Semi-rigid spiral centralizer

Abstract

The utility model discloses a semi-rigid spiral centralizer, which relates to the field of centralizers and comprises a centralizer main body, a movable opening is arranged inside the centralizer main body, a threaded rod is movably connected inside the movable opening, and the semi-rigid spiral centralizer further comprises a synchronous shifting component, a spiral shaft and a spiral shaft, an adjusting assembly; and a support assembly. The shifting block is shifted to drive the gear ring to rotate, the gear ring rotates to adjust the gear connected with the gear ring in a meshed mode to rotate, then the threaded rod is driven to rotate, and the two vertically-symmetrical movable plates in threaded connection with the two sections of threads with different thread directions of the outer ring of the threaded rod move oppositely at the moment. The two movable plates move in the opposite directions, the inclined plates abut against the idler wheels to enable the idler wheels to move, in this way, the two symmetrically-arranged idler wheels move in the opposite directions or move away from each other to be matched with pipe sleeves which are inserted into the centralizer body and are different in size, and it is guaranteed that the application range of the centralizer body is larger.

Description

Technical Field

[0001] The utility model relates to the field of centralizers, in particular to a semi-rigid spiral centralizer. Background Art

[0002] In some engineering operations involving downhole casing installation and the need to straighten the casing, semi-rigid spiral centralizers can play their role in straightening and improving fluid flow.

[0003] Existing Chinese patent authorization publication number: CN208718577U, discloses a semi-rigid spiral centralizer with an inner roller. The centralizer comprises a cylindrical centralizer body, the outer surface of which is provided with a shuttle-shaped centralizing block. The inner wall of the centralizer body is provided with a groove, and the roller is disposed in the groove. The roller is axially fixed to the wall of the centralizer body by a roller shaft, and one end of the roller shaft is fixed to the centralizer body by a limit pin. The centralizer can achieve a stable centralizing effect while enabling the centralizer to flexibly rotate around the casing when the oil and gas well casing is lowered. This converts the friction between the well wall and the centralizer, and between the centralizer and the casing, into rolling friction, thereby reducing the frictional resistance when the oil and gas well casing is lowered.

[0004] The above-mentioned semi-rigid spiral centralizer has the following problems when in use: the position of the roller in the above-mentioned semi-rigid spiral centralizer is not adjustable, so that the centralizer body is only suitable for pipe sleeves of one size, which results in a small range of application of the centralizer body and low practicality of the centralizer body.

[0005] Therefore, it is necessary to invent a semi-rigid spiral centralizer to solve the above problems. Utility Model Content

[0006] The purpose of the present utility model is to provide a semi-rigid spiral centralizer to solve the problem proposed in the above-mentioned background art that the roller position in the semi-rigid spiral centralizer cannot be adjusted, so that the centralizer body is only adapted to a pipe sleeve of one size, which results in a small range of application of the centralizer body and low practicality of the centralizer body.

[0007] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a semi-rigid spiral centralizer, comprising a centralizer body, wherein a movable opening is provided inside the centralizer body, and a threaded rod is movably connected inside the movable opening, and further comprising:

[0008] Synchronous toggle assembly, the interior of the centralizer body is provided with an annular cavity, and the interior of the annular cavity is rotatably connected to a gear ring, and the gear ring is meshed with a gear, and the gear is fixedly sleeved on the outer ring of the threaded rod to facilitate the subsequent rotation of the gear ring;

[0009] An adjustment component, wherein a movable plate is movably connected to the interior of the movable opening, the movable plate is threadedly connected to the threaded rod, a notch is opened inside the movable plate, and the interior of the notch is rotatably connected to one end of the inclined plate through a cross bar, and a notch 2 is provided at the other end of the inclined plate through a cross bar, and is rotatably connected to the end of the roller shaft in the roller, so as to facilitate adjustment of the spacing between the two rollers;

[0010] The support assembly comprises a mounting opening inside the main body of the centralizer, a threaded rod passing through the mounting opening, a collar fixedly connected to the inner wall of the mounting opening, and a movable connection between the collar and the arc plate is achieved through an elastic sleeve, and the arc plate is rotationally connected to the roller.

[0011] Preferably, the movable openings are provided in two groups with a total of four, wherein the two movable openings distributed vertically in each group are symmetrically arranged, and the two groups of movable openings are symmetrically arranged left and right inside the main body of the centralizer.

[0012] Preferably, the upper end of the threaded rod extends to the interior of the annular cavity, and the upper end of the threaded rod is rotatably connected to the inner wall of the annular cavity through a bearing to ensure the stability of the threaded rod's rotation;

[0013] The outer ring of the threaded rod is provided with two sections of threads with opposite directions. The length of each thread is equal to the height of the movable opening corresponding to the thread, and the shaft body at other positions of the threaded rod is smooth.

[0014] Preferably, each of the threaded rods is provided with a threaded shaft outer ring which is threadedly connected to a movable plate, and the outer wall of the movable plate is in contact with the inner wall of the movable opening and is slidably connected, so that when the threaded rod rotates, the movable plate which is threadedly connected to the threaded rod can move inside the movable opening.

[0015] Preferably, a shift block is fixedly connected to the annular outer wall of the gear ring, and the shift block extends to the outside of the stabilizer body through the notch communicated with the annular cavity, so as to facilitate the rotation of the gear ring by the shift block.

[0016] Preferably, the inner ring of the gear ring is provided with two symmetrical tooth blocks, and the two symmetrical tooth blocks are respectively meshed with the gears set on the outer rings of the two threaded rods, so as to facilitate the rotation of the gears meshed with the gear ring when the gear ring is turned, thereby driving the rotation of the threaded rod.

[0017] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0018] The utility model drives the rotation of the gear ring by shifting the shifting block, and the rotation of the gear ring mobilizes the rotation of the gear meshing with it, thereby driving the rotation of the threaded rod. The two upper and lower symmetrical movable plates, which are threadedly connected to the two sections of the outer ring of the threaded rod with different thread directions, now move toward each other. The opposite movement of the two movable plates presses the rollers against the inclined plate to cause the rollers to be displaced. In this way, the two symmetrically arranged rollers move toward each other or away from each other to match the pipe sleeves of different sizes inserted into the interior of the centralizer body, thereby ensuring a wider range of applicability of the centralizer body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0021] Figure 2 This is a three-dimensional diagram of the internal structure of the centralizer body (partially cut away) of the present invention;

[0022] Figure 3 For the utility model Figure 2 A magnified stereoscopic image of the structure at point A in the middle;

[0023] Figure 4 This is an exploded view of the connection structure between the support assembly and the centralizer body of the utility model.

[0024] Description of reference numerals:

[0025] 1. Centralizer body; 2. Movable opening; 3. Threaded rod; 4. Synchronous toggle assembly; 401. Annular cavity; 402. Gear; 403. Gear ring; 404. Toggle block; 405. Notch; 5. Adjustment assembly; 501. Movable plate; 502. Notch 1; 503. Crossbar 1; 504. Inclined plate; 505. Notch 2; 506. Crossbar 2; 507. Roller; 6. Support assembly; 601. Mounting opening; 602. Ring; 603. Elastic sleeve; 604. Arc plate. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] The utility model provides Figures 1-4A semi-rigid spiral centralizer shown includes a centralizer body 1, a movable opening 2 is provided inside the centralizer body 1, and a threaded rod 3 is movably connected inside the movable opening 2, and further includes:

[0028] Synchronous toggle assembly 4, an annular cavity 401 is provided inside the centralizer body 1, and a gear ring 403 is rotatably connected inside the annular cavity 401, and the gear ring 403 is meshed with a gear 402. The gear 402 is fixedly sleeved on the outer ring of the threaded rod 3 to facilitate the subsequent rotation of the gear ring 403;

[0029] Adjustment assembly 5, movable opening 2 is internally movably connected to a movable plate 501, which is threadedly connected to threaded rod 3. A notch 1 502 is provided inside movable plate 501, and the interior of notch 1 502 is rotatably connected to one end of inclined plate 504 via cross bar 1 503. A notch 2 505 provided at the other end of inclined plate 504 is rotatably connected to the end of the roller shaft of roller 507 via cross bar 2 506, so as to facilitate adjustment of the spacing between the two rollers 507.

[0030] The support assembly 6 and the centralizer body 1 are provided with an installation opening 601, the threaded rod 3 passes through the interior of the installation opening 601, and the inner wall of the installation opening 601 is fixedly connected with a collar 602, and the collar 602 and the arc plate 604 are movably connected through an elastic sleeve 603, and the arc plate 604 is rotationally connected with the roller 507.

[0031] There are four movable openings 2 in two groups, wherein the two movable openings 2 distributed vertically in each group are symmetrically arranged, and the two groups of movable openings 2 are symmetrically arranged left and right inside the centralizer body 1 .

[0032] The upper end of the threaded rod 3 extends into the interior of the annular cavity 401, and the upper end of the threaded rod 3 is rotatably connected to the inner wall of the annular cavity 401 via a bearing, thereby ensuring the rotation stability of the threaded rod 3;

[0033] The outer ring of the threaded rod 3 is provided with two sections of threads with opposite screw directions. The length of each thread is equal to the height of the movable opening 2 corresponding to the thread, and the shaft of the threaded rod 3 at other positions is smooth.

[0034] Each threaded rod 3 is provided with a threaded outer ring of the shaft, which is threadedly connected to a movable plate 501, and the outer wall of the movable plate 501 is in contact with the inner wall of the movable opening 2 to achieve a sliding connection, so that when the threaded rod 3 rotates, the movable plate 501 threadedly connected to the threaded rod 3 can move inside the movable opening 2.

[0035] A shift block 404 is fixedly connected to the annular outer wall of the gear ring 403 , and the shift block 404 extends to the outside of the centralizer body 1 through a notch 405 communicating with the annular cavity 401 , so as to facilitate the rotation of the gear ring 403 by the shift block 404 .

[0036] The inner ring of the gear ring 403 is provided with two symmetrical tooth blocks, and the two symmetrical tooth blocks are respectively engaged with the gears 402 set on the outer rings of the two threaded rods 3, so that when the gear ring 403 is turned, the gears 402 engaged with the gear ring 403 can be rotated, thereby driving the rotation of the threaded rods 3.

[0037] Working principle: When using a semi-rigid spiral centralizer, first, by shifting the shift block 404, the gear ring 403, which is not fixedly connected to the end of the shift block 404, is driven to rotate. The shift block 404 moves inside the corresponding notch 405. The rotation of the gear ring 403 drives the rotation of the gear 402, which is meshed with the two gear blocks symmetrically arranged at the inner ring of the gear ring 403. The two sets of gears 402 rotate in the same direction, which in turn drives the rotation of the threaded rod 3 fixedly plugged into the inner ring of the gear 402. The two pieces of threaded connection with the two sections of the outer ring of the threaded rod 3 with different screw directions are relatively close to each other. The symmetrical movable plates 501 now move toward each other. The movable openings 2 symmetrically arranged at the upper and lower positions, which are in contact with the outer walls of the movable plates 501 and are movably connected, ensure the stability of the movable plates 501. As the two movable plates 501 on the same side move toward each other, the inclined plates 504 support the two ends of the inner roller shafts of the rollers 507, causing the rollers 507 to move. In this way, the two symmetrically arranged rollers 507 move toward each other or away from each other to match the different sized pipe sleeves inserted into the interior of the centralizer body 1, ensuring a wider range of applicability of the centralizer body 1.

[0038] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A semi-rigid spiral centralizer, comprising a centralizer body (1), characterized in that, The centralizer body (1) is provided with a movable opening (2) inside, and a threaded rod (3) is movably connected inside the movable opening (2), and further comprises: A synchronous toggle assembly (4), wherein an annular cavity (401) is provided inside the centralizer body (1), and a gear ring (403) is rotatably connected inside the annular cavity (401), and the gear ring (403) is meshedly connected with a gear (402), and the gear (402) is fixedly sleeved on the outer ring of the threaded rod (3); An adjustment component (5), wherein the movable opening (2) is internally movably connected to a movable plate (501), the movable plate (501) is threadedly connected to the threaded rod (3), a notch (502) is provided inside the movable plate (501), and the interior of the notch (502) is rotatably connected to one end of the inclined plate (504) via a crossbar (503), and a notch (505) provided at the other end of the inclined plate (504) is rotatably connected to the end of the roller shaft in the roller (507) via a crossbar (506); A support assembly (6), wherein a mounting opening (601) is provided inside the centralizer body (1), a threaded rod (3) passes through the inside of the mounting opening (601), and a collar (602) is fixedly connected to the inner wall of the mounting opening (601), and a movable connection is achieved between the collar (602) and the arc plate (604) via an elastic sleeve (603), and the arc plate (604) is rotationally connected to the roller (507).

2. The semi-rigid screw centralizer according to claim 1, characterized in that, The movable openings (2) are provided in two groups, with a total of four, wherein the two movable openings (2) distributed vertically in each group are symmetrically arranged, and the two groups of movable openings (2) are symmetrically arranged left and right inside the centralizer body (1).

3. The semi-rigid helical centralizer according to claim 1, characterized in that, The upper end of the threaded rod (3) extends to the interior of the annular cavity (401), and the upper end of the threaded rod (3) is rotatably connected to the inner wall of the annular cavity (401) via a bearing; The outer ring of the threaded rod (3) is provided with two sections of threads with opposite directions, the length of each thread is equal to the height of the movable opening (2) corresponding to the thread, and the shaft body of the threaded rod (3) at other positions is smooth.

4. A semi-rigid helical centralizer according to claim 1, characterized in that, Each threaded rod (3) is provided with a threaded shaft outer ring which is threadedly connected to a movable plate (501), and the outer wall of the movable plate (501) is in contact with the inner wall of the movable opening (2) to achieve a sliding connection.

5. A semi-rigid spiral centralizer according to claim 1, characterized in that, A shift block (404) is fixedly connected to the annular outer wall of the gear ring (403), and the shift block (404) extends through a notch (405) connected to the annular cavity (401) to the outside of the centralizer body (1).

6. The semi-rigid screw centralizer according to claim 1, characterized in that, The inner ring of the gear ring (403) is provided with two symmetrical tooth blocks, and the two symmetrical tooth blocks are respectively meshed and connected with the gears (402) set on the outer rings of the two threaded rods (3).

Images