Self-tightening centralizer

Abstract

The utility model relates to the technical field of centralizers, in particular to a self-tightening centralizer which comprises two sets of semicircular centralizing sleeves and semicircular connecting plates installed on the two end faces of the semicircular centralizing sleeves, a plurality of U-shaped clamping plates are arranged in the semicircular centralizing sleeves, and a plurality of supporting assemblies are arranged on the annular outer walls of the semicircular centralizing sleeves. The two sets of semicircular centralizing sleeves are arranged on the two sides of the casing pipe, primary connection of the two sets of semicircular centralizing sleeves is completed through rotation of the semicircular connecting plate, position adjustment of the multiple sets of U-shaped clamping plates is completed synchronously, fixing of casing pipes with different diameters is achieved, and the application range is widened; through rotation of the locking screw rod, final locking is completed, and meanwhile the self-tightening type fixing effect of the sleeve is achieved; in addition, the detachable supporting assembly is convenient to replace independently and can adapt to changes of oil wells with different diameters, and the problem that the centralizer is located in the oil well and stuck is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of centralizers, and particularly relates to a self-tightening centralizer. BACKGROUND

[0002] The oil well casing is an important component in the completion stage of the drilling construction process, and its smooth progress is particularly important. The casing centralizer is a device installed on the casing string and used to keep the casing string centered in the wellbore, thereby effectively reducing the contact area between the casing and the well wall and the friction between the casing and the well wall.

[0003] For example, the centralizer for the oil well casing disclosed in the prior art with the publication number CN219081515U has multiple elastic rib plates on the centralizer. Although the elastic rib plates can adapt to the changes in the well diameter in different situations and avoid the problem of the centralizer being stuck in the oil well, it is inconvenient to replace the damaged elastic rib plate quickly, thereby reducing the service life of the centralizer as a whole. In addition, the centralizer cannot be self-adaptively and self-tightly installed on the casing for different sizes of the casing, thereby making it difficult to further improve the application range of the centralizer.

[0004] In view of the above technical defects, a solution is proposed. INVENTION CONTENTS

[0005] The utility model discloses a self-tightening centralizer to solve the above-mentioned technical defects. The utility model places two groups of semicircular centralizing sleeves on both sides of the casing. The initial connection of the two groups of semicircular centralizing sleeves is completed by rotating the semicircular connecting plates, and the position adjustment of multiple U-shaped clamping plates is simultaneously completed, thereby realizing the fixation of casings with different diameters and improving the application range. The self-tightening fixation effect of the casing is realized by rotating the locking screw to complete the final locking. In addition, the detachable support assembly can be independently replaced and can also adapt to the changes in the oil well with different diameters, thereby avoiding the problem of the centralizer being stuck in the oil well.

[0006] The self-tightening centralizer is achieved by the following technical solutions: two groups of semicircular centralizing sleeves, semicircular connecting plates installed on the two end faces of the semicircular centralizing sleeves, multiple U-shaped clamping plates arranged in the semicircular centralizing sleeves, multiple telescopic sleeves fixedly connected between the U-shaped clamping plates and the semicircular centralizing sleeves at equal intervals, multiple support assemblies arranged on the annular outer wall of the semicircular centralizing sleeves, the support assemblies including movable plates, elastic plates fixedly connected to both ends of the movable plates, and movable plates fixedly connected to the free ends of the elastic plates, and the movable plates and one side of the elastic plates being rollingly embedded with rolling balls.

[0007] Preferably, the end face of the semi-circular centralizer is bolted with a semi-circular sliding rail, and the semi-circular connecting plate is provided with a sliding groove in sliding connection with the semi-circular sliding rail.

[0008] Preferably, the U-shaped clamping plate is fixedly connected with guide columns on both sides of the top and bottom, the semi-circular centralizer is provided with a straight slot in sliding connection with the corresponding guide column, and the semi-circular connecting plate is provided with an arc-shaped slot in sliding connection with the corresponding guide column.

[0009] Preferably, the two end faces of the semi-circular centralizer are fixedly connected with fixing seats, the fixing seat is provided with a trapezoidal groove on the side close to the semi-circular connecting plate, the semi-circular connecting plate is threadedly connected with a locking screw, and the one end of the locking screw is rotatably connected with a trapezoidal block in sliding connection with the trapezoidal groove.

[0010] Preferably, the annular outer wall of the semi-circular centralizer is provided with a T-shaped slot penetrating through the top, and the T-shaped slot is in sliding connection with a T-shaped mounting plate, the top of the T-shaped slot is threadedly connected with a locking stud, and the T-shaped mounting plate is fixedly connected with the second telescopic sleeve rod between the movable plate two.

[0011] Preferably, the movable block is fixedly connected to one side of the movable plate two, the T-shaped mounting plate is provided with a movable slot in sliding connection with the corresponding movable block, and the spring is fixedly connected between the side of the movable block away from the elastic plate and the movable slot.

[0012] The utility model discloses the beneficial effects are as follows:

[0013] (1) the utility model discloses two groups of semi-circular centralizers are placed in the casing on both sides of the to be righted, first, rotates the semi-circular connecting plate and completes the initial connection of two groups of semi-circular centralizers, second, utilizes the rotation of semi-circular connecting plate, and the guidance of arc-shaped slot to guide column, promotes the U-shaped clamping plate to hold casing, thereby realizes the fixing of casing of different diameters, and further improves the application range of the righting device, then, rotates the locking screw on each semi-circular connecting plate and drives the trapezoidal block to resist the trapezoidal groove, and by means of the resistance and sliding of trapezoidal block and trapezoidal groove inclined surface, can promote the further rotation of semi-circular connecting plate, improve the casing righting and clamping effect, and lock the position of semi-circular connecting plate at the same time, reach the self-tightening effect after the connection of semi-circular centralizer.

[0014] (2) the utility model discloses through the detachable mounting of support assembly on semi-circular centralizer, it is convenient for the righting and positioning of righting device carrying casing to be in the center, when some support assembly is damaged, it is convenient for quick replacement, and when the diameter of oil well is narrow, through the extrusion of movable plate one of well wall, promotes the deformation of both sides elastic plate, and promotes two groups of movable plate two to move apart and compress spring, promotes the righting device to pass through the narrow well diameter smoothly, to avoid the problem that the righting device is stuck, influences casing normal lifting. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model makes further illustration in combination with the drawings below.

[0016] Figure 1 It is the structural schematic diagram of the utility model;

[0017] Figure 2 It is the cooperation schematic diagram of the semicircle righting sleeve and the U type clamping plate of the utility model;

[0018] Figure 3 It is the structural schematic diagram of the semicircle righting sleeve of the utility model;

[0019] Figure 4 It is the structural schematic diagram of the semicircle connecting plate of the utility model;

[0020] Figure 5 It is the cooperation schematic diagram of the semicircle connecting plate and the U type clamping plate of the utility model;

[0021] Figure 6 It is the structural schematic diagram of the support assembly of the utility model.

[0022] Legend:

[0023] 1, semicircle righting sleeve;11, U type clamping plate;12, telescopic sleeve rod one;13, semicircle sliding rail;14, guide column;15, straight slot;16, fixed seat;17, trapezoidal groove;18, T type groove;

[0024] 2, semicircle connecting plate;21, sliding groove;22, arc slot;23, locking screw;24, trapezoidal block;

[0025] 3, support assembly;31, movable plate one;32, elastic plate;33, movable plate two;34, ball;35, T type mounting plate;36, telescopic sleeve rod two;37, movable block;38, movable slot;39, spring. Specific implementation

[0026] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.

[0027] Embodiment one: please refer to Figure 1 - Figure 5As shown, for different sizes of casing, the self-tightening installation of the centralizer cannot be adapted to the casing, and it is difficult to further improve the scope of application. The self-tightening centralizer of the present embodiment includes two groups of semicircular centralizing sleeves 1, which form a complete hollow cylindrical structure, facilitating installation on the outside of the oil well casing while providing full protection for the installation area. In addition, the semicircular connecting plates 2 are installed on the two end faces of the semicircular centralizing sleeves 1, which form a complete hollow disc structure. The semicircular centralizing sleeves 1 are provided with multiple U-shaped clamping plates 11, which are arranged in a ring array to increase the stability of the casing clamping. The multiple U-shaped clamping plates 11 are movable to clamp and fix the casing passing between the two semicircular centralizing sleeves 1, and the multiple U-shaped clamping plates 11 form an adjustable clamping area between each other to fix different diameter casings, thereby improving the scope of application of the centralizer. The U-shaped clamping plates 11 and the semicircular centralizing sleeves 1 are equidistantly fixedly connected with multiple telescopic sleeves 12, which are used to increase the connection stability of the adjustable spacing between the U-shaped clamping plates 11 and the corresponding semicircular centralizing sleeves 1, and limit the movement direction of the U-shaped clamping plates 11. Multiple support assemblies 3 are arranged on the annular outer wall of the semicircular centralizing sleeve 1. The support assembly 3 includes a movable plate 31, an elastic plate 32 fixedly connected to both ends of the movable plate 31, and a movable plate 33 fixedly connected to the free end of the elastic plate 32. The movable plate 31 and the elastic plate 32 are rollingly embedded with a ball 34 on one side. The V-shaped structure formed by the movable plate 31, the elastic plate 32 and the movable plate 33 enables one end of the centralizer to smoothly enter the narrow area inside the oil well, and in combination with the deformation characteristics of the elastic plate 32 under stress, the centralizer can smoothly pass through the narrow well diameter, thereby avoiding the problem of the centralizer being stuck, affecting the normal lifting of the casing. The ball 34 installed on the movable plate 31 and the elastic plate 32 can reduce the friction between the centralizer and the well wall.

[0028] The end face of the semicircular centralizing sleeve 1 is provided with a semicircular sliding rail 13, and the semicircular connecting plate 2 is provided with a sliding groove 21 connected with the semicircular sliding rail 13. The semicircular sliding rail 13 and the sliding groove 21 are used to realize the connection between the semicircular centralizing sleeve 1 and the semicircular connecting plate 2, and when the two groups of semicircular centralizing sleeves 1 are placed on both sides of the casing to be centralized and are in close contact with each other, the semicircular connecting plate 2 is rotated to connect the semicircular connecting plate 2 with the two semicircular sliding rails 13, thereby quickly completing the preliminary connection of the two groups of semicircular centralizing sleeves 1.

[0029] The top and bottom sides of the U-shaped clamping plate 11 are symmetrically fixedly connected with guide columns 14, the semicircular centralizer 1 is provided with linear grooves 15 in sliding connection with the corresponding guide columns 14, so that the free ends of the guide columns 14 are arranged outside the semicircular centralizer 1 without interfering with the movement of the guide columns 14, and the semicircular connecting plate 2 is provided with arc-shaped grooves 22 in sliding connection with the corresponding guide columns 14, the relative movement of the plurality of U-shaped clamping plates 11 is promoted by the rotation of the semicircular connecting plate 2 and the guidance of the guide columns 14 by the arc-shaped grooves 22, so as to clamp the casing pipe, thereby achieving the fixation of casing pipes with different diameters.

[0030] The two end faces of the semicircular centralizer 1 are fixedly connected with fixing seats 16, and the fixing seat 16 is provided with a trapezoidal groove 17 on the side close to the semicircular connecting plate 2, the semicircular connecting plate 2 is threadedly connected with a locking screw 23, one end of the locking screw 23 is rotatably connected with a trapezoidal block 24 in sliding connection with the trapezoidal groove 17, and the free end of the locking screw 23 is fixedly connected with a knob; after the U-shaped clamping plate 11 is in contact with the clamped casing pipe, the knob is rotated to drive the locking screw 23 to rotate, the locking screw 23 drives the trapezoidal block 24 to move downward in the trapezoidal groove 17, until the inclined surface of the trapezoidal block 24 is in contact with the inclined surface of the trapezoidal groove 17, the locking screw 23 is continuously rotated, and the further rotation of the semicircular connecting plate 2 is promoted by the sliding action of the trapezoidal block 24 and the inclined surface of the trapezoidal groove 17, so as to drive the U-shaped clamping plate 11 to further clamp the casing pipe, improve the casing pipe centralizing and clamping effect, and complete the position locking of the semicircular connecting plate 2, so as to achieve the self-tightening effect of the semicircular centralizer 1 after connection.

[0031] Embodiment two: please refer to Figure 3 With Figure 6 As shown in the figure, in order to solve the problem that it is not convenient to quickly replace a single support assembly when it is damaged, and reduce the overall service life of the centralizer, the following scheme can be used; in this embodiment, the annular outer wall of the semicircular centralizer 1 is provided with a T-shaped groove 18 penetrating through the top thereof, and a T-shaped mounting plate 35 is in sliding connection in the T-shaped groove 18, a locking stud is threadedly connected to the top of the T-shaped groove 18, a telescopic sleeve rod two 36 is fixedly connected between the T-shaped mounting plate 35 and the movable plate one 31, and the telescopic sleeve rod two 36 is used to limit the movement direction of the movable plate one 31 to be close to or away from the T-shaped mounting plate 35; through the sliding connection between the T-shaped mounting plate 35 and the T-shaped groove 18, the T-shaped mounting plate 35 is installed in the T-shaped groove 18, and the locking stud is installed at the top of the T-shaped groove 18 to limit the disengagement of the T-shaped mounting plate 35, thereby achieving the effect of quick installation, so that when a single support assembly 3 is damaged, it is convenient to quickly replace it, and the overall service life of the centralizer is improved.

[0032] One side of the movable plate two 33 is fixedly connected with a movable block 37, a T-shaped mounting plate 35 is provided with a movable slot 38 slidably connected with the corresponding movable block 37, and a spring 39 is fixedly connected between the side of the movable block 37 away from the elastic plate 32 and the movable slot 38; when the oil well diameter is narrowed, the movable plate one 31 is extruded by the well wall, the deformation of the two elastic plates 32 is caused, and the two groups of movable plate two 33 are pushed to move away from each other to compress the spring 39, so that the centralizer passes through the narrow well diameter smoothly, and then the movable plate two 33 is quickly reset by the compression elastic force of the spring 39, and the elastic plate 32 is rebounded.

[0033] The working process and principle of the utility model are as follows: in the using process, a plurality of T-shaped mounting plates 35 are sequentially installed in corresponding T-shaped grooves 18, locking bolts are installed at the top of the T-shaped grooves 18 to limit the disengagement of the T-shaped mounting plates 35, and the installation of the supporting assembly 3 is completed; the two groups of semicircular centralizing sleeves 1 are placed on the sides of the casing to be centralized and abut against each other, the installation positions of the semicircular centralizing sleeves 1 on the casing are adjusted, the semicircular connecting plates 2 are rotated to simultaneously connect the semicircular connecting plates 2 with the two semicircular sliding rails 13, the preliminary connection of the two groups of semicircular centralizing sleeves 1 is completed, the plurality of U-shaped clamping plates 11 are relatively moved to clamp the casing by rotating the semicircular connecting plates 2 and guiding the guide columns 14 through the arc-shaped grooves 22; the knob is rotated to drive the locking screw 23 to rotate, the trapezoidal block 24 is driven by the locking screw 23 to move downward in the trapezoidal groove 17, until the inclined surface of the trapezoidal block 24 contacts with the inclined surface of the trapezoidal groove 17, the locking screw 23 is continuously rotated, the semicircular connecting plates 2 are further rotated through the sliding action of the trapezoidal block 24 and the inclined surface of the trapezoidal groove 17, the U-shaped clamping plates 11 are further clamped to the casing, and the position of the semicircular connecting plates 2 is locked.

[0034] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A self-tightening centralizer, comprising two sets of semicircular centralizing sleeves (1), and semicircular connecting plates (2) mounted on two end faces of the semicircular centralizing sleeves (1), characterized in that: A plurality of U-shaped clamping plates (11) are provided inside the semicircular straightening sleeve (1), and a plurality of telescopic sleeve rods (12) are fixedly connected at equal intervals between the U-shaped clamping plates (11) and the semicircular straightening sleeve (1). A plurality of support assemblies (3) are provided on the annular outer wall of the semicircular straightening sleeve (1), and the support assemblies (3) include a movable plate (31), elastic plates (32) fixedly connected to both ends of the movable plate (31), and a movable plate (33) fixedly connected to the free end of the elastic plate (32), and balls (34) are embedded in the movable plate (31) and one side of the elastic plate (32).

2. The self-tightening centralizer according to claim 1, characterized in that: The end face bolts of the semicircular straightening sleeve (1) are mounted with a semicircular slide rail (13), and the semicircular connecting plate (2) is provided with a slide groove (21) that is slidably connected to the semicircular slide rail (13).

3. The self-tightening centralizer according to claim 1, characterized in that: The top and bottom sides of the U-shaped clamping plate (11) are symmetrically fixedly connected with guide columns (14), the semicircular straightening sleeve (1) is provided with a linear groove (15) slidably connected to the corresponding guide column (14), and the semicircular connecting plate (2) is provided with an arc groove (22) slidably connected to the corresponding guide column (14).

4. The self-tightening centralizer according to claim 1, characterized in that: A fixing seat (16) is fixedly connected to both end surfaces of the semicircular straightening sleeve (1), and a trapezoidal groove (17) is provided on the fixing seat (16) on one side close to the semicircular connecting plate (2). A locking screw (23) is threadedly connected to the semicircular connecting plate (2), and one end of the locking screw (23) is rotatably connected to a trapezoidal block (24) that is slidably connected to the trapezoidal groove (17).

5. The self-tightening centralizer according to claim 1, characterized in that: The annular outer wall of the semicircular straightening sleeve (1) is provided with a T-slot (18) running through the top thereof, and a T-mounting plate (35) is slidably connected in the T-slot (18), a locking stud is threadedly connected to the top of the T-slot (18), and a telescopic sleeve rod (36) is fixedly connected between the T-mounting plate (35) and the movable plate (31).

6. The self-tightening centralizer according to claim 5, characterized in that: A movable block (37) is fixedly connected to one side of the movable plate 2 (33), a movable groove (38) is provided on the T-shaped mounting plate (35) and is slidably connected to the corresponding movable block (37), and a spring (39) is fixedly connected between the movable groove (38) and the side of the movable block (37) away from the elastic plate (32).

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