A friction-reducing, torque-reducing and vibration-reducing drill string protector stabilizer

Abstract

The utility model provides a kind of drill string protection stabilizer of reducing friction and reducing torque damping, by being provided with recess outside reducing friction and reducing torque sleeve and welding hard alloy strip, increase the wear resistance when reducing friction and reducing torque sleeve and well wall occur friction, simultaneously, reducing friction and reducing torque sleeve and centralizer body are embedded between non-metal interlayer, when drill string protection stabilizer and well wall occur collision, by non-metal interlayer absorption energy, slow down the vibration transmission to drill string that drill string protection stabilizer and well wall occur collision produce.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling technology, and in particular to a drill string protection stabilizer that reduces friction, torsion, and vibration. Background Technology

[0002] With the development of oil drilling technology, oil drilling is gradually moving towards complex wells such as deep wells, ultra-deep wells, and extended reach wells. As the well depth increases, the hardness of the bottom rock increases dramatically, and the rock drillability decreases significantly, causing the drill string to buckle and vibrate more severely. This poses a great challenge to the life of the drill string and the integrity of the wellbore. The application of conventional centralizers can reduce the buckling of the drill string to a certain extent and prevent the drill bit from deviating, but it cannot effectively alleviate the impact caused by the collision between the drill string and the well wall. Therefore, a tool that can reduce both the buckling of the drill string and the vibration caused by the collision between the drill string and the well wall is of great significance for improving the drilling efficiency of drilling machinery and extending the overall life of the drill string. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to solve the problems existing in the prior art. For example, the purpose of this utility model is to provide a friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer to solve the problem of drill string buckling, friction and collision between the drill string and the well wall, which causes premature fatigue failure of the drill string in the existing drilling technology.

[0004] To achieve the above objectives, this utility model provides a friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer, comprising: a stabilizer body, which is hollow inside and has a central through hole, and has a first step, a first mounting groove, and a second step sequentially provided on its surface, wherein the first mounting groove is located between the first step and the second step, and the stabilizer body has a male thread and a female thread at both ends respectively.

[0005] The friction-reducing and torsion-reducing sleeve is a hollow semi-cylindrical structure, and there are 2 of them. The two friction-reducing and torsion-reducing sleeves are combined and covered on the first mounting groove.

[0006] The friction-reducing and torsion-reducing sleeve forms a relative rotation structure with the centralizer body, and the first step and the second step provide axial restraint for the friction-reducing and torsion-reducing sleeve.

[0007] Furthermore, the outer surface of the friction-reducing and torque-reducing sleeve is provided with straightening ridges, and the straightening ridges are provided with a plurality of grooves and a plurality of guide grooves intersecting the grooves in sequence along the axial direction.

[0008] Furthermore, it also includes a non-metallic interlayer made of compressible elastic material, disposed between the friction-reducing and torsion-reducing sleeve and the centralizer body, with an annular array of V-shaped grooves on its inner surface.

[0009] Furthermore, the male thread is located at the upper end of the stabilizer body, and the female thread is located at the lower end of the stabilizer body, respectively for connecting the upper and lower parts of the drill string.

[0010] Furthermore, the number of straightening ridges is two, and their shape is either spiral or straight.

[0011] Furthermore, 2-6 carbide strips are welded into the groove, evenly distributed along the axis of the friction-reducing and torsion-reducing sleeve.

[0012] Furthermore, 2-5 of the flow guide channels are evenly distributed in a ring on a single straightening ridge.

[0013] Furthermore, the first and second steps of the stabilizer body are provided with a transition slope of 20°-45° at the connection between the drill string and the drill bit.

[0014] Furthermore, the non-metallic interlayer has 2-4 V-grooves.

[0015] Furthermore, it also includes a connecting plate, which is connected to the friction-reducing and torque-reducing sleeve by screws. The connecting plate is fitted into the first slot of the non-metallic interlayer to achieve circumferential positioning. The connecting plate is provided with four evenly distributed threaded holes.

[0016] Furthermore, the friction-reducing and torque-reducing sleeve has eight symmetrically arranged connecting screw holes at its four apex corners, which are detachably connected to the threaded holes of the connecting plate via screws.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. When the drill string protection stabilizer comes into contact with the well wall and rubs, the hard alloy strip on the friction-reducing and torque-reducing sleeve contacts the well wall first, increasing the wear resistance of the drill string protection stabilizer.

[0019] 2. When the drill string protection stabilizer collides and rubs against the well wall during rotation, the friction-reducing and torsion-reducing sleeve slides relative to the centralizer body, converting the sliding friction between the drill string protection stabilizer and the well wall into rolling friction, thus reducing the frictional force between the drill string protection stabilizer and the well wall. At the same time, the non-metallic interlayer installed between the centralizer body and the friction-reducing and torsion-reducing sleeve absorbs the impact, reducing the vibration caused by the collision between the drill string protection stabilizer and the well wall. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a half-section structure of a drill string protection stabilizer;

[0022] Figure 2 This is a schematic diagram of the AA section.

[0023] Figure 3 A schematic diagram of the structure of the friction-reducing and torque-reducing sleeve;

[0024] Figure 4 This is a structural schematic diagram of the connecting plate;

[0025] Figure 5 This is a schematic diagram of the structure of a non-metallic sandwich layer;

[0026] Figure 6 This is a schematic diagram of the structure of the centralizer body.

[0027] Explanation of key figure labels:

[0028] 1. Centralizer body; 11. Male threaded thread; 12. First step; 13. First mounting groove; 14. Second step; 15. Central through hole; 16. Female threaded thread;

[0029] 2. Friction-reducing and torque-reducing sleeve; 21. Straightening ridge; 22. Flow guide groove; 23. Groove; 24. Connecting screw hole;

[0030] 3. Non-metallic interlayer; 31. First slot; 32. V-groove;

[0031] 4. Connecting plate; 41. Threaded hole;

[0032] 5. Screws. Detailed Implementation

[0033] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Contents not described in detail in the embodiments of this utility model belong to the prior art known to those skilled in the art.

[0034] It should be noted that terms such as "first," "second," and "third" are merely for ease of description and distinction, and should not be interpreted as indicating or implying relative importance. Terms such as "up," "down," "front," "back," "left," "right," "inner," and "outer" are merely for ease of description and to establish relative orientations or positional relationships, and do not indicate or imply that the component referred to must have that specific orientation or position.

[0035] Exemplary Example 1

[0036] A friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer includes a stabilizer body with a hollow interior and a central through hole. The surface is provided with a first step, a first mounting groove, and a second step in sequence. The first mounting groove is located between the first step and the second step. The stabilizer body has a male thread and a female thread at both ends.

[0037] The friction-reducing and torsion-reducing sleeve is a hollow semi-cylindrical structure, and there are two of them. The two friction-reducing and torsion-reducing sleeves are combined and covered on the first mounting groove. The outer surface of the sleeve is provided with a straightening ridge. The straightening ridge is provided with multiple grooves along the axial direction and multiple guide grooves that are perpendicular or obliquely intersecting the grooves. The guide grooves can discharge fine rock cuttings in the drilling and prevent the tool from being blocked by rock cuttings.

[0038] A non-metallic interlayer, made of compressible elastic material, is disposed between the friction-reducing and torsion-reducing sleeve and the centralizer body, and its inner surface is provided with an annular array of V-shaped grooves.

[0039] A connecting plate connects the two friction-reducing and torsion-reducing sleeves with screws. The connecting plate is fitted into the hollow area formed by the first slot of the two non-metallic interlayers to achieve circumferential positioning of the non-metallic interlayers inside the friction-reducing and torsion-reducing sleeves.

[0040] The friction-reducing and torsion-reducing sleeve forms a relative rotation structure with the centralizer body, and the first step and the second step provide axial restraint for the friction-reducing and torsion-reducing sleeve.

[0041] In this exemplary embodiment, by providing the groove on the outside of the friction-reducing and torsion-reducing sleeve and welding a hard alloy strip, the wear resistance of the friction-reducing and torsion-reducing sleeve when it rubs against the well wall is increased. At the same time, the non-metallic interlayer is embedded between the friction-reducing and torsion-reducing sleeve and the centralizer body. Preferably, the non-metallic interlayer is made of rubber. When the drill string protection stabilizer collides with the well wall, the non-metallic interlayer absorbs energy and slows down the transmission of vibration generated by the collision between the drill string protection stabilizer and the well wall to the drill string.

[0042] In this exemplary embodiment, the male thread is disposed at the upper end of the stabilizer body, and the female thread is disposed at the lower end of the stabilizer body, respectively for connecting the upper and lower parts of the drill string.

[0043] The number of straightening ridges can be multiple, for example, two, and their shape can be spiral or straight.

[0044] In this exemplary embodiment, the groove is a cemented carbide groove, in which cemented carbide strips are welded, and 2-6 strips are evenly distributed along the axis of the friction-reducing and torsion-reducing sleeve. When the drill string protection stabilizer comes into contact with the well wall and rubs, the cemented carbide strips on the friction-reducing and torsion-reducing sleeve come into contact with the well wall first, thereby increasing the wear resistance of the drill string protection stabilizer.

[0045] In this exemplary embodiment, 2-5 flow channels are evenly distributed in a ring on a single straightening ridge.

[0046] In this exemplary embodiment, the first and second steps of the stabilizer body are provided with a transition slope of 20°-45° at the connection with the drill string.

[0047] In this exemplary embodiment, the number of V-grooves in the non-metallic interlayer is 2-4.

[0048] The connecting plate has four evenly distributed threaded holes; the friction-reducing and torque-reducing sleeve has eight symmetrically arranged connecting screw holes, which are detachably connected to the threaded holes of the connecting plate by screws. The screws are internal hexagon head screws.

[0049] Exemplary Example 2

[0050] Depend on Figure 1 , Figure 2 , Figure 6 As shown, a friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer mainly consists of a stabilizer body 1, a friction-reducing and torsion-reducing sleeve 2, a connecting plate 4, a non-metallic interlayer 3, and screws 5. The stabilizer body 1 is provided with a male thread 11, a first step 12, a first mounting groove 13, a second step 14, a central through hole 15, and a female thread 16. The male thread 11 is used to connect with the upper drill string. The first mounting groove 13 is located between the first step 12 and the second step 14. The first step 12 and the second step 14 are connected to the drill string portion of the drill string protection stabilizer via a slope, with the slope angle being 20° to 45°. The female thread 16 is used to connect with the lower drill string via a thread. The first step 12 and the second step 14 are used to axially limit the friction-reducing and torsion-reducing sleeve 2 and the non-metallic interlayer 3.

[0051] In this exemplary embodiment, as Figure 3As shown, the friction-reducing and torsion-reducing sleeve 2 is provided with a straightening ridge 21, a guide groove 22, a groove 23, and connecting screw holes 24; the friction-reducing and torsion-reducing sleeve 2 is a semi-circular structure cut along the diameter direction; the straightening ridges 21 are evenly distributed in a ring on the friction-reducing and torsion-reducing sleeve 2; there are two straightening ridges 21, and the shape of the straightening ridges 21 is spiral or straight; the first straightening ridge 21 is provided with a guide groove 22 and a groove 23; the guide grooves 22 are evenly distributed in a ring on the straightening ridge 21, and the number is 2 to 5; the grooves 23 are evenly distributed along the axial direction of the friction-reducing and torsion-reducing sleeve 2 on the straightening ridge 21, and the number is 2 to 6; hard alloy strips are welded in the grooves 23; when the drill string protection stabilizer comes into contact with the well wall and friction occurs, the hard alloy strips on the friction-reducing and torsion-reducing sleeve 2 contact the well wall first, increasing the wear resistance of the drill string protection stabilizer; the connecting screw holes 24 are symmetrically arranged on the friction-reducing and torsion-reducing sleeve 2, and the number is 8.

[0052] Furthermore, such as Figure 4 As shown, the connecting plate 4 is provided with evenly distributed threaded holes 41; the friction-reducing and torque-reducing sleeve 2 is connected to the connecting plate 4 by an internal hexagon screw 5, and is annularly wrapped around the first mounting groove 13, and can rotate relative to the first mounting groove 13.

[0053] Furthermore, such as Figure 5 As shown, the non-metallic interlayer 3 is provided with symmetrically arranged first slots 31 and annular array of V-shaped grooves 32; the non-metallic interlayer 3 adopts a semi-circular structure cut along the diameter direction; the non-metallic interlayer 3 is installed between the friction-reducing and torsion-reducing sleeve 2 and the centralizer body 1; the connecting plate 4 is installed in the first slot 31 to achieve circumferential fixation between the non-metallic interlayer 3 and the friction-reducing and torsion-reducing sleeve 2; the V-shaped grooves 32 are arranged in annular array on the inner surface of the non-metallic interlayer 3; the number of V-shaped grooves 32 is 2 to 4; drilling fluid can enter the V-shaped grooves 32. During rotation, since the non-metallic interlayer 3 is installed between the friction-reducing and torsion-reducing sleeve 2 and the centralizer body 1, when the friction-reducing and torsion-reducing sleeve 2 rotates, the non-metallic interlayer 3 and the connecting plate 4 will rub against each other. With long-term rotation, this friction will generate gaps, allowing drilling fluid to flow into the V-shaped grooves 32. Then, when relative sliding occurs between the non-metallic interlayer 3 and the centralizer body 1, it plays a role in lubrication and cooling.

[0054] When the drill string protection stabilizer collides and rubs against the well wall during rotation, the friction-reducing and torsion-reducing sleeve 2 slides relative to the centralizer body 1, converting the sliding friction between the drill string protection stabilizer and the well wall into rolling friction, thus reducing the friction between the drill string protection stabilizer and the well wall. At the same time, the non-metallic interlayer 3 installed between the centralizer body 1 and the friction-reducing and torsion-reducing sleeve 2 absorbs the impact and reduces the vibration caused by the collision between the drill string protection stabilizer and the well wall.

[0055] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should fall within the protection scope of the present utility model's technical solution.

Claims

1. A friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer, characterized in that, include: The body of the stabilizer (1) has a hollow interior with a central through hole (15) and a first step (12), a first mounting groove (13) and a second step (14) arranged sequentially on its surface. The first mounting groove (13) is located between the first step (12) and the second step (14). The two ends of the body of the stabilizer (1) are respectively provided with a male thread (11) and a female thread (16). The friction-reducing and torsion-reducing sleeve (2) is a hollow semi-cylindrical structure, and there are 2 of them. The two friction-reducing and torsion-reducing sleeves (2) are combined and covered on the first mounting groove (13). The outer surface of the sleeve is provided with a straightening ridge (21). The straightening ridge (21) is provided with a plurality of grooves (23) and a plurality of guide grooves (22) intersecting with the grooves (23) in sequence along the axial direction. The non-metallic interlayer (3) is made of compressible elastic material and is disposed between the friction-reducing and torsion-reducing sleeve (2) and the centralizer body (1). Its inner surface is provided with annular array of V-shaped grooves (32). The friction-reducing and torsion-reducing sleeve (2) and the centering device body (1) form a relative rotation structure, and the first step (12) and the second step (14) provide axial limit for the friction-reducing and torsion-reducing sleeve (2).

2. The friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer according to claim 1, characterized in that: The male thread (11) is located at the upper end of the stabilizer body (1), and the female thread (16) is located at the lower end of the stabilizer body (1), respectively used to connect the upper and lower parts of the drill string.

3. The friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer according to claim 1, characterized in that: The number of the straightening ribs (21) is 2, and their shape is either spiral or straight.

4. The friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer according to claim 1, characterized in that: The groove (23) is a hard alloy groove, and hard alloy strips are welded inside it, with 2-6 strips evenly distributed along the axis of the friction-reducing and torque-reducing sleeve (2).

5. The friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer according to claim 1, characterized in that: The guide grooves (22) are evenly distributed in a ring on a single straightening ridge (21) in 2-5 places.

6. The friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer according to claim 1, characterized in that: The first step (12) and the second step (14) of the centralizer body (1) are provided with a transition slope of 20°-45° at the connection with the drill string.

7. The friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer according to claim 1, characterized in that: The number of V-grooves (32) in the non-metallic interlayer (3) is 2-4.

8. The friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer according to claim 1, characterized in that: It also includes a connecting plate (4), which is connected to the friction-reducing and torque-reducing sleeve (2) by screws (5). The connecting plate (4) is fitted into the first slot (31) of the non-metallic interlayer (3) to achieve circumferential positioning. The connecting plate is provided with four evenly distributed threaded holes (41).

9. The friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer according to claim 8, characterized in that: The friction-reducing and torque-reducing sleeve (2) has eight symmetrically arranged connecting screw holes (24) at its four apex corners, which are connected to the threaded holes (41) of the connecting plate (4) by screws (5) to form a detachable connection.

10. The friction-reducing, torsion-reducing, and vibration-damping drill string protection stabilizer according to claim 8, characterized in that, The screw (5) is an internal hexagon screw.

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