Combined sucker rod centralizer

Abstract

The invention 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 penetrating and sleeving manner, the lower side of the upper fixing sleeve is connected with an upper adjusting mechanism capable of moving up and down, and the upper adjusting mechanism is connected with the upper side of the centralizing assembly. According to the combined sucker rod centralizer, the rotation effect of the centralizing assembly is automatically achieved through the inertia force of up-down movement of a sucker rod and rolling fit of the slope blocks and the balls, so that the contact points of the steel balls and the inner wall of an oil pipe are continuously and dynamically changed, and the situation that local concentrated abrasion is caused due to the fact that the contact points of a traditional centralizer are fixed is avoided; and through high-low position automatic matching of the first inclined plane block and the second inclined plane block, bidirectional stable supporting of the upper guide rod, the lower guide rod and the centralizing assembly can be achieved, the situation that the centralizing assembly is unstable due to inertia offset is avoided, and the operation stability of the device is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of sucker rod centralizer technology, specifically a combined sucker rod centralizer. Background Technology

[0002] During oilfield extraction, when the sucker rod reciprocates inside the tubing, factors such as well inclination, irregular wellbore trajectory, or the bending of the sucker rod itself can easily cause uneven wear between the sucker rod and the inner wall of the tubing, resulting in tubing wear, sucker rod breakage, and other problems, which seriously affect oil production efficiency and equipment life. Therefore, it is necessary to install a centralizer on the outside of the sucker rod to achieve guidance and anti-wear function. Currently, conventional sucker rod centralizers typically employ a fixed structure, meaning the centralizer is rigidly connected to the sucker rod to provide radial support. This makes it impossible to dynamically adjust the friction contact point. During long-term operation, the contact position between the centralizer and the inner wall of the tubing remains fixed, which can easily lead to increased local wear and even cause problems such as tubing puncture or centralizer failure. Summary of the Invention

[0003] The purpose of this invention is to provide a combined sucker rod centralizer to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a combined sucker rod centralizer, comprising an upper fixing sleeve and a centralizer assembly. The upper fixing sleeve is sleeved and connected to the outside of the sucker rod body. An upper adjustment mechanism that can move up and down is connected to the lower side of the upper fixing sleeve. The upper adjustment mechanism is interconnected with the upper side of the centralizer assembly. A lower adjustment mechanism is connected to the lower side of the centralizer assembly. The lower adjustment mechanism and the upper adjustment mechanism, in conjunction with gravity and inertia, allow the centralizer assembly to rotate around the axis of the sucker rod body. The lower adjustment mechanism is interconnected with the lower fixing sleeve, allowing the lower adjustment mechanism to move up and down.

[0005] Preferably, the upper fixed sleeve has several upper ear plates fixed at equal angles on its upper end, and the upper ear plates are fixed to the sucker rod body by bolts or welding. Several first inclined blocks are fixed at equal angles on the inner side of the upper fixed sleeve. Through the action of the upper ear plates, the stability of the upper fixed sleeve and the sucker rod body can be ensured.

[0006] Preferably, the upper adjustment mechanism includes an upper mounting ring disposed below the upper fixed sleeve, and the upper mounting ring has a plurality of first slots opened at equal angles. The upper mounting ring has a first outer ring and a first inner ring fixed at the same center. The first outer ring and the first inner ring are slidably connected to the upper fixed sleeve. Through the sliding guide effect between the first outer ring, the first inner ring and the upper fixed sleeve, the deflection of the upper mounting ring can be guided, and the up and down movement of the upper mounting ring can be guided, ensuring the normal operation of the device.

[0007] Preferably, the upper mounting ring is also equipped with a plurality of upper guide rods at equal angles, and the upper guide rods are distributed in a one-to-one correspondence with the first inclined block. The upper guide rods are equipped with rolling upper balls, which roll in contact with the upper inclined surface of the first inclined block. When the upper mounting ring moves relative to the upper fixed sleeve, the rolling action between the upper balls and the upper inclined surface of the first inclined block provides a basic force for the deflection of the upper mounting ring, thereby ensuring the normal operation of the device.

[0008] Preferably, the upper guide rod and the upper annular plate are slidably connected, and the upper annular plate and the upper fixed sleeve are in contact to form a slidably connected connection. Furthermore, a number of first springs are fixed at equal angles between the upper annular plate and the upper mounting ring. Through the elastic action of the first springs, a basic force can be provided for the automatic reset of the upper mounting ring, ensuring the normal operation of the device.

[0009] Preferably, the straightening component includes a mounting frame distributed at equal angles below the upper adjustment mechanism, and the mounting frame is also symmetrically fixed with upper and lower locking blocks. The upper locking block and the first locking groove are nested together. At the same time, the upper locking block is locked to the upper mounting ring by locking bolts. With the above structure, the mounting frame can be easily disassembled and assembled, so that when a single mounting frame needs to be repaired or replaced, it can be disassembled and assembled, improving the convenience of device maintenance.

[0010] Preferably, the mounting frame has a mounting groove, and a rolling steel ball is installed in the mounting groove. The steel ball is positioned with the mounting frame by a positioning shaft. At the same time, a chip removal groove is provided on the side of the steel ball on the mounting frame. The rolling action of the steel ball can effectively reduce friction and extend the service life of the device. The chip removal groove can also facilitate the discharge of debris.

[0011] Preferably, the lower adjustment mechanism includes a lower mounting ring disposed below the mounting bracket, and the lower mounting ring has a second slot that nests with the lower side locking block. The lower mounting ring is locked to the lower side locking block by a locking bolt. At the same time, a second outer ring and a second inner ring are fixed concentrically on the lower side of the lower mounting ring. The second outer ring, the second inner ring and the lower fixing sleeve are slidably connected. Through the sliding guiding effect between the second outer ring, the second inner ring and the lower fixing sleeve, the stability of the movement or deflection of the lower mounting ring can be ensured.

[0012] Preferably, a plurality of lower guide rods are fixed at equal angles on the lower side of the lower mounting ring, and the ends of the lower guide rods are equipped with rolling lower balls. The lower guide rods are slidably connected to the lower annular plate, and the lower annular plate is in contact with the lower fixed sleeve to form a slidable connection. A plurality of second springs are fixed at equal angles between the lower annular plate and the lower mounting ring. Through the action of the second springs, a basic force can be provided for the automatic reset of the lower mounting ring.

[0013] Preferably, a plurality of lower ear plates are fixed at equal angles on the lower end face of the lower fixed sleeve, and the lower ear plates are fixed to the sucker rod body by bolts or welding. Furthermore, a plurality of second inclined blocks are fixed at equal angles inside the lower fixed sleeve, and the second inclined blocks are in contact with the lower ball bearings. Through the above structure, the stability of the connection between the lower fixed sleeve and the sucker rod body can be guaranteed.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This combined sucker rod centralizer utilizes the inertial force of the sucker rod's up-and-down movement and the rolling action of the inclined blocks and balls to automatically rotate the centralizing assembly. This causes the contact point between the steel balls and the inner wall of the tubing to continuously and dynamically change, avoiding the localized concentrated wear caused by the fixed contact point in traditional centralizers. Furthermore, through the automatic high-low coordination of the first and second inclined blocks, bidirectional stable support can be achieved for the upper guide rod, lower guide rod, and centralizing assembly, preventing instability caused by inertial offset of the centralizing assembly and ensuring the stability of the device operation. 2. This combined sucker rod centralizer, with its detachable, equally angled centralizing components, allows for easy disassembly and replacement of individual centralizing components during operation, eliminating the need for complete replacement. The entire centralizing assembly relies primarily on rolling steel balls for guidance and positioning, meaning the steel balls are the main wear parts. The detachable positioning shaft facilitates easy replacement of the steel balls, while other components are reusable. This better meets practical application needs and, compared to traditional integrated centralizers, improves maintenance efficiency and reduces operating costs. Attached Figure Description

[0015] Figure 1 This is a frontal three-dimensional structural diagram of the overall composition of the device of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the upper adjustment mechanism and the straightening component in a disassembled state according to the present invention; Figure 3 This is a three-dimensional structural diagram of the upper fixing sleeve and the upper adjusting mechanism of the present invention in a disassembled state; Figure 4 This is a frontal cross-sectional three-dimensional structural diagram of the straightening component of the present invention; Figure 5 This is a frontal cross-sectional three-dimensional structural diagram of the upper fixing sleeve and the upper adjusting mechanism of the present invention; Figure 6 This is a bottom-view cross-sectional three-dimensional structural diagram of the lower adjustment mechanism and the lower fixing sleeve of the present invention.

[0016] In the diagram: 1. Upper fixing sleeve; 101. Upper ear plate; 102. First inclined block; 2. Sucker rod body; 3. Upper adjusting mechanism; 301. Upper mounting ring; 302. First slot; 303. First outer ring; 304. First inner ring; 305. Upper guide rod; 306. Upper ball bearing; 307. Upper annular plate; 308. First spring; 4. Straightening assembly; 401. Mounting bracket; 402. Locking block; 403 404. Locking bolt; 405. Mounting groove; 406. Steel ball; 407. Positioning shaft; 408. Chip removal groove; 5. Lower adjustment mechanism; 501. Lower mounting ring; 502. Second slot; 503. Second outer ring; 504. Second inner ring; 505. Lower guide rod; 506. Lower ball; 507. Lower annular plate; 508. Second spring; 6. Lower fixing sleeve; 601. Lower ear plate; 602. Second inclined block. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-6 The present invention provides a technical solution: a combined sucker rod centralizer, including an upper fixing sleeve 1 and a centralizer assembly 4. The upper fixing sleeve 1 is sleeved and connected to the outside of the sucker rod body 2. An upper adjustment mechanism 3 that can move up and down is connected to the lower side of the upper fixing sleeve 1. The upper adjustment mechanism 3 is connected to the upper side of the centralizer assembly 4. A lower adjustment mechanism 5 is connected to the lower side of the centralizer assembly 4. The lower adjustment mechanism 5 and the upper adjustment mechanism 3 cooperate with gravity and inertia to make the centralizer assembly 4 rotate around the axis of the sucker rod body 2. The lower adjustment mechanism 5 is connected to the lower fixing sleeve 6 to make the lower adjustment mechanism 5 move up and down.

[0019] 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 inner side of the upper fixed sleeve 1 has several first inclined blocks 102 fixed at equal angles. The lower fixed sleeve 6 has several lower ear plates 601 fixed at equal angles on its lower end face, and the lower ear plates 601 are fixed to the sucker rod body 2 by bolts or welding. The lower fixed sleeve 6 also has several second inclined blocks 602 fixed at equal angles inside, and the second inclined blocks 602 are in contact with the lower ball bearing 506. When using this combined sucker rod centralizer, such as Figure 1As shown, firstly, the upper fixing sleeve 1 and the lower fixing sleeve 6 are put on the outside of the sucker rod body 2. Through the sliding action between the upper fixing sleeve 1 and the lower fixing sleeve 6 and the sucker rod body 2, the position of the entire centralizer on the sucker rod body 2 can be adjusted. After the adjustment is completed, the upper fixing sleeve 1, the lower fixing sleeve 6 and the sucker rod body 2 can be locked by the bolts cooperating with the upper ear plate 101 and the lower fixing sleeve 6, thereby realizing the installation and fixation of the entire device. The upper adjustment mechanism 3 includes an upper mounting ring 301 disposed below the upper fixed sleeve 1. The upper mounting ring 301 has several first slots 302 formed at equal angles. A first outer ring 303 and a first inner ring 304 are concentrically fixed on the upper mounting ring 301, and the first outer ring 303 and the first inner ring 304 are slidably connected to the upper fixed sleeve 1. Several upper guide rods 305 are also installed at equal angles on the upper mounting ring 301, and the upper guide rods 305 are distributed one-to-one with the first inclined block 102. Rollable upper balls 306 are installed on the upper guide rods 305, and the upper balls 306 contact and roll 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 contacts the upper fixed sleeve 1 to form a sliding connection. Several first slots 302 are fixed at equal angles between the upper annular plate 307 and the upper mounting ring 301. Spring 308; The lower adjustment mechanism 5 includes a lower mounting ring 501 disposed below the mounting bracket 401, and 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 a locking bolt 403. At the same time, a second outer ring 503 and a second inner ring 504 are fixed at the same center on the lower side of the lower mounting ring 501. The second outer ring 503 and the second inner ring 504 are slidably connected to the lower fixing sleeve 6. Several lower guide rods 505 are also fixed at equal angles on the lower side of the lower mounting ring 501. The lower guide rods 505 are equipped with rolling lower balls 506 at their ends. The lower guide rods 505 are slidably connected to the lower annular plate 507. At the same time, the lower annular plate 507 contacts the lower fixing sleeve 6 to form a slidable connection. Several second springs 508 are fixed at equal angles between the lower annular plate 507 and the lower mounting ring 501. After the device is installed, such as Figures 1-6As shown, when the sucker rod body 2 moves up and down to pump oil, it simultaneously drives the entire centralizer to move. At this time, the steel ball 405 rolls against the inner wall of the tubing to guide the movement, ensuring the stability of the sucker rod body 2's up and down movement. During the up and down movement of the sucker rod body 2, when it moves downwards, the centralizer assembly 4, under the action of inertia, is forced to move towards the upper fixed sleeve 1, thereby driving the upper mounting ring 301 and lower mounting ring 501 upwards. This, in turn, drives the upper guide rod 305 and upper ball bearing 306 upwards. Combined with the rolling action between the upper ball bearing 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 fixed sleeve 1, the upper mounting ring 301 is forced to deflect at a certain angle. This deflection of the upper mounting ring 301 simultaneously drives the mounting frame 401 to deflect at a certain angle. Furthermore, when the mounting frame 401 deflects, it simultaneously drives the lower mounting ring 501 to move upwards. The upper ball 506 rolls along the inclined surface of the second inclined block 602 when the upper ball 306 reaches the highest point of the upper inclined surface of the first inclined block 102. At this time, the lower ball 506 reaches the lowest point of the second inclined block 602. Through the action of the second inclined block 602 and the first inclined block 102, the upper guide rod 305 and the lower guide rod 505 can be stably supported, thereby achieving stable support for the upper mounting ring 301, the lower mounting ring 501, and the mounting bracket 401. The support ensures the stability of the device, and the deflection of the mounting bracket 401 can drive the steel ball 405 to deflect as well. That is, when the mounting bracket 401 moves downward on the sucker rod body 2, the mounting bracket 401 can simultaneously generate a certain angle of deflection, so that the movement path of the steel ball 405 is arc-shaped instead of the traditional straight line. This achieves dynamic adjustment of the contact point between the steel ball 405 and the inner wall of the tubing. Through the deflection adjustment of the steel ball 405, the friction force can be dispersed, avoiding concentrated wear. Based on the above principle, when the sucker rod body 2 moves upward, under the action of inertia and gravity, the straightening component 4 is forced to move to the side of the downward fixed sleeve 6. With the sliding action between the lower ball 506 and the inclined surface of the second inclined block 602, the straightening component 4 can rotate in the opposite direction, further adjusting the movement path of the steel ball 405, effectively dispersing the friction force and avoiding concentrated wear. Furthermore, during the up-and-down movement of the sucker rod body 2, due to the elastic action of the first spring 308 or the second spring 508, the straightening component 4 needs to overcome the elastic force of the first spring 308 or the second spring 508 when it moves under the action of inertia. As a result, the state of the straightening component 4 changes each time it moves. That is, the movement path of the steel ball 405 is an irregular path that is adjusted in real time, which can avoid the existence of local wear on a single path. 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. 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.

[0020] 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.

[0021] 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 assembly (4). The lower side of the straightening assembly (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 assembly (4) to rotate around the axis of the sucker rod body (2). The upper adjustment mechanism (5) is connected to the lower fixed sleeve (6) so that the lower adjustment mechanism (5) can move up and down. The upper adjustment mechanism (3) includes an upper mounting ring (301) located below the upper fixed sleeve (1), and 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 on the upper mounting ring (301) with the same center. At the same time, the first outer ring (303) and the first inner ring (304) are connected to the upper fixed sleeve (1). The upper adjustment mechanism (4) is a sliding connection. It includes a mounting bracket (401) evenly distributed below the upper adjustment mechanism (3), and symmetrically fixed upper and lower locking blocks (402) on the mounting bracket (401). The upper locking block (402) and the first locking groove (302) are nested together. The upper locking block (402) is locked to the upper mounting ring (301) by a locking bolt (403). The lower adjustment mechanism (5) includes a mounting bracket (401) located below the mounting bracket (401). The lower mounting ring (501) has a second slot (502) that is nested and cooperates with the lower side locking block (402). The lower mounting ring (501) is locked to the lower side locking block (402) by a locking bolt (403). At the same time, the lower mounting ring (501) has a second outer ring (503) and a second inner ring (504) fixed at the same center on the lower side. The second outer ring (503), the second inner ring (504) and the lower fixing sleeve (6) are slidably connected.

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 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).

4. A combined sucker rod centralizer according to claim 3, characterized in that: The upper guide rod (305) and the upper annular plate (307) are slidably connected, and the upper annular plate (307) and the upper fixed sleeve (1) are in contact to form a slidable connection. Furthermore, a number of first springs (308) are fixed at equal angles between the upper annular plate (307) and the upper mounting ring (301).

5. A combined sucker rod centralizer according to claim 4, 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).

6. A combined sucker rod centralizer according to claim 5, characterized in that: 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 equipped with rolling lower balls (506) at their ends. The lower guide rods (505) and the lower annular plate (507) are slidably connected. At the same time, the lower annular plate (507) and the lower fixing sleeve (6) are in contact to form a slidable connection. Several second springs (508) are fixed at equal angles between the lower annular plate (507) and the lower mounting ring (501).

7. A combined sucker rod centralizer according to claim 6, characterized in that: The lower fixed sleeve (6) has several lower ear plates (601) fixed at equal angles on its lower end face. The lower ear plates (601) are fixed to the sucker rod body (2) by bolts or welding. The lower fixed sleeve (6) also has several second inclined blocks (602) fixed at equal angles inside. The second inclined blocks (602) are in contact with the lower ball bearing (506).

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