Elastic centralizer for drill rod

Abstract

The utility model discloses an elastic centralizer for a drill rod, and belongs to the technical field of well cementation tools. The elastic centralizer for the drill rod further comprises a ball rotationally connected to the sliding rod. The inner side wall of each end cover is provided with an internal thread; each internal thread is in threaded connection with a sliding end block; a corrugated pipe is fixedly connected between the two sliding end blocks; by arranging the sliding end block and the corrugated pipe, the sliding end block is in threaded connection with the internal thread, the corrugated pipe can be compressed by rotating the sliding end block, the inner side wall of the corrugated pipe can abut against the sleeve after being compressed, the sleeve can be assisted to be centralized, the end cover can be assisted to be positioned, the centralizing effect is improved, and practicability is improved.

Description

Technical Field

[0001] This utility model belongs to the field of cementing tool technology, and more specifically, relates to a drill pipe elastic stabilizer. Background Technology

[0002] Currently, in cementing operations for oil and gas wells, the common practice is to first drill the well, then insert the casing, and then inject cement slurry into the casing. The cement slurry flows out from the bottom of the casing and then rises back up, filling the annular space between the casing and the wellbore. After solidification, the cementing operation is complete. During this process, it is crucial to ensure the casing is centered in the wellbore and to minimize deviation; therefore, a centralizer is used, which is fitted onto the outer wall of the casing. The process of filling with cement slurry is essentially the process of the cement slurry displacing the drilling fluid. Field experience shows that ensuring the casing is centered and that the cement slurry displaces the drilling fluid in a spiral flow during cementing is one of the effective ways to improve cementing displacement efficiency and cementing quality.

[0003] As described in patent application CN202223471159.0, a drill pipe elastic stabilizer for drilling tools includes an upper end cap and a lower end cap. Multiple positioning strips are fixedly connected between the upper and lower end caps. Two arc-shaped plates are fixedly installed on one side wall of each of the positioning strips. Two adjacent arc-shaped plates form a group. Arc-shaped grooves are formed on one side wall of each group of arc-shaped plates. Mounting plates are installed on one side wall of each arc-shaped groove. Two opposite mounting plates form a group. Fixing rods are fixedly connected between the groups of mounting plates. Multiple ball bearings are sleeved on the outer wall of each fixing rod. This drill pipe elastic stabilizer for drilling tools reduces friction against the well wall, facilitating drilling. Furthermore, it allows for arbitrary adjustment of the ball bearing positions based on the well diameter.

[0004] However, the aforementioned drill pipe elastic stabilizer for drilling tools still lacks practicality and is difficult to adapt to different sizes of sleeves. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a drill pipe elastic stabilizer, which improves practicality.

[0006] This utility model discloses a drill pipe elastic stabilizer, comprising end caps; two end caps are provided; six arc-shaped plates are fixedly connected to the outer sides of the two end caps; each arc-shaped plate has two symmetrically formed sliding grooves; a sliding rod is slidably connected to the inner side of each sliding groove; locking nuts are threaded to both sides of each sliding rod; each locking nut abuts against the end face of its nearest arc-shaped plate to fix the sliding rod; ball bearings are rotatably connected to the sliding rod; internal threads are provided on the inner sidewall of each end cap; a sliding end block is threaded to each internal thread; and a bellows is fixedly connected between two sliding end blocks.

[0007] Preferably, each end cap has six fastening bolts threaded on its outer side; the six pairs of fastening bolts correspond to the arc-shaped plates respectively; each fastening bolt is threaded to the nearest arc-shaped plate.

[0008] Preferably, the corrugated pipe is made of high-toughness stainless steel.

[0009] Preferably, each of the curved plates is made of high-toughness stainless steel.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] (1) By setting up a sliding end block and a bellows, the sliding end block is connected to the internal thread. By rotating the sliding end block, the bellows is compressed, and the inner wall of the bellows is compressed and can abut against the sleeve. When assisting in straightening the sleeve, the end cover can also be positioned to increase the straightening effect and improve practicality.

[0012] (2) By setting fastening bolts and cooperating with bellows, it can adapt to sleeves of different sizes, thus improving applicability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the corrugated pipe connection structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the end cap structure of this utility model.

[0016] The following are the labels in the diagram: 10. End cap; 11. Fastening bolt; 12. Arc plate; 13. Slide groove; 14. Locking nut; 15. Slide rod; 16. Sliding end block; 17. Ball bearing; 18. Bellows; 19. Internal thread. Detailed Implementation

[0017] Specific Implementation Example 1: Please refer to Figure 1-3A drill pipe elastic stabilizer includes end caps 10; two end caps 10 are provided; six arc-shaped plates 12 are fixedly connected to the outer sides of the two end caps 10; each arc-shaped plate 12 has two symmetrically formed sliding grooves 13; a sliding rod 15 is slidably connected to the inner side of each sliding groove 13; locking nuts 14 are threaded to both sides of each sliding rod 15; each locking nut 14 abuts against the end face of its nearest arc-shaped plate 12 to fix the sliding rod 15; and ball bearings 17 are rotatably connected to the sliding rod 15; each end cap... The inner wall of 10 is provided with an internal thread 19; each of the internal threads 19 is threadedly connected to a sliding end block 16; a bellows 18 is fixedly connected between two of the sliding end blocks 16; by setting the sliding end block 16 and the bellows 18, and by using the sliding end block 16 to be threadedly connected to the internal thread 19, the bellows 18 can be compressed by rotating the sliding end block 16, so that the inner wall of the bellows 18 can abut against the sleeve after being compressed, which can assist in straightening the sleeve and also assist in positioning the end cover 10, increasing the straightening effect and improving practicality.

[0018] Please see Figure 1 Each of the end caps 10 has six fastening bolts 11 threadedly connected to its outer side; the six pairs of fastening bolts 11 correspond to the arc-shaped plates 12 respectively; each of the fastening bolts 11 is threadedly connected to the nearest arc-shaped plate 12.

[0019] Please see Figure 1 The corrugated pipe 18 is made of high-toughness stainless steel.

[0020] Please see Figure 1 Each of the arc-shaped plates 12 is made of high-toughness stainless steel; by setting fastening bolts 11 and cooperating with corrugated pipes 18, it can adapt to sleeves of different sizes, thus improving applicability.

[0021] During operation, first place the sleeve, then put the end cap 10 on the outside of the sleeve, and press down the upper end cap 10 so that the two end caps 10 can cover both sides of the sleeve; rotate the two sliding end blocks 16 so that the inner wall of the bellows 18 after deformation can abut against the inner side of the sleeve.

[0022] At this time, tighten the head of the fastening bolt 11 so that the fastening bolt 11 can abut against the sleeve and fix the end cover 10 and the bellows 18. By loosening the locking nut 14, adjust the position of the slide rod 15. After adjusting the slide rod 15 to the corresponding position, tighten the locking nut 14. Then the end cover 10 and the bellows 18 will be covered on the outside of the sleeve.

[0023] During the drilling process, the ball bearing 17 can abut against the well wall, which can reduce the friction between the arc plate 12 and the well wall, and the arc plate 12 can be used to straighten and elastically support the drill string and the sleeve.

[0024] When disassembly is required, first loosen the fastening bolts 11 connected to the upper end cover 10, then turn the two sliding end blocks 16 to stretch the bellows 18, then loosen the sleeve from the bellows 18, and then loosen the fastening bolts 11 on the lower end cover 10 to completely remove the stabilizer.

[0025] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0026] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0027] The foregoing description presents and describes several preferred embodiments of this application. However, as mentioned above, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A drill pipe elastic stabilizer, comprising end caps (10); the number of end caps (10) is two; six arc-shaped plates (12) are fixedly connected to the outer sides of the two end caps (10); each arc-shaped plate (12) has two symmetrically formed sliding grooves (13); a sliding rod (15) is slidably connected to the inner side of each sliding groove (13); locking nuts (14) are threadedly connected to both sides of each sliding rod (15); each locking nut (14) abuts against the end face of its nearest arc-shaped plate (12) to fix the sliding rod (15); characterized in that, It also includes a ball (17) rotatably connected to the slide bar (15); an internal thread (19) is provided on the inner sidewall of each end cap (10); each internal thread (19) is threadedly connected to a sliding end block (16); a bellows (18) is fixedly connected between two sliding end blocks (16).

2. The drill pipe elastic stabilizer according to claim 1, characterized in that: Each of the end caps (10) has six fastening bolts (11) threaded on its outer side; the six pairs of fastening bolts (11) correspond to the arc plate (12) respectively; each of the fastening bolts (11) is threaded to the nearest arc plate (12).

3. The drill pipe elastic stabilizer according to claim 1, characterized in that: The corrugated pipe (18) is made of high-toughness stainless steel.

4. The drill pipe elastic stabilizer according to claim 1, characterized in that: Each of the aforementioned curved plates (12) is made of high-toughness stainless steel.

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