A dual drop prevention device for a turbo drill

Abstract

The utility model relates to a drilling tool technical field, concretely relates to a turbine drilling tool double anti -drop device, include: casing, the casing is suitable for accommodating the mandrel of turbine drilling tool, first anti -drop subassembly, first anti -drop subassembly includes first anti -drop casing and axle cap, and first anti -drop casing and axle cap mutually cooperate and abut, second anti -drop subassembly, second anti -drop subassembly sets up in the one end of casing along first direction, and second anti -drop subassembly includes second anti -drop shell, third anti -drop shell and axle sleeve, and second anti -drop shell and axle sleeve mutually cooperate and abut. Through setting up first anti -drop subassembly and second anti -drop subassembly respectively in the both ends of casing along first direction, utilize the cooperation abutment of first anti -drop casing and axle cap and limit the movement of mandrel to the end away from first anti -drop subassembly, and through the cooperation abutment of second anti -drop shell and axle sleeve and limit the movement of mandrel to the end close to second anti -drop subassembly simultaneously, promote turbine drilling tool whole anti -drop basis reliability.

Description

Technical Field

[0001] This utility model relates to the field of drilling tool technology, specifically to a dual anti-drop device for turbine drill bits. Background Technology

[0002] A turbine drill bit is a blade-type hydraulic downhole motor, belonging to fluid machinery. Its main components include an upper housing connector, housing, lower housing connector, input spindle, output mandrel, end face clamping cap, adjusting sleeve, radial centralizing bearing, turbine stator-rotor assembly, and axial thrust bearing. During downhole operation, the stator in the turbine stator-rotor assembly first converts the hydraulic pressure energy of the drilling fluid into hydraulic kinetic energy. The rotor then converts this kinetic energy into rotational mechanical energy of the output mandrel, thereby driving the drill bit to break the rock at the bottom of the well. During this energy conversion process, the drilling fluid pressure at the upper inlet of the turbine drill bit is much greater than the drilling fluid pressure at the lower outlet, resulting in a significant pressure difference between the upper and lower ends. This causes both the input spindle and the housing to be subjected to substantial axial hydraulic loads.

[0003] In related technologies, when the drill bit rotates at high speed to break rock under the drive of the output mandrel, the input spindle, output mandrel, and housing of the turbine drill string are also subjected to significant rotational torque and various vibration loads. Therefore, when the turbine drill string operates in the high-temperature and high-pressure environment downhole, over time, turbine drill string accidents may occasionally occur, resulting in significant economic losses to oil and gas exploration and development drilling. Utility Model Content

[0004] In view of this, the present invention provides a dual anti-fall device for turbine drill bits to solve the problem that turbine drill bits are prone to breakage and falling into the well in the prior art.

[0005] This utility model provides a dual anti-drop device for turbine drill bits, including: Housing, the housing is adapted to house the mandrel of the turbine drill bit; The first anti-drop component is disposed at one end of the housing along the first direction. The first anti-drop component includes a first anti-drop housing (i.e., the upper connector of the housing) and a shaft cap. The first anti-drop housing and the shaft cap cooperate to abut against each other, restricting the movement of the spindle away from the end of the first anti-drop component along the first direction. The second anti-drop component is disposed at the other end of the housing along the first direction. The second anti-drop component includes a second anti-drop outer shell and a bushing. The second anti-drop outer shell and the bushing cooperate to abut against each other, restricting the movement of the spindle along the first direction near the end of the second anti-drop component.

[0006] Beneficial effects: By setting a first anti-drop component and a second anti-drop component at both ends of the housing along the first direction, the first anti-drop housing and the shaft cap cooperate to abut and limit the mandrel's axial movement away from the first anti-drop component. At the same time, the second anti-drop housing and the shaft sleeve cooperate to abut and limit the mandrel's axial movement towards the second anti-drop component, forming a basic structure for double anti-drop. This can initially block the mandrel's path to the well from two key directions of the mandrel's axial movement, providing a core framework for anti-drop protection under subsequent multi-condition working conditions and improving the overall reliability of the turbine drill bit's anti-drop system.

[0007] In one optional embodiment, a first snap-fit ​​portion is provided on the outer side of the shaft cap, and a first anti-drop protrusion is provided on the inner wall of the first anti-drop housing, with the first snap-fit ​​portion abutting against the first anti-drop protrusion.

[0008] Beneficial effects: By setting a first snap-fit ​​part on the outside of the shaft cap and a first anti-falling protrusion on the inner wall of the first anti-falling housing, the two can cooperate to form a physical barrier when the shaft cap tends to fall due to downhole load, effectively avoiding the risk of the spindle falling into the well caused by the shaft cap moving away from the first anti-falling component. This further strengthens the anti-falling function of the first anti-falling component and makes the protection of a single anti-falling component more targeted.

[0009] In one optional embodiment, a third locking part is provided on the outer side of the bushing, the third locking part is provided on the outer side of the bushing along the first direction, and a second anti-drop protrusion is provided on the inner wall of the second anti-drop housing, the third locking part abuts against the second anti-drop protrusion.

[0010] Beneficial effect: The third snap-fit ​​part on the outer side of the bushing forms abutment with the second anti-fall protrusion on the inner wall of the second anti-fall housing. When the bushing is subjected to downhole vibration, pressure and other loads and falls, it can move towards the second anti-fall assembly through the abutment and blocking core of the third snap-fit ​​part and the second anti-fall protrusion.

[0011] In one alternative embodiment, a locking ring is provided at the end of the bushing away from the second anti-drop component along the first direction. The locking ring rotates relative to the spindle, causing the locking ring to tend to move closer to the bushing along the first direction, and the bushing abuts against the locking ring.

[0012] Beneficial effects: A locking ring is installed at the end of the bushing furthest from the second anti-drop component. The locking ring's rotation relative to the mandrel causes it to move closer to the bushing, ensuring a tight fit between the bushing and the locking ring, effectively limiting axial displacement of the bushing on the mandrel. Downhole turbine drill bits are subjected to rotational torque and vibration loads. This structure prevents the bushing from shifting axially due to these loads, ensuring the third locking part and the second anti-drop protrusion maintain a precise fit, preventing failure of the anti-drop structure due to bushing displacement, and guaranteeing the stability of the second anti-drop component's protective function.

[0013] In one alternative embodiment, the inner wall of the locking ring is provided with an internal thread, and the outer side of the mandrel is provided with an external thread that matches the internal thread of the locking ring. The locking ring fixes the bushing to the outside of the mandrel by engaging with the external thread of the mandrel through the internal thread.

[0014] Beneficial effects: The use of a locking ring with an internal thread and a mandrel with an external thread to fix the bushing not only ensures a secure connection between the bushing and the mandrel, but also, through the self-locking properties of the thread, resists the loosening effect of complex downhole loads on the bushing, preventing the bushing from detaching from the mandrel. At the same time, the threaded connection is a detachable structure, allowing the bushing to be removed by rotating the locking ring during turbine drill tool maintenance and repair, facilitating the inspection or replacement of components such as the bushing and mandrel, thus balancing the reliability of the connection with the convenience of maintenance.

[0015] In one optional embodiment, the shaft cap has at least one through hole, which is provided through the shaft cap along the axial direction and is evenly distributed along the circumference of the shaft cap.

[0016] Beneficial effects: The through holes on the shaft cap, running axially and evenly distributed circumferentially, provide a stable flow channel for drilling fluid. Turbine drills rely on drilling fluid for energy conversion during operation. These through holes prevent pressure buildup at the shaft cap due to obstructed fluid flow, preventing excessive pressure from causing additional axial or radial loads on components such as the shaft cap and mandrel. This protects the structural integrity of the anti-fall components and ensures the normal conversion of drilling fluid energy into the rotational mechanical energy of the mandrel, without affecting the drilling efficiency of the turbine drill.

[0017] In one optional embodiment, the first anti-drop protrusion is arranged circumferentially along the inner wall of the first anti-drop housing to form an annular retaining edge, and the first snap-fit ​​part is an annular protrusion integrally formed with a shaft cap.

[0018] Beneficial effects: The first anti-fall protrusion is a continuous annular retaining edge on the inner wall of the first anti-fall housing, and the first locking part is an annular protrusion integrally formed by the shaft cap. The two form a full-circumferential abutment structure. Compared with intermittently set protrusions, the continuous annular structure can avoid abutment failure due to local gaps, ensuring uniform force distribution throughout the circumference when the shaft cap falls; the integrally formed annular locking part does not require additional splicing, has higher structural strength, can withstand greater axial tension and vibration loads downhole, adapts to the harsh downhole environment of high temperature and high pressure, and extends the service life of the anti-fall structure.

[0019] In one alternative embodiment, the third snap-fit ​​portion is integrally formed with the bushing, and the second anti-drop protrusion is arranged circumferentially along the inner wall of the second anti-drop housing.

[0020] Beneficial effects: The third locking part is integrally formed with the bushing, which can enhance the overall structural strength of the bushing and enable the third locking part to withstand greater impact force when it abuts against the second anti-drop protrusion, making it less prone to breakage or deformation; the second anti-drop protrusion is set along the circumferential direction of the inner wall of the second anti-drop shell, which reduces the processing difficulty and cost of the shell.

[0021] In one alternative embodiment, the second anti-drop housing includes a housing body, one end of which is detachably connected to the corresponding end of the housing along the first direction via threads.

[0022] Beneficial effects: The outer shell of the second anti-drop shell is connected to the housing by a threaded detachable connection. During installation, its axial position on the housing can be adjusted by adjusting the outer shell body to ensure that the second anti-drop protrusion is precisely aligned with the third snap-fit ​​part on the bushing, thus ensuring the fitting accuracy of the anti-drop structure. When the second anti-drop shell is damaged due to downhole wear, collision, etc., it can be disassembled and replaced separately without replacing the entire turbine drill housing, which greatly reduces maintenance costs and improves the economy of the equipment.

[0023] In one optional embodiment, the second anti-drop component is provided with a third anti-drop housing (i.e., the lower connector of the housing), the third anti-drop housing is connected to the housing by threads, the outer diameter of the third anti-drop housing is adapted to the inner wall diameter of the second anti-drop housing, and the end of the third anti-drop housing near the bushing along the first direction abuts against the third snap-fit ​​portion.

[0024] Beneficial effects: When the end of the third anti-drop housing close to the bushing along the first direction abuts against the third locking part, the abutment between the third anti-drop housing and the third locking part prevents the third anti-drop housing from continuing to move, thus preventing the housing from falling into the well. This further expands the anti-drop working conditions and improves the safety and reliability of the turbine drilling tool working downhole. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the dual anti-drop device for the turbine drill bit of this utility model; Figure 2 for Figure 1 Enlarged view at point B in the middle; Figure 3 for Figure 2 Enlarged view at point C; Figure 4 for Figure 1A schematic diagram of AA in the diagram.

[0027] Explanation of reference numerals in the attached figures: 1. Housing; 2. Spindle; 3. First anti-drop component; 31. First anti-drop housing; 32. First anti-drop protrusion; 33. Shaft cap; 331. First snap-fit ​​part; 332. Through hole; 4. Second anti-drop component; 41. Second anti-drop outer shell; 411. Outer shell body; 412. Second anti-drop protrusion; 42. Third anti-drop outer shell; 43. Shaft sleeve; 431. Third snap-fit ​​part; 432. Shaft sleeve body; 5. Locking ring. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] A turbine drill bit, as a type of bladed hydraulic downhole motor, belongs to fluid machinery. Its main components include an upper housing connector, housing, lower housing connector, input spindle, output mandrel, end face clamping cap, adjusting sleeve, radial centering bearing, turbine stator-rotor assembly, and axial thrust bearing. During downhole operation, the stator in the turbine stator-rotor assembly first converts the pressure energy of the drilling fluid into kinetic energy. The rotor then converts this kinetic energy into rotational mechanical energy of the output mandrel, thereby driving the drill bit to break the rock at the bottom of the well. During this energy conversion process, the drill bit at the upper inlet of the turbine drill bit... The well fluid pressure is much greater than the lower outlet pressure, and there is a large pressure difference between the upper and lower ends of the drilling fluid. This causes the input spindle and the housing to be subjected to large axial hydraulic loads. At the same time, in related technologies, when the drill bit rotates at high speed to break rock under the drive of the output mandrel, the input spindle, output mandrel, and housing of the turbine drill bit are also subjected to large rotational torques and various vibration loads. Therefore, when the turbine drill bit is working in the high temperature and high pressure environment downhole, over time, turbine drill bit accidents may occasionally occur, causing significant economic losses to oil and gas exploration and development drilling.

[0033] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.

[0034] According to an embodiment of the present invention, a dual anti-drop device for a turbine drill bit is provided, comprising: a housing 1, the housing 1 being adapted to accommodate a mandrel 2 of the turbine drill bit; a first anti-drop component 3, the first anti-drop component 3 being disposed at one end of the housing 1 along a first direction, the first anti-drop component 3 including a first anti-drop housing 31 and a shaft cap 33, the first anti-drop housing 31 and the shaft cap 33 engaging with each other to restrict the mandrel 2 from moving away from the first anti-drop component 3 along the first direction; and a second anti-drop component 4, the second anti-drop component 4 being disposed at the other end of the housing 1 along the first direction, the second anti-drop component 4 including a second anti-drop outer shell 41, a third anti-drop outer shell 42 and a shaft sleeve 43, the second anti-drop outer shell 41 and the shaft sleeve 43 engaging with each other to restrict the mandrel 2 from moving closer to the second anti-drop component 4 along the first direction.

[0035] By setting a first anti-fall-off component 3 and a second anti-fall-off component 4 at both ends of the housing 1 along the first direction, the first anti-fall-off housing 31 and the shaft cap 33 cooperate to abut and restrict the mandrel 2 from moving away from the first anti-fall-off component 3. At the same time, the second anti-fall-off housing 41 and the shaft sleeve 43 cooperate to abut and restrict the mandrel 2 from moving towards the second anti-fall-off component 4, forming a basic structure for double anti-fall-off protection. This can initially block the path of the mandrel 2 falling into the well from the two key directions of the axial movement of the mandrel 2, providing a core framework for anti-fall-off protection under subsequent multi-condition conditions and improving the basic reliability of the turbine drill bit's overall anti-fall-off protection.

[0036] In some embodiments, combined with Figure 2As shown, a first locking part 331 is provided on the outer side of the shaft cap 33, and a first anti-falling protrusion 32 is provided on the inner wall of the first anti-falling housing 31. The first locking part 331 abuts against the first anti-falling protrusion 32. By providing the first locking part 331 on the outer side of the shaft cap 33 and the first anti-falling protrusion 32 on the inner wall of the first anti-falling housing 31, the abutting cooperation between the two can utilize the matching relationship of structural dimensions to quickly form a physical block when the shaft cap 33 tends to fall due to downhole load. This effectively avoids the risk of the spindle 2 falling into the well caused by the shaft cap 33 moving away from the first anti-falling component 3, further strengthening the anti-falling function of the first anti-falling component 3 and making the protection of a single anti-falling component more targeted.

[0037] Furthermore, the first anti-fall protrusion 32 is arranged circumferentially along the inner wall of the first anti-fall housing 31, forming an annular retaining edge, and the first engaging part 331 is an annular protrusion integrally formed from the shaft cap 33. The first anti-fall protrusion 32 is an annular retaining edge circumferentially along the inner wall of the first anti-fall housing 31, and the first engaging part 331 is an annular protrusion integrally formed from the shaft cap 33, forming a full-circumferential abutment structure. Compared with intermittently arranged protrusions, the continuous annular structure can avoid abutment failure due to local gaps, ensuring uniform force distribution throughout the circumference when the shaft cap 33 falls; the integrally formed annular engaging part does not require additional splicing, has higher structural strength, can withstand greater axial tension and vibration loads downhole, adapts to the harsh downhole environment of high temperature and high pressure, and extends the service life of the anti-fall structure.

[0038] Specifically, the first snap-fit ​​portion 331 can be configured as a structure that protrudes radially along the outer side of the shaft cap 33, and its cross-sectional shape can be rectangular, trapezoidal or semi-circular, etc.; the first anti-drop protrusion 32 is a structure that protrudes radially inward along the inner wall of the first anti-drop housing 31, and its cross-sectional shape is adapted to the first snap-fit ​​portion 331 to ensure the contact area and stability when the two are in contact.

[0039] In some embodiments, combined with Figure 3 As shown, a third locking part 431 is provided on the outer side of the bushing 43. The third locking part 431 is provided on the outer side of the bushing 43 along the first direction. A second anti-falling protrusion 412 is provided on the inner wall of the second anti-falling housing 41. The third locking part 431 abuts against the second anti-falling protrusion 412. The third locking parts 431 provided on both sides of the outer side of the bushing 43 along the first direction form abutting cooperation with the second anti-falling protrusion 412 on the inner wall of the second anti-falling housing 41. When the bushing 43 is subjected to downhole vibration, pressure or other loads and falls, it can move towards the second anti-falling assembly 4 by the abutting and blocking mandrel 2 of the third locking part 431 on one side against the second anti-falling protrusion 412.

[0040] Furthermore, the third locking part 431 is integrally formed with the bushing 43, and the second anti-drop protrusions 412 are circumferentially spaced along the inner wall of the second anti-drop housing 41, with each second anti-drop protrusion 412 having the same height along the first direction. The integral formation of the third locking part 431 with the bushing 43 enhances the overall structural strength of the bushing 43, enabling the third locking part 431 to withstand greater impact force when it abuts against the second anti-drop protrusions 412, making it less prone to breakage or deformation. The second anti-drop protrusions 412 are circumferentially spaced along the inner wall of the second anti-drop housing 41, ensuring effective abutment against the third locking part 431 while reducing the connection area between the protrusions and the inner wall of the housing, thus reducing the processing difficulty and cost of the housing. Moreover, the consistent height of each protrusion ensures that the bushing 43 is subjected to uniform force when it abuts, avoiding local stress concentration that could damage the second anti-drop housing 41.

[0041] In some embodiments, combined with Figure 3 As shown, a locking ring 5 is provided on the side of the bushing 43 away from the second anti-drop component 4 along the first direction. The locking ring 5 rotates relative to the spindle 2, causing the locking ring 5 to tend to move closer to the bushing 43 along the first direction, and the bushing 43 abuts against the locking ring 5. By providing the locking ring 5 on the side of the bushing 43 away from the second anti-drop component 4, and utilizing the tendency of the locking ring 5 to move closer to the bushing 43 due to its rotation relative to the spindle 2, the bushing 43 and the locking ring 5 are tightly abutted, which can effectively limit the axial displacement of the bushing 43 on the spindle 2. Downhole turbine drilling tools are subject to rotational torque, vibration loads, etc. This structure can prevent the bushing 43 from axially shifting due to these loads, ensuring that the third locking part 431 and the second anti-drop protrusion 412 always maintain a precise mating position, avoiding failure of the anti-drop structure due to displacement of the bushing 43, and ensuring the stability of the protective function of the second anti-drop component 4.

[0042] Furthermore, the inner wall of the locking ring 5 is provided with an internal thread, and the outer side of the mandrel 2 is provided with an external thread that matches the internal thread of the locking ring 5. The locking ring 5 fixes the bushing 43 to the outside of the mandrel 2 through the engagement of the internal thread and the external thread of the mandrel 2. The method of fixing the bushing 43 by the thread engagement of the internal thread of the locking ring 5 and the external thread of the mandrel 2 not only achieves a firm connection between the bushing 43 and the mandrel 2, but also, through the self-locking characteristics of the thread, resists the loosening effect of complex downhole loads on the bushing 43, preventing the bushing 43 from loosening from the mandrel 2. At the same time, the threaded connection is a detachable structure. During the maintenance and repair of the turbine drilling tool, the bushing 43 can be removed by rotating the locking ring 5, which facilitates the inspection or replacement of components such as the bushing 43 and the mandrel 2, thus taking into account both the reliability of the connection and the convenience of maintenance.

[0043] In some embodiments, combined with Figure 4As shown, the shaft cap 33 has at least one through hole 332, which extends through the shaft cap 33 axially and is evenly distributed circumferentially along the shaft cap 33. The through holes 332, extending axially and evenly distributed circumferentially, provide a stable flow channel for drilling fluid. When the turbine drill bit is working, it relies on drilling fluid for energy conversion. These through holes 332 prevent pressure buildup at the shaft cap 33 due to obstructed drilling fluid flow, preventing excessive pressure from causing additional axial or radial loads on components such as the shaft cap 33 and the mandrel 2. This protects the structural integrity of the anti-drop components and ensures the normal conversion of drilling fluid energy into the rotational mechanical energy of the mandrel 2, without affecting the drilling efficiency of the turbine drill bit.

[0044] It is worth noting that the second anti-drop housing 41 includes a housing body 411, one end of which is detachably connected to the corresponding end of the housing 1 along the first direction via threads. The housing body 411 of the second anti-drop housing 41 is detachably connected to the housing 1 via threads. During installation, the axial position of the housing body 411 on the housing 1 can be adjusted by rotating it to ensure precise alignment between the second anti-drop protrusion 412 and the third snap-fit ​​portion 431 on the bushing 43, thus ensuring the fitting accuracy of the anti-drop structure. When the second anti-drop housing 41 is damaged due to downhole wear, collision, etc., the housing body 411 can be disassembled and replaced separately, without replacing the entire turbine drill housing 1, significantly reducing maintenance costs and improving the economic efficiency of the equipment.

[0045] In some embodiments, combined with Figure 3 As shown, the second anti-fall component 4 is provided with a third anti-fall housing 42 (i.e., the lower connector of the housing). The third anti-fall housing 42 is threadedly connected to the housing 1. The outer diameter of the third anti-fall housing 42 is adapted to the inner wall diameter of the second anti-fall housing 41. The end of the third anti-fall housing 42 near the bushing 43 along the first direction abuts against the third locking part 431. When the end of the third anti-fall housing 42 near the bushing 43 along the first direction abuts against the third locking part 431, the abutment between the third anti-fall housing 42 and the third locking part 431 prevents the third anti-fall housing 42 from continuing to move, thus preventing the housing 1 from falling into the well. This further expands the anti-fall working condition and improves the safety and reliability of the turbine drilling tool working downhole.

[0046] This invention uses a housing 1 that houses the turbine drill mandrel 2 as the basic carrier. A dual protection system is constructed by deploying a first anti-drop component 3 and a second anti-drop component 4 at both ends of the housing 1 along the axial direction of the mandrel 2. In the first anti-drop component 3, a first anti-drop protrusion 32 fixed to the inner wall of the first anti-drop housing 31 at one end of the housing 1 abuts against a first locking part 331 sleeved and fixed to the outer side of the bushing 33 at the end of the mandrel 2. When the mandrel 2 tends to move away from the first anti-drop component 3 due to downhole axial tension, vibration, or other loads, this abutting structure forms a physical barrier, directly restricting the mandrel 2's movement in this direction. In the second anti-drop component 4, a second anti-drop protrusion 412 fixed to the inner wall of the second anti-drop housing 41 at the other end of the housing 1 abuts against third locking parts on both sides of the bushing 43 sleeved and relatively fixed to the outer side of the mandrel 2. The parts 431 abut against each other, which can prevent the mandrel 2 from moving towards the second anti-drop component 4. At the same time, the locking ring 5 of the bushing 43 on the side away from the second anti-drop component 4 along the first direction is threadedly connected to the outer thread of the mandrel 2 through the inner thread of the inner wall. The self-locking characteristic of the thread fixes the axial position of the bushing 43 on the mandrel 2, and prevents the bushing 43 from shifting due to downhole rotation torque and vibration load, which would cause the third locking part 431 to fail to cooperate with the second anti-drop protrusion 412. In addition, the through holes 332 on the shaft cap 33, which are axially penetrating and circumferentially evenly distributed, can provide a stable flow channel for drilling fluid. Furthermore, when the end of the third anti-drop outer shell 42 near the bushing 43 along the first direction abuts against the third locking part 431, it can further ensure the safety and reliability of the turbine drill in harsh environments such as deep wells and complex well conditions.

[0047] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A dual drop prevention device for a turbo-drill, comprising: include: Housing (1), said housing (1) being adapted to house the mandrel (2) of the turbine drill bit; The first anti-drop component (3) is disposed at one end of the housing (1) along the first direction. The first anti-drop component (3) includes a first anti-drop housing (31) and a shaft cap (33). The first anti-drop housing (31) and the shaft cap (33) cooperate to abut against each other, restricting the movement of the spindle (2) away from the first anti-drop component (3) along the first direction. The second anti-drop component (4) is disposed at the other end of the housing (1) along the first direction. The second anti-drop component (4) includes a second anti-drop outer shell (41) and a bushing (43). The second anti-drop outer shell (41) and the bushing (43) cooperate to abut against each other, restricting the movement of the spindle (2) along the first direction near the end of the second anti-drop component (4).

2. The double slip device for a turbodrill of claim 1, wherein, The outer side of the shaft cap (33) is provided with a first snap-fit ​​part (331), and the inner wall of the first anti-drop housing (31) is provided with a first anti-drop protrusion (32), and the first snap-fit ​​part (331) abuts against the first anti-drop protrusion (32).

3. The double slip device for a turbodrill of claim 1 wherein, The bushing (43) is provided with a third snap-fit ​​part (431) on the outside. The third snap-fit ​​part (431) is provided on the outside of the bushing (43) along the first direction. The inner wall of the second anti-drop shell (41) is provided with a second anti-drop protrusion (412). The third snap-fit ​​part (431) abuts against the second anti-drop protrusion (412).

4. The double slip device for a turbodrill of claim 3 wherein, The bushing (43) has a locking ring (5) at one end away from the second anti-drop component (4) along the first direction. The locking ring (5) rotates relative to the spindle (2), causing the locking ring (5) to tend to approach the bushing (43) along the first direction. The bushing (43) abuts against the locking ring (5).

5. The double slip device for a turbodrill of claim 4 wherein, The inner wall of the locking ring (5) is provided with an internal thread, and the outer side of the mandrel (2) is provided with an external thread that matches the internal thread of the locking ring (5). The locking ring (5) fixes the bushing (43) to the outer side of the mandrel (2) through the internal thread and the external thread of the mandrel (2).

6. The double slip device for a turbodrill of claim 2 wherein, At least one through hole (332) is provided on the shaft cap (33), the through hole (332) is provided through the shaft cap (33) along the axial direction, and the through hole (332) is evenly distributed along the circumference of the shaft cap (33).

7. The double slip device for a turbodrill of claim 6 wherein, The first anti-drop protrusion (32) is arranged circumferentially along the inner wall of the first anti-drop housing (31) to form an annular stop, and the first snap-fit ​​part (331) is an annular protrusion integrally formed by the shaft cap (33).

8. The double slip device for a turbodrill of claim 3 wherein, The third snap-fit ​​part (431) is integrally formed with the bushing (43), and the second anti-drop protrusion (412) is arranged circumferentially along the inner wall of the second anti-drop shell (41).

9. The double slip device for a turbodrill of claim 8 wherein, The second anti-drop shell (41) includes a shell body (411), one end of which is detachably connected to the corresponding end of the shell (1) along the first direction by a thread.

10. The double slip device for a turbodrill of claim 3 wherein, The second anti-drop component (4) is provided with a third anti-drop housing (42), the outer diameter of the third anti-drop housing (42) is adapted to the inner wall diameter of the second anti-drop housing (41), and the end of the third anti-drop housing (42) close to the bushing (43) along the first direction abuts against the third snap-fit ​​part (431).

Images