A drill rod with a righting assembly and suitable for use in multi-caliber boreholes

Abstract

The utility model provides a kind of drill pipe with righting assembly and applicable to multi-caliber drilling, the drill pipe with righting assembly and applicable to multi-caliber drilling includes multi-section drill pipe and righting assembly, righting assembly is equipped at the connecting place of two adjacent sections drill pipe, the righting assembly includes sleeve and coarse diameter joint, the coarse diameter joint is fixedly connected with two adjacent sections drill pipe, the sleeve is equipped above the coarse diameter joint and is sleeved on the drill pipe, the outer diameter of the sleeve is greater than the outer diameter of the coarse diameter joint. The drill pipe with righting assembly and applicable to multi-caliber drilling of the utility model embodiment, by setting righting assembly to limit the movement of drill pipe, the swing amplitude of drill pipe can be effectively reduced, so as to avoid the drill pipe in drilling to be waveform bending, reduce the probability of broken rod condition, improve the safety of construction.

Description

Technical Field

[0001] This utility model relates to the field of drilling equipment technology, and in particular to a drill rod with a straightening component that is suitable for drilling multiple diameter holes. Background Technology

[0002] In the field of hydrogeological exploration, wireline coring is a commonly used drilling technique. The drill pipe operates in a borehole diameter one or even two sizes larger than normal, resulting in excessively large gaps between the drill string and the borehole wall. Under these conditions, the drill string is subjected to axial pressure, its own weight, and centrifugal force, making it prone to wavy bending and generating alternating stress. Simultaneously, frequent friction and collisions between the drill string and the well wall or metal casing lead to fatigue damage, and in some cases, direct fracture due to stress exceeding the material's stress strength. In particular, wireline drill pipes themselves have low toughness, thin threads, and are relatively brittle. While suitable for drilling with small borehole clearances, their use in large-clearance conditions increases the likelihood of frequent pipe breakage and higher accident rates, severely impacting drilling efficiency and safety. Utility Model Content

[0003] This invention provides a drill rod with a straightening component that is suitable for drilling multiple diameter holes. It addresses the technical defects of existing drill rods, such as large swing amplitude and high risk of fatigue fracture. It can suppress drill rod bending deformation, reduce alternating stress damage, and improve drilling stability and drilling operation safety.

[0004] This utility model provides a drill rod with a straightening component and suitable for multi-diameter drilling, comprising:

[0005] Multi-section drill pipe;

[0006] A straightening assembly is provided at the connection between two adjacent drill pipe sections. The straightening assembly includes a sleeve and a coarse-diameter joint. The coarse-diameter joint is fixedly connected to both adjacent drill pipe sections. The sleeve is located above the coarse-diameter joint and is sleeved on the drill pipe. The outer diameter of the sleeve is larger than the outer diameter of the coarse-diameter joint.

[0007] In some embodiments, both ends of the coarse-diameter connector are provided with threaded portions, and the two threaded portions are respectively threadedly connected to the two adjacent drill rods.

[0008] In some embodiments, the threaded portion includes a first threaded portion, the top end of the coarse-diameter connector is provided with a connecting drill rod, the first threaded portion is provided on the outer surface of the coarse-diameter connector, and the inner circumferential surface of the bottom end of the drill rod is provided with a third threaded portion, the first threaded portion and the third threaded portion being threadedly connected.

[0009] In some embodiments, the threaded portion includes a second threaded portion, the inner circumferential surface of the bottom end of the coarse-diameter connector is provided with the second threaded portion, the outer circumferential surface of the top end of the drill rod is provided with a fourth threaded portion, and the second threaded portion is threadedly connected to the fourth threaded portion.

[0010] In some embodiments, the top end of the coarse-diameter connector is provided with a stepped portion, and the bottom surface of the sleeve abuts against the stepped portion.

[0011] In some embodiments, the sleeve is a nylon sleeve.

[0012] In some embodiments, the coarse-diameter fitting is made of the same material as the drill pipe.

[0013] In some embodiments, the outer diameter of the coarse-diameter connector is 1.3-1.6 times the outer diameter of the drill pipe, and the inner diameter of the coarse-diameter connector is the same as the inner diameter of the drill pipe.

[0014] In some embodiments, the outer diameter of the sleeve is 1.6-1.9 times the outer diameter of the drill pipe, and the inner diameter of the sleeve is larger than the outer diameter of the drill pipe and smaller than the outer diameter of the coarse-diameter joint.

[0015] The drill rod of this utility model, which has a straightening component and is suitable for drilling multiple diameter holes, can effectively reduce the swing amplitude of the drill rod by setting the straightening component to limit the movement of the drill rod. This prevents the drill rod from bending in a wave shape in the borehole, reduces alternating stress damage, reduces the probability of rod breakage, and thus improves the stability of the borehole and the safety of drilling operations. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the 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.

[0017] Figure 1 This is a schematic diagram of the structure of a drill rod with a straightening component and suitable for drilling multiple diameter holes, provided by this utility model.

[0018] Figure 2 This is a cross-sectional view of a drill rod with a straightening component and suitable for drilling multiple diameter holes, provided by this utility model.

[0019] Figure 3 This is a schematic diagram of the coarse-diameter joint of a drill rod with a straightening component, which is suitable for drilling multiple diameter holes, provided by this utility model.

[0020] Figure label:

[0021] 1. Drill pipe; 2. Centering assembly; 3. Sleeve; 4. Coarse diameter connector; 5. First threaded section; 6. Second threaded section; 7. Stepped section. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions 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 scope of protection of this utility model.

[0023] like Figures 1 to 3 As shown, the drill rod with a straightening component and suitable for multi-diameter drilling in this embodiment of the utility model includes multiple drill rod sections 1 and a straightening component 2. The straightening component 2 is located at the connection between two adjacent drill rod sections 1. The straightening component 2 includes a sleeve 3 and a coarse diameter connector 4. The coarse diameter connector 4 is fixedly connected to both adjacent drill rod sections 1. The sleeve 3 is located above the coarse diameter connector 4 and is sleeved on the drill rod 1. The outer diameter of the sleeve 3 is larger than the outer diameter of the coarse diameter connector 4.

[0024] A straightening assembly 2 is provided at the connection between two adjacent drill rod sections 1. The straightening assembly 2 consists of a sleeve 3 and a coarse diameter connector 4. The coarse diameter connector 4 is connected to the two adjacent drill rod sections 1 by a fixed connection. The sleeve 3 is located above the coarse diameter connector 4 and is sleeved on the outside of the drill rod 1.

[0025] The outer diameter of the sleeve 3 is designed to be larger than that of the coarse-diameter connector 4, so that the sleeve 3 is located in the gap between the drill rod 1 and the borehole. Since the drill rod 1 has multiple sections, there are multiple straightening components 2. The sleeve 3 of each straightening component 2 is arranged in the gap between the drill rod 1 and the borehole. Multiple sleeves 3 contact the borehole wall to form multi-point support, which effectively limits the swing amplitude of the drill rod 1 in the borehole and reduces the collision friction between the drill rod 1 and the borehole wall.

[0026] It should be noted that the outer diameter of the coarse-diameter connector 4 is larger than that of commonly used connectors.

[0027] In the field of hydrogeological exploration, wireline coring is a commonly used drilling technique. The drill pipe (1) operates in a borehole diameter one or even two sizes larger than normal, resulting in excessively large gaps between the drill pipe and the borehole wall. Under these conditions, the drill pipe is subjected to axial pressure, its own weight, and centrifugal force, making it prone to wavy bending and generating alternating stress. Simultaneously, the drill pipe frequently rubs and collides with the well wall or metal casing, leading to fatigue damage and even direct fracture due to stress exceeding the material's stress strength. In particular, wireline drill pipes (1) have low toughness, thin threads, and are relatively brittle. While suitable for drilling with small borehole clearances, their use in large-clearance conditions exacerbates problems such as frequent pipe breakage and increased accident rates, severely impacting drilling efficiency and safety.

[0028] The drill rod of this utility model embodiment has a straightening component and is suitable for drilling multiple diameter holes. By setting the straightening component 2 to limit the movement of the drill rod 1, the swing amplitude of the drill rod 1 can be effectively reduced, thereby avoiding the drill rod 1 from bending in a wave shape in the borehole, reducing alternating stress damage, reducing the probability of rod breakage, and thus improving the drilling stability and drilling operation safety.

[0029] In some embodiments, both ends of the coarse-diameter connector 4 are provided with threaded portions, and the two threaded portions are respectively threadedly connected to two adjacent drill rods 1.

[0030] The upper threaded part is connected to the lower end of the upper drill rod 1 by a thread, and the lower threaded part is connected to the upper end of the lower drill rod 1 by a thread, thus forming a stable mechanical fixing structure to ensure the connection strength between the coarse diameter joint 4 and the two adjacent drill rod sections 1, so that the straightening component 2 can limit the swing amplitude of the drill rod 1.

[0031] In some embodiments, the threaded portion includes a first threaded portion 5, the top end of the coarse diameter connector 4 is provided with a connecting drill rod 1, the first threaded portion 5 is provided on the outer surface of the coarse diameter connector 4, and the inner circumferential surface of the bottom end of the drill rod 1 is provided with a third threaded portion, and the first threaded portion 5 is threadedly connected to the third threaded portion.

[0032] The outer surface of the coarse diameter connector 4 is provided with a first threaded portion 5, while the inner circumferential surface of the bottom end of the drill rod 1 is provided with a third threaded portion. The first threaded portion 5 and the third threaded portion are connected by threaded engagement, thereby fixing the coarse diameter connector 4 and the drill rod 1 above it together.

[0033] This threaded connection method is not only simple in structure and easy to install and disassemble, but also ensures the reliability and coaxiality of the connection, which helps to improve the stability and working reliability of the overall drill pipe 1, while facilitating on-site operation and maintenance.

[0034] In some embodiments, the threaded portion includes a second threaded portion 6, the inner circumferential surface of the bottom end of the coarse diameter connector 4 is provided with the second threaded portion 6, the outer circumferential surface of the top end of the drill rod 1 is provided with a fourth threaded portion, and the second threaded portion 6 is threadedly connected to the fourth threaded portion.

[0035] The bottom inner circumferential surface of the coarse-diameter connector 4 is provided with a second threaded portion 6, which is used to achieve a threaded connection with the fourth threaded portion provided on the outer circumferential surface of the top end of the drill rod 1 below it. This connection method, through the mating of internal and external threads, tightly connects the coarse-diameter connector 4 with the drill rod 1 below it, further enhancing the connection strength and stability between the centralizing assembly 2 and the drill rod 1. This structural design not only facilitates assembly and disassembly, but also effectively transmits axial force and torque, ensuring the overall mechanical properties of the drill rod 1. At the same time, it also helps to improve the working reliability of the centralizing assembly 2 under complex working conditions, thereby better limiting the swing of the drill rod 1 and reducing fatigue damage.

[0036] In some embodiments, the top of the coarse-diameter connector 4 is provided with a stepped portion 7, and the bottom surface of the sleeve 3 abuts against the stepped portion 7. The bottom surface of the sleeve 3 abuts against the stepped portion 7, thereby limiting its position in the vertical direction and preventing the sleeve 3 from sinking or shifting during operation. This structural design not only enhances the overall stability of the straightening assembly 2 but also ensures that the sleeve 3 is always in the predetermined installation position, enabling it to effectively provide multi-point support between the drill rod 1 and the borehole wall, further improving the smoothness of the drill rod 1's operation and the straightening effect.

[0037] In some embodiments, the sleeve 3 is a nylon sleeve. The sleeve 3 is made of nylon material, which has good wear resistance and self-lubricating properties. During contact with the borehole wall, the nylon sleeve effectively reduces frictional resistance and wear caused by frequent contact, while also providing cushioning and shock absorption, helping to protect the drill pipe 1 from impact damage. Furthermore, nylon material is relatively lightweight, easy to install and replace, and has low cost, making it suitable for continuous operation under complex working conditions, further enhancing the practicality and economy of the centering assembly 2.

[0038] In some embodiments, the coarse-diameter connector 4 is made of the same material as the drill pipe 1.

[0039] Both the coarse-diameter connector 4 and the drill pipe 1 are made of steel, possessing high strength and excellent wear resistance, enabling them to withstand significant axial pressure, torque, and impact forces from the borehole wall during drilling. The choice of steel not only ensures the structural stability of the connection between the coarse-diameter connector 4 and the drill pipe 1 but also enhances the durability and load-bearing capacity of the overall centering assembly 2, making it suitable for high-intensity operating environments under complex geological conditions. Furthermore, the steel material facilitates the machining of threaded structures, enabling a reliable threaded connection between the coarse-diameter connector 4 and the drill pipe 1. This ensures the coaxiality and smooth operation of the entire drill pipe 1 system, effectively limiting drill pipe 1 sway, preventing bending deformation, and reducing the risk of pipe breakage.

[0040] In some embodiments, the outer diameter of the sleeve 3 is 1.6-1.9 times the outer diameter of the drill rod 1, and the inner diameter of the coarse-diameter connector 4 is the same as the inner diameter of the drill rod 1.

[0041] For example, the outer diameter of the sleeve 3 is 1.6, 1.7, or 1.9 times the outer diameter of the drill rod 1. This size ratio is set to ensure that the sleeve 3 can effectively fit into the gap between the drill rod 1 and the borehole wall, and form good contact support with the borehole wall. Since the outer diameter of the sleeve 3 is significantly larger than that of the drill rod 1, it can act as a key component for straightening and shock absorption during drilling, limiting the lateral swing of the drill rod 1 through multi-point contact, and preventing bending deformation and fatigue damage caused by excessive gap.

[0042] In some embodiments, the outer diameter of the coarse-diameter connector 4 is 1.3-1.6 times the outer diameter of the drill rod 1, and the inner diameter of the sleeve 3 is larger than the outer diameter of the drill rod 1 and smaller than the outer diameter of the coarse-diameter connector 4.

[0043] For example, the outer diameter of the coarse-diameter connector 4 is 1.3, 1.5, or 1.6 times the outer diameter of the drill rod 1. On one hand, this proportion is designed to accommodate different borehole diameters. When the borehole diameter is smaller than the outer diameter of the sleeve 3, the sleeve 3 cannot enter the borehole; in this case, only the coarse-diameter connector 4 needs to be installed on the drill rod 1, which also serves a straightening function. On the other hand, when the sleeve 3 and the coarse-diameter connector 4 are used simultaneously, sufficient space and a supporting foundation are provided for the installation of the sleeve 3.

[0044] It is understandable that the inner diameter of the sleeve 3 is larger than the outer diameter of the drill pipe 1 and smaller than the outer diameter of the coarse diameter joint 4, so as to avoid the sleeve 3 being fitted on the outside of the coarse diameter joint 4, which would lead to the sleeve 3 slipping off.

[0045] In this embodiment of the invention, a drill rod with a centering component, suitable for multi-diameter drilling, is operated by first fitting a sleeve 3 over the drill rod 1. Then, the coarse-diameter connector 4 is connected to the upper and lower sections of the drill rod 1 via internal or external threads. Subsequently, the sleeve 3 is placed on the top stepped portion 7 of the coarse-diameter connector 4, with its bottom abutting against the stepped portion 7, achieving axial positioning and support. The entire installation process is simple to operate and structurally stable, effectively playing a centering role during drilling operations, limiting the swing of the drill rod 1, and improving the stability and safety of the drilling process.

[0046] It is understandable that, since there are various drilling diameters, the drill rod of this utility model, with a straightening component and suitable for multi-diameter drilling, can adapt to different drilling holes by adjusting the dimensions of the coarse-diameter connector 4 and the sleeve 3. Furthermore, the coarse-diameter connector 4 and the sleeve 3 can be used simultaneously, or the coarse-diameter connector 4 can be used alone, thus adapting to different diameters. Therefore, the drill rod of this utility model, with a straightening component and suitable for multi-diameter drilling, has high adaptability and good flexibility.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A drill rod with a centering component and suitable for multi-diameter drilling, characterized in that, include: Multi-section drill pipe (1); A straightening assembly (2) is provided at the connection of two adjacent drill rod sections (1). The straightening assembly (2) includes a sleeve (3) and a coarse diameter connector (4). The coarse diameter connector (4) is fixedly connected to both adjacent drill rod sections (1). The sleeve (3) is provided above the coarse diameter connector (4) and sleeved on the drill rod (1). The outer diameter of the sleeve (3) is larger than the outer diameter of the coarse diameter connector (4). Both ends of the coarse diameter connector (4) are provided with threaded parts, and the two threaded parts are respectively threaded to the two adjacent drill rods (1); The threaded part includes a first threaded part (5), the top end of the coarse diameter connector (4) is provided with a connecting drill rod (1), the first threaded part (5) is provided on the outer surface of the coarse diameter connector (4), and the inner circumferential surface of the bottom end of the drill rod (1) is provided with a third threaded part, and the first threaded part (5) is threadedly connected to the third threaded part. The threaded portion includes a second threaded portion (6). The inner circumferential surface of the bottom end of the coarse diameter connector (4) is provided with the second threaded portion (6), and the outer circumferential surface of the top end of the drill rod (1) is provided with a fourth threaded portion. The second threaded portion (6) is threadedly connected to the fourth threaded portion.

2. The drill rod with a centering component and suitable for multi-diameter drilling according to claim 1, characterized in that, The top of the coarse-diameter connector (4) is provided with a stepped portion (7), and the bottom surface of the sleeve (3) abuts against the stepped portion (7).

3. The drill rod with a centering component and suitable for multi-diameter drilling according to claim 1, characterized in that, The sleeve (3) is a nylon sleeve.

4. The drill rod with a centering component and suitable for multi-diameter drilling according to claim 1, characterized in that, The coarse-diameter connector (4) is made of the same material as the drill rod (1).

5. The drill rod with a centering component and suitable for multi-diameter drilling according to claim 1, characterized in that, The outer diameter of the coarse-diameter connector (4) is 1.3-1.6 times the outer diameter of the drill rod (1), and the inner diameter of the coarse-diameter connector (4) is the same as the inner diameter of the drill rod (1).

6. The drill rod with a centering component and suitable for multi-diameter drilling according to claim 1, characterized in that, The outer diameter of the sleeve (3) is 1.6-1.9 times the outer diameter of the drill rod (1), and the inner diameter of the sleeve (3) is greater than the outer diameter of the drill rod (1) and smaller than the outer diameter of the coarse diameter connector (4).

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