A screw buckle for a screw drill rod and its application and method of use

Abstract

The present application belongs to the technical field of low permeability coal seam permeability improvement, and relates to a spiral buckle for spiral drill rods, application and use method thereof. The spiral buckle is symmetrically arranged along the plane where the spiral drill rod axis is located. The inner diameter of the spiral buckle matches the outer diameter of the spiral drill rod. The outer diameter of the spiral buckle is provided with external threads. The depth of the external threads on the spiral buckle is greater than the depth of the external threads on the spiral drill rod to improve the deslagging capacity of the spiral drill rod. The inner wall of the spiral buckle is provided with internal thread grooves that match the external threads on the spiral drill rod. The spiral drill rod is reversed by fixing the spiral buckle at the connection of two spiral drill rods. The present application can increase the thread depth of the spiral drill rod without changing the existing drill model and slip size, improve the deslagging effect when the spiral drill rod rotates, and realize the reverse rotation of the spiral drill rod by connecting the drill rods through the spiral buckle.

Description

Technical Field

[0001] This invention belongs to the field of permeability enhancement technology for low-permeability coal seams, and relates to a spiral clip for auger drill rods, its application, and usage method. Background Technology

[0002] Coal is widely distributed in my country, but most of it consists of high-gas, low-permeability coal seams. This results in poor gas extraction efficiency during pre-drainage borehole drilling before coal mining, severely impacting normal mine operation and succession. In-seam long-bore waterjet slotting and pressure relief technology, as an emerging technique for solving gas extraction problems in longwall and tunneling faces, can effectively improve coal seam permeability and borehole gas extraction efficiency. It is increasingly being applied to longwall and tunneling faces in low-permeability coal seams, achieving good results. However, a major problem encountered during in-seam long-bore drilling and slotting is slag removal. Due to the generally long borehole depth, slag often causes blockage, blowouts, and drill bit jamming during borehole transport, severely affecting the effectiveness and safety of hydraulic slotting. The drill rod, as a key factor in slag removal during in-seam long-bore drilling and slotting, effectively picks up slag to prevent its accumulation at the bottom of the borehole.

[0003] Due to the size of the drill rig's slips, existing hydraulic slotting drill rods generally use shallow spiral drill rods. Because the threads on the drill rod surface are shallow, their effect on the rotation and winding of coal slag is relatively small, and their help in removing slag in in-seam drilling is also limited. At the same time, since spiral drill rods are usually connected by threads, they can only rotate forward and not backward. In the case of hole blockage, the drill rod cannot be pulled out by reversing the drill rod, resulting in frequent drill bit burial during in-seam drilling and slotting.

[0004] Therefore, it is necessary to develop a spiral clip for auger drill rods that can improve the slag removal capacity of auger drill rods and enable the auger drill rod to reverse while maintaining the existing drilling rig model and slip size. This would allow the drill rod to be pulled out by reversing the drill rod when the hole is blocked, thus avoiding the phenomenon of drill bit burying when drilling and cutting the seam in the same formation. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a spiral clip for auger drill rods, which increases the thread depth of the auger drill rod without changing the existing drilling rig model and slip size, thereby improving the auxiliary slag removal effect when the auger drill rod rotates, avoiding the phenomenon of coal slag blocking the hole during cutting, improving the success rate of ultra-high pressure hydraulic cutting in in-seam drilling, and at the same time, the auger drill rod can be reversed by connecting the drill rod through the spiral clip, so that the auger drill rod can be retrieved by reversing in the case of hole blockage and drill bit jamming.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] On one hand, the present invention provides a spiral clip for a spiral drill rod, wherein the spiral clip is symmetrically arranged along the plane containing the axis of the spiral drill rod, the inner diameter of the spiral clip matches the outer diameter of the spiral drill rod, the outer diameter of the spiral clip is provided with an external thread, and the depth of the external thread on the spiral clip is greater than the depth of the external thread on the spiral drill rod to improve the slag removal capacity of the spiral drill rod;

[0008] The inner wall of the spiral buckle is provided with an internal thread groove that matches the external thread on the spiral drill rod, so as to achieve the reversal of the spiral drill rod by fixing the spiral buckle at the connection of the two spiral drill rods.

[0009] Furthermore, the spiral buckle includes a first buckle and a second buckle symmetrically arranged along the plane containing the axis of the spiral drill rod, and the first buckle and the second buckle are fixedly connected to the spiral drill rod by bolts.

[0010] Furthermore, the external thread depth on the spiral buckle is 5mm to 30mm.

[0011] Furthermore, the inner diameter of the spiral buckle is 63mm or 73mm.

[0012] On the other hand, the present invention also provides a spiral drill rod with a spiral buckle, comprising the spiral buckle and the spiral drill rod described above, wherein the spiral buckle is provided at the connection point of two adjacent spiral drill rods.

[0013] Furthermore, each of the aforementioned spiral drill rods is provided with a spiral buckle in the middle.

[0014] This invention also provides a method for using a spiral clip for auger drill pipes, employing the aforementioned spiral clip, specifically including the following steps:

[0015] Step 1: Place the auger drill rod on the drilling rig, and use the power head and clamp of the drilling rig to drill the auger drill rod into the coal seam;

[0016] Step 2: After the connection between the first and second auger drill rods passes the clamp, pause the drilling of the auger drill rods and install the auger clip at the connection between the first and second auger drill rods. After the auger clip is installed, continue drilling of the auger drill rods.

[0017] Step 3: Repeat steps 1 and 2, and install spiral clips at the connection of the next two adjacent spiral drill rods until the spiral drill rods have drilled to the designed drilling depth.

[0018] Furthermore, in step 2, after the middle position of the first auger drill rod passes the drill rig clamp, a auger clip is installed at the middle position of the first auger drill rod, and in step 3, auger clips are installed at the middle positions of subsequent auger drill rods in sequence.

[0019] The beneficial effects of this invention are as follows:

[0020] This invention provides a spiral clip for auger drill rods. Without changing the drilling rig model or slip size, by installing a spiral clip with external threads on the outside of the drill rod, a shallow auger drill rod can be transformed into a deep auger drill rod. This increases the drill rod's auxiliary slag removal capability during selection. Simultaneously, by installing the spiral clip at the connection point of two drill rods, the internal thread groove of the spiral clip locks the two adjacent auger drill rods together. The force of reverse drilling is transmitted through the internal thread groove of the spiral clip, allowing the auger drill rod to reverse without loosening the connecting threads. Therefore, in the event of drill bit seizing, the seized drill rod can be retrieved by reversing the drill rod. Furthermore, the spiral clip for auger drill rods provided by this invention has a simple structure and is easy to install, thus offering good economic benefits.

[0021] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of a spiral drill rod with a spiral buckle in one embodiment;

[0024] Figure 2 This is a schematic diagram of the second buckle in the embodiment;

[0025] Figure 3 This is a schematic diagram of a field implementation using a spiral drill rod with a spiral clip, as shown in the example.

[0026] Reference numerals in the attached drawings: First buckle 1-1, Second buckle 1-2, Screw 2-1, Nut 2-2, First auger drill rod 3-1, Second auger drill rod 3-2, Drilling rig 4, Power head 4-1, Clamp 4-2, Coal seam 5. Detailed Implementation

[0027] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0029] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Please see Figures 1-3 This is a spiral clip for a spiral drill rod. The spiral clip is symmetrically arranged along the plane containing the axis of the spiral drill rod. The inner diameter of the spiral clip matches the outer diameter of the spiral drill rod. The outer diameter of the spiral clip is provided with an external thread, and the depth of the external thread on the spiral clip is greater than the depth of the external thread on the spiral drill rod to improve the slag removal capacity of the spiral drill rod.

[0031] The inner wall of the spiral buckle is provided with an internal thread groove that matches the external thread on the spiral drill rod. In this embodiment, the spiral drill rod is reversed by fixing the spiral buckle to the connection of two adjacent spiral drill rods. The two adjacent spiral drill rods are the first spiral drill rod 3-1 and the second spiral drill rod 3-2. The first spiral drill rod 3-1 and the second spiral drill rod 3-2 are locked by the internal thread groove of the spiral buckle. The force of reverse drilling is transmitted through the internal thread groove of the spiral buckle, which can realize the reverse rotation of the spiral drill rod without loosening the drill rod connection thread. Thus, in the case of drill jamming, the jammed drill rod can be retrieved by reversing the drill rod.

[0032] Furthermore, the spiral buckle includes a first buckle 1-1 and a second buckle 1-2 symmetrically arranged along the plane containing the axis of the spiral drill rod. The first buckle 1-1 and the second buckle 1-2 are fixedly connected to the spiral drill rod by bolts, and the bolts include a screw 2-1 and a nut 2-2 that cooperate with each other.

[0033] Preferably, the external thread depth of the spiral buckle is 5mm to 30mm, and the inner diameter of the spiral buckle is 63mm or 73mm.

[0034] In another embodiment, the external thread depth, inner diameter, and internal thread groove depth of the spiral buckle can be adaptively adjusted according to the parameters of the auger drill rod.

[0035] On the other hand, the present invention also provides a spiral drill rod with a spiral buckle, comprising the spiral buckle and the spiral drill rod described above, wherein the spiral buckle is provided at the connection point of two adjacent spiral drill rods.

[0036] Preferably, spiral clips are provided at the connection between the first spiral drill rod 3-1 and the second spiral drill rod 3-2, as well as at the middle position of the two spiral drill rods, so that the shallow spiral drill rod becomes a deep spiral drill rod, which increases the auxiliary slag removal capacity of the drill rod during the selection process. At the same time, by installing spiral clips at the connection between the two drill rods, the threads of the two drill rods are locked by the internal threads of the clips, so that the drill rods can be reversed without the connecting threads of the drill rods becoming loose. Thus, in the case of drill sticking, the stuck drill rod can be retrieved by reversing the drill rods.

[0037] This invention also provides a method for using a spiral clip for auger drill pipes, employing the aforementioned spiral clip, specifically including the following steps:

[0038] Step 1: Place the auger drill rod on the drilling rig 4, and use the power head 4-1 and the clamp 4-2 of the drilling rig 4 to drill into the coal seam 5;

[0039] Step 2: After the middle of the first auger rod passes the clamp 4-2, pause the drilling of the auger rod. Install the auger clip at the middle of the first auger rod. After the auger clip is installed, continue drilling of the auger rod.

[0040] Step 3: After the connection between the first and second auger drill rods passes the clamp 4-2, pause the drilling of the auger drill rods and install the auger clip at the connection between the first and second auger drill rods. After the auger clip is installed, continue drilling of the auger drill rods.

[0041] Step 4: Repeat steps 1, 2 and 3, and install spiral clips at the middle position of the subsequent spiral drill rod and at the connection between two adjacent spiral drill rods in sequence, until the spiral drill rod has drilled to the designed drilling depth.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A spiral clip for auger drill pipes, characterized in that: The spiral buckle is symmetrically arranged along the plane containing the axis of the spiral drill rod. The inner diameter of the spiral buckle matches the outer diameter of the spiral drill rod. The outer diameter of the spiral buckle is provided with an external thread, and the depth of the external thread on the spiral buckle is greater than the depth of the external thread on the spiral drill rod to improve the slag removal capacity of the spiral drill rod. The inner wall of the spiral buckle is provided with an internal thread groove that matches the external thread on the spiral drill rod, so as to realize the reversal of the spiral drill rod by fixing the spiral buckle to the connection of the two spiral drill rods; The spiral buckle includes a first buckle (1-1) and a second buckle (1-2) symmetrically arranged along the plane containing the axis of the spiral drill rod. The first buckle (1-1) and the second buckle (1-2) are fixedly connected to the spiral drill rod by bolts.

2. A spiral clip for a spiral drill rod according to claim 1, characterized in that: The external thread depth on the spiral buckle is 5mm~30mm.

3. A spiral clip for a auger drill rod according to claim 1, characterized in that: The inner diameter of the spiral buckle is 63mm or 73mm.

4. A spiral drill rod with a spiral snap fastener, characterized in that: Includes the spiral buckle and spiral drill rod as described in any one of claims 1 to 3, wherein the spiral buckle is provided at the connection between two adjacent spiral drill rods.

5. A spiral drill rod with a spiral buckle according to claim 4, characterized in that: The spiral buckle is provided in the middle of each of the spiral drill rods.

6. A method of using a spiral clip for a auger drill pipe, characterized in that, The use of the spiral buckle according to any one of claims 1 to 3 specifically includes the following steps: Step 1: Place the auger rod on the drilling rig (4) and drill the auger rod into the coal seam (5) through the drilling rig (4); Step 2: After the connection between the first and second auger drill rods passes through the clamp (4-2), pause the drilling of the auger drill rods and install the auger clip at the connection between the first and second auger drill rods. After the auger clip is installed, continue drilling of the auger drill rods. Step 3: Repeat steps 1 and 2, and install spiral clips at the connection of the next two adjacent spiral drill rods until the spiral drill rods have drilled to the designed drilling depth.

7. The method of using a spiral clip for a spiral drill rod according to claim 6, characterized in that: In step 2, after the first auger rod passes through the clamp (4-2) at its middle position, a auger clip is installed at the middle position of the first auger rod, and in step 3, auger clips are installed at the middle positions of subsequent auger rods in sequence.

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