Floating device for clamping shell type deep well drilling rig

Abstract

The utility model relates to the technical field of drilling equipment, and discloses a floating device for a clamping type deep well drilling rig, which comprises a connecting column, a floating sleeve is connected onto the connecting column, the other end of the floating sleeve is connected with an end cover, a floating core shaft is slidably connected in the floating sleeve, a hoop is arranged on the connecting column and the end cover in a surrounding manner, and the end cover is connected with the floating core shaft. The end, connected with the floating sleeve, of the connecting column is provided with a first flange plate, the end, connected with the floating sleeve, of the end cover is provided with a second flange plate, the end faces of the sides, away from the floating sleeve, of the first flange plate and the second flange plate are inclined, and the thickness of the outer side ends of the first flange plate and the second flange plate is smaller than that of the inner side ends of the first flange plate and the second flange plate. According to the device, the problem that when a drilling tool is lifted, the screw is prone to being damaged due to large stress is solved, the hoop is additionally arranged to clamp the connecting column and the end cover, the hoop is used for replacing the screw to bear axial force, damage is reduced, 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 a clamp-type deep well drilling rig. 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 201620797962.9 discloses a floating device for deep well drilling rigs, 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. However, the end cap and the floating sleeve are only fixedly connected by bolts. Under large forces, the bolts are very prone to stripping or even breaking, 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 highly reliable floating device for a clamp-type deep well drilling rig.

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

[0006] A floating device for a clamp-type deep well drilling rig includes a connecting column, a floating sleeve connected to the connecting column, an end cap connected to the other end of the floating sleeve, a floating mandrel slidably connected inside the floating sleeve, a clamping ring jointly surrounding the connecting column and the end cap, a flange one connecting the connecting column to the floating sleeve, and a flange two connecting the end cap to the floating sleeve, both flange one and flange two having inclined end faces away from the floating sleeve, the thickness of the outer end of flange one and flange two being less than the thickness of their inner end, and the clamping ring simultaneously engaging with the inclined surfaces of flange one and flange two.

[0007] The present invention is further configured such that: the clamp includes two semi-circular clamps, the cross-section of the semi-circular clamps is semi-circular, the two semi-circular clamps can be assembled into a complete ring structure, and a boss is provided on both axial end faces of the semi-circular clamps. The bosses extend toward the axis, and the end faces of the bosses facing the semi-circular clamps are set as inclined surfaces. The inclined surfaces of the bosses abut against the inclined surfaces of flange one or flange two.

[0008] The present invention is further configured such that: a fastening end is provided on each of the two radial end faces of the semi-circular hoop, the fastening ends of the two semi-circular hoops that are spliced ​​together are in contact with each other, and the two fastening ends that are in contact with each other are fixed by bolts.

[0009] The present invention is further configured such that: both flange one and flange two are connected to the floating sleeve by screws, and the screws are countersunk screws.

[0010] The present invention is further configured such that: a floating cavity is provided inside the floating sleeve, a spline groove is provided on the inner wall of the floating sleeve, the spline groove is provided inside the floating cavity, and a spline is provided on the outer wall of the floating mandrel, the spline sliding in the spline groove.

[0011] The advantages of this utility model are:

[0012] The flange end faces of the connecting column and end cap are changed to inclined surfaces, and the screws connecting the flange and the floating sleeve are set as countersunk screws. After assembly, additional clamps are added to the connecting column and end cap. The bosses at both ends of the clamps abut against the inclined surfaces of the flanges, so that when the drill bit is lifted upward, the axial force is applied to the bosses at both ends of the clamps, which reduces the stress on the screws, avoids screw damage, and improves reliability. 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 Figure 2 The enlarged view of part B shown;

[0016] Figure 4 This is a schematic diagram of the semi-ring hoop structure of this utility model;

[0017] In the diagram: 1. Connecting column; 11. Flange 1; 2. Floating sleeve; 21. Spline groove; 3. End cover; 31. Flange 2; 4. Floating mandrel; 41. Spline; 5. Screw; 6. Clamp; 61. Semi-ring clamp; 62. Boss; 63. Fastening end; 7. Floating cavity. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] Please see Figure 1-4 The present invention provides the following technical solution:

[0022] A floating device for a clamp-type deep well drilling rig includes a connecting column 1, a floating sleeve 2 connected to the connecting column 1, and an end cap 3 connected to the other end of the floating sleeve 2. The end of the connecting column 1 connected to the floating sleeve 2 is a flange 11, and the end of the end cap 3 connected to the floating sleeve 2 is a flange 31. Both flange 11 and flange 31 are connected to the floating sleeve 2 by screws 5, which are countersunk screws. The torque on the connecting column 1 is transmitted to the floating sleeve 2 and the end cap 3 through the screws 5.

[0023] The floating sleeve 2 is provided with a floating cavity 7, and a floating mandrel 4 is slidably connected inside the floating sleeve 2. A spline groove 21 is provided on the inner wall of the floating sleeve 2, and the spline groove 21 is located in the floating cavity 7. A spline 41 is provided on the outer wall of the floating mandrel 4, and the spline 41 slides in the spline groove 21. The torque on the floating sleeve 2 is transmitted to the floating mandrel 4 through the spline 41 and the spline groove 21. The floating mandrel 4 can slide axially in the floating cavity 7, thereby protecting the drill pipe thread.

[0024] The connecting column 1 and the end cap 3 are both surrounded by a clamp 6;

[0025] The clamp 6 includes two semi-circular clamps 61. The cross-section of the semi-circular clamp 61 is semi-circular. The two semi-circular clamps 61 can be assembled into a complete ring structure. Both axial end faces of the semi-circular clamp 61 are provided with bosses 62. The bosses 62 extend towards the axis, and the inward end face of the bosses 62 is set as a slope.

[0026] Both flange 11 and flange 2 31 have inclined ends on the side away from floating sleeve 2. The inclined surfaces of flange 11 and flange 2 31 correspond to the inclined surfaces of boss 62. After clamp 6 is installed, the inclined surfaces of the two bosses 62 abut against the inclined surfaces of the corresponding flange 11 or flange 2 31. That is, clamp 6 can directly press the connecting column 1 and end cap 3 together. When lifting the drill bit, the upward pulling force on the connecting column 1 and the downward resistance on the floating mandrel 4 are both applied to the inclined surfaces at both ends of clamp 6, thereby reducing the stress on screw 5, avoiding damage to screw 5, and improving the overall reliability of the device.

[0027] Both radial end faces of the semi-ring 61 are provided with fastening ends 63. The fastening ends 63 of the two semi-ring 61 are fitted together and fixed by bolts, so that the two semi-ring 61 press against each other to form a complete ring structure, thereby promoting the uniform distribution of force acting on the inclined surface of the boss 62 and reducing damage to the connection surface. Both flange 11 and flange 31 have a structure that is thin on the outside and thick on the inside, which facilitates the installation of the clamp 6.

[0028] Specifically, the flange end faces of the connecting column 1 and end cover 3 are changed to inclined surfaces, and the screws 5 connecting the flange and the floating sleeve 2 are set as countersunk screws. After assembly, an additional clamp 6 is added to the connecting column 1 and end cover 3. The bosses 62 at both ends of the clamp 6 abut against the inclined surfaces of the flange, so that when the drill bit is lifted upward, the axial force is applied to the bosses 62 at both ends of the clamp 6, which reduces the stress on the screws 5, avoids damage to the screws 5, and improves reliability.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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 a clamp-type deep well drilling rig, comprising a connecting column (1), characterized in that: A floating sleeve (2) is connected to the connecting column (1), and an end cap (3) is connected to the other end of the floating sleeve (2). A floating mandrel (4) is slidably connected inside the floating sleeve (2). A clamp (6) is provided together on the connecting column (1) and the end cap (3). One end of the connecting column (1) connected to the floating sleeve (2) is set as flange one (11), and one end of the end cap (3) connected to the floating sleeve (2) is set as flange two (31). The side faces of flange one (11) and flange two (31) away from the floating sleeve (2) are both set as inclined. The thickness of the outer end of flange one (11) and flange two (31) is less than the thickness of its inner end. The clamp (6) is simultaneously engaged with the inclined surfaces of flange one (11) and flange two (31).

2. The floating device for a clamp-type deep well drilling rig according to claim 1, characterized in that: The clamp (6) includes two semi-circular clamps (61). The cross-section of the semi-circular clamp (61) is semi-circular. The two semi-circular clamps (61) can be assembled into a complete ring structure. A boss (62) is provided on both axial end faces of the semi-circular clamp (61). The boss (62) extends towards the axis. The end face of the boss (62) facing the semi-circular clamp (61) is set as an inclined surface. The inclined surface of the boss (62) abuts against the inclined surface of flange one (11) or flange two (31).

3. The floating device for a clamp-type deep well drilling rig according to claim 2, characterized in that: The two radial end faces of the semi-circular hoop (61) are provided with fastening ends (63), and the fastening ends (63) of the two semi-circular hoops (61) that are spliced ​​together are in contact with each other, and the two fastening ends (63) that are in contact with each other are fixed by bolts.

4. The floating device for a clamp-type deep well drilling rig according to claim 1, characterized in that: The flange one (11) and flange two (31) are connected to the floating sleeve (2) by screws (5), and the screws (5) are countersunk screws.

5. A floating device for a clamp-type deep well drilling rig according to claim 1, characterized in that: The floating sleeve (2) is provided with a floating cavity (7), and a spline groove (21) is provided on the inner wall of the floating sleeve (2). The spline groove (21) is provided in the floating cavity (7), and a spline (41) is provided on the outer wall of the floating mandrel (4). The spline (41) slides in the spline groove (21).

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