Rigid spiral roller centralizer

Abstract

The utility model belongs to the technical field of centralizers, and discloses a rigid spiral roller centralizer which comprises a positioning pipe, the inner surface of the positioning pipe is fixedly connected with a connecting mechanism, and the outer surface of the positioning pipe is fixedly connected with four wear-resistant mechanisms. Through the connecting mechanism, when the roller centralizer needs to be used for centralizing a casing pipe, the roller centralizer can be conveniently connected with a lifting pipe or an extension pipe, so that the centralizer can be conveniently carried and moved and is more convenient to use, the loading condition is improved through structure optimization, the service life is prolonged, and the wear-resistant performance is improved through the cooperation of the four wear-resistant mechanisms. The four flow guide grooves are formed in the outer surface of the positioning pipe, the friction force between a casing pipe and a well wall can be reduced through the combined action of the four flow guide grooves, the flow resistance of slurry and the resistance of the casing pipe are reduced, the rotational flow speed of the slurry is increased, the abrasion resistance of the centralizer is improved, and the practicability of the centralizer is improved.

Description

Technical Field

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

[0002] Rigid centralizers are critical tools in drilling operations. Their versatility makes them widely used in vertical, highly deviated, and horizontal wells, as well as in rotary casing running operations. Their primary function is to significantly reduce frictional resistance, ensuring casing centering and penetration deep into the wellbore, while also optimizing fluid flow and grouting conditions. Rigid centralizers can be configured with left-hand, right-hand, or straight bars to suit drilling requirements. They are easy to install and highly wear-resistant, and their working surfaces can be inlaid with hard materials for enhanced durability.

[0003] Chinese Patent Authorization Announcement No. CN202673180U discloses a rigid spiral roller centralizer. This solution utilizes a spiral, large-chamfered centralizer diameter to effectively promote mud swirl velocity. Chamfered and pointed ends of the centralizer diameter minimize mud flow resistance and casing running resistance. Wide-diameter guide grooves and rollers mounted on the centralizer diameter enhance wear resistance, reduce friction between the casing and the wellbore, and extend service life. Crafted entirely from alloy steel, this device offers high centralizing strength and cementing quality. Suitable for use in both directional and horizontal wells.

[0004] However, there are still the following defects in the specific implementation process: the centralizer is not easy to connect with the riser or extension pipe during use, which makes transportation and installation difficult.

[0005] Based on this, the utility model designs a rigid spiral roller centralizer to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a rigid spiral roller centralizer.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A rigid spiral roller centralizer comprises a positioning tube, an inner surface of the positioning tube is fixedly connected to a connecting mechanism, and an outer surface of the positioning tube is fixedly connected to four wear-resistant mechanisms;

[0009] Furthermore, the connecting mechanism includes a connecting pipe, the outer surface of the connecting pipe is fixedly connected to the inner surface of the positioning pipe, the inner surface of the connecting pipe is provided with an internal connecting thread, and the outer surface of the connecting pipe is provided with an external connecting thread;

[0010] Furthermore, the wear-resistant mechanism includes a straightening bar, the inner surface of which is fixedly connected to the outer surface of the positioning tube, and the outer surface of the straightening bar is provided with two roller grooves, and the left and right walls of the inner cavity of the two roller grooves are fixedly connected to roller assemblies;

[0011] Furthermore, the roller assembly includes a positioning rod, the left and right ends of the positioning rod are respectively fixedly connected to the left and right walls of the roller groove cavity, the outer surface of the positioning rod is fixedly connected to two support members, the outer sides of the two support members are commonly fixedly connected to a hollow roller, and the inner surface of the hollow roller is fixedly connected to two auxiliary members;

[0012] Furthermore, the support member includes a bearing, the outer surface of the bearing is fixedly connected to a connecting ring 1, the outer surface of the connecting ring 1 is fixedly connected to a plurality of supporting blocks 1, the outer surfaces of the plurality of supporting blocks 1 are commonly fixedly connected to a connecting ring 2, and the outer surface of the connecting ring 2 is fixedly connected to a plurality of supporting blocks 2;

[0013] Furthermore, the auxiliary component includes a limiting inner ring, a retaining ring is slidably connected to the outer surface of the limiting inner ring, a plurality of tapered rollers are slidably connected to the outer surface of the limiting inner ring, and the outer surfaces of the plurality of tapered rollers are slidably connected to a connecting outer ring;

[0014] Furthermore, the inner surfaces of the two limiting inner rings are fixedly connected to the outer surface of the positioning rod, and the outer surfaces of the two connecting outer rings are fixedly connected to the inner surface of the hollow roller;

[0015] Furthermore, the outer surfaces of the two support blocks are fixedly connected to the inner cavity of the hollow roller, and the inner surfaces of the two bearings are fixedly connected to the outer surface of the positioning rod. Beneficial effects

[0016] (1) This solution uses a connecting mechanism to facilitate the connection between the roller centralizer and the lifting pipe or extension pipe when the roller centralizer is needed to straighten the casing, so that the centralizer can be easily transported and moved, which is more convenient to use and improves the practicality of the centralizer.

[0017] (2) This scheme forms four guide grooves on the outer surface of the positioning tube through the cooperation of four wear-resistant mechanisms. The four guide grooves work together to reduce the friction between the casing and the well wall, reduce the flow resistance of the mud and the casing resistance, promote the mud vortex speed, and increase the wear resistance of the stabilizer.

[0018] (3) This solution improves the load conditions and extends the service life through structural optimization. During the drilling process, the stabilizer can not only control the trajectory of the hole, but also has certain functions of expanding the hole and trimming the wall, making the wall smoother, thereby improving the wellbore quality and drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

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

[0021] Figure 2 This is a schematic diagram of the connection mechanism of the utility model;

[0022] Figure 3 This is a schematic diagram of the wear-resistant mechanism of the utility model;

[0023] Figure 4 This is a schematic diagram of the roller assembly of the present utility model;

[0024] Figure 5 This is a schematic diagram of a support member of the present utility model;

[0025] Figure 6 This is a schematic diagram of the auxiliary parts of the present utility model.

[0026] The numbers in the figure represent:

[0027] 1. Positioning tube; 2. Connecting mechanism; 21. Connecting tube; 22. Internal connecting thread; 23. External connecting thread; 3. Wear-resistant mechanism; 31. Straightening bar; 32. Roller groove; 33. Roller assembly; 331. Positioning rod; 332. Support member; 3321. Bearing; 3322. Connecting ring 1; 3323. Support block 1; 3324. Connecting ring 2; 3325. Support block 2; 333. Hollow roller; 334. Auxiliary member; 3341. Limiting inner ring; 3342. Positioning ring; 3343. Connecting outer ring; 3344. Tapered roller. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] The present invention will be further described below with reference to the embodiments.

[0030] In some embodiments, refer to the description attached Figure 1-6 A rigid spiral roller centralizer, comprising a positioning pipe 1, a connecting mechanism 2 is fixedly connected to the inner surface of the positioning pipe 1, and four wear-resistant mechanisms 3 are fixedly connected to the outer surface of the positioning pipe 1.

[0031] In the embodiment of the utility model, the connecting mechanism 2 and the four wear-resistant mechanisms 3 are connected together by the positioning pipe 1, in the use process, the connecting mechanism 2 can be used to connect the centralizer with the wireline, the lifting machinery is used to move the centralizer, the centralizer is connected with the casing, the four wear-resistant mechanisms 3 are used, the friction between the casing and the well wall can be reduced, the flow resistance and the casing resistance of the slurry are reduced, and the slurry rotational speed is promoted.

[0032] In some embodiments, as shown in Figure 1-2 As a preferred embodiment of the utility model, the connecting mechanism 2 comprises a connecting pipe 21, the outer surface of the connecting pipe 21 is fixedly connected with the inner surface of the positioning pipe 1, the inner surface of the connecting pipe 21 is provided with an inner connecting thread 22, and the outer surface of the connecting pipe 21 is provided with an outer connecting thread 23.

[0033] In the embodiment of the utility model, the inner connecting thread 22 can be used to threadedly connect the centralizer with the wireline, the lifting machinery is used to move the centralizer, the inner connecting thread 22 and the outer connecting thread 23 are used together, the casing can be added to the both ends of the connecting pipe 21, and the centralizer can be applied to the wellhead of different depths.

[0034] In some embodiments, as shown in Figure 3-6 As a preferred embodiment of the utility model, the wear-resistant mechanism 3 comprises a centralizing strip 31, the inner surface of the centralizing strip 31 is fixedly connected with the outer surface of the positioning pipe 1, the outer surface of the centralizing strip 31 is provided with two roller grooves 32, and the left and right walls in the inner cavity of the two roller grooves 32 are fixedly connected with roller assembly 33.

[0035] The roller assembly 33 comprises a positioning rod 331, the left and right ends of the positioning rod 331 are fixedly connected with the left and right walls in the inner cavity of the roller groove 32, the outer surface of the positioning rod 331 is fixedly connected with two supporting pieces 332, the outer portions of the two supporting pieces 332 are fixedly connected with a hollow roller 333, and the inner surface of the hollow roller 333 is fixedly connected with two auxiliary pieces 334.

[0036] The support 332 comprises bearings 3321, the inner surfaces of the two bearings 3321 are fixedly connected with the outer surface of the positioning rod 331, the outer surface of the bearing 3321 is fixedly connected with a connecting ring one 3322, the outer surface of the connecting ring one 3322 is fixedly connected with a plurality of support blocks one 3323, the outer surfaces of the plurality of support blocks one 3323 are fixedly connected with a connecting ring two 3324, the outer surface of the connecting ring two 3324 is fixedly connected with a plurality of support blocks two 3325, and the outer surfaces of the plurality of support blocks two 3325 are fixedly connected with the inner cavities of the hollow rollers 333.

[0037] The auxiliary part 334 comprises limiting inner rings 3341, the inner surfaces of the two limiting inner rings 3341 are fixedly connected with the outer surface of the positioning rod 331, the outer surface of the limiting inner ring 3341 is slidingly connected with a clamping ring 3342, the outer surface of the limiting inner ring 3341 is slidingly connected with a plurality of tapered rollers 3344, the outer surfaces of the plurality of tapered rollers 3344 are slidingly connected with connecting outer rings 3343, and the outer surfaces of the two connecting outer rings 3343 are fixedly connected with the inner surfaces of the hollow rollers 333.

[0038] In the embodiment of the utility model, utilize positioning rod 331 to two auxiliary parts 334 and two support 332 positioning, when the centralizer is put into the well mouth, if the outer surface of a plurality of hollow rollers 333 will be close to the well wall, at this time, connecting ring one 3322 and a plurality of support blocks one 3323 and connecting ring two 3324 and a plurality of support blocks two 3325 will play a role together, support a plurality of hollow rollers 333 from the inside, avoid a plurality of hollow rollers 333 will be extruded contraction, a plurality of hollow rollers 333 adopt hollow design, can increase its maximum area when sliding on the well wall, can reduce the overall loss of the outer surface of the hollow roller 333, improve the service life, simultaneously through the joint action of two bearings 3321 and two auxiliary parts 334, guarantee the flexibility of a plurality of hollow rollers 333, utilize the joint cooperation of two groups of limiting inner rings 3341 and a plurality of tapered rollers 3344 and connecting outer rings 3343, form two tapered bearings, and the taper heads of the two tapered bearings are outward, can effectively avoid the phenomenon that the centralizer is stuck after entering the well mouth, cannot slide along the well wall.

[0039] Working principle: when rigid spiral roller centralizer is needed, first use inner connecting thread 22 to threadedly connect the centralizer with the wireline, facilitate the use of hoisting machinery to move the centralizer, use the joint action of inner connecting thread 22 and outer connecting thread 23 to add sleeve on both ends of connecting pipe 21, so that the centralizer can be applied to different depth wellheads, after connection, lower the centralizer with the sleeve into the well, the outer surface of the hollow rollers 333 will be close to the well wall, at this time, the connecting ring one 3322 and the plurality of supporting blocks one 3323 and the connecting ring two 3324 and the plurality of supporting blocks two 3325 will jointly play a role, support the plurality of hollow rollers 333 from the inside, avoid the plurality of hollow rollers 333 from being squeezed and contracted, the plurality of hollow rollers 333 adopt hollow design, which can increase the maximum area when sliding on the well wall, reduce the overall loss of the outer surface of the hollow roller 333, and prolong the service life, at the same time, through the joint action of two bearings 3321 and two auxiliary parts 334, the flexibility of the plurality of hollow rollers 333 is ensured, through the joint cooperation of two groups of limiting inner rings 3341 and a plurality of tapered rollers 3344 and connecting outer rings 3343, two tapered bearings are formed, and the tapered heads of the two tapered bearings are outward, which can effectively avoid the phenomenon that the centralizer is stuck after entering the wellhead and cannot slide down along the well wall.

[0040] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A rigid spiral roller centralizer, comprising a positioning tube (1), characterized in that: The inner surface of the positioning tube (1) is fixedly connected with a connecting mechanism (2), and the outer surface of the positioning tube (1) is fixedly connected with four wear-resistant mechanisms (3); the connecting mechanism (2) includes a connecting tube (21), the outer surface of the connecting tube (21) is fixedly connected to the inner surface of the positioning tube (1), the inner surface of the connecting tube (21) is provided with an internal connecting thread (22), and the outer surface of the connecting tube (21) is provided with an external connecting thread (23); the wear-resistant mechanism (3) includes a straightening bar (31), the straightening bar (32) is provided with a connecting thread (23), and the straightening bar (33) is provided with a connecting thread (22). The inner surface of the straightening bar (31) is fixedly connected to the outer surface of the positioning tube (1); the outer surface of the straightening bar (31) is provided with two roller grooves (32); the left and right walls of the inner cavity of the two roller grooves (32) are both fixedly connected to a roller assembly (33); the roller assembly (33) includes a positioning rod (331); the left and right ends of the positioning rod (331) are respectively fixedly connected to the left and right walls of the inner cavity of the roller groove (32); the outer surface of the positioning rod (331) is fixedly connected to two support members (332) The two support members (332) are fixedly connected to a hollow roller (333) on the outside, and the inner surface of the hollow roller (333) is fixedly connected to two auxiliary members (334); the support member (332) includes a bearing (3321), the outer surface of the bearing (3321) is fixedly connected to a connecting ring (3322), the outer surface of the connecting ring (3322) is fixedly connected to a plurality of support blocks (3323), and the outer surfaces of the plurality of support blocks (3323) are fixedly connected to the bearing (3321). A connecting ring 2 (3324) is connected, and the outer surface of the connecting ring 2 (3324) is fixedly connected to a plurality of supporting blocks 2 (3325); the auxiliary component (334) includes a limiting inner ring (3341), the outer surface of the limiting inner ring (3341) is slidably connected to a retaining ring (3342), the outer surface of the limiting inner ring (3341) is slidably connected to a plurality of tapered rollers (3344), and the outer surfaces of the plurality of tapered rollers (3344) are slidably connected to a connecting outer ring (3343).

2. The rigid spiral roller centralizer according to claim 1, characterized in that: The inner surfaces of the two limiting inner rings (3341) are fixedly connected to the outer surface of the positioning rod (331), and the outer surfaces of the two connecting outer rings (3343) are fixedly connected to the inner surface of the hollow roller (333).

3. The rigid spiral roller centralizer according to claim 1, characterized in that: The outer surfaces of the plurality of support blocks (3325) are fixedly connected to the inner cavity of the hollow roller (333), and the inner surfaces of the two bearings (3321) are fixedly connected to the outer surface of the positioning rod (331).

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