Balancer assembly for rotary drilling rig and drilling rod system

Abstract

The invention relates to the technical field of rotary drilling equipment, solves the problem of instability in the drilling process in the prior art, and discloses a balancer assembly for a rotary drilling and a drilling rod system. The balancer comprises an outer abutting body and an inner connecting ring. The inner connecting ring is connected with a corresponding section of a drill rod of the rotary drilling rig, and the diameter of the outermost ring of the outer abutting body is equal to the maximum diameter of a drill bit of the rotary drilling rig. In the drilling process, the balancer can effectively balance lateral force borne by the drill rod and the drill bit, vibration and deflection caused by eccentricity are reduced, and the drilling precision and efficiency are improved.

Description

Technical Field

[0001] The present application relates to the technical field of rotary drilling equipment, and in particular to a balancer assembly and a drill rod system for a rotary drilling device. Background Art

[0002] The drill rod of a rotary drilling rig is the core component of the rotary drilling rig for drilling operations.

[0003] The rotary drilling rod in the prior art mainly consists of the following parts: Steel pipe: As the main part of the drill rod, its length and diameter are designed according to the drilling depth and geological conditions. The steel pipes are connected section by section to form an integral drill rod. Internal and external drive keys: Welded on the steel pipe, used to transmit torque and axial pressure. The external drive key may be a three-key or six-key type, and the machine-locked drill rod also includes a pressurized lock table for bearing and transmitting pressurization. Connecting parts: such as flat heads, bolts, baffles, etc., used to connect the sections of the drill rod and fix other parts to ensure the integrity and stability of the drill rod. Shock-absorbing parts: such as vibration-absorbing rubber, springs, etc., used to reduce the impact force on the main machine during drilling and protect the main machine and drill rod. Other auxiliary parts: such as water trays, water trays, spring limit blocks, etc. The engine system provides power and transmits it to the power head through the hydraulic system. The power head drives the drill rod to rotate, and then drives the drill bit to rotate. The rotating drill bit cuts the soil layer to achieve drilling operations. At the same time, the drill rod will move forward while rotating, so that the drill bit continues to penetrate the soil layer. This propulsion force may be provided by the drilling rig's pressurization system or by the weight of the drill pipe itself. The inner and outer drive keys transmit torque and pressure to the drill bit, enabling the drill bit to overcome the resistance of the soil layer and cut.

[0004] Regarding the above-mentioned related technologies, under complex geological conditions, the stability of the existing technologies is not high, and it is easy to deviate from the preset path or the straightness is unstable during the drilling process. Especially when the preset path is not vertical, the straightness of the drilling is even more unstable under the influence of gravity or drill bit shaking. Summary of the invention

[0005] In order to improve the instability defect of the prior art during the drilling process, the present application provides a balancer assembly and a drill rod system for a rotary drill.

[0006] The following technical solutions are adopted: First, The present application provides a balancer assembly for a rotary drill, comprising a plurality of balancers arranged at intervals; the balancer comprises an outer abutment body and an inner connecting ring; the inner connecting ring is connected to a corresponding section of a drill rod of the rotary drill, and the outermost circle diameter of the outer abutment body is equal to the maximum diameter of the drill bit of the rotary drill.

[0007] By adopting the above technical solution, during the drilling process, the balancer can effectively balance the lateral force exerted on the drill rod and the drill bit, reduce the vibration and deflection caused by eccentricity, and improve the drilling accuracy and efficiency.

[0008] Optionally, the outer abutment body and the inner connecting ring are connected via a plurality of reinforcing ribs.

[0009] By adopting the above technical solution, it is possible to withstand greater lateral forces and maintain structural stability and reliability under complex geological conditions.

[0010] Optionally, the outer abutment body is an annular structure.

[0011] By adopting the above technical solution, a uniform supporting force is provided during the drilling process, and the swing of the drill rod and the drill bit is reduced.

[0012] Optionally, chamfers are provided on the upper and lower edges of the outer abutment ring.

[0013] By adopting the above technical solution, the smoothness and efficiency of drilling are improved.

[0014] Second, The present application provides another balancer assembly for a rotary drill, wherein the outer abutment body comprises an outer base ring and a plurality of balancing protrusions; a plurality of sliding grooves are spaced apart on the outer circumference of the outer base ring, and a plurality of the balancing protrusions are slidably connected in the corresponding sliding grooves; when the plurality of the balancing protrusions slide to the point farthest from the center of the outer base ring, the outermost circle diameter of the enclosed circle is equal to the maximum diameter of the drill bit of the rotary drill; the outer abutment body is also provided with a driving assembly for driving the plurality of the balancing protrusions to move.

[0015] By adopting the above technical solution, the balancer assembly can leave enough space for the mud to adhere to the well wall during mud pouring.

[0016] Optionally, chamfers are provided on the upper and lower edges of the balancing protrusion.

[0017] Optionally, the outer base ring and the inner connecting ring are connected via a plurality of connecting blocks.

[0018] By adopting the above technical solution, the connection strength of the internal and external structures is enhanced.

[0019] Optionally, the driving assembly includes a driving member, a driving ring and a reset member; a rotation groove is concentrically opened in the outer base ring, and the driving ring is rotatably connected in the rotation groove; the driving member is arranged in the connecting block to drive the driving ring to rotate; the rotation groove is connected to the slide groove, and the balancing protrusion can penetrate into the rotation groove; a plurality of lifting parts are arranged on the outer wall of the driving ring, and the lifting parts can push the balancing protrusion away from the center of the outer base ring; the reset member always makes the balancing protrusion have a tendency to move toward the center of the outer base ring.

[0020] By adopting the above technical solution, the driving ring is rotated by the driving member, and then the balancing lug is pushed out by the lifting part, so that the balancer assembly can quickly adjust the diameter according to different drilling requirements, thereby improving work efficiency and adaptability.

[0021] Optionally, the inner wall of the driving ring is provided with teeth, and the output end of the driving member is connected to a driving gear; the driving gear meshes with the teeth.

[0022] Thirdly, The present application provides a drill rod system, which is applicable to the balancer assembly for rotary drilling as described in the first aspect or the second aspect, and comprises a plurality of mutually nested steel pipes, wherein the balancer is connected to the corresponding ends of the steel pipes.

[0023] By adopting the above technical solution, a complete drill pipe system is constructed by connecting the balancer assembly to the ends of the mutually nested steel pipes.

[0024] In summary, the present application includes at least one of the following beneficial effects: 1. By designing a balancer with several interval settings, the balancer can effectively balance the lateral force on the drill rod and the drill bit during the drilling process, reduce the vibration and deflection caused by eccentricity, and improve the drilling accuracy and efficiency.

[0025] 2. By dividing the outer abutment body into an outer base ring and a plurality of balancing protrusions, and allowing the balancing protrusions to slide in the slide groove to adjust the diameter, the balancer assembly can leave enough space for the mud to adhere to the well wall during mud pouring.

[0026] 3. By connecting the balancer assembly to the ends of the nested steel pipes, a complete drill pipe system is constructed. This system inherits all the advantages of the balancer assembly, such as stability, flexibility and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the drilling process of Example 1; Figure 2 This is a schematic diagram of the enlarged structure at point A.

[0028] Figure 3 is a schematic diagram of the structure of a balancer in Embodiment 1; Figure 4 It is a schematic diagram of the overall structure of the second embodiment; Figure 5 This is a schematic diagram of the enlarged structure at B. Figure 6 is a schematic diagram of a cross-sectional structure of a balancer in a second embodiment; Figure 7 is a schematic diagram of a side cross-sectional structure of a balancer of Embodiment 2; Figure 8 This is a schematic diagram of the enlarged structure at point C.

[0029] Explanation of the accompanying drawings: 1. drill rod; 11. steel pipe; 2. balancer; 3. external abutment body; 31. chamfer; 4. external base ring; 41. slide groove; 42. rotation groove; 43. guide groove; 44. power groove; 5. internal connecting ring; 51. reinforcing rib; 52. connecting block; 6. balancing protrusion; 62. push rod; 63. guide block; 71. driving member; 711. active bevel gear; 72. driving ring; 721. lifting part; 722. teeth; 73. active gear; 731. driven bevel gear; 74. reset member; 8. drill bit. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 To Attachment Figure 8 This application is described in further detail.

[0031] Embodiment 1: The rotary drilling equipment in the prior art generally includes a drill rod, a drill bit and a driving device. The drill bit is connected to the end of the drill rod, and the driving device drives the drill rod to rotate or move up and down. Several steel pipes of the drill rod are nested to form a telescopic structure, and the steel pipes are relatively locked and moved simultaneously by internal and external driving keys.

[0032] The existing technology is easily affected by vibration or gravity during drilling, resulting in deviation from the preset trajectory or unstable straightness. Especially when transitioning from a soil geological structure to a rock geological structure, the vibration generated by the drill bit is particularly strong due to geological differences, which is more likely to cause trajectory deviation.

[0033] Therefore, in order to make the rotary drill move more stably during drilling. Figure 1 and Figure 2The present embodiment discloses a balancer assembly for rotary drilling, comprising a plurality of balancers 2. The balancer 2 is connected to the corresponding end of the steel pipe, that is, one end close to the adjacent steel pipe. The balancer 2 comprises an outer abutment body 3 and an inner connecting ring 5. The inner connecting ring 5 is coaxially detachably connected to the steel pipe 11, preferably by threaded connection. The outermost circle diameter of the outer abutment body 3 is equal to the maximum diameter of the drill bit 8 of the rotary drilling drill, that is, equal to the drilling hole diameter of the rock layer. During the drilling process, the straightness of the drill pipe 1 is maintained by the balancers 2 arranged at intervals. Among them, the inner connecting ring 5 connects different sections of the drill pipe 1, so that different inner connecting rings 5 ​​can move while the drill pipe 1 is extended and retracted, thereby adjusting the interval between the balancers 2, and the outer abutment body 3 abuts the well wall from the inside, thereby supporting the drill pipe 1 to maintain balance and move along the well axis. In this way, the vibration or gravity generated during the drilling process of the drill bit 8 is reduced. The lateral force on the drill pipe 1 and the drill bit 8 is effectively balanced, the vibration and deflection caused by eccentricity are reduced, and the drilling accuracy and efficiency are improved.

[0034] Please refer to Figure 3 Furthermore, the outer abutment body 3 and the inner connection ring 5 are connected by a plurality of reinforcing ribs 51. The plurality of reinforcing ribs 51 are added between the outer abutment body 3 and the inner connection ring 5, which significantly enhances the overall structural strength of the balancer 2. It can not only withstand greater lateral forces, but also maintain the stability and reliability of the structure under complex geological conditions, thereby extending the service life of the equipment.

[0035] Please refer to Figure 3 Furthermore, the outer abutment body 3 is an annular structure. The outer abutment body 3 with an annular structure can better fit the outer contour of the drill bit 8, thereby providing uniform support during the drilling process. This design helps to reduce the swing of the drill rod 1 and the drill bit 8, and further improves the drilling stability.

[0036] Please refer to Figure 3 Furthermore, the upper and lower edges of the outer abutment ring are both provided with chamfers 31. The chamfers 31 are provided on the upper and lower edges of the outer abutment ring, which can effectively reduce the direct impact with the soil or rock during the drilling process, reduce wear and resistance, and improve the smoothness and efficiency of drilling.

[0037] The implementation principle of this embodiment is: During the drilling process, the balancers 2 are arranged at intervals to maintain the straightness of the drill pipe 1. The inner connecting rings 5 ​​connect different sections of the drill pipe 1, so that different inner connecting rings 5 ​​can move as the drill pipe 1 expands and contracts, thereby adjusting the intervals between the balancers 2. The outer abutment body 3 abuts against the well wall from the inside, thereby supporting the drill pipe 1 to maintain balance and move along the well axis.

[0038] Embodiment 2: In some deep well drilling projects, in order to prevent the well wall from collapsing, mud injection is required during the drilling process, and mud adheres to the well wall to form a mud wall. Due to the setting of the balancer 2, the mud wall will be blocked, the continuity will be destroyed, and the strength of the mud wall will be low. In order to further improve the versatility of the balancer 2 assembly. The difference between this embodiment and the first embodiment is that the structure of the external abutment body 3 is different.

[0039] Please refer to Figure 4 and Figure 5 Specifically, the outer abutment body 3 includes an outer base ring 4 and a plurality of balancing protrusions 6. A plurality of slide grooves 41 are provided at intervals on the outer peripheral side of the outer base ring 4, and a plurality of balancing protrusions 6 are slidably connected in the corresponding slide grooves 41. When a plurality of balancing protrusions 6 slide to the point farthest from the center of the outer base ring 4, the outermost diameter of the circle enclosed is equal to the maximum diameter of the drill bit 8 of the rotary drill. That is, the balancer 2 in this embodiment abuts against the well wall through the balancing protrusions 6, which is different from the embodiment 1 that directly abuts against the well wall by the outer abutment body 3. The drill rod 1 is kept centered by the balancing protrusions 6. The outer abutment body 3 is also provided with a driving assembly for driving a plurality of balancing protrusions 6 to move, and the balancing protrusions 6 can be received into the slide groove 41 after sliding, or partially pass through the slide groove 41 after sliding. In this way, the outer abutment body is divided into two parts, and the outer base ring 4 serves as the basis for carrying the balancing protrusions 6, and abuts against the well wall through the balancing protrusions 6, so that the drill rod 1 is centered.

[0040] Please refer to Figure 5 Further, the upper and lower edges of the balancing protrusion 6 are both provided with chamfers 31. Similar to the above, the upper and lower edges of the balancing protrusion 6 are provided with chamfers 31, which can also reduce friction and wear with the soil, and improve the durability and drilling efficiency of the component.

[0041] Please refer to Figure 5 Furthermore, the outer base ring 4 and the inner connection ring 5 are connected by a plurality of connection blocks 52, and gaps are left between adjacent connection blocks 52 to allow mud or sand to pass through. By providing a plurality of connection blocks 52 between the outer base ring 4 and the inner connection ring 5, not only the connection strength of the inner and outer structures is enhanced, but also space is provided for the installation of subsequent drive components, making the structure of the entire balancer 2 component more compact and reasonable.

[0042] Please refer to Figures 6 to 8, further, the driving assembly includes a driving member 71, a driving ring 72 and a reset member 74. The driving member 71 is a motor, and the driving assembly is also provided with components such as a power supply and a control unit, which are not described here because they belong to the prior art. An annular rotating groove 42 is concentrically provided inside the outer base ring 4, and the driving ring 72 is rotatably connected to the rotating groove 42. The driving member 71 is arranged in the connecting block 52, and the output end of the driving member 71 passes through the connecting block 52 to the rotating groove 42 to drive the driving ring 72 to rotate. The rotating groove 42 is connected to a plurality of slide grooves 41, and the balancing protrusion 6 can penetrate into the rotating groove 42 after sliding. The outer wall of the driving ring 72 is provided with a plurality of jacking portions 721, and the jacking portions 721 are arranged at intervals. The farthest distance of the jacking portion 721 from the center of the circle is greater than the radius of the driving ring 72. The joints between the jacking portion 721 and the driving ring 72 are uniformly transitioned. The balancing protrusion 6 is provided with a push rod 62, and the balancing protrusion 6 abuts against the lifting portion 721 through the push rod 62. The lifting portion 721 can push the balancing protrusion 6 away from the center of the outer base ring 4. The side wall of the balancing protrusion 6 is provided with a guide block 63, and the inner wall of the slide 41 is provided with a guide groove 43 for the guide block 63 to slide. The cooperation between the guide block 63 and the guide groove 43 makes the sliding of the balancing protrusion 6 more stable, and prevents the balancing protrusion 6 from excessive displacement and detaching from the slide 41. The reset member 74 always makes the balancing protrusion 6 have a tendency to move toward the center of the outer base ring 4. The reset member 74 is a tension spring, which is arranged in the slide 41, one end of the tension spring is connected to the balancing protrusion 6, and the other end is connected to the inner wall of the slide 41. The driving ring 72 is driven by the driving member 71 to rotate, and then the balancing protrusion 6 is pushed out or reset by the lifting portion 721. This design realizes automatic adjustment of the balancing lug 6, so that the balancer 2 component can quickly adjust the diameter according to different drilling requirements, thereby improving work efficiency and adaptability.

[0043] Please refer to Figures 6 to 8 Furthermore, the inner wall of the driving ring 72 is provided with teeth 722, and the output end of the driving member 71 is connected with a driving gear 73. The driving gear 73 is meshed with the inner side of the teeth 722. A power groove 44 is also provided in the outer base ring 4, and the output end of the driving member 71 enters the power groove 44 and is provided with a driving bevel gear 711. The driving gear 73 is coaxially provided with a driven bevel gear 731, and the driven bevel gear 731 and the driving bevel gear 711 are meshed in the power groove 44. Since the teeth 722 are provided on the inner wall of the driving ring 72 and meshed with the driving gear 73 at the output end of the driving member 71, the driving force transmission is smoother and more accurate, the energy loss and noise generation are reduced, and the overall performance of the system is improved. In addition, the driving member 71 can be symmetrically provided with multiple groups, so as to balance the power output to the driving ring 72, so that the driving ring 72 can rotate more stably.

[0044] The implementation principle of this embodiment is: By dividing the outer abutment body 3 into an outer base ring 4 and a plurality of balancing protrusions 6 and allowing the balancing protrusions 6 to slide in the slide grooves 41 to adjust the diameter, the balancer assembly can leave enough space for the mud to adhere to the well wall during mud pouring.

[0045] Embodiment three: Please refer to Figure 1 and Figure 2 This embodiment provides a drill rod system, which is suitable for the balancer assembly for rotary drilling as in the first or second embodiment. It includes a plurality of mutually nested steel pipes 11, and the balancer 2 is connected to the ends of the corresponding steel pipes 11. By connecting the balancer assembly to the ends of the mutually nested steel pipes 11, a complete drill rod system is constructed. This system not only inherits all the advantages of the balancer assembly, such as stability, flexibility and efficiency, but also improves the overall strength and rigidity through the nested design of the steel pipes 11, making the entire drill rod system more suitable for deep hole drilling operations.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A balancer assembly for a rotary drill, characterized in that: The invention comprises a plurality of balancers (2) arranged at intervals; the balancer (2) comprises an outer abutment body (3) and an inner connection ring (5); the inner connection ring (5) is connected to a corresponding section of a rotary drill rod (1); the outermost circle diameter of the outer abutment body (3) is equal to the maximum diameter of a drill bit (8) of the rotary drill.

2. A balancer assembly for a rotary drill according to claim 1, characterized in that: The outer abutment body (3) and the inner connection ring (5) are connected via a plurality of reinforcing ribs (51).

3. A balancer assembly for a rotary drill according to claim 1, characterized in that: The outer abutment body (3) is an annular structure.

4. A balancer assembly for a rotary drilling rig according to claim 3, characterized in that: The upper and lower end edges of the outer abutment ring are both provided with chamfers (31).

5. The balancer assembly for a rotary drill according to claim 1, characterized in that: The outer abutment body (3) comprises an outer base ring (4) and a plurality of balancing protrusions (6); a plurality of sliding grooves (41) are provided at intervals on the outer circumference of the outer base ring (4), and a plurality of the balancing protrusions (6) are slidably connected to the corresponding sliding grooves (41); when the plurality of the balancing protrusions (6) slide to the point farthest from the center of the outer base ring (4), the outermost diameter of the circle enclosed is equal to the maximum diameter of the drill bit (8) of the rotary drill; the outer abutment body (3) is also provided with a driving component for driving the plurality of the balancing protrusions (6) to move.

6. A balancer assembly for a rotary drill according to claim 5, characterized in that: The upper and lower edges of the balancing protrusion (6) are both provided with chamfers (31).

7. A balancer assembly for a rotary drill according to claim 6, characterized in that: The outer base ring (4) and the inner connecting ring (5) are connected via a plurality of connecting blocks (52).

8. A balancer assembly for a rotary drill according to claim 7, characterized in that: The driving assembly comprises a driving member (71), a driving ring (72) and a reset member (74); a rotation groove (42) is coaxially provided in the outer base ring (4), and the driving ring (72) is rotatably connected to the rotation groove (42); the driving member (71) is arranged in the connecting block (52) to drive the driving ring (72) to rotate; the rotation groove (42) is communicated with the slide groove (41), and the balancing protrusion (6) can penetrate into the rotation groove (42); a plurality of lifting portions (721) are provided on the outer wall of the driving ring (72), and the lifting portions (721) can push the balancing protrusion (6) away from the center of the outer base ring (4); the reset member (74) always makes the balancing protrusion (6) have a tendency to move towards the center of the outer base ring (4).

9. A balancer assembly for a rotary drilling rig according to claim 8, characterized in that: The inner wall of the driving ring (72) is provided with teeth (722); the output end of the driving member (71) is connected to a driving gear (73); the driving gear (73) meshes with the teeth (722).

10. A drill rod system, applicable to the balancer assembly for rotary drilling according to any one of claims 1 to 9, characterized in that: It comprises a plurality of mutually nested steel pipes (11), wherein the balancer (2) is connected to the ends corresponding to the steel pipes (11).

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