Casing pipe outer clamping device for top drive casing pipe running

Abstract

The utility model discloses a casing pipe outer clamping device for a top drive lower casing pipe, which comprises a positioning cylinder and an outer clamping mechanism arranged on the positioning cylinder, an extension ring is welded at the center of the outer wall of the positioning cylinder, four servo motors are fixed on the extension ring, inner grooves are respectively formed on four sides of the inner wall of the positioning cylinder, and the outer clamping mechanism is fixed on the inner wall of the positioning cylinder. Output shafts of the four servo motors are coaxially connected with screw rods correspondingly, the four screw rods are sleeved with sliding plates correspondingly in a threaded mode, the four sliding plates are attached to the inner walls of the four inner grooves correspondingly, so that the sliding plates can be driven to move horizontally along the inner walls of the inner grooves when the screw rods operate, pulleys are installed on the four sliding plates correspondingly, and the sliding plates are driven by the pulleys to move horizontally along the inner walls of the inner grooves; four storage grooves are further formed in the inner wall of the positioning cylinder, and the outer clamping mechanism comprises hydraulic telescopic rods horizontally installed in the four storage grooves correspondingly and side positioning blocks welded to the four hydraulic telescopic rods correspondingly. According to the outer sleeve clamping device for the top drive lower sleeve, the sleeve sinks along with the four pulleys, friction is reduced, and therefore abrasion to the outer wall of the sleeve is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of casing lowering operation, and particularly relates to a casing outer clamping device for top drive casing lowering. Background Art

[0002] Casing operation refers to the operation of connecting casings one by one into the well when cementing is required after the well is drilled to the predetermined depth. Casings are divided into guide casing, surface casing, technical casing, production casing / oil layer casing and perforation section according to the different stages and depths of casing.

[0003] In the process of realizing the utility model, the inventors found that there are at least the following problems in this technology: when the casing is lowered, an external clamping device is required to position the casing and slowly lower it to complete the installation of the casing; but the current external clamping device usually relies entirely on the friction between the casing and the fixed structure on the external clamping device when the casing is lowered (sinked) (because the fixed structure is required to make the casing slide vertically downward in a limited manner), resulting in relatively severe wear on the outer wall of the casing.

[0004] Therefore, we propose a casing outer clamping device for top drive casing to solve the above problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a casing outer clamping device for top drive casing, so that the four pulleys in the positioning cylinder are in contact with the casing, so that the casing sinks along with the four pulleys, reducing friction, thereby reducing the wear on the outer wall of the casing, and can effectively solve the problems in the background technology.

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

[0007] A casing external clamping device for top drive casing, comprising a positioning cylinder and an external clamping mechanism installed on the positioning cylinder, an extension ring is welded at the center of the outer wall of the positioning cylinder, four servo motors are fixed on the extension ring, the servo motors need to be powered by external power facilities, inner grooves are formed on four sides of the inner wall of the positioning cylinder, the output shafts of the four servo motors are coaxially connected with screws, slide plates are threadedly sleeved on the four screws, and the four slide plates are respectively fitted with the inner walls of the four inner grooves, so that the screws can drive the slide plates to translate along the inner walls of the inner grooves when they are running, and pulleys are respectively installed on the four slide plates;

[0008] Four receiving grooves are also formed on the inner wall of the positioning cylinder, and the external clamping mechanism includes hydraulic telescopic rods respectively installed horizontally in the four receiving grooves and side positioning blocks respectively welded to the four hydraulic telescopic rods.

[0009] As a preferred embodiment, external fixing rings are symmetrically welded on both sides of the outer wall of the positioning cylinder, wherein each of the four corners of the external fixing ring has protruding ear corners; screw holes are tapped on the ear corners for installing bolts, so that the positioning cylinder can be connected to external equipment with the help of the ear corners, thereby ensuring the structural stability of the positioning cylinder and the external clamping mechanism.

[0010] As a preferred embodiment, four side grooves are formed on the outer wall of the extension ring, and four servo motors are horizontally installed in the four side grooves respectively; the four servo motors are distributed in a circular array along the central axis of the extension ring.

[0011] As a preferred embodiment, the four screws are all arranged horizontally and are located in four inner grooves respectively, and the four screws are all rotatably connected to the positioning cylinder, so that the four screws can operate stably.

[0012] As a preferred embodiment, the four side positioning blocks are distributed in a circular array along the central axis of the positioning tube, and the four side positioning blocks are respectively fitted with the inner walls of the four receiving grooves; so that the four side positioning blocks can work together to position the sleeve.

[0013] In summary, the technical effects and advantages of the utility model are as follows:

[0014] The casing outer clamping device used for the top drive casing sinking, when the casing is needed, makes the four pulleys in the positioning tube contact with the casing, so that the casing sinks along with the four pulleys, reducing friction, thereby reducing the wear on the outer wall of the casing; when the casing needs to be fixed, makes the four side positioning blocks contact with the casing and separates the pulley from the casing to ensure friction; in this way, the stability of the casing can be ensured, and the probability of friction damage during the sinking process can be reduced;

[0015] The casing outer clamping device for the top drive casing sinking, when the casing needs to be sunk, drives four servo motors to operate and drive four screws to operate, so that the four slides are translated in the four inner grooves respectively, so that the four pulleys finally contact the outer wall of the casing, and then the four hydraulic telescopic rods are synchronously and slowly contracted, so that the side positioning blocks are slightly separated from the casing, and the casing slowly sinks under the action of its own gravity, and the wheels on the four pulleys are driven to roll when the casing sinks, thereby avoiding the casing from sinking completely with the help of the friction force of the side positioning blocks, and relying on a part of the rolling friction force, thereby reducing the wear on the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a top view of the utility model;

[0018] Figure 3 A vertical cross-sectional view of one side of the utility model;

[0019] Figure 4 For this utility model Figure 3 A magnified view of the structure at center;

[0020] Figure 5 It is a vertical cross-sectional view of the other side of the utility model.

[0021] In the figure: 1. positioning cylinder; 2. external fixing ring; 3. ear angle; 4. extension ring; 5. side groove; 6. servo motor; 7. inner groove; 8. screw; 9. slide plate; 10. pulley; 11. storage groove; 12. hydraulic telescopic rod; 13. side positioning block; 14. external clamping mechanism. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Reference Figure 1-Figure 5 A casing external clamping device for a top drive casing includes a positioning tube 1 and an external clamping mechanism 14 installed on the positioning tube 1. External fixing rings 2 are symmetrically welded on both sides of the outer wall of the positioning tube 1, wherein ear angles 3 are protruding from the four corners of each external fixing ring 2, and screw holes are tapped on the ear angles 3 for installing bolts, so that the positioning tube 1 can be connected with external equipment by means of the ear angles 3, thereby ensuring the structural stability of the positioning tube 1 and the external clamping mechanism 14;

[0024] An extension ring 4 is welded at the center of the outer wall of the positioning cylinder 1, and four servo motors 6 are fixed on the extension ring 4. The servo motors 6 need to be powered by external power facilities. Four side grooves 5 are formed on the outer wall of the extension ring 4, and the four servo motors 6 are horizontally installed in the four side grooves 5 respectively. The four servo motors 6 are distributed in a circular array along the central axis of the extension ring 4;

[0025] Inner grooves 7 are formed on four sides of the inner wall of the positioning cylinder 1, and the output shafts of the four servo motors 6 are coaxially connected with screw rods 8, which are all horizontally arranged and respectively located in the four inner grooves 7. The four screw rods 8 are rotatably connected to the positioning cylinder 1, so that the four screw rods 8 can operate stably. Slide plates 9 are respectively threadedly sleeved on the four screw rods 8, and the four slide plates 9 are respectively fitted with the inner walls of the four inner grooves 7, so that the screw rods 8 can drive the slide plates 9 to translate along the inner wall of the inner groove 7 when they are running, and pulleys 10 are respectively installed on the four slide plates 9;

[0026] Four receiving grooves 11 are also formed on the inner wall of the positioning cylinder 1. The external clamping mechanism 14 includes hydraulic telescopic rods 12 horizontally installed in the four receiving grooves 11 and side positioning blocks 13 welded to the four hydraulic telescopic rods 12. The four side positioning blocks 13 are distributed in a circular array along the central axis of the positioning cylinder 1, and the four side positioning blocks 13 are respectively fitted with the inner walls of the four receiving grooves 11, so that the four side positioning blocks 13 can work together to position the sleeve.

[0027] The casing external clamping device for the top drive casing: when installing, bolts are installed on the ear angles 3 on the two external fixing rings 2, and the bolts are inserted into the external device for fixing the positioning tube 1, so that the positioning tube 1 and the external clamping mechanism 14 can be fixed on the device, so that the positioning tube 1 and the external clamping mechanism 14 are kept stable;

[0028] When in use, the sleeve is inserted from the opening at the top of the positioning tube 1 to the height of the four side positioning blocks 13, and the four hydraulic telescopic rods 12 are driven to run and drive the four side positioning blocks 13 to extend from the four receiving grooves 11 respectively and contact with the outer wall of the sleeve, so that the sleeve is clamped in the positioning tube 1 by friction; when the sleeve needs to sink, the four servo motors 6 are first driven to run and drive the four screws 8 to operate, so that the four slides 9 are translated in the four inner grooves 7 respectively, so that the four pulleys 10 finally contact with the outer wall of the sleeve, and then the four hydraulic telescopic rods 12 are synchronously and slowly contracted, so that the side positioning blocks 13 are slightly separated from the sleeve (but not completely separated). At this time, the sleeve slowly sinks under the action of its own gravity, and when the sleeve sinks, it drives the wheels on the four pulleys 10 to roll, thereby avoiding the sleeve from sinking completely with the help of the friction of the side positioning blocks 13, but with the help of a part of the rolling friction, thereby reducing the wear on the sleeve.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A casing external clamping device for top drive casing, comprising a positioning tube (1) and an external clamping mechanism (14) mounted on the positioning tube (1), characterized in that: An extension ring (4) is welded at the center of the outer wall of the positioning cylinder (1), and four servo motors (6) are fixed on the extension ring (4). Four sides of the inner wall of the positioning cylinder (1) are respectively formed with inner grooves (7), and the output shafts of the four servo motors (6) are respectively coaxially connected with screw rods (8), and slide plates (9) are respectively threadedly sleeved on the four screw rods (8), and the four slide plates (9) are respectively fitted with the inner walls of the four inner grooves (7), and pulleys (10) are respectively installed on the four slide plates (9); The inner wall of the positioning cylinder (1) is also formed with four receiving grooves (11), and the external clamping mechanism (14) comprises hydraulic telescopic rods (12) respectively installed horizontally in the four receiving grooves (11) and side positioning blocks (13) respectively welded to the four hydraulic telescopic rods (12).

2. The casing outer clamping device for top drive casing according to claim 1, characterized in that: External fixing rings (2) are symmetrically welded on both sides of the outer wall of the positioning cylinder (1), wherein ear corners (3) are protruding from the four corners of each of the external fixing rings (2).

3. The casing outer clamping device for top drive casing according to claim 1, characterized in that: The outer wall of the extension ring (4) is formed with four side grooves (5), and the four servo motors (6) are respectively installed horizontally in the four side grooves (5).

4. The casing outer clamping device for top drive casing according to claim 1, characterized in that: The four screw rods (8) are all arranged horizontally and are respectively located in the four inner grooves (7), and the four screw rods (8) are all rotatably connected to the positioning cylinder (1).

5. The casing outer clamping device for top drive casing according to claim 1, characterized in that: The four side positioning blocks (13) are distributed in a circular array along the central axis of the positioning cylinder (1), and the four side positioning blocks (13) are respectively fitted with the inner walls of the four receiving grooves (11).

Images