Floating device for protecting threads for deep well drilling rig

Abstract

The utility model relates to the technical field of well drilling equipment, and discloses a thread protection floating device for a deep well drilling rig, which comprises a floating sleeve, a plurality of inner convex blocks are uniformly arranged on the inner wall of a sleeve of the floating sleeve along the same circumferential direction, a floating cavity is arranged between the bottom of the sleeve and the inner convex blocks, a floating mandrel is slidably connected in the sleeve, and the inner convex blocks are arranged in the floating cavity. A plurality of outer protruding blocks are evenly arranged on the floating mandrel, the outer protruding blocks and the inner protruding blocks are arranged in a staggered mode, the outer protruding blocks comprise longitudinal blocks and transverse blocks, the longitudinal blocks extend in the axial direction, the transverse blocks extend in the circumferential direction, the transverse blocks are arranged in the floating cavity, and the transverse blocks can abut against the inner protruding blocks correspondingly. According to the device, the problem that a connecting bolt is prone to breakage due to the fact that stress is large is solved, pulling force and torque are provided through mutual clamping of the inner protruding block and the outer protruding block, and reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of drilling equipment technology, and more specifically, it relates to a floating device for protecting threads for deep well drilling rigs. Background Technology

[0002] Deep well drilling rigs are mechanical devices used in exploration or mineral resource development to drive drill strings underground and obtain physical geological data. In actual use, the drill strings often need to penetrate to depths of hundreds or even thousands of meters. To protect the drill pipe threads, a floating device is installed on the drill string. This floating device also bears the axial loads, drilling torque, and drilling fluid pressure brought about by drilling operations, as well as eliminating the impact of drill string vibration on the power head. Therefore, the overall structural strength and connection strength of the floating device are particularly important in the equipment.

[0003] Chinese utility model patent application number 201420254207.7 discloses a floating head device and a deep well drilling rig, which is a commonly used structure on the market. Its floating sleeve and end cap form a floating cavity, and the floating core tube can slide axially in the floating sleeve. The floating core tube is connected to the floating sleeve through a spline structure, so that it has a certain displacement margin while transmitting torque. When the drill bit is lifted from the ground, the floating core tube and the drill bit on it are pulled upward by the end cap. That is, the upward pulling force of the drill rod and the downward gravity and friction of the drill bit are all acting on the end cap. The end cap and the floating sleeve are only fixedly connected by bolts. Under large forces, the bolts are very easy to strip or even break, which can lead to safety accidents. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a floating device for protecting the threads of deep well drilling rigs that is not easily damaged.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A floating device for protecting threads in deep well drilling rigs includes a floating sleeve. A plurality of inner protrusions are provided on the inner wall of the sleeve, evenly distributed along the same circumference. A floating cavity exists between the bottom of the sleeve and the inner protrusions. A floating mandrel is slidably connected inside the sleeve. A plurality of outer protrusions are evenly distributed on the outer wall of the floating mandrel, alternating with the inner protrusions. Each outer protrusion includes a longitudinal block and a transverse block. The longitudinal block extends axially along the floating mandrel, and the transverse block extends circumferentially along the floating mandrel. The transverse block is located within the floating cavity and can abut against the inner protrusions. A limiting floating key is provided between the longitudinal block and the inner protrusions. The longitudinal block, inner protrusions, and limiting floating key together form a complete annular shape.

[0007] The present invention is further configured such that: the end face of the transverse block facing the inner protrusion is inclined, and the inner protrusion facing the transverse block is configured with a corresponding inclined surface, and the transverse block can abut against the inclined surface of the inner protrusion.

[0008] The present invention is further configured such that: the outer protrusion is slidably connected to the inner wall of the sleeve, and the minimum length between adjacent inner protrusions is not less than the circumferential length of the transverse block.

[0009] The present invention is further configured such that the limiting floating key block is fixed inside the sleeve by a countersunk screw, and the countersunk screw is arranged radially along the sleeve.

[0010] The present invention is further configured such that: a buffer pad is provided at the bottom of the sleeve, an end cap is provided at the open end of the sleeve, the end cap is fixed to the sleeve by a number of connecting screws, the floating mandrel is slidably connected to the end cap, and a number of sealing rings are provided on the sliding connection surfaces of the floating mandrel, the end cap, and the sleeve.

[0011] The advantages of this utility model are:

[0012] The inner wall of the floating sleeve is uniformly provided with several inner protrusions, and the outer wall of the floating mandrel is correspondingly provided with several outer protrusions. The outer protrusions include longitudinal blocks and transverse blocks. The longitudinal blocks are arranged axially, and the transverse blocks extend circumferentially along the floating mandrel. The longitudinal blocks and inner protrusions are limited and fixed by the limiting floating key blocks. When the drill rod rotates, the floating sleeve transmits torque to the floating mandrel through the limiting floating key blocks and the longitudinal blocks. When the drill rod is pulled up, the inner protrusions and transverse blocks abut against each other, thereby pulling the floating mandrel and the drill tool on it through the transverse blocks. The screws in the device do not bear additional force. The transmission of torque and tension is achieved through the interlocking of the protrusion structures on the parts, thereby improving the reliability of the device and avoiding safety hazards. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of one embodiment of the present invention;

[0014] Figure 2 For along Figure 1 The cross-sectional view along line AA is shown below;

[0015] Figure 3 For along Figure 1 The BB line cross-section shown;

[0016] Figure 4 This is a schematic diagram of the floating sleeve structure of this utility model;

[0017] Figure 5 for Figure 4 The left view shown;

[0018] Figure 6 This is a schematic diagram of the floating mandrel structure of this utility model;

[0019] Figure 7 for Figure 6 The right view shown;

[0020] In the diagram: 1. Floating sleeve; 11. Sleeve; 12. Inner protrusion; 2. Floating spindle; 21. Shaft body; 22. Outer protrusion; 221. Longitudinal block; 222. Transverse block; 3. Limiting floating key block; 31. Countersunk screw; 4. End cap; 5. Buffer pad; 6. Floating cavity; 7. Connecting screw. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0024] Please see Figure 1-7 The present invention provides the following technical solution:

[0025] A floating device for protecting threads of a deep well drilling rig includes a floating sleeve 1. A plurality of inner protrusions 12 are provided on the inner wall of the sleeve 11 of the floating sleeve 1. The plurality of inner protrusions 12 are evenly distributed along the same circumference. The bottom of the sleeve 11 and the inner protrusions 12 form a floating cavity 6.

[0026] A floating mandrel 2 is slidably connected inside the sleeve 11. A plurality of external protrusions 22 are evenly arranged on the outer wall of the floating mandrel 2. The external protrusions 22 are staggered with the internal protrusions 12. The external protrusions 22 include longitudinal blocks 221 and transverse blocks 222. The longitudinal blocks 221 extend along the axial direction of the floating mandrel 2, and the transverse blocks 222 extend along the circumferential direction of the floating mandrel 2. The transverse blocks 222 are inside the floating cavity 6 and can abut against the corresponding internal protrusions 12.

[0027] One side of the longitudinal block 221 abuts against the inner protrusion 12, and the other side of the longitudinal block 221 is provided with a limiting floating key block 3 between it and the adjacent inner protrusion 12. The limiting floating key block 3 is fixed in the sleeve 11 by a countersunk screw 31. That is, all the longitudinal blocks 221, inner protrusions 12 and limiting floating key blocks 3 can form a complete ring shape together. The longitudinal block 221, inner protrusions 12 and limiting floating key blocks 3 are all slidably connected.

[0028] When the drill string sinks, the top of the floating mandrel 2 connects with the bottom of the sleeve 11, and the drill rod pushes the floating mandrel 2 and the drill string on it downward through the floating sleeve 1.

[0029] All the longitudinal blocks 221, the inner protrusion 12, and the limiting floating key block 3 form a spline structure. When the drill rod rotates, the floating sleeve 1 transmits the torque to the floating mandrel 2 through this spline structure.

[0030] When the drill pipe is lifted, the floating sleeve 1 moves upward, while the drill bit pulls the floating mandrel 2 downward due to its own weight and friction until the lower surface of the transverse block 222 abuts against the upper surface of the inner protrusion 12. At this time, the inner protrusion 12 pulls the floating mandrel 2 upward through the abutting surface, thus completing the lifting of the drill bit.

[0031] This application achieves the transmission of torque and tension through the cooperation of the inner protrusion 12, the outer protrusion 22, and the limiting floating key block 3, instead of using additional connecting parts, thereby avoiding damage to the device during use and improving the overall reliability.

[0032] It is worth mentioning that the external protrusion 22 of this application includes a longitudinal block 221 and a transverse block 222. The longitudinal block 221 is responsible for transmitting torque, and the transverse block 222 is responsible for transmitting tensile force, thereby replacing the role of bolts in the prior art. The applicant believes that regardless of the connection relationship between the longitudinal block 221 and the transverse block 222, such as the two being in the shape of a "7", "T" or "+", or the two not being in contact, these are all conventional replacement methods in the field. Any snap-fit ​​structure that can realize the transmission of torque and tensile force should be included within the protection scope of this application.

[0033] The bottom of the sleeve 11 is provided with a buffer pad 5, and the open end of the sleeve 11 is provided with an end cap 4. The end cap 4 is fixed to the sleeve 11 by several connecting screws 7. The floating spindle 2 is slidably connected to the end cap 4. Several sealing rings are provided on the sliding connection surfaces of the floating spindle 2, the end cap 4, and the sleeve 11.

[0034] The outer protrusion 22 is slidably connected to the inner wall of the sleeve 11, and the minimum length between adjacent inner protrusions 12 is not less than the circumferential length of the transverse block 22, so as to facilitate the assembly of the floating mandrel 2.

[0035] Preferably, the lower end face of the transverse block 222 is set as an inclined surface, and the upper end face of the inner protrusion 12 is set as an inclined surface corresponding to the transverse block 222. The contact surface between the transverse block 222 and the inner protrusion 12 is set as an inclined surface, which increases the contact area between the two, reduces the stress between the protrusion and the shaft caused by lifting, and has a more stable lifting effect.

[0036] Specifically, a plurality of inner protrusions 12 are evenly arranged on the inner wall of the floating sleeve 1, and a plurality of outer protrusions 22 are correspondingly arranged on the outer wall of the floating mandrel 2. The outer protrusions 22 include longitudinal blocks 221 and transverse blocks 222. The longitudinal blocks 221 are arranged axially, and the transverse blocks 222 extend circumferentially along the floating mandrel 2. The longitudinal blocks 221 and the inner protrusions 12 are limited and fixed by the limiting floating key block 3. When the drill rod rotates, the floating sleeve 1 transmits torque to the floating mandrel 2 through the limiting floating key block 3 and the longitudinal blocks 221. When the drill rod is pulled up, the inner protrusions 12 abut against the transverse blocks 222, thereby pulling the floating mandrel 2 and the drill tool on it through the transverse blocks 222. The screws in the device do not bear additional force. The transmission of torque and tension is achieved by the interlocking of the protrusion structures on the parts, thereby improving the reliability of the device and avoiding safety hazards.

[0037] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar counterparts and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A floating device for protecting threads of a deep well drilling rig, comprising a floating sleeve (1), characterized in that: The inner wall of the sleeve (11) of the floating sleeve (1) is provided with a plurality of inner protrusions (12), which are evenly distributed along the same circumference. The bottom of the sleeve (11) and the inner protrusions (12) form a floating cavity (6). A floating mandrel (2) is slidably connected inside the sleeve (11). A plurality of outer protrusions (22) are evenly provided on the outer wall of the floating mandrel (2), which are staggered with the inner protrusions (12). The outer protrusions (22) include a longitudinal block (221) and a longitudinal block (221). The transverse block (222) extends along the axial direction of the floating mandrel (2) and the longitudinal block (221) extends along the circumferential direction of the floating mandrel (2). The transverse block (222) is inside the floating cavity (6). The transverse block (222) can abut against the inner protrusion (12). A limiting floating key block (3) is provided between the longitudinal block (221) and the inner protrusion (12). Several longitudinal blocks (221), inner protrusions (12) and limiting floating key blocks (3) together form a complete ring shape.

2. The floating device for protecting threads of a deep well drilling rig according to claim 1, characterized in that: The end face of the transverse block (222) facing the inner protrusion (12) is inclined, and the inner protrusion (12) facing the transverse block (222) is set as a corresponding inclined surface. The transverse block (222) can abut against the inclined surface of the inner protrusion (12).

3. The floating device for protecting threads of a deep well drilling rig according to claim 1, characterized in that: The outer protrusion (22) is slidably connected to the inner wall of the sleeve (11), and the minimum length between adjacent inner protrusions (12) is not less than the circumferential length of the transverse block (222).

4. The floating device for protecting threads of a deep well drilling rig according to claim 1, characterized in that: The limiting floating key block (3) is fixed inside the sleeve (11) by countersunk screws (31), which are arranged radially along the sleeve (11).

5. A floating device for protecting threads in a deep well drilling rig according to claim 1, characterized in that: The bottom of the sleeve (11) is provided with a buffer pad (5), and the open end of the sleeve (11) is provided with an end cap (4). The end cap (4) is fixed to the sleeve (11) by several connecting screws (7). The floating spindle (2) is slidably connected to the end cap (4). Several sealing rings are provided on the sliding connection surfaces of the floating spindle (2), the end cap (4), and the sleeve (11).

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