A combined sucker rod centralizer

Abstract

The application discloses a combined sucker rod centralizer and relates to the technical field of sucker rod centralizers.The combined sucker rod centralizer comprises an upper fixing sleeve and a centralizing assembly, the upper fixing sleeve is connected to the outer side of a sucker rod body in a sleeving mode, a movable upper adjusting mechanism is connected to the lower side of the upper fixing sleeve, and the upper adjusting mechanism is connected to the upper side of the centralizing assembly.The combined sucker rod centralizer can automatically realize the rotating action of the centralizing assembly through the rolling cooperation between the inclined blocks and the balls under the inertial force of the up-and-down movement of the sucker rod, so that the contact points between the steel balls and the inner wall of the oil pipe are continuously and dynamically changed, the local concentrated wear caused by the fixed contact points of the traditional centralizer is avoided, and the bidirectional stable support of the upper guide rod, the lower guide rod and the centralizing assembly can be realized through the automatic cooperation between the first inclined block and the second inclined block, the instability caused by the inertial deviation of the centralizing assembly is avoided, and the stability of the device is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sucker rod centralizer, in particular to a combined sucker rod centralizer. BACKGROUND

[0002] In the process of oilfield exploitation, when the sucker rod reciprocates in the oil pipe, due to the factors such as well deviation, irregular well trajectory or bending of the sucker rod, the sucker rod is prone to eccentric wear with the inner wall of the oil pipe, causing problems such as oil pipe wear and sucker rod fracture, which seriously affects the oil production efficiency and equipment life, so that the centralizer needs to be installed on the outer side of the sucker rod to realize the guiding and anti-wear effect.

[0003] At present, the conventional sucker rod centralizer usually adopts a fixed structure, that is, the centralizer is rigidly connected with the sucker rod to provide radial support, and the friction contact point cannot be dynamically adjusted. In the long-term operation process, the contact position between the centralizer and the inner wall of the oil pipe is fixed, which can easily cause local wear to intensify, and even cause problems such as oil pipe puncture or centralizer failure. SUMMARY

[0004] The present application aims to provide a combined sucker rod centralizer to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a combined sucker rod centralizer, comprising an upper fixed sleeve and a centralizing assembly, the upper fixed sleeve is connected to the outer side of the sucker rod body through sleeving, the lower side of the upper fixed sleeve is connected with an upper adjusting mechanism which can move up and down, the upper adjusting mechanism is connected with the upper side of the centralizing assembly, the lower side of the centralizing assembly is connected with a lower adjusting mechanism, and the lower adjusting mechanism and the upper adjusting mechanism cooperate to make the centralizing assembly rotate around the axis of the sucker rod body under the action of gravity and inertia, and the lower adjusting mechanism is connected with the lower fixed sleeve to make the lower adjusting mechanism move up and down.

[0006] Preferably, a plurality of upper ear plates are fixed at equal angles on the upper end of the upper fixed sleeve, and the upper ear plates are fixed to the sucker rod body through bolts or welding, and a plurality of first inclined surface blocks are fixed at equal angles on the inner side of the upper fixed sleeve, the stability of the fixed connection between the upper fixed sleeve and the sucker rod body can be ensured through the action of the upper ear plates.

[0007] Preferably, the upper adjusting mechanism comprises an upper mounting ring arranged below the upper fixed sleeve, a plurality of first clamping grooves are arranged at equal angles on the upper mounting ring, a first outer ring and a first inner ring are fixed at the same center on the upper mounting ring, and the first outer ring and the first inner ring are in sliding connection with the upper fixed sleeve, the sliding guiding action between the first outer ring, the first inner ring and the upper fixed sleeve can guide the deflection of the upper mounting ring and the up and down movement of the upper mounting ring, and the normal operation of the device is ensured.

[0008] Preferably, a plurality of upper guide rods are also equiangularly arranged on the upper mounting ring, and the upper guide rods and the first inclined blocks are in one-to-one correspondence, and the upper guide rods are provided with upper rolling balls which can roll, and the upper rolling balls are in contact with the upper inclined surfaces of the first inclined blocks and roll thereon, so that when the upper mounting ring moves relative to the upper fixed sleeve, the rolling action between the upper rolling balls and the upper inclined surfaces of the first inclined blocks can provide a basic force for the deflection of the upper mounting ring, thereby ensuring the normal operation of the device.

[0009] Preferably, the upper guide rods and the upper annular plate are in sliding connection, the upper annular plate is in contact with the upper fixed sleeve to form sliding connection, and a plurality of first springs are equiangularly fixed between the upper annular plate and the upper mounting ring, so that the elastic action of the first springs can provide a basic force for the automatic resetting of the upper mounting ring, thereby ensuring the normal operation of the device.

[0010] Preferably, the righting assembly comprises a mounting frame equiangularly arranged below the upper adjusting mechanism, and the mounting frame is also symmetrically fixed with clamping blocks in the up-down direction, and the upper clamping blocks and the first clamping grooves are in nested connection, and the upper clamping blocks are locked with the upper mounting ring through locking bolts, so that the mounting frame can be conveniently disassembled and assembled, thereby improving the convenience of device maintenance when a single mounting frame needs to be repaired or replaced.

[0011] Preferably, the mounting frame is provided with a mounting groove, and the mounting groove is provided with rolling steel balls, and the steel balls are positioned by positioning shafts and the mounting frame, and the side edges of the steel balls are also provided with chip removal grooves formed in the mounting frame, so that the rolling action of the steel balls can effectively reduce friction and prolong the service life of the device, and the action of the chip removal grooves can facilitate the removal of debris.

[0012] Preferably, the lower adjusting mechanism comprises a lower mounting ring arranged below the mounting frame, the lower mounting ring is provided with second clamping grooves which are nested with the lower clamping blocks, and the lower mounting ring is locked with the lower clamping blocks through locking bolts, and the lower side of the lower mounting ring is fixed with a second outer ring and a second inner ring with the same center, and the second outer ring and the second inner ring are in sliding connection with the lower fixed sleeve, so that the sliding guide action between the second outer ring, the second inner ring and the lower fixed sleeve can ensure the stability of the movement or deflection of the lower mounting ring.

[0013] Preferably, a plurality of lower guide rods are equiangularly fixed to the lower side of the lower mounting ring, and the end portions of the lower guide rods are provided with lower rolling balls which can roll, and the lower guide rods and the lower annular plate are in sliding connection, and the lower annular plate and the lower fixed sleeve are in contact to form sliding connection, and a plurality of second springs are equiangularly fixed between the lower annular plate and the lower mounting ring, so that the action of the second springs can provide a basic force for the automatic resetting of the lower mounting ring.

[0014] Preferably, the lower end surface of the lower fixing sleeve is fixed with a plurality of lower lugs at equal angles, and the lower lugs are fixed with the sucker rod body through bolts or welding, and a plurality of second inclined blocks are fixed in the lower fixing sleeve at equal angles, and the second inclined blocks are in contact with the lower balls.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1. The combined sucker rod centralizer can realize the rotation of the centralizing assembly automatically through the rolling cooperation of the inclined blocks and the balls under the inertial force of the upward and downward movement of the sucker rod, so that the contact points between the steel balls and the inner wall of the oil pipe change dynamically and continuously, the local concentrated wear caused by the fixed contact points of the traditional centralizer is avoided, and the bidirectional stable support of the upper guide rod, the lower guide rod and the centralizing assembly can be realized through the automatic cooperation of the first inclined block and the second inclined block, the instability caused by the inertial deviation of the centralizing assembly is avoided, and the stability of the device is ensured.

[0017] 2. The combined sucker rod centralizer can facilitate the disassembly and replacement of the single centralizing assembly during the use of the device, and the whole centralizing assembly is mainly guided and limited by the rolling of the steel balls, that is, the steel balls are the main wear parts, the steel balls can be replaced conveniently through the detachable positioning shaft, and other parts can be reused, so that the actual use requirement is better met, and compared with the traditional integrated centralizer, the maintenance efficiency can be improved and the use cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a front view of the overall structure of the device of the present application;

[0019] Figure 2 It is a split state three-dimensional structure diagram of the upper adjusting mechanism and the centralizing assembly of the present application;

[0020] Figure 3 It is a split state three-dimensional structure diagram of the upper fixing sleeve and the upper adjusting mechanism of the present application;

[0021] Figure 4 It is a front view of the centralizing assembly of the present application;

[0022] Figure 5 It is a front view of the centralizing assembly of the present application;

[0023] Figure 6 It is a split state three-dimensional structure diagram of the upper fixing sleeve and the upper adjusting mechanism of the present application;

[0024] In the figure: 1, the upper fixed sleeve; 101, the upper ear plate; 102, the first inclined block; 2, the sucker rod body; 3, the upper adjusting mechanism; 301, the upper mounting ring; 302, the first clamping groove; 303, the first outer ring; 304, the first inner ring; 305, the upper guide rod; 306, the upper ball; 307, the upper annular plate; 308, the first spring; 4, the centralizing assembly; 401, the mounting frame; 402, the clamping block; 403, the locking bolt; 404, the mounting groove; 405, the steel ball; 406, the positioning shaft; 407, the chip removal groove; 5, the lower adjusting mechanism; 501, the lower mounting ring; 502, the second clamping groove; 503, the second outer ring; 504, the second inner ring; 505, the lower guide rod; 506, the lower ball; 507, the lower annular plate; 508, the second spring; 6, the lower fixed sleeve; 601, the lower ear plate; 602, the second inclined block. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] Please refer to Figures 1-6 The present application provides a technical solution: a combined sucker rod centralizer, comprising an upper fixed sleeve 1 and a centralizing assembly 4, the upper fixed sleeve 1 is connected outside the sucker rod body 2, the lower side of the upper fixed sleeve 1 is connected with an upper adjusting mechanism 3 which can move up and down, the upper adjusting mechanism 3 is connected with the upper side of the centralizing assembly 4, the lower side of the centralizing assembly 4 is connected with a lower adjusting mechanism 5, and the lower adjusting mechanism 5 cooperates with the upper adjusting mechanism 3 to make the centralizing assembly 4 rotate around the axis of the sucker rod body 2 under the action of gravity and inertia, and the lower adjusting mechanism 5 is connected with the lower fixed sleeve 6 to make the lower adjusting mechanism 5 move up and down.

[0027] The upper end of the upper fixed sleeve 1 is fixed with a plurality of upper ear plates 101 at equal angles, and the upper ear plates 101 are fixed with the sucker rod body 2 by bolts or welding, and the inner side of the upper fixed sleeve 1 is fixed with a plurality of first inclined blocks 102 at equal angles; the lower end surface of the lower fixed sleeve 6 is fixed with a plurality of lower ear plates 601 at equal angles, and the lower ear plates 601 are fixed with the sucker rod body 2 by bolts or welding, and the inner side of the lower fixed sleeve 6 is also fixed with a plurality of second inclined blocks 602 at equal angles, and the second inclined blocks 602 are in contact with the lower balls 506;

[0028] When using the combined sucker rod centralizer, for example, Figure 1As shown, first, the upper fixing sleeve 1 and the lower fixing sleeve 6 are sleeved outside the sucker rod body 2, and through the sliding action between the upper fixing sleeve 1, the lower fixing sleeve 6 and the sucker rod body 2, the position of the whole centralizer on the sucker rod body 2 can be adjusted, after the adjustment is completed, through the cooperation of the bolt with the upper lug plate 101 and the lower fixing sleeve 6, the locking action of the upper fixing sleeve 1, the lower fixing sleeve 6 and the sucker rod body 2 can be realized, so that the installation and fixation of the whole device are realized;

[0029] The upper adjusting mechanism 3 comprises an upper mounting ring 301 arranged below the upper fixing sleeve 1, a plurality of first clamping grooves 302 are equiangularly arranged on the upper mounting ring 301, and a first outer ring 303 and a first inner ring 304 are fixed with the same center on the upper mounting ring 301, and the first outer ring 303 and the first inner ring 304 are in sliding connection with the upper fixing sleeve 1; a plurality of upper guide rods 305 are equiangularly arranged on the upper mounting ring 301, the upper guide rods 305 and the first inclined blocks 102 are in one-to-one correspondence, the upper guide rods 305 are provided with rollable upper balls 306, the upper balls 306 are in contact with the inclined surfaces of the first inclined blocks 102 and roll, the upper guide rods 305 are in sliding connection with an upper annular plate 307, the upper annular plate 307 is in contact with the upper fixing sleeve 1 to form a sliding connection, and a plurality of first springs 308 are equiangularly fixed between the upper annular plate 307 and the upper mounting ring 301; the lower adjusting mechanism 5 comprises a lower mounting ring 501 arranged below the mounting frame 401, a second clamping groove 502 is arranged on the lower mounting ring 501 and is nested with the lower clamping block 402, the lower mounting ring 501 is locked with the lower clamping block 402 through the locking bolt 403, a second outer ring 503 and a second inner ring 504 are fixed with the same center on the lower side of the lower mounting ring 501, and the second outer ring 503 and the second inner ring 504 are in sliding connection with the lower fixing sleeve 6; a plurality of lower guide rods 505 are equiangularly fixed on the lower side of the lower mounting ring 501, the lower guide rods 505 are provided with rollable lower balls 506 at the end portions, the lower guide rods 505 are in sliding connection with a lower annular plate 507, the lower annular plate 507 is in contact with the lower fixing sleeve 6 to form a sliding connection, and a plurality of second springs 508 are equiangularly fixed between the lower annular plate 507 and the lower mounting ring 501;

[0030] After the installation of the device is completed, as shown in FIG. 6, the upper fixing sleeve 1 and the lower fixing sleeve 6 are in sliding connection with the sucker rod body 2, and the upper fixing sleeve 1 and the lower fixing sleeve 6 are locked with the sucker rod body 2 through the cooperation of the bolt with the upper lug plate 101 and the lower fixing sleeve 6, so that the position of the whole centralizer on the sucker rod body 2 is adjusted, and the installation and fixation of the whole device are realized; Figures 1-6As shown, when the sucker rod body 2 moves up and down to pump oil, the entire centralizer moves synchronously, at which time the steel ball 405 rolls on the inner wall of the oil pipe to achieve guidance, ensuring the stability of the upward and downward movement of the sucker rod body 2. During the upward and downward movement of the sucker rod body 2, when the sucker rod body 2 moves downward, the centralizer assembly 4 moves to one side of the upper fixing sleeve 1 under the action of inertia, thereby driving the upper mounting ring 301 and the lower mounting ring 501 to move upward, thereby synchronously driving the upper guide rod 305 and the upper ball 306 to move upward. The rolling action between the upper ball 306 and the upper inclined surface of the first inclined block 102 and the sliding action between the first outer ring 303, the first inner ring 304 and the upper fixing sleeve 1 make the upper mounting ring 301 deflect by a certain angle under stress. The deflection of the upper mounting ring 301 can synchronously drive the mounting bracket 401 to deflect by a certain angle. When the mounting bracket 401 deflects, the lower mounting ring 501 can be synchronously deflected, so that the lower ball 506 rolls along the inclined surface of the second inclined block 602. When the upper ball 306 moves to the highest point of the upper inclined surface of the first inclined block 102, the lower ball 506 moves to the lowest point of the second inclined block 602. The action of the second inclined block 602 and the first inclined block 102 can achieve stable support of the upper guide rod 305 and the lower guide rod 505, thereby achieving stable support of the upper mounting ring 301, the lower mounting ring 501 and the mounting bracket 401, ensuring the stability of the device. The deflection of the mounting bracket 401 can drive the steel ball 405 to deflect. When the mounting bracket 401 moves downward relative to the sucker rod body 2, the mounting bracket 401 can deflect by a certain angle, so that the movement path of the steel ball 405 is arc-shaped rather than linear, thereby achieving dynamic adjustment of the contact point between the steel ball 405 and the inner wall of the oil pipe. The deflection adjustment of the steel ball 405 can achieve dispersion of friction force and avoid concentrated wear;

[0031] According to the above principle, when the sucker rod body 2 moves upward, the centralizer assembly 4 moves to one side of the lower fixing sleeve 6 under the action of inertia and gravity. The sliding action between the lower ball 506 and the inclined surface of the second inclined block 602 can make the centralizer assembly 4 rotate in the opposite direction, further adjust the movement path of the steel ball 405, effectively achieve dispersion of friction force and avoid concentrated wear;

[0032] In addition, during the upward and downward movement of the sucker rod body 2, the elastic force of the first spring 308 or the second spring 508 needs to be overcome when the centralizer assembly 4 moves under the action of inertia, so that the state of the centralizer assembly 4 changes every time it moves, that is, the movement path of the steel ball 405 is an irregular path that is adjusted in real time, thereby avoiding local wear caused by a single path;

[0033] The straightening component 4 includes a mounting frame 401 that is equidistantly distributed below the upper adjustment mechanism 3. The mounting frame 401 is also symmetrically fixed with locking blocks 402, and the upper locking block 402 is nested with the first locking groove 302. The upper locking block 402 is locked to the upper mounting ring 301 by locking bolts 403. The mounting frame 401 is provided with a mounting groove 404, and a rolling steel ball 405 is installed in the mounting groove 404. The steel ball 405 is positioned with the mounting frame 401 by a positioning shaft 406. The side of the steel ball 405 is also provided with a chip removal groove 407 opened on the mounting frame 401.

[0034] During the use of the device, such as Figures 1-4 As shown, when the steel ball 405 rolls along the inner wall of the oil pipe, the chip removal groove 407 facilitates the discharge of debris between the steel ball 405 and the mounting groove 404, thereby preventing the presence of debris from increasing the friction of the steel ball 405 and affecting its service life. Furthermore, when the steel ball 405 needs to be replaced due to wear after long-term use, the mounting bracket 401 can be disassembled simply by loosening the locking bolt 403, and the positioning shaft 406 can be removed to release the positioning of the steel ball 405, facilitating the disassembly and replacement of the steel ball 405 and effectively reducing the maintenance cost of the device.

[0035] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A combined sucker rod centralizer, comprising an upper fixing sleeve (1) and a centralizer assembly (4), characterized in that: The upper fixing sleeve (1) is sleeved and connected to the outside of the sucker rod body (2). The lower side of the upper fixing sleeve (1) is connected to an upper adjustment mechanism (3) that can move up and down. The upper adjustment mechanism (3) is connected to the upper side of the straightening component (4). The lower side of the straightening component (4) is connected to a lower adjustment mechanism (5). The lower adjustment mechanism (5) and the upper adjustment mechanism (3) work together under the action of gravity and inertia to allow the straightening component (4) to rotate around the axis of the sucker rod body (2). The lower adjustment mechanism (5) is connected to the lower fixing sleeve (6) to allow the lower adjustment mechanism (5) to move up and down. The upper adjustment mechanism (3) includes a part located below the upper fixing sleeve (1). The upper mounting ring (301) has several first slots (302) at equal angles. The upper mounting ring (301) has a first outer ring (303) and a first inner ring (304) fixed at the same center. The first outer ring (303) and the first inner ring (304) are slidably connected to the upper fixing sleeve (1). The straightening component (4) includes a mounting frame (401) distributed at equal angles below the upper adjusting mechanism (3). The mounting frame (401) also has symmetrically fixed blocks (402) on its upper and lower sides. The upper block (402) is nested with the first slot (302). The upper block (402) is also nested with the first slot (302). The lower adjustment mechanism (5) is locked to the upper mounting ring (301) by locking bolts (403). The lower adjustment mechanism (5) includes a lower mounting ring (501) located below the mounting bracket (401). The lower mounting ring (501) has a second slot (502) that nests with the lower side locking block (402). The lower mounting ring (501) is locked to the lower side locking block (402) by locking bolts (403). At the same time, a second outer ring (503) and a second inner ring (504) are fixed to the lower side of the lower mounting ring (501) at the same center. The second outer ring (503), the second inner ring (504) and the lower fixing sleeve (6) are slidably connected. The upper mounting ring (301) is also equipped with several upper guide rods (305) at equal angles, and the upper guide rods (305) are distributed in a one-to-one correspondence with the first inclined block (102). The upper guide rods (305) are equipped with rolling upper balls (306), and the upper balls (306) roll in contact with the inclined surface of the first inclined block (102). The upper guide rods (305) are slidably connected to the upper annular plate (307), and the upper annular plate (307) is in contact with the upper fixed sleeve (1) to form a sliding connection. Several first springs (308) are fixed at equal angles between the upper annular plate (307) and the upper mounting ring (301).The lower mounting ring (501) is also fixed with several lower guide rods (505) at equal angles on its lower side, and the lower guide rods (505) are fitted with rolling lower balls (506) at their ends. The lower guide rods (505) and the lower annular plate (507) are slidably connected. The lower annular plate (507) and the lower fixing sleeve (6) are also slidably connected. Several second springs (508) are fixed at equal angles between the lower annular plate (507) and the lower mounting ring (501). Several lower ear plates (601) are fixed at equal angles on the lower end face of the lower fixing sleeve (6), and the lower ear plates (601) are fixed to the sucker rod body (2) by bolts or welding. Several second inclined blocks (602) are also fixed at equal angles inside the lower fixing sleeve (6), and the second inclined blocks (602) are in contact with the lower balls (506).

2. The combined sucker rod centralizer according to claim 1, characterized in that: The upper fixed sleeve (1) has several upper ear plates (101) fixed at equal angles on its upper end, and the upper ear plates (101) are fixed to the sucker rod body (2) by bolts or welding. The upper fixed sleeve (1) has several first inclined blocks (102) fixed at equal angles on its inner side.

3. A combined sucker rod centralizer according to claim 2, characterized in that: The mounting bracket (401) has a mounting groove (404) and a rolling steel ball (405) is installed in the mounting groove (404). The steel ball (405) is positioned with the mounting bracket (401) by a positioning shaft (406). At the same time, a chip removal groove (407) is provided on the side of the steel ball (405) on the mounting bracket (401).

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