Sleeve centralizer limiting device

Abstract

The utility model relates to a casing centralizer limiting device, and relates to the technical field of well drilling. The casing centralizer limiting device comprises a first hoop body and a second hoop body which are both semicircular, the first end of the first hoop body is connected with the first end of the second hoop body through a hinge seat, a rope is arranged on the hinge seat, a magnet is arranged at the end, away from the hinge seat, of the rope, and a movable buckle is arranged at the second end of the first hoop body. The second end of the second hoop body is provided with a connecting base detachably connected with the movable buckle, the inner side of the first hoop body and the inner side of the second hoop body are each provided with an arc-shaped groove, and an elastic cushion used for surrounding the outer wall of the casing pipe is arranged in each arc-shaped groove. After the first hoop body and the second hoop body are connected through the movable buckle and the connecting base, the elastic cushion arranged in the arc-shaped groove is tightly attached to the outer wall of a casing pipe, so that the hoop body is fixed to the outer wall of the casing pipe, a centralizer on the casing pipe is supported and limited, the centralizer is prevented from falling to interfere with screwing-on and screwing-off operation of the casing pipe, and the hoop is simple in structure and easy to carry and operate.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling, in particular to a casing centralizer limiting device. Background Art

[0002] Casing centralizer, also known as casing positioner, is a device specially used to ensure the stability of oil well casing. During the oil drilling process, casing, as a key component connecting the wellhead and the oil layer, may tilt, twist or displace due to changes in geological conditions or the impact of drilling operations. These problems will cause the stability of the oil well to be damaged, thereby affecting the oil production effect. In order to solve these problems, casing centralizers are usually used to ensure the stability of the casing, thereby ensuring the smooth progress of oil production.

[0003] A Chinese patent with publication number CN102434115A discloses a strong cyclone casing straightener, in which the straightening cylinder body can rotate and slide on the outer wall of the casing body, thereby reducing the friction resistance between the casing and the well wall during the casing entering the well. Since the straightener can slide on the casing, the sliding straightener will cause adverse effects during the operation of putting on and taking off the casing. The conventional operation relies on a single construction worker to manually lift the straightener to a certain height on the casing. This height needs to reserve the distance for putting on and taking off the hydraulic clamps, and then other construction workers use hydraulic clamps to tighten the casing for putting on and taking off the buckles. However, the above operation has certain safety hazards and is labor-intensive. Utility Model Content

[0004] The utility model provides a limiting device for a casing centralizer, which can limit the centralizer to prevent it from sliding down, reduce labor intensity and improve safety.

[0005] The utility model provides a casing straightener limiting device, comprising a first hoop body and a second hoop body, both of which are semicircular, wherein the first end of the first hoop body is connected to the first end of the second hoop body via a hinge seat, a rope is provided on the hinge seat, a magnet is provided at the end of the rope away from the hinge seat, an active buckle is provided at the second end of the first hoop body, and a connecting seat detachably connected to the active buckle is provided at the second end of the second hoop body, an arc groove is provided on the inner side of the first hoop body and the inner side of the second hoop body, and an elastic pad for hugging the outer wall of the casing is provided in the arc groove.

[0006] In one embodiment, the movable buckle includes a fixed seat, a handle and a hook, the fixed seat is fixed to the second end of the first hoop body, one end of the handle is hinged to the fixed seat, and one end of the hook is rotatably arranged on the handle and detachably connected to the connecting seat.

[0007] In one embodiment, a limiting protrusion is provided on a side of the connecting seat away from the movable buckle.

[0008] In one embodiment, the hook includes a hook body and two positioning posts arranged at one end of the hook body, the two positioning posts are arranged opposite to each other and spaced apart, and a positioning hole for inserting the positioning posts is provided on the handle.

[0009] In one embodiment, the hook body includes an extending portion and a connecting portion, and two ends of the extending portion are respectively connected to the positioning column and one end of the connecting portion.

[0010] In one embodiment, the extension portion includes a first segment and a second segment connected at an angle, an end of the first segment away from the second segment is connected to the positioning column, and an end of the second segment away from the first segment is connected to the connecting portion.

[0011] In one embodiment, the elastic pad protrudes from the arc-shaped groove.

[0012] In one embodiment, the elastic pad includes a base pad and two side pads arranged on the base pad, the base pad is arranged at the bottom of the arc-shaped groove, the side pads are arranged at the groove wall of the arc-shaped groove, the first end of the side pad is connected to the base pad, and the second end of the side pad protrudes from the arc-shaped groove.

[0013] In one embodiment, a distance between the second ends of the two side pads is greater than a distance between the first ends of the two side pads.

[0014] In one embodiment, the elastic pad is made of rubber.

[0015] Compared with the prior art, the utility model has the advantages that after the first hoop body and the second hoop body are connected by the movable buckle and the connecting seat, the elastic pad arranged in the arc groove is close to the outer wall of the casing, so as to be fixed on the outer wall of the casing, providing support and limit for the centralizer on the casing, preventing the centralizer from sliding down and interfering with the buckle-on and buckle-off operations of the casing, and having a simple structure, easy to carry and operate, replacing manual lifting of the centralizer, improving operation safety and reducing labor intensity. The casing centralizer limiter can be suspended on the outer wall of the casing by magnets and ropes, providing assistance for the installation and disassembly process, and preventing the casing centralizer limiter from accidentally falling during the loading and unloading process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0017] Figure 1 It is one of the structural schematic diagrams of the casing centralizer limiting device in the embodiment of the utility model;

[0018] Figure 2 This is the second structural schematic diagram of the casing centralizer limiting device in the embodiment of the utility model;

[0019] Figure 3 yes Figure 1 Middle AA section view;

[0020] Figure 4 yes Figure 2 The enlarged view of point B in the middle;

[0021] Figure 5 It is a front view of the hook in the embodiment of the utility model.

[0022] Reference numerals:

[0023] 1. First hoop body; 2. Second hoop body; 3. Articulated seat; 4. Rope; 5. Magnet; 6. Movable buckle; 61. Fixed seat; 62. Handle; 63. Hook; 631. Hook body; 6311. Extension part; 63111. First section; 63112. Second section; 6312. Connecting part; 632. Positioning column; 7. Connecting seat; 71. Limiting protrusion; 8. Elastic pad; 81. Bottom pad; 82. Side pad; 100. Arc groove. DETAILED DESCRIPTION

[0024] The utility model will be further described below in conjunction with the accompanying drawings.

[0025] Since the centralizer can slide on the casing, the sliding centralizer will cause adverse effects during the operation of putting on and breaking off the casing. The conventional operation is to rely on a single construction worker to lift the centralizer to a certain height on the casing by hand. This height needs to reserve the distance for putting on and breaking off the hydraulic clamp, and then other construction workers use hydraulic clamps to tighten the casing for putting on and breaking off the buckle. The disadvantages of the above operation are: first, the construction worker who holds the casing centralizer by hand needs to hold the centralizer high during the process of putting on and breaking off the buckle. At this time, if the hydraulic clamp operator accidentally misoperates, it is likely to cause the person holding the centralizer by hand to be squeezed or bruised; second, if the construction worker holding the casing centralizer by hand lets go due to fatigue or other reasons, the casing centralizer will slide down to the hydraulic clamp due to gravity, causing the centralizer and the hydraulic clamp to be squeezed, and even damage the equipment, thereby affecting the speed of the casing lowering operation; third, the person holding the casing centralizer by hand must stand at the wellhead to work, which is in a dangerous area and cannot respond to emergencies in a timely manner, which poses certain personal safety hazards.

[0026] In order to solve the adverse effects of the existing artificial lifting and straightening devices, such as Figures 1 to 3As shown, a casing straightener limiting device of an embodiment of the utility model comprises a first hoop body 1 and a second hoop body 2, both of which are semicircular, a first end of the first hoop body 1 is connected to a first end of the second hoop body 2 via a hinge seat 3, a rope 4 is provided on the hinge seat 3, a magnet 5 is provided at one end of the rope 4 away from the hinge seat 3, a movable buckle 6 is provided at the second end of the first hoop body 1, a connecting seat 7 detachably connected to the movable buckle 6 is provided at the second end of the second hoop body 2, an arc groove 100 is provided on the inner side of the first hoop body 1 and the inner side of the second hoop body 2, an elastic pad 8 for hugging the outer wall of the casing is provided in the arc groove 100.

[0027] After the first hoop body 1 and the second hoop body 2 are connected by the movable buckle 6 and the connecting seat 7, the elastic pad 8 arranged in the arc groove 100 undergoes a certain degree of deformation and is closely attached to the outer wall of the casing, thereby being fixed on the outer wall of the casing, providing support and limiting for the centralizer on the casing, preventing the centralizer from sliding down and interfering with the buckle-on and buckle-off operations of the casing. The structure is simple, easy to carry and operate, and it replaces manual lifting of the centralizer, improving operation safety and reducing labor intensity. The casing centralizer limiting device can be hung on the outer wall of the casing through the magnet 5 and the rope 4, providing assistance for the installation and disassembly process, and preventing the casing centralizer limiting device from accidentally falling during the loading and unloading process.

[0028] like Figure 1 As shown, the movable buckle 6 includes a fixing seat 61, a handle 62 and a hook 63. The fixing seat 61 is fixed to the second end of the first hoop body 1, one end of the handle 62 is hinged to the fixing seat 61, and one end of the hook 63 is rotatably arranged on the handle 62 and detachably connected to the connecting seat 7. After the hook 63 is sleeved on the connecting seat 7, the hook 63 can be tightened by rotating the handle 62, so that the hook 63 is not easy to loosen from the connecting seat 7, thereby ensuring the stability of the connection between the first hoop body 1 and the second hoop body 2. When it is necessary to disassemble the casing centralizer limit device, the hook 63 can be removed from the connecting seat 7 by pulling the handle 62, and the operation is very simple.

[0029] like Figure 4 As shown, a limiting protrusion 71 is provided on one side of the connecting seat 7 away from the movable buckle 6. The limiting protrusion 71 can prevent the hook 63 from being displaced and thus prevent it from slipping off the connecting seat 7, thereby ensuring the stability of the connection between the first hoop body 1 and the second hoop body 2.

[0030] like Figure 5 As shown, the hook 63 includes a hook body 631 and two positioning posts 632 arranged at one end of the hook body 631. The two positioning posts 632 are arranged opposite to each other and at intervals. The handle 62 is provided with a positioning hole (not shown in the figure) for the positioning posts 632 to be inserted. Relying on the positioning posts 632, the hook 63 can rotate on the handle 62 and is not easy to fall off, thereby facilitating the connection and disassembly of the hook 63 and the connecting seat 7.

[0031] Furthermore, the hook body 631 includes an extension portion 6311 and a connection portion 6312, and the two ends of the extension portion 6311 are respectively connected to the positioning column 632 and one end of the connection portion 6312. The extension portion 6311 has a suitable length, so that the connection portion 6312 is connected to the connection seat 7 with a moderate degree of tightness, and will not be too tight to cause the operation to be laborious, nor will it be too loose to cause the hook 63 to be easily loosened.

[0032] like Figure 5 As shown, the extension portion 6311 includes a first segment 63111 and a second segment 63112 connected at an angle, one end of the first segment 63111 away from the second segment 63112 is connected to the positioning column 632, and one end of the second segment 63112 away from the first segment 63111 is connected to the connecting portion 6312. The movable buckle 6 and the connecting seat 7 are respectively arranged on the first hoop body 1 and the second hoop body 2, and the first hoop body 1 and the second hoop body 2 are both semicircular and have a certain curvature. The extension portion 6311 is in a bent state, so that the connecting portion 6312 is easier to hang on the connecting seat 7.

[0033] like Figure 3 As shown, the elastic pad 8 protrudes from the arc groove 100, so that the elastic pad 8 will replace the first hoop body 1 and the second hoop body 2 to contact the outer wall of the sleeve. The elastic pad 8 can be tightly attached to the outer wall of the sleeve by deformation, thereby achieving fixation.

[0034] Specifically, the elastic pad 8 includes a bottom pad 81 and two side pads 82 arranged on the bottom pad 81, the bottom pad 81 is arranged at the bottom of the arc groove 100, the side pads 82 are arranged at the groove wall of the arc groove 100, the first end of the side pad 82 is connected to the bottom pad 81, and the second end of the side pad 82 protrudes from the arc groove 100. The elastic pad 8 is in good contact with the groove wall and the groove bottom of the arc groove 100, so that the elastic pad 8 is not easy to fall out of the arc groove 100.

[0035] Furthermore, the distance between the second ends of the two side pads 82 is greater than the distance between the first ends of the two side pads 82. The shape of the elastic pad 8 matches the shape of the arc groove 100. The opening of the arc groove 100 is wider and the inside is narrower, so that the elastic pad 8 is easier to be inserted into the inside of the arc groove 100.

[0036] In this embodiment, the elastic pad 8 is made of rubber, which is low in cost and can generate greater friction between the outer wall of the casing, so that the casing centralizer limiting device is firmly fixed and has a reliable limiting effect on the centralizer.

[0037] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A casing centralizer limiter, characterized in that: It includes a first hoop body and a second hoop body, both of which are semicircular. The first end of the first hoop body is connected to the first end of the second hoop body through a hinge seat. A rope is provided on the hinge seat. A magnet is provided at the end of the rope away from the hinge seat. An active buckle is provided at the second end of the first hoop body. A connecting seat detachably connected to the active buckle is provided at the second end of the second hoop body. Arc grooves are provided on the inner sides of the first hoop body and the inner sides of the second hoop body. Elastic pads for hugging the outer wall of the sleeve are provided in the arc grooves.

2. The casing centralizer limiting device according to claim 1, characterized in that: The movable buckle includes a fixing seat, a handle and a hook, wherein the fixing seat is fixed to the second end of the first hoop body, one end of the handle is hinged to the fixing seat, and one end of the hook is rotatably arranged on the handle and detachably connected to the connecting seat.

3. The casing centralizer limiting device according to claim 2, characterized in that: A limiting protrusion is provided on one side of the connecting seat away from the movable buckle.

4. The casing centralizer limiting device according to claim 2, characterized in that: The hook comprises a hook body and two positioning posts arranged at one end of the hook body, the two positioning posts are arranged opposite to each other and at intervals, and a positioning hole for inserting the positioning posts is provided on the handle.

5. The casing centralizer limiting device according to claim 4, characterized in that: The hook body comprises an extending portion and a connecting portion, and two ends of the extending portion are respectively connected to the positioning column and one end of the connecting portion.

6. The casing centralizer limiting device according to claim 5, characterized in that: The extension portion includes a first segment and a second segment connected at an angle, wherein one end of the first segment away from the second segment is connected to the positioning column, and one end of the second segment away from the first segment is connected to the connecting portion.

7. The casing centralizer limiting device according to claim 1, characterized in that: The elastic pad protrudes from the arc-shaped groove.

8. The casing centralizer limiting device according to claim 7, characterized in that: The elastic pad includes a bottom pad and two side pads arranged on the bottom pad, the bottom pad is arranged at the bottom of the arc groove, the side pads are arranged at the groove wall of the arc groove, the first end of the side pad is connected to the bottom pad, and the second end of the side pad protrudes from the arc groove.

9. The casing centralizer limiting device according to claim 8, characterized in that: The distance between the second ends of the two side pads is greater than the distance between the first ends of the two side pads.

10. The casing centralizer limiting device according to claim 1, characterized in that: The elastic pad is made of rubber.

Images