Center through cable type water braid

Abstract

The utility model belongs to the technical field of drilling tools, and relates to a center through cable type water braid which comprises a water braid shell, a water braid shaft and a rear connector shell, the two ends of the water braid shaft are inserted into the rear connector shell and the water braid shell in the axial direction respectively, the water braid shaft is rotationally connected with the water braid shell, a connector lug is arranged in the rear connector shell to be connected with an external cable, and the connector lug is connected with the water braid shell. A cable bolt is arranged in the water braid shell and is far away from the rear joint shell, an external thread connected with an external through cable drill rod is arranged on the water braid shell so as to be connected with a cable socket in the external through cable drill rod, a central through cable is arranged in the water braid shaft, and two ends of the central through cable are respectively connected with a connector lug and the cable bolt; the cable bolt is provided with an expansion type plug, the expansion type plug deforms and shrinks in the radial direction under the action of external force, and the expansion type plug can be inserted into the cable socket after deformation and shrinkage. According to the utility model, the problem that the cable bolt is damaged due to non-concentric threaded connection in the screwing process of the cable bolt, the drill rod and the cable passing water braid is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling tools and relates to a central cable-through type water braid. Background Art

[0002] In the directional drilling system, the center cable type (cable braid) is a key component that carries the important function of realizing the dual connection of waterway and cable. During the rotational docking process of the cable braid and the drill pipe, the center cable needs to be automatically connected and ensure that the braid can rotate with the drill pipe during drilling, while keeping the cable fixed and tightly connected to the drill pipe cable. This complex mechanism requires the cable braid to overcome the problem of eccentricity in the cable connection. This problem is mainly reflected in two aspects: first, during the screwing process of the drill pipe and the cable braid, the eccentricity of the threaded connection causes the cable connection to deform; second, when the braid rotates with the drill pipe, the inconsistency between the rotation center and the cable center causes the cable to shake, which may lead to fatigue damage of the center cable.

[0003] Damage to the cable connection or the cable will bring a series of serious consequences, including unstable signal transmission, increased signal attenuation, and even signal interruption in the worst case, which will seriously affect the overall operation process. At present, the existing technology attempts to use a tapered spring pin design at the cable connection to deal with the problem of eccentricity at the cable connection. However, actual application shows that this conical spring design cannot effectively solve the problem of multiple eccentricities of the cable braid during rotation.

[0004] Therefore, developing an innovative cable-through water braid has become a key technical issue that needs to be urgently resolved in this field. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a new central cable-through water braid to solve the problem of deformation and damage of the cable-through connection caused by the eccentricity of the threaded connection during the screwing process of the drill pipe and the cable-through water braid.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] A central cable-through water braid, comprising a water braid shell, a water braid shaft and a rear joint shell, the two ends of the water braid shaft are respectively inserted into the rear joint shell and the water braid shell in the axial direction and are sealed and connected, and the water braid shaft is rotatably connected to the water braid shell, the rear joint shell is provided with a wiring head to connect an external cable, a cable plug is provided in the water braid shell away from the rear joint shell to connect to a cable socket in an external cable-through drill rod, and an external thread connected to the external cable-through drill rod is provided on the outside of the water braid shell, the water braid shaft is provided with a central cable, and the two ends of the central cable are respectively connected to the wiring head and the cable plug;

[0008] The cable plug has an expandable plug which deforms and shrinks radially under the action of an external force. The outer diameter of the expandable plug is larger than the inner diameter of the cable socket, and the expandable plug can be inserted into the cable socket after deforming and shrinking.

[0009] Furthermore, a waterway connector communicating with its inner cavity is provided on the outer side of the rear joint housing. Radial flow holes communicating with its inner cavity are provided at both ends of the water braid shaft, and the inner cavities of the rear joint housing and the water braid housing are communicated through the radial flow holes at both ends. The inner cavities of the rear joint housing and the water braid housing, the radial flow holes and the internal flow path of the water braid shaft cooperate to form an annular flow path.

[0010] Furthermore, the cable plug also has a cable plug body for connecting and fixing the central through-cable, and the expandable plug is arranged at one end of the cable plug body far from the central through-cable;

[0011] The end of the expandable plug is a hollow sphere, and the connecting section with the cable plug body is a hollow cylinder. The outer diameter of the hollow cylinder is smaller than the outer diameter of the hollow sphere, and the expandable plug is integrally divided into multiple segments in the radial direction so that the expandable plug can elastically deform and shrink in the radial direction under the action of an external force.

[0012] Furthermore, a cable connection seat is fixedly sleeved outside the cable plug, and there is a gap between the cable connection seat and the expandable plug to form an open cavity for accommodating the cable socket in the external through-cable drill pipe.

[0013] Furthermore, a support seat is fixedly sleeved outside the cable connection seat, and the support seat is in clearance connection with the water braid housing.

[0014] Furthermore, the central through-cable is a plug-in flexible wire.

[0015] Furthermore, the plug-in flexible wire includes a flexible wire and plugs connected to both ends of the flexible wire, and the two ends of the flexible wire are respectively connected to the wiring head and the cable plug through the plugs.

[0016] Furthermore, the plug adopts the structural form of an expandable plug.

[0017] Furthermore, a bearing is provided between the water braid shaft and the water braid housing to realize the rotational connection between the water braid shaft and the water braid housing.

[0018] Furthermore, a cable protective sleeve is provided on the outer side of the wiring head to protect the wiring head and the external cable connected to the wiring head.

[0019] The beneficial effects of the present utility model are as follows:

[0020] The utility model provides a central cable braid, which innovatively adopts a cable plug that can be radially deformed and reduced. The cable plug can automatically adjust its radial shape when inserted, solving the problem of cable plug insertion damage caused by the non-concentricity of the threaded connection during the screwing process between the cable plug, the drill pipe and the cable braid.

[0021] The central cable in the water braid is set as a deformable plug-in soft wire, which can offset the eccentric shaking caused by the rotation of the water braid, further improving the service life of the water braid.

[0022] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0024] Figure 1 This is a schematic structural diagram of a central cable-type water braid in an embodiment;

[0025] Figure 2 It is a schematic diagram of the structure of the plug-in cord in the embodiment.

[0026] Figure numerals: 1-cable protective sleeve; 2-connecting head; 3-rear joint housing; 4-water braid shaft; 5-bearing; 6-water braid housing; 7-support seat; 8-cable connecting seat; 9-cable plug; 10-plug-in flexible wire; 11-annular flow channel; 12-water channel joint; 101-plug; 102-flexible wire. DETAILED DESCRIPTION

[0027] The following describes the implementation of the present invention through specific examples. 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 implementations, 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. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0028] Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams rather than actual diagrams, and should not be construed as a limitation to the present utility model; in order to better illustrate the embodiments of the present utility model, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0029] In the attached drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation to the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] Please refer to Figures 1 to 2 , which is a central cable-through water braid, including a water braid housing 6, a water braid shaft 4, a rear joint housing 3, a waterway joint 12, a wiring head 2, a plug-in flexible wire 10, a cable plug 9, a cable connection seat 8, and a support seat 7. Both ends of the water braid shaft 4 are axially inserted into the rear joint housing 3 and the water braid housing 6 respectively and are hermetically connected, and the water braid shaft 4 is rotatably connected to the water braid housing 6;

[0031] A waterway joint 12 communicating with its inner cavity is provided on the outer side of the rear joint housing 3. Radial flow holes communicating with its inner cavity are provided at both ends of the water braid shaft 4, and the inner cavities of the rear joint housing 3 and the water braid housing 6 are communicated through the radial flow holes at both ends. The inner cavities of the rear joint housing 3 and the water braid housing 6, the radial flow holes, and the internal flow channel of the water braid shaft 4 cooperate to form an annulus flow channel 11. The annulus flow channel 11 communicates with the waterway joint 12 and the inner cavity of the external cable-through drill pipe, so that the drilling fluid flows in from the waterway joint 12, passes through the annulus flow channel 11, and is sent to the bottom of the hole, realizing the function of the cable-through water braid for transporting the drilling fluid.

[0032] Specifically, a sealing ring is provided at the sealing connection between the water braid shaft 4 and the water braid housing 6, so that the water braid shaft 4 and the water braid housing 6 still maintain a sealed connection when they rotate relative to each other.

[0033] The key point of this embodiment is that a terminal head 2 is provided at one end of the rear joint housing 3 away from the water braid housing 6 to connect an external cable. A plug-in flexible wire 10 serving as a central cable-passing is provided in the water braid shaft 4. A cable plug 9 is provided at one end of the water braid housing 6 away from the rear joint housing 3. The two ends of the plug-in flexible wire 10 are respectively connected to the terminal head 2 and the cable plug 9.

[0034] The cable plug 9 has a cable plug body for connecting the plug-in flexible wire 10 and an expandable plug at the top of the cable plug body (the end away from the plug-in flexible wire 10). The end of the expandable plug is a hollow sphere, and the end tail (the connection section with the cable plug body) is a hollow cylinder. The outer diameter of the hollow cylinder is smaller than the outer diameter of the hollow sphere, and the expandable plug is integrally divided into multiple segments in the radial direction so that the expandable plug can be elastically deformed and reduced in the radial direction under an external force, thereby having the ability of radial self-adaptive deformation.

[0035] Further, a cable connection seat 8 is fixedly sleeved outside the cable plug 9, and there is a gap between the cable connection seat 8 and the expandable plug to form an open cavity for accommodating the cable socket in the external cable-passing drill pipe.

[0036] A support seat 7 is fixedly sleeved outside the cable connection seat 8. The support seat 7 is in clearance connection with the water braid housing 6 so that the support seat 7 is rotationally connected to the water braid housing 6 on the basis of supporting the cable connection seat 8. The support seat 7 is provided with an axial through hole as a flow path for drilling fluid.

[0037] Further, a snap ring and an axial shoulder are respectively provided on both sides of the support seat 7 to achieve its axial positioning.

[0038] The plug-in flexible wire 10 includes a flexible wire 102 and plugs 101 connected to both ends of the flexible wire 102. The plugs 101 at both ends are respectively connected to the terminal head 2 and the cable plug 9, and the plugs 101 adopt the structure of expandable plugs, and their sizes are adaptively adjusted according to the sizes of the plugs 101.

[0039] Specifically, the cable socket in the external cable-passing drill pipe matches the expandable plug, its inner diameter is smaller than the outer diameter of the expandable plug, and the expandable plug can be inserted into the cable socket after being deformed and reduced; preferably, the inner diameter of the cable socket is smaller than the outer diameter of the hollow sphere and larger than the outer diameter of the hollow cylinder.

[0040] Correspondingly, sockets matching the plugs 101 are also provided in the terminal head 2 and the cable plug 9.

[0041] A bearing 5 is provided between the water braid shaft 4 and the water braid housing 6 to achieve the rotational connection between the water braid shaft 4 and the water braid housing 6; a cable protection sleeve 1 is provided outside the connection head 2 to protect the connection head 2 and the external cable connected to the connection head 2.

[0042] Furthermore, an external thread for connecting an external through-cable drill pipe is provided on the water braid housing 6.

[0043] The working principle of the above-mentioned central through-cable water braid is as follows:

[0044] The through-cable water braid is connected to the external through-cable drill pipe: The internal thread of the drill pipe and the external thread of the through-cable water braid are screwed together. A cable socket is provided inside the drill pipe. The expandable plug in the cable pin 9 will deform and shrink to insert into the cable socket, so that the cable pin 9 is in close contact with the cable socket, thereby ensuring the stability of the connection.

[0045] Normal drilling: The water braid housing 6 rotates together with the external through-cable drill pipe, and the central through-cable and the water braid shaft 4 do not rotate. The drilling fluid flows in from the waterway joint 12, passes through the annular flow channel 11, and is sent to the bottom of the hole, realizing the function of the through-cable water braid to transport the drilling fluid.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A central cable type water braid, characterized in that: It comprises a water braid shell, a water braid shaft and a rear joint shell, the two ends of the water braid shaft are respectively inserted into the rear joint shell and the water braid shell along the axial direction and are sealed and connected, and the water braid shaft is rotatably connected to the water braid shell, a wiring head is provided in the rear joint shell to connect an external cable, a cable plug is provided in the water braid shell away from the rear joint shell to connect to a cable socket in an external cable drill rod, and an external thread connected to the external cable drill rod is provided on the outside of the water braid shell, a central cable is provided in the water braid shaft, and the two ends of the central cable are respectively connected to the wiring head and the cable plug; The cable plug has an expansion plug, which is deformed and shrunk radially under the action of external force, the outer diameter of the expansion plug is larger than the inner diameter of the cable socket, and the expansion plug can be inserted into the cable socket after deformation and shrinkage.

2. The central cable type water braid according to claim 1, characterized in that: A water channel joint connected to the inner cavity of the rear joint shell is provided on the outside of the rear joint shell, and radial flow holes connected to the inner cavity are provided at both ends of the water braid shaft, and the inner cavities of the rear joint shell and the water braid shell are connected through the radial flow holes at both ends. The inner cavities of the rear joint shell and the water braid shell, the radial flow holes and the internal flow channels of the water braid shaft cooperate to form an annular flow channel.

3. The central cable type water braid according to claim 1, characterized in that: The cable plug also has a cable plug body for connecting and fixing a central through cable, and the expansion plug is arranged at an end of the cable plug body away from the central through cable; The end of the expansion plug is a hollow sphere, and the connecting section with the cable plug body is a hollow cylinder. The outer diameter of the hollow cylinder is smaller than the outer diameter of the hollow sphere, and the expansion plug as a whole is divided into multiple sections along the radial direction, so that the expansion plug can be elastically deformed and reduced in the radial direction under the action of external force.

4. The central cable type water braid according to claim 3, characterized in that: A cable connection seat is arranged on the outer fixing sleeve of the cable plug, and a gap is provided between the cable connection seat and the expansion plug to form an open cavity for accommodating a cable socket in an external cable-passing drill rod.

5. The central cable type water braid according to claim 4, characterized in that: The outer fixing sleeve of the cable connection seat is provided with a support seat, and the support seat is gap-connected with the water braid shell.

6. The center-through cable type water braid according to claim 1, characterized in that: The central through cable is a plug-in cord.

7. The central cable type water braid according to claim 6, characterized in that: The plug-in cord comprises a cord and plugs connected to both ends of the cord, and the wiring head and the cable plug are respectively connected via the plugs at both ends.

8. The central cable type water braid according to claim 7, characterized in that: The plug adopts the structural form of an expansion plug.

9. The central cable type water braid according to claim 1, characterized in that: A bearing is provided between the water braid shaft and the water braid housing to realize the rotational connection between the water braid shaft and the water braid housing.

10. The central cable type water braid according to claim 1, characterized in that: A cable protection cover is arranged on the outside of the wiring head to protect the wiring head and the external cables connected with the wiring head.

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