Self-dismounting drill rod, connecting and dismounting method thereof and multi-channel integrated drill rod system

Abstract

The invention relates to a self-dismounting drill rod, an adding and dismounting method thereof and a multi-channel integrated drill rod system, and belongs to the technical field of drilling engineering. The self-dismounting drill rod is composed of a male connector, a female connector and a through pipe body, the end of the male connector is provided with male threads, the end of the female connector is provided with matched internal threads and a special-shaped inner hole, the special-shaped inner hole is matched with the polygonal tenon of the power head to drive the drill rod to be screwed or dismounted, and the screwing direction of the male threads and the female threads is consistent with the drilling direction. According to the method, the tenon is inserted into the special-shaped inner hole and rotates, and automatic connection and disassembly are achieved; the multi-channel integrated system adopts multi-channel tenon cooperative operation, and supports independent or synchronous operation of multiple drill rods. According to the scheme, the connection strength is enhanced through torque transmission of the special-shaped inner hole and the tenon, the medium conveying continuity is guaranteed through the through type inner hole design, the application scene of complex engineering is expanded through a multi-channel cooperation mechanism, meanwhile, the equipment structure is simplified, the maintenance cost is reduced, and an innovative solution is provided for efficient and safe drilling operation.

Description

Technical Field

[0001] The invention belongs to the field of mechanical design, and relates to a self-detachable drill rod and a connection and disassembly method thereof, and a multi-channel integrated drill rod system. Background Art

[0002] In the field of drilling engineering, the drill rod is the core transmission and medium conveying component, and its connection and disassembly efficiency directly affects the construction progress and operation cost. The drill rods widely used at present generally adopt the male and female threaded connection structure, and the drill rod is extended by screwing the threads. However, this traditional design has significant limitations in practical applications. On the one hand, although the solution of using the active drill rod plus the double clamp structure can complete the rod connection operation, the double clamp system has a complex structure and needs to adjust the clamping position frequently, resulting in low disassembly efficiency, especially in deep hole operations. The time consumption is significantly increased. On the other hand, although the solution of the hydraulic chuck and the clamp simplifies some operating procedures, the water braid device needs to be disassembled and reinstalled for each additional drill rod, and the process is cumbersome and difficult to automate. In addition, although the plug-in connection drill rod simplifies the structure, its connection strength is insufficient and is only suitable for low torque conditions, and cannot meet the high-load drilling requirements under complex geological conditions.

[0003] The common defects of the existing technology are reflected in the following aspects: First, the drill pipe connection process relies on manual intervention or complex mechanical coordination, and the degree of automation is low; second, when multi-channel drill pipes are integrated, each channel needs to be operated independently, and synchronous connection or disassembly cannot be achieved, resulting in limited overall efficiency; third, when the threaded connection direction is inconsistent with the drilling rotation direction, there is a risk of loosening, which affects the safety of the operation. In response to these problems, the industry urgently needs a drill pipe technical solution that can simplify the connection mechanism, improve operating efficiency, adapt to high torque environments, and support multi-channel integration. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a self-detachable drill rod and its connection and disassembly method, and a multi-channel integrated drill rod system. While retaining the advantages of the male and female threaded connection, a special-shaped tooth structure is arranged in the inner hole of the female joint so that it can directly cooperate with the multi-faceted tenon of the power head, and the automatic screwing and separation of the drill rod can be realized through the rotation drive of the tenon.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention relates to a self-detachable drill pipe, comprising a male joint, a female joint and a pipe connecting the male joint and the female joint. The end of the male joint is provided with a male thread, and its inner hole is penetrated to form a hydraulic passage; the end of the female joint is provided with an inner thread matching the male thread, and its inner hole is a special-shaped inner hole for matching with a toothed shaft of a power head; the inner hole of the pipe is penetrated to connect the male joint and the female joint to form a hydraulic passage.

[0007] Optionally, the inner wall of the special-shaped inner hole is provided with an inner tooth structure.

[0008] Optionally, the inner tooth structure of the special-shaped inner hole is a multi-sided tenon groove, and the cross-sectional shape of the multi-sided tenon groove matches the multi-sided tenon of the power head to achieve torque transmission and axial limitation.

[0009] Optionally, both ends of the tube are fixedly connected to a male connector and a female connector respectively.

[0010] Optionally, both ends of the pipe are respectively welded to a male connector and a female connector.

[0011] Optionally, the male connector and the female connector are threadedly connected to form a drill rod extension structure, and the screwing direction of the male thread and the internal thread is consistent with the rotation direction of the drill rod during drilling.

[0012] The present invention also relates to a method for adding and removing the self-detachable drill rod, wherein the method adopts the self-detachable drill rod and comprises the following steps:

[0013] (a) Connect the male and female joints of adjacent drill pipes by threading;

[0014] (b) Insert the multi-faceted tenon of the power head into the special-shaped inner hole of the female joint and clamp the outer diameter of the drill pipe or the male joint at the other end;

[0015] (c) The multi-faceted tenon is driven to rotate, thereby driving the female joint to rotate relative to the male joint, thereby realizing the screwing or disassembly of the drill pipe.

[0016] Optionally, in a multi-drill pipe integration scenario, a multi-faceted tenon is inserted into the special-shaped inner hole of each drill pipe in turn, and the simultaneous addition or removal of multiple drill pipes is completed through segmented rotation.

[0017] The present invention also relates to a multi-channel integrated drill rod system based on the above-mentioned self-detachable drill rod, comprising at least two of the above-mentioned self-detachable drill rods; the special-shaped inner holes of the drill rods are respectively cooperated with the multi-channel driving devices of the power head through multi-channel tenons to realize independent or synchronous addition and removal of multi-channel drill rods.

[0018] Optionally, the multi-channel driving device includes a plurality of independently controlled multi-faceted tenons, each multi-faceted tenon corresponds to a special-shaped inner hole of a drill rod, and the integrated operation of the multi-channel drill rods is achieved through time-sharing or synchronous rotation.

[0019] The beneficial effects of the present invention are:

[0020] The self-detachable drill rod provided by this solution has demonstrated multi-dimensional technical advantages in drilling projects through innovative structural design and optimized working principle. Its beneficial effects are specifically reflected in the following aspects:

[0021] 1. Significantly improve the automation level of drill pipe connection and removal

[0022] Traditional drill pipe connection relies on manual operation or complex mechanical devices (such as double clamps, hydraulic chucks), which require repeated adjustment of the clamping position or removal of the water braid device. The process is cumbersome and time-consuming. This solution sets an internal tooth structure in the special-shaped inner hole of the female connector so that it can directly cooperate with the multi-faceted tenon of the power head, and uses the rotation of the tenon to drive the drill pipe to rotate relative to each other. This design does not require an additional clamping mechanism, and the screwing or separation action can be completed only through the engagement of the tenon with the special-shaped inner hole, realizing the full process automation of drill pipe connection and removal. Especially in the multi-drill pipe integration scenario, the multi-channel tenons can be operated independently or synchronously, which further simplifies the collaborative management of multi-channel drill pipes, greatly reduces the frequency of manual intervention, and improves work efficiency.

[0023] 2. Enhance connection strength and operation safety

[0024] The existing plug-in drill pipe has insufficient connection strength due to structural limitations and is difficult to withstand high torque loads, while the traditional threaded connection has the risk of loosening due to the mismatch between the rotation direction and the drilling direction. This solution solves the above problems through a double protection design: First, the male and female joints are connected by high-strength threads, and the thread rotation direction is consistent with the drilling direction, ensuring that the threads are self-locking during the rotary drilling process to avoid loosening; second, the multi-faceted tenon groove of the special-shaped inner hole of the female joint fits tightly with the tenon of the power head, forming a dual role of axial limit and torque transmission, which can still ensure the stability and reliability of the drill pipe connection even under complex geological conditions or high-load conditions, significantly reducing the risk of operation interruption or equipment damage.

[0025] 3. Optimize the integrity of the hydraulic channel and improve the efficiency of medium transportation

[0026] The penetration design of the inner hole of the drill pipe is the key to the efficient transportation of hydraulic, mud and other media. In the traditional solution, frequent disassembly of the water braid device or adjustment of the clamping position can easily lead to misalignment of the inner hole or seal failure. This solution ensures the continuity and sealing of the inner hole channel through a welded integrated structure (male joint, pipe, and female joint are welded). The inner holes of the threaded connection between the male joint and the female joint are precisely aligned to avoid medium leakage; the tooth-shaped structure design of the special-shaped inner hole does not affect the cross-sectional area of ​​the inner hole while achieving mechanical cooperation, ensuring the patency of the hydraulic or mud passage. This design is particularly suitable for deep hole drilling or large-flow medium transportation scenarios, and can effectively maintain the system pressure stability and extend the service life of the equipment.

[0027] 4. Support multi-channel drill pipe integration to expand application scenarios

[0028] In complex drilling projects, it is often necessary to operate multiple drill rods synchronously to achieve functions such as directional drilling and real-time monitoring. Due to structural limitations of existing technologies, multiple drill rods need to be operated independently, resulting in low connection efficiency and difficulty in coordinated control. This solution uses a modular matching design of special-shaped inner holes and multi-way tenons to allow a single power head to drive multiple drill rods in time-sharing, or to use multiple tenons to drive synchronously, to achieve independent or coordinated operation of multi-channel drill rods. For example, in coalbed methane extraction or geothermal well construction, multifunctional drill rods such as drilling, grouting, and data acquisition can be deployed simultaneously to improve the overall efficiency of the project through centralized control. In addition, the design has good scalability, and the number of channels can be flexibly increased or decreased according to project needs to meet diverse construction requirements.

[0029] 5. Reduce equipment complexity and maintenance costs

[0030] Traditional solutions require complex mechanisms such as double clamps and hydraulic chucks to achieve automated connection, which not only increases the manufacturing cost of the equipment, but also requires frequent maintenance due to component wear. This solution greatly reduces the number of mechanical parts and equipment failure rate by simplifying the connection mechanism (relying only on the tenon and the special-shaped inner hole). At the same time, the welded drill pipe structure avoids the wear problem caused by repeated disassembly of the threaded connection, extending the service life of the drill pipe. In addition, the standardized design of male and female joints facilitates mass production and rapid replacement, further reducing operation and maintenance costs, and is particularly suitable for large-scale drilling projects.

[0031] In summary, this solution has achieved technological breakthroughs in automated operation, connection strength, medium transportation, multi-channel integration and cost control through structural innovation and functional integration, providing reliable technical support for efficient, safe and intelligent drilling operations.

[0032] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0034] Figure 1 A schematic diagram of the structure of an embodiment of the present invention;

[0035] Figure 2 for Figure 1 BB cross-sectional view.

[0036] Figure numerals: 1 male connector, 2 pipe, 3 female connector, 11 male thread, 12 inner hole, 31 special-shaped inner hole, 32 inner thread. DETAILED DESCRIPTION

[0037] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways 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 only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0038] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0039] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0040] See also Figure 1-2 The specific embodiments of the self-detachable drill pipe and the supporting operation method of this scheme are as follows:

[0041] 1. Structural implementation of self-detachable drill pipe

[0042] The self-detachable drill pipe is formed into an integrated structure by welding a male connector 1, a pipe 2 and a female connector 3. The end of the male connector 1 is processed with a male thread 11, and its inner hole 12 is a through circular channel for conveying hydraulic medium or mud. The end of the female connector 3 is provided with an internal thread 32, and the rotation direction of the internal thread 32 is consistent with the rotation direction of the drill pipe during drilling to ensure the self-locking property of the threaded connection. The inner hole of the female connector 3 is designed as a special-shaped inner hole 31, and its inner wall is processed with a hexagonal mortise and tenon structure, and the cross-sectional shape of the mortise and tenon matches the hexagonal tenon of the power head. The two ends of the pipe 2 are welded to the male connector 1 and the female connector 3 respectively, and its inner hole is connected with the inner hole 12 of the male connector 1 and the special-shaped inner hole 31 of the female connector 3 to form a continuous medium conveying channel.

[0043] 2. Implementation of drill pipe connection and removal methods

[0044] (1) Single drill pipe connection: The male thread 11 of the male connector 1 of the drill pipe to be connected is screwed into the internal thread 32 of the female connector 3 of the fixed drill pipe. The initial screwing is completed manually or mechanically. Then, the hexagonal tenon of the power head is inserted into the special-shaped inner hole 31 of the female connector 3, and the clamping device fixes the outer diameter of the male connector 1. Start the power head to drive the hexagonal tenon to rotate, driving the female connector 3 to rotate relative to the male connector 1 until the male thread 11 and the internal thread 32 are completely screwed together. When disassembling, the hexagonal tenon can be rotated in the opposite direction to separate the threads.

[0045] (2) Integrated connection of multiple drill pipes: In scenarios where multiple drill pipes need to be operated synchronously, multiple hexagonal tenons are used to insert into the special-shaped inner holes 31 of each drill pipe. The male connector 1 of each drill pipe is screwed into the adjacent female connector 3 in sequence by time-sharing control or synchronous driving of the multiple tenons. When disassembling, the synchronous separation of multiple drill pipes can be achieved by operating in reverse according to the same logic.

[0046] 3. Implementation of multi-channel integrated drill pipe system

[0047] The system includes at least two of the above-mentioned self-detachable drill rods, and the special-shaped inner hole 31 of the female connector 3 of each drill rod cooperates with an independent hexagonal tenon. The power head is equipped with a multi-way drive unit, and each drive unit controls a hexagonal tenon. For example, in a directional drilling project, the first drill rod is used for drilling operations, and the special-shaped inner hole 31 of its female connector 3 cooperates with the first hexagonal tenon; the second drill rod is used for grouting, and the special-shaped inner hole 31 of its female connector 3 cooperates with the second hexagonal tenon. By independently controlling the rotation direction and speed of each tenon, the synchronous execution of functions such as drilling and grouting can be achieved.

[0048] 4. Description of the synergy of key components

[0049] The male thread 11 and the female thread 32 are screwed together to form a rigid connection. The thread rotation direction is consistent with the drilling direction, ensuring that the thread becomes tighter and tighter during the drilling process to avoid loosening.

[0050] Special-shaped inner hole 31 and hexagonal tenon: After the hexagonal tenon is inserted into the special-shaped inner hole 31, the side of the tenon fits tightly with the inner wall of the tenon groove to achieve torque transmission and axial limit. When drilling, the tenon drives the female joint 3 to rotate, driving the entire drill rod to rotate; when disassembling, the tenon rotates in the opposite direction to provide separation torque.

[0051] The through design of the inner hole 12 and the special-shaped inner hole 31: After welding, the inner hole 12 of the male connector 1, the inner hole of the tube 2 and the special-shaped inner hole 31 of the female connector 3 form an uninterrupted channel to ensure the continuity and sealing of the medium transportation.

[0052] 5. Typical application scenario examples

[0053] In the drilling of coalbed methane horizontal wells, the drill rod of this scheme is used:

[0054] (1) Fix the female joint 3 of the first drill pipe to the wellhead power head, and insert the hexagonal tenon into its special-shaped inner hole 31;

[0055] (2) driving the tenon to rotate so that the male thread 11 of the male connector 1 of the drill pipe is screwed into the internal thread 32 of the female connector 3 of the second drill pipe;

[0056] (3) Repeat the above steps to lengthen the drill string, during which the hydraulic medium is continuously delivered to the drill bit through the inner hole 12;

[0057] (4) When the drill bit needs to be replaced, the tenon is rotated in the opposite direction to remove the drill rods one by one. There is no need to remove the water braid or adjust the clamp during the whole process.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A self-detachable drill pipe, characterized in that: include: A male connector (1), a female connector (3), and a pipe (2) connecting the male connector (1) and the female connector (3); The end of the male connector (1) is provided with a male thread (11), and its inner hole (12) is connected to form a hydraulic channel; The end of the female connector (3) is provided with an internal thread (32) matching the male thread (11), and its inner hole is a special-shaped inner hole (31), and the special-shaped inner hole (31) is used to cooperate with the toothed shaft of the power head; The inner hole of the pipe (2) is connected to connect the male connector (1) and the female connector (3) to form a hydraulic channel.

2. The self-detachable drill pipe according to claim 1, characterized in that: The inner wall of the special-shaped inner hole (31) is provided with an inner tooth structure.

3. The self-detachable drill pipe according to claim 2, characterized in that: The inner tooth structure of the special-shaped inner hole (31) is a multi-sided tenon groove, and the cross-sectional shape of the multi-sided tenon groove matches the multi-sided tenon of the power head to achieve torque transmission and axial limitation.

4. The self-detachable drill pipe according to claim 1, characterized in that: The two ends of the tube (2) are fixedly connected to the male connector (1) and the female connector (3) respectively.

5. The self-detachable drill pipe according to claim 4, characterized in that: The two ends of the pipe (2) are respectively connected to the male joint (1) and the female joint (3) by welding.

6. The self-detachable drill pipe according to claim 1, characterized in that: The male connector (1) and the female connector (3) are connected by threads to form a drill rod extension structure, and the screwing direction of the male thread (11) and the internal thread (32) is consistent with the rotation direction of the drill rod during drilling.

7. A method for connecting and disassembling a drill pipe, using the self-disassembling drill pipe according to any one of claims 1 to 6, characterized in that: The following steps are involved: (a) connecting the male joint (1) and the female joint (3) of adjacent drill pipes by threading; (b) inserting the multi-faceted tenon of the power head into the special-shaped inner hole (31) of the female joint (3), and clamping the outer diameter of the drill pipe or the male joint (1) at the other end; (c) driving the multi-faceted tenon to rotate, thereby driving the female joint (3) to rotate relative to the male joint (1), thereby achieving screwing in or disassembling of the drill rod.

8. The drill pipe connection and removal method according to claim 7, characterized in that: In the scenario of multiple drill pipe integration, a multi-faceted tenon is inserted into the special-shaped inner hole (31) of each drill pipe in turn, and the synchronous connection or removal of multiple drill pipes is completed through segmented rotation.

9. A multi-channel integrated drill pipe system, characterized in that: include: At least two self-detachable drill rods according to any one of claims 1 to 8; The special-shaped inner hole (31) of the drill rod is matched with the multi-way driving device of the power head through the multi-way tenon, so as to realize the independent or synchronous connection and removal of the multi-way drill rods.

10. The multi-channel integrated drill pipe system according to claim 9, characterized in that: The multi-channel driving device comprises a plurality of independently controlled multi-faceted tenons, each of which corresponds to a special-shaped inner hole (31) of a channel drill rod, and realizes the integrated operation of the multi-channel drill rods through time-sharing or synchronous rotation.

Images