contact bearings, prevent drilling fluid from entering the bearings, and serve as the first seal.

[0019] Furthermore, both the upper and lower PTFE gaskets are annular and are respectively fitted onto the upper and lower ends of the central cylinder. The inner ring edge of the upper PTFE gasket extends beyond the inner ring edge of the upper annular sealing seat and is in sealing contact with the central cylinder. The inner ring edge of the lower PTFE gasket extends beyond the inner ring edge of the lower annular sealing seat and is in sealing contact with the central cylinder.

[0020] The advantage of adopting the above-mentioned further solution is that it facilitates the installation of a sealing ring between the annular sealing seat and the central cylinder.

[0021] Furthermore, the outer wall of the venting cylinder is provided with a downwardly inclined venting hole; the upper end of the guide nozzle is fixed to the lower end of the venting cylinder by a pin; part of the guide nozzle is located inside the outer cylinder, and the other part is located outside the outer cylinder.

[0022] The beneficial effect of adopting the above-mentioned further scheme is that the drilling fluid can enter the drain cylinder through the central cylinder and be ejected through the drain hole. Then, in conjunction with the guide nozzle, a rotating jet can be ejected.

[0023] A drill bit assembly includes the aforementioned hydraulically driven enhanced rotary jetting mechanism and a drill bit. An annular assembly step is provided on the upper outer side wall of the outer cylinder. The upper end of the outer cylinder is fitted inside the drill bit and the drill bit is limited on the annular assembly step.

[0024] The beneficial effects of the present invention are as follows: The drill bit assembly of the present invention, in conjunction with the above-mentioned hydraulically driven enhanced rotary jet mechanism, can generate a rotating jet, which helps to expand the micro-cracks in the rock and assists the cutting teeth in breaking the rock; it increases the jet action area, increases the fluid velocity on the drill tooth surface, reduces the thermal wear of the drill bit, thereby improving the drilling speed and protecting the drill bit, and making the entire drill bit assembly last longer. Attached Figure Description

[0025] Figure 1 This is a cross-sectional structural schematic diagram of the hydraulically driven enhanced rotary injection mechanism of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the screw rod of the present invention.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Outer cylinder; 2. Gasket; 3. Spiral rod; 31. Spiral flow channel; 4. Upper PTFE gasket; 41. Lower PTFE gasket; 5. First sealing ring; 51. Second sealing ring; 6. Upper annular sealing seat; 61. Lower annular sealing seat; 7. Upper copper gasket; 71. Lower copper gasket; 8. Bearing; 9. Center cylinder; 10. Drain cylinder; 11. Drain hole; 12. Hexagonal nut; 13. Pin; 14. Center rod; 15. Guide nozzle; 16. Guide flow channel. Detailed Implementation

[0029] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0030] like Figure 1 and Figure 2 As shown, a hydraulically driven enhanced rotary injection mechanism of this embodiment includes an outer cylinder 1, a sleeve 2, a helical rod 3, a central cylinder 9, a drain cylinder 10, and a guide nozzle 15. The sleeve 2 is a cylindrical structure and is fixed to the inner wall of the outer cylinder 1. The sleeve 2 contains a helical rod 3 that can rotate relative to itself. The outer wall of the helical rod 3 has a helical flow channel 31 that passes through both ends of its axial direction. The inner wall of the outer cylinder 1 also has a bearing 8, which is located below the sleeve 2 and the helical rod 3. The inner ring of the bearing 8 is fixed to the central cylinder 9. The upper end of the central cylinder 9 is fixedly connected to the lower end of the helical rod 3. The middle flow channel of the central cylinder 9 is connected to the lower end of the helical flow channel 31 on the outer wall of the helical rod 3. The lower end of the central cylinder 9 also has a drain cylinder 10, on which the guide nozzle 15 is installed. During the drilling process of the hydraulically driven enhanced rotary jet mechanism, under the action of the fluid, the fluid passes through the spiral flow channel 31 on the outer wall of the spiral rod 3, and the spiral flow channel 31 drives the spiral rod 3 to rotate, which in turn drives the central cylinder 9 fixedly connected to it to rotate. The fluid passes through the spiral flow channel 31 and enters the central cylinder 9. The fluid continues to rotate in the central cylinder 9 and enters the drain cylinder 10. Through the drain cylinder 10, it enters the guide nozzle 15. The fluid undergoes a rotating jet through the spiral flow channel 31, and then the rotating jet is enhanced by the guide nozzle 15. This effectively increases the effective area of ​​the drill bit nozzle jet, improves the flow field structure at the bottom of the well, prevents the drill bit from being covered with mud, and helps to improve the rock breaking efficiency of the drill bit, thereby improving the efficiency of the drill bit at the bottom of the well.

[0031] One specific solution in this embodiment is as follows: Figure 1 As shown, the flow guide nozzle 15 also has a spiral structure, meaning that the flow guide nozzle 15 can be a commercially available product. For example... Figure 1As shown in the figure, this embodiment provides a structure for a flow guide nozzle 15, which can be composed of two helical flow guide blades arranged symmetrically in opposite directions, each of which is provided with a flow guide channel 16. The flow guide nozzle 15 is used to further enhance the rotational effect of the fluid flowing through the helical flow channel 31. Compared with conventional drill bit nozzles, the generated enhanced rotating jet has both the advantages of the rotating jet's "water milling" effect in stretching and shearing rock breaking; it can also increase the fluid velocity on the drill bit surface, reduce drill bit thermal wear, and achieve the purpose of improving drilling speed and protecting the drill bit.

[0032] In this embodiment, multiple independent spiral channels 31 can be provided on the outer wall of the spiral rod 3, and the lower end of each spiral channel 31 is connected to the middle channel of the central cylinder 9.

[0033] In a preferred embodiment, the bearing 8 in this embodiment can be an angular contact bearing to support the center cylinder 9 and allow the center cylinder 9 to rotate freely. Since some rock cuttings may come into contact with the nozzle during the drilling process, axial force and lateral force will be generated. Moreover, if the rotation of the center cylinder 9 is not centered, lateral force will also be generated. By setting an angular contact bearing to support the rotation of the center cylinder 9, it can withstand axial and lateral forces.

[0034] like Figure 1 As shown, in a preferred embodiment, the outer diameter of the central cylinder 9 is smaller than the outer diameter of the spiral rod 3. Making the outer diameter of the central cylinder 9 smaller than the outer diameter of the spiral rod 3 facilitates the coaxial fixed connection between the central cylinder 9 and the spiral rod 3, and also facilitates the setting of the sealing structure, making it easier to achieve a sealed connection between the spiral rod and the bearing.

[0035] like Figure 1 As shown, in a preferred embodiment, the inner wall of the outer cylinder 1 is provided with an upper annular sealing seat 6 and a lower annular sealing seat 61. The bearing 8 is installed between the upper annular sealing seat 6 and the lower annular sealing seat 61. The gasket 2 and the spiral rod 3 are respectively located above the upper annular sealing seat 6. By providing the upper annular sealing seat and the lower annular sealing seat, it is convenient to assemble the bearing on the inner wall of the outer cylinder, and it is also convenient to set the sealing structure between the bearing, the spiral rod, and the central cylinder.

[0036] like Figure 1 As shown, in a further embodiment, a first sealing ring 5 is fitted between the inner ring edge of the upper annular sealing seat 6 and the central cylinder 9, and a second sealing ring 51 is fitted between the inner ring edge of the lower annular sealing seat 61 and the central cylinder 9. By setting the first and second sealing rings, a sealed connection can be achieved between the screw rod and the bearing, resulting in a better sealing effect.

[0037] like Figure 1As shown, to enhance the sealing effect, a further embodiment of this solution includes an upper copper gasket 7 between the upper annular sealing seat 6 and the upper end of the bearing 8, and a lower copper gasket 71 between the lower annular sealing seat 61 and the lower end of the bearing 8. The copper gasket can withstand a certain deformation, facilitating the entry of drilling fluid into the bearing, thus providing both structural support and sealing.

[0038] Specifically, both the upper copper pad 7 and the lower copper pad 71 are annular and are respectively fitted onto the upper and lower ends of the central cylinder 9. The inner ring edge of the upper copper pad 7 extends beyond the inner ring edge of the upper annular sealing seat 6 and is in sealing contact with the central cylinder 9. The inner ring edge of the lower copper pad 71 extends beyond the inner ring edge of the lower annular sealing seat 61 and is in sealing contact with the central cylinder 9. This facilitates the installation of a sealing ring between the annular sealing seat and the central cylinder.

[0039] like Figure 1 As shown, in a preferred embodiment, an upper PTFE gasket 4 is provided between the upper annular sealing seat 6 and the lower end of the gasket 2 and the lower end of the spiral rod 3, and a lower PTFE gasket 41 is provided at the bottom of the lower annular sealing seat 61. This is used to seal the angular contact bearing, prevent drilling fluid from entering the bearing, and serve as the first seal.

[0040] Specifically, such as Figure 1 As shown, the upper PTFE gasket 4 and the lower PTFE gasket 41 are both annular and are respectively fitted onto the upper and lower ends of the central cylinder 9. The inner ring edge of the upper PTFE gasket 4 extends beyond the inner ring edge of the upper annular sealing seat 6 and is in sealing contact with the central cylinder 9. The inner ring edge of the lower PTFE gasket 41 extends beyond the inner ring edge of the lower annular sealing seat 61 and is in sealing contact with the central cylinder 9. This facilitates the installation of a sealing ring between the annular sealing seat and the central cylinder.

[0041] In this embodiment, the outer cylinder 1 serves as the outer cylinder of the injection mechanism and can be connected to the matching drill bit. The gasket 2 has a certain degree of flexibility and is waterproof; it is generally made of elastic steel, i.e., a rigid material with high flexibility and elasticity. The gasket 2 can cooperate with the auger 3, allowing the fluid to drive the auger to rotate. In this embodiment, the upper PTFE gasket 4 and the lower PTFE gasket 41 are used to seal the angular contact bearing, preventing drilling fluid from entering the bearing, serving as the first seal. The upper annular sealing seat 6 and the lower annular sealing seat 61 are used to cooperate with the PTFE gasket and the copper gasket, respectively, to form a space for accommodating the sealing ring, and also to support the PTFE gasket and the copper gasket. The sealing ring is fitted onto the central cylinder 9 and abuts against the inner ring edge of the annular sealing seat, sealing the bearing and preventing drilling fluid from entering the bearing, serving as the second seal. The copper gasket can withstand a certain deformation, preventing drilling fluid from entering the bearing, serving as the third seal. This three-seal structure provides structural support and effectively prevents drilling fluid from entering the bearing. The central cylinder 9 can be used to transmit the rotation of the screw rod 3 and transport fluid, while the drain cylinder 10 can discharge the fluid flowing into the central cylinder 9 to the outside of the drain cylinder 10 through the drain hole 11.

[0042] like Figure 1 As shown, specifically, the outer wall of the drain cylinder 10 is provided with downwardly inclined drain holes 11. The drain holes 11 can be arranged in one or multiple rings, allowing fluid to be sprayed downwards at an angle through the drain holes 11. The upper end of the guide nozzle 15 is fixed to the lower end of the drain cylinder 10 by a pin 13. Part of the guide nozzle 15 is located inside the outer cylinder 1, and the other part is located outside the outer cylinder 1. Drilling fluid can enter the drain cylinder through the central cylinder and be ejected through the drain holes. Combined with the guide nozzle, it can spray out a rotating jet.

[0043] Specifically, such as Figure 1 As shown, a central rod 14 penetrating the bottom of the drain cylinder 10 can be fixed at its center. The upper end of the central rod 14 can be fixed inside the drain cylinder 10 by a hexagonal nut 12, which is also located inside the drain cylinder 10. The lower end of the central rod 14 is fixedly connected to the guide nozzle. A pin 13 can be provided on the hexagonal nut 12 to fix the hexagonal nut 12 to the drain cylinder 10 and prevent the hexagonal nut 12 from loosening.

[0044] The hydraulically driven enhanced rotary jet mechanism of this embodiment utilizes the cooperation between the gasket and the auger. Under the action of fluid, the auger rotates, driving the central cylinder and the drain cylinder to rotate, which in turn drives the central rod to rotate, ultimately driving the guide nozzle to rotate and ejecting a rotating jet. Combined with the rotation of the guide nozzle's own flow channel, an enhanced rotating jet is formed. This jet not only has the advantages of the rotating jet's "water milling" effect in stretching and shearing rock breaking, but also increases the fluid velocity on the drill bit surface, reduces drill bit thermal wear, and increases the propagation of rock fractures, thereby achieving the purpose of improving drilling speed and protecting the drill bit.

[0045] This embodiment also provides a drill bit assembly, including the above-mentioned hydraulically driven enhanced rotary jet mechanism, and a drill bit. An annular assembly step is provided on the upper outer side wall of the outer cylinder 1, and the upper end of the outer cylinder 1 is sleeved inside the drill bit and the drill bit is limited on the annular assembly step.

[0046] The drill bit assembly of this embodiment, in conjunction with the aforementioned hydraulically driven enhanced rotary jet mechanism, can generate a rotating jet, which helps to expand micro-cracks in the rock and assists the cutting teeth in breaking the rock; it increases the jet's effective area, increases the fluid velocity on the drill tooth surface, reduces thermal wear of the drill bit, thereby improving drilling speed and protecting the drill bit, and extending the lifespan of the entire drill bit assembly.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulically driven enhanced rotary injection mechanism, characterized in that, The device includes an outer cylinder, a sleeve, a helical rod, a central cylinder, a drain cylinder, and a flow guide nozzle. The sleeve is a cylindrical structure and is fixed to the inner wall of the outer cylinder. The sleeve contains a helical rod that can rotate relative to itself. The outer wall of the helical rod has a helical flow channel penetrating both ends of its axial direction. A bearing is also provided on the inner wall of the outer cylinder, located below the sleeve and the helical rod. The inner ring of the bearing is fixed to the central cylinder, whose upper end is fixedly connected to the lower end of the helical rod. The flow channel in the middle of the central cylinder communicates with the lower end of the helical flow channel on the outer wall of the helical rod. A drain cylinder is also provided at the lower end of the central cylinder, and a flow guide nozzle is installed on the drain cylinder. The outer diameter of the central cylinder is smaller than the outer diameter of the spiral rod; the outer wall of the venting cylinder is provided with a downwardly inclined venting hole; the upper end of the guide nozzle is fixed to the lower end of the venting cylinder by a pin; part of the guide nozzle is located inside the outer cylinder, and the other part is located outside the outer cylinder. A central rod is fixed through the bottom center of the bleed cylinder, and the central rod is fixed inside the bleed cylinder by a hexagonal nut; By utilizing the combination of the gasket and the screw rod, under the action of the fluid, the screw rod rotates, which drives the central cylinder and the discharge cylinder to rotate, and then drives the central rod to rotate, ultimately driving the guide nozzle to rotate and ejecting a rotating jet. Combined with the rotation of the guide nozzle's own flow channel, an enhanced rotating jet is formed.

2. The hydraulically driven enhanced rotary injection mechanism according to claim 1, characterized in that, The inner wall of the outer cylinder is provided with an upper annular sealing seat and a lower annular sealing seat. The bearing is installed between the upper annular sealing seat and the lower annular sealing seat. The gasket and the spiral rod are respectively located above the upper annular sealing seat.

3. The hydraulically driven enhanced rotary injection mechanism according to claim 2, characterized in that, A first sealing ring is fitted between the inner ring edge of the upper annular sealing seat and the central cylinder, and a second sealing ring is fitted between the inner ring edge of the lower annular sealing seat and the central cylinder.

4. The hydraulically driven enhanced rotary injection mechanism according to claim 2, characterized in that, An upper copper pad is provided between the upper annular sealing seat and the upper end of the bearing, and a lower copper pad is provided between the lower annular sealing seat and the lower end of the bearing.

5. The hydraulically driven enhanced rotary injection mechanism according to claim 4, characterized in that, The upper and lower copper pads are both annular and are respectively fitted onto the upper and lower ends of the central cylinder. The inner ring edge of the upper copper pad extends beyond the inner ring edge of the upper annular sealing seat and is in sealing contact with the central cylinder. The inner ring edge of the lower copper pad extends beyond the inner ring edge of the lower annular sealing seat and is in sealing contact with the central cylinder.

6. A hydraulically driven enhanced rotary injection mechanism according to any one of claims 2 to 5, characterized in that, An upper PTFE gasket is provided between the upper annular sealing seat and the lower end of the gasket and the lower end of the spiral rod, and a lower PTFE gasket is provided at the bottom of the lower annular sealing seat.

7. The hydraulically driven enhanced rotary injection mechanism according to claim 6, characterized in that, The upper and lower PTFE gaskets are both annular and are respectively fitted onto the upper and lower ends of the central cylinder. The inner ring edge of the upper PTFE gasket extends beyond the inner ring edge of the upper annular sealing seat and is in sealing contact with the central cylinder. The inner ring edge of the lower PTFE gasket extends beyond the inner ring edge of the lower annular sealing seat and is in sealing contact with the central cylinder.

8. A drill bit assembly, characterized in that, The hydraulically driven enhanced rotary jetting mechanism according to any one of claims 1 to 7 further includes a drill bit, wherein an annular assembly step is provided on the upper outer side wall of the outer cylinder, and the upper end of the outer cylinder is sleeved inside the drill bit and the drill bit is limited on the annular assembly step.

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