A through-tubing drill pipe that prevents the rupture of an insulating female head

Abstract

The utility model relates to a kind of cable-through drill pipes for preventing insulating female head breakage, including hollow and both ends open drill pipe body, its both ends are respectively provided with first body connector and second body connector, first body connector and second body connector can be adaptively connected;Insulating tube, it is sleeved in the drill pipe body, the insulating tube and the drill pipe body are supported between by positioning member, and the fluid passage is formed between the outer wall of the insulating tube and the inner wall of the drill pipe body, the both ends of the insulating tube are respectively connected with insulating male head and insulating female head, the insulating male head and the insulating female head can be adaptively connected by sealing element, the insulating male head and insulating female head are correspondingly set in the first body connector and second body connector, and the end of the insulating female head towards the insulating tube is located in the insulating tube and the connection of both is not provided sealing element.Adaptively, the present application can avoid that insulating female head breaks due to excessive internal pressure.

Description

Technical Field

[0001] This utility model relates to the technical field of cable drill rods, and more particularly to a cable drill rod that prevents the insulation female head from breaking. Background Technology

[0002] Cable-through drill pipe is a special type of drill pipe used in directional drilling. It not only has the function of ordinary drill pipes to transmit torque and axial force to achieve drilling, but also can establish a current transmission channel from the bottom of the well to the surface system.

[0003] During drilling, the drill pipe generates a significant amount of heat due to friction between the drill pipe and the rock. Simultaneously, drilling fluid is injected into the borehole through the drill pipe to reduce friction between the drill pipe and the wellbore and to cool it down. The rock fragments (cuttings) broken off by the drill pipe are then carried to the surface through the annular space between the drill pipe and the wellbore. To prevent the current inside the conductive column of the drill pipe from "short-circuiting" through the drilling fluid and to ensure that electrical and data signals are transmitted without loss to the front-end measuring instruments, an insulating layer is installed between the conductive column and the cuttings discharge fluid channel to achieve insulation.

[0004] The insulating female head in cable drill rods is usually made of engineering plastics. However, cable drill rods need to be repeatedly installed and removed during use. After repeated installation and removal, the side wall of the insulating female head may crack, requiring replacement of the insulating female head. This results in high maintenance costs and inconvenience in use. Utility Model Content

[0005] Therefore, there is a need to provide a cable drill rod that prevents the insulation female head from breaking, in order to solve the problem of easy breakage of the insulation female head in existing cable drill rods.

[0006] To achieve the above objectives, the inventors have provided a cable drill rod for preventing breakage of the insulating female end, comprising:

[0007] The drill pipe body is hollow and open at both ends, with a first body connector and a second body connector respectively provided at both ends, and the first body connector and the second body connector can be adapted to be connected.

[0008] An insulating tube is fitted inside the drill rod body. The insulating tube and the drill rod body are supported by a positioning element, and a fluid channel is formed between the outer wall of the insulating tube and the inner wall of the drill rod body. An insulating male connector and an insulating female connector are respectively connected to both ends of the insulating tube. The insulating male connector and the insulating female connector can be adapted to each other through a sealing element. The insulating male connector and the insulating female connector are respectively arranged in the first body connector and the second body connector. The end of the insulating female connector facing the insulating tube is located inside the insulating tube, and no sealing element is provided at the connection and adaptation point between the two.

[0009] Furthermore, a conductive post is sleeved inside the insulating tube, and a first washer is sleeved outside the conductive post. The first washer is correspondingly disposed at the connection between the insulating female and the insulating tube, and a certain gap is provided between the first washer and the end of the insulating female facing the insulating tube.

[0010] Furthermore, the value of the gap ranges from 1 to 2 mm.

[0011] Furthermore, the outer wall of the first washer is clearance-fitted with the inner wall of the insulating tube.

[0012] Furthermore, the insulating male connector and the insulating tube are sealed together by a first sealing ring.

[0013] Furthermore, the insulating male connector and the insulating female connector are sealed together by a second sealing ring.

[0014] Furthermore, it also includes a conductive post, which is sleeved inside the insulating tube. The two ends of the conductive post are respectively provided with a first conductive connector and a second conductive connector. The first conductive connector is located inside the insulating female connector, and the second conductive connector is located inside the insulating male connector. The first conductive connector and the second conductive connector can be adapted to be connected, and when adapted to be connected, the first conductive connector and / or the second conductive connector will undergo radial elastic deformation.

[0015] Unlike existing technologies, the above technical solution has the following advantages: The end of the insulating female connector facing the insulating tube is located inside the insulating tube, and no seal is provided at the connection point between the two. Specifically, no seal is provided at the tight connection surface between the insulating female connector and the insulating tube, nor at the end face of the insulating female connector facing the insulating tube. When two through-cable drill rods are connected, the insulating male connector is inserted into the insulating female connector. The liquid inside the insulating female connector is squeezed into the insulating tube by the insulating male connector and air pressure, preventing excessive pressure inside the insulating female connector from causing rupture. Furthermore, since the insulating tube, insulating male connector, and insulating female connector are still sealed and isolated between the conductive post and the fluid channel, even if the liquid inside the insulating female connector is squeezed into the insulating tube and directly contacts the conductive post, the liquid in the fluid channel will not leak into the insulating tube and contact the conductive post during drilling, thus preventing short circuits in the conductive post. This extends the service life of the insulating female connector, reduces replacement frequency, and lowers maintenance costs. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the first body connecting head end of the cable-connecting drill rod in this application;

[0017] Figure 2 This is a cross-sectional view of the second body connection head end of the cable-connecting drill rod in this application;

[0018] Figure 3This is a schematic diagram of the docking of the first body connector and the second body connector in this application.

[0019] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 5 This is a perspective view of the first conductive connector in this application;

[0021] Figure 6 This is a side view of the first conductive connector in this application.

[0022] Explanation of reference numerals in the attached figures:

[0023] X, radial direction;

[0024] Y-axis;

[0025] 11. Drill pipe body;

[0026] 12. First body connector;

[0027] 13. Second body connector;

[0028] 21. Insulating tube;

[0029] 22. Insulating female connector;

[0030] 23. Insulating male connector;

[0031] 31. Conductive column;

[0032] 32. First conductive connector;

[0033] 321. Flexible arm;

[0034] 33. Second conductive connector;

[0035] 5. Fluid channels;

[0036] 61. Second sealing ring;

[0037] 63. First washer;

[0038] 64. First sealing ring. Detailed Implementation

[0039] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0040] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0041] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0042] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0043] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0044] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0045] As understood in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0046] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0047] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0048] After repeated disassembly and reassembly of the cable drill rod, the sidewall of the insulating female connector cracks. Technicians usually attribute this to the fact that the insulating female connector is made of a rigid plastic, resulting in poor elasticity. However, the inventors of this application, through long-term observation and testing, discovered that the main cause of the insulating female connector cracking is that the liquid from slag removal in the operating environment of the cable drill rod can seep into the insulating female connector. When two cable drill rods are joined together, some liquid remains inside the insulating female connector. As the insulating male connector is inserted deeper, the liquid inside the insulating female connector has nowhere to drain. The sealing element on the outer sleeve of the insulating male connector causes the pressure difference between the inside of the insulating female connector and the outside to gradually increase. After joining, the inside of the insulating female connector is always under high pressure, which eventually leads to the cracking of the insulating female connector.

[0049] Please see Figure 1-6 As shown, this embodiment of a cable drill rod for preventing breakage of the insulating female connector 22 includes:

[0050] The drill pipe body 11 is hollow and open at both ends, with a first body connector 12 and a second body connector 13 respectively provided at both ends. The first body connector 12 and the second body connector 13 can be adapted to be connected.

[0051] An insulating tube 21 is sleeved inside the drill rod body 11. The insulating tube 21 and the drill rod body 11 are supported by a positioning member, and a fluid channel 5 is formed between the outer wall of the insulating tube 21 and the inner wall of the drill rod body 11. An insulating male connector 23 and an insulating female connector 22 are respectively connected to the two ends of the insulating tube 21. The insulating male connector 23 and the insulating female connector 22 can be adapted to be connected by a sealing member. The insulating male connector 23 and the insulating female connector 22 are correspondingly arranged in the second body connector 13 and the first body connector 12, and the end of the insulating female connector 22 facing the insulating tube 21 is located inside the insulating tube 21, and no sealing member is provided at the connection and adaptation point between the two.

[0052] In this embodiment, the cable drill rod further includes a conductive post 31, which is sleeved inside the insulating tube 21. A first conductive connector 32 and a second conductive connector 33 are respectively provided at both ends of the conductive post 31. The first conductive connector 32 is located inside the insulating female connector 22, and the second conductive connector 33 is located inside the insulating male connector 23. The first conductive connector 32 and the second conductive connector 33 are adaptably connected, and when adapted, the first conductive connector 32 and / or the second conductive connector 33 undergo radial elastic deformation. Radial elastic deformation of the first conductive connector 32 and / or the second conductive connector 33 means that the first conductive connector 32 undergoes elastic deformation, but the second conductive connector 33 does not, or the first conductive connector 32 does not undergo elastic deformation, but the second conductive connector 33 does, or both undergo elastic deformation. After the first conductive connector 32 and / or the second conductive connector 33 undergo radial elastic deformation, they can make closer contact, reducing the resistance to current flow and improving the current conduction effect.

[0053] like Figure 4-5As shown, in some embodiments, the first conductive connector 32 includes multiple elastic arms 321 arranged in a circumferential array, with a gap between adjacent elastic arms 321. In this embodiment, all elastic arms 321 are the same in shape and size. Taking four elastic arms 321 as an example, the cross-section of each elastic arm 321 is a quarter circle. When the first conductive connector 32 is inserted into the second conductive connector 33, the elastic arms 321 of the first conductive connector 32 move closer together, and under the action of elastic force, each elastic arm 321 is tightly attached to the inner wall of the second conductive connector 33. Specifically, during the manufacturing of the first conductive connector 32, two grooves can be cut horizontally and vertically on the cylindrical first conductive connector 32 to separate it into four evenly spaced elastic arms 321. The structure of the first conductive connector 32 in this embodiment can undergo radial elastic deformation, and after the first conductive connector 32 is inserted into the second conductive connector 33, the contact area between the two is large, achieving a tight fit and higher current conduction efficiency. In some more preferred embodiments, the spacing between each of the adjacent elastic arms 321 is 0.05-0.1 times the diameter of the first conductive connector 32.

[0054] The cross-sections of the first body connector 12, the second body connector 13, the insulating male connector 23, the insulating female connector 22, the first conductive connector 32, and the second conductive connector 33 are configured to be circular, so that when the first body connector 12 and the second body connector 13 are screwed together, the insulating male connector 23 and the insulating female connector 22, and the first conductive connector 32 and the second conductive connector 33 can rotate relative to each other.

[0055] The first body connector 12 and the second body connector 13 can be adapted to be connected in that the end of the first body connector 12 away from the drill pipe body 11 can be adapted to be connected to the end of the second body connector 13 away from the drill pipe body 11; the insulating male connector 23 and the insulating female connector 22 can be adapted to be connected in that the end of the insulating male connector 23 away from the insulating tube 21 can be adapted to be connected to the end of the insulating female connector 22 away from the insulating tube 21; the first conductive connector 32 and the second conductive connector 33 can be adapted to be connected in that the end of the first conductive connector 32 away from the conductive post 31 can be adapted to be connected to the end of the second conductive connector 33 away from the conductive post 31.

[0056] The first body connector 12 and the second body connector 13 are fixed to the drill pipe body 11 by welding. The insulating male connector 23 and the insulating female connector 22 are usually detachably connected to the insulating tube 21. The first conductive connector 32 and the second conductive connector 33 are also usually detachably connected to the conductive post 31.

[0057] like Figure 3The first body connector 12 and the second body connector 13 are generally designed as a screw-in male and female connector structure, while the insulating male connector 23 and the insulating female connector 22, the first conductive connector 32 and the second conductive connector 33 are usually designed as a plug-in male and female connector structure. For example, the first body connector 12 is a male connector with external threads, and the second body connector 13 is a female connector with internal threads. In use, when the first body connector 12 (male connector) of one cable drill rod is screwed into the second body connector 13 (female connector) of another cable drill rod, the insulating female connector 22 and the insulating male connector 23 gradually adapt to each other, and the first conductive connector 32 gradually adapts to the second conductive connector 33. Conversely, when the first body connector 12 is detached from the second body connector 13, the insulating female connector 22 and the insulating male connector 23 gradually separate, and the first conductive connector 32 gradually separates from the second conductive connector 33.

[0058] The insulating male connector 23 and the insulating female connector 22 can be adapted to be connected through a sealing element. When the insulating male connector 23 and the insulating female connector 22 are adapted to be connected, the liquid in the fluid channel 5 will not leak from the connection point between the two into the insulating tube 21, which can prevent the liquid in the fluid channel 5 from short-circuiting with the conductive post 31.

[0059] The end of the insulating female connector 22 facing the insulating tube 21 is located inside the insulating tube 21, and no seal is provided at the connection point between the two. Specifically, no seal is provided at the tight connection surface between the insulating female connector 22 and the insulating tube 21, or at the end face of the insulating female connector 22 facing the insulating tube 21. When the two through-cable drill rods are connected, the insulating male connector 23 is inserted into the insulating female connector 22. The liquid inside the insulating female connector 22 is squeezed into the insulating tube 21 by the insulating male connector 23 and air pressure, avoiding excessive pressure inside the insulating female connector 22 that could cause it to rupture. Since the insulating tube 21, the insulating male connector 23, and the insulating female connector 22 are still sealed and isolated between the conductive post 31 and the fluid channel 5, even if the liquid inside the insulating female connector 22 is squeezed into the insulating tube 21 and comes into direct contact with the conductive post 31, the liquid in the fluid channel 5 will not leak into the insulating tube 21 and come into contact with the conductive post 31 during drilling. This still avoids short circuits in the conductive post 31, thereby extending the service life of the insulating female connector 22, reducing the frequency of replacement, and lowering maintenance costs.

[0060] like Figure 1 , Figure 4 As shown, in some embodiments, a conductive post 31 is sleeved inside the insulating tube 21, and a first washer 63 is sleeved outside the conductive post 31. The first washer 63 is correspondingly disposed at the connection between the insulating female head 22 and the insulating tube 21, and a certain gap is provided between the first washer 63 and the end of the insulating female head 22 facing the insulating tube 21.

[0061] like Figure 4As shown, specifically, a certain gap 'a' is provided between the end face of the first washer 63 facing the insulating female head 22 and the end face of the insulating female head 22 facing the insulating tube 21. The first washer 63 can prevent the conductive post 31 from shaking inside the insulating tube 21, thus improving the structural stability of the cable drill rod. Of course, to enhance the above effect, multiple first washers 63 can be provided. In addition, since the first washer 63 is located at the connection between the insulating female head 22 and the insulating tube 21, the first washer 63 also plays an axial buffering role when the two cable drill rods are connected. The first washer 63 and the end of the insulating female connector 22 facing the insulating tube 21 are provided with a certain gap, so that the first washer 63 has no sealing effect on the end of the insulating female connector 22 facing the insulating tube 21. When the insulating female connector 22 and the insulating male connector 23 are matched, the insulating male connector 23 is inserted into the insulating female connector 22. The liquid in the insulating female connector 22 will flow into the cable drill rod along the insulating female connector 22 and the conductive post 31. When the liquid passes through the end of the insulating female connector 22 facing the insulating tube 21, it will flow through the gap and squeeze the first washer 63 under pressure. It will continue to flow into the gap between the conductive post 31 and the insulating tube 21 from the gap between the first washer 63 and the conductive post 31 or the gap between the first washer 63 and the insulating tube 21, thereby avoiding the liquid from being pressed into the insulating female connector 22 and causing excessive internal pressure and damage.

[0062] In some embodiments, the gap ranges from 1 to 2 mm.

[0063] In some embodiments, the outer wall of the first washer 63 is clearance-fitted with the inner wall of the insulating tube 21. The advantage of this is that when liquid in the insulating female connector 22 flows through the gap between the first washer 63 and the insulating female connector 22, it can continue to flow from the gap between the outer wall of the first washer 63 and the inner wall of the insulating tube 21 into the insulating tube 21 under continuous pressure.

[0064] like Figure 1-3 As shown, in some embodiments, the insulating male connector 23 and the insulating tube 21 are sealed together by a first sealing ring 64. When the cable drill rod is in use, the liquid in the fluid channel 5 will not leak from the mating point of the insulating male connector 23 and the insulating tube 21 into the insulating tube 21, preventing a short circuit between the conductive post 31 in the insulating tube 21 and the liquid in the fluid channel 5.

[0065] In some embodiments, there are multiple first sealing rings 64. Specifically, taking the embodiment where the insulating male connector 23 is inserted into the insulating tube 21 as an example, a sealing groove is provided on the outer wall of the end of the insulating male connector 23 facing the insulating tube 21. The first sealing ring 64 is fitted inside the sealing groove. After the insulating male connector 23 is inserted into the insulating tube 21, the sealing ring on the insulating male connector 23 seals the space between the insulating male connector 23 and the insulating tube 21. Of course, to improve the sealing effect, multiple sealing grooves can be arranged in an array along the length of the end of the insulating male connector 23 facing the insulating tube 21, and a first sealing ring 64 can be provided on each sealing groove.

[0066] In some embodiments, the insulating male connector 23 and the insulating female connector 22 are sealed together by a second sealing ring 61. Specifically, a sealing groove is provided on the outer wall of the end of the insulating male connector 23 away from the insulating tube 21, and the second sealing ring 61 is fitted inside the sealing groove. After the insulating male connector 23 is inserted into the insulating female connector 22, the second sealing ring 61 on the insulating male connector 23 seals the space between the insulating male connector 23 and the insulating female connector 22. Of course, to improve the sealing effect, multiple sealing grooves can be arranged in an array along the length of the end of the insulating male connector 23 away from the insulating tube 21, and a second sealing ring 61 can be provided on each sealing groove.

[0067] In some embodiments, there are multiple second sealing rings 61.

[0068] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A cable-carrying drill rod for preventing breakage of the insulating female end, characterized in that, include: The drill pipe body is hollow and open at both ends, with a first body connector and a second body connector respectively provided at both ends, and the first body connector and the second body connector can be adapted to be connected. An insulating tube is fitted inside the drill rod body. The insulating tube and the drill rod body are supported by a positioning element, and a fluid channel is formed between the outer wall of the insulating tube and the inner wall of the drill rod body. An insulating male connector and an insulating female connector are respectively connected to both ends of the insulating tube. The insulating male connector and the insulating female connector can be adapted to each other through a sealing element. The insulating male connector and the insulating female connector are respectively arranged in the first body connector and the second body connector. The end of the insulating female connector facing the insulating tube is located inside the insulating tube, and no sealing element is provided at the connection and adaptation point between the two.

2. The cable-passing drill rod for preventing breakage of the insulating female head according to claim 1, characterized in that: The insulating tube is fitted with a conductive post, and the conductive post is fitted with a first washer. The first washer is correspondingly disposed at the connection between the insulating female and the insulating tube, and a certain gap is provided between the first washer and the end of the insulating female facing the insulating tube.

3. The cable drill rod for preventing breakage of the insulating female head according to claim 2, characterized in that: The gap ranges from 1 to 2 mm.

4. The cable drill rod for preventing breakage of the insulating female head according to claim 2, characterized in that: The outer wall of the first washer is clearance-fitted with the inner wall of the insulating tube.

5. The cable drill rod for preventing breakage of the insulating female head according to claim 1, characterized in that: The insulating male connector and the insulating tube are sealed together by a first sealing ring.

6. The cable drill rod for preventing breakage of the insulating female head according to claim 1, characterized in that: The insulating male connector and the insulating female connector are connected by a second sealing ring.

7. The cable drill rod for preventing breakage of the insulating female head according to claim 1, characterized in that: It also includes a conductive post, which is sleeved inside the insulating tube. A first conductive connector and a second conductive connector are respectively provided at both ends of the conductive post. The first conductive connector is located inside the insulating female connector, and the second conductive connector is located inside the insulating male connector. The first conductive connector and the second conductive connector can be adapted to be connected, and when adapted to be connected, the first conductive connector and / or the second conductive connector will undergo radial elastic deformation.

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