Anti-abrasion and anti-drag tool

Abstract

The invention discloses an anti-abrasion and anti-drag tool, which relates to the field of anti-abrasion and anti-drag of underground casing pipes and drill rods, and structurally comprises an outer sleeve, a fixed sleeve, an anti-drag gasket, a baffle ring and a fastener, the anti-drag gasket and the check ring are connected with the outer sleeve in a bonding mode, and other components are connected in a screw fastening mode. When the drill rod rotates, the anti-abrasion and anti-drag tool can convert friction between the drill rod and a casing pipe or between the drill rod and a well wall into mutual friction between the fixing sleeve and the anti-drag gasket, so that the casing pipe and the drill rod are protected, the friction coefficient can be reduced, and the drilling load is reduced; and meanwhile, the baffle ring can further effectively prevent external hard rock debris particles from entering the interior through a gap at the joint of the fixing sleeve to aggravate the abrasion of the friction pair.

Description

Technical Field

[0001] The present invention relates to the field of anti-wear and drag reduction of downhole casing and drill pipes, and particularly to an anti-wear and drag reduction tool. Background Art

[0002] The statements in this section only provide background information related to the present disclosure and may not constitute prior art.

[0003] With the continuous development of the manufacturing process of drill pipes, the main cause of drill pipe failure during drilling has become the wear between the drill pipe and the casing, rather than the process defects of the drill pipe itself. In recent years, drilling technology has been continuously developing, and operations in deep wells, extended reach wells, horizontal wells, and three-dimensional directional wells have become more and more extensive. However, at the same time, due to reasons such as the increase in well depth, the extension of the drilling cycle, and the complexity of the wellbore trajectory, the abrasion resistance and friction between the drill pipe and the casing are also increasing. At this time, an anti-wear and drag reduction tool is needed to reduce the abrasion resistance and friction between the drill pipe and the casing.

[0004] Existing anti-wear and drag reduction tools include drill pipe protection sleeves, anti-wear joints and other tools, and there are also those that weld anti-wear bands on the drill pipe joints. The drill pipe protection sleeve is usually made of materials such as rubber. Although the drill pipe protection sleeve can protect the drill pipe from wear and friction, there is still relative movement between the protection sleeve and the casing, resulting in frictional wear. The anti-wear joint is equivalent to adding an additional joint, and the relationship between the joint body and the thread of the drill string needs to be considered, resulting in more uncertain factors. The main material used for welding the anti-wear band is tungsten-cobalt series hard alloy. Although this alloy is wear-resistant and can well protect the drill pipe, there are also great drawbacks, such as relatively serious wear on the casing. However, although some other tools can better protect the drill pipe, they cannot be used in special situations, such as in the open hole section. In addition, although some tools prevent the wear between the drill pipe and the casing, they cannot prevent external hard cuttings from entering the tool and causing wear to the drill pipe. Summary of the Invention

[0005] The purpose of the present invention is: in order to effectively address the problems and challenges in drilling operations such as deep wells, extended reach wells, and horizontal wells, and better protect the drill pipe and the casing, an anti-wear and drag reduction tool is proposed. This anti-wear and drag reduction tool does not require a joint. The inner fixed sleeve firmly holds the drill pipe and rotates with the drill pipe. The outer sleeve part is fixed, and there is a layer of drag reduction gasket in the middle. This anti-wear and drag reduction tool changes the wear between the drill pipe and the casing into the wear between the inner fixed sleeve and the drag reduction gasket, preventing the drill pipe and the casing from being worn and better protecting the drill pipe and the casing; elastic retaining pieces are bonded on the outer sleeve, which can prevent external hard cuttings from entering the tool and wearing the drill pipe; slopes are provided on both sides of the outer sleeve, allowing the tool to be used in the open hole section.

[0006] The technical solution of the present invention is as follows:

[0007] A wear and drag reduction tool, comprising:

[0008] Two symmetrically arranged fixing sleeves, drag reducing gaskets and outer sleeve assemblies;

[0009] The fixing sleeve holds the drill pipe tightly by means of circumferentially distributed bolts and leaves a radial gap;

[0010] The outer sleeve assembly is composed of two semicircular outer sleeves connected by end bolts; the drag reduction gasket is bonded to the inner wall of the outer sleeve; and the outer surface of the fixed sleeve forms rotational friction with the drag reduction gasket.

[0011] Furthermore, it also includes: two retaining rings; the two retaining rings are respectively arranged on both sides of the inner wall of the outer sleeve and maintain an axial distance with the drag reduction gasket.

[0012] Furthermore, the two retaining rings are respectively bonded to two sides of the inner wall of the outer sleeve and maintain an axial distance with the drag reduction gasket.

[0013] Furthermore, a radial cut-out portion is provided at the butt-jointed end of the fixing sleeve.

[0014] Furthermore, the drag reducing gasket is made of high-strength non-metallic low-friction coefficient material.

[0015] Furthermore, the cross section of the retaining ring is an L-shaped structure, the vertical side of which is bonded to the inner wall of the outer sleeve, and the horizontal side extends to the assembly gap between the fixing sleeve and the outer sleeve.

[0016] Furthermore, the fixing sleeve and the outer sleeve are made of metal wear-resistant material.

[0017] Furthermore, the retaining ring is made of elastic material.

[0018] Furthermore, six connection points are evenly distributed around the fixed sleeve, and eight connection points are evenly distributed around the end of the outer sleeve, and each connection point is connected by bolts.

[0019] Furthermore, the bolts are all sleeved with gaskets.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides an anti-wear and drag reduction tool, which has a simple structure, is convenient to install and replace. Structurally, it includes an outer sleeve, a fixing sleeve, a drag reduction gasket, a retaining ring and fasteners; the drag reduction gasket and the retaining ring are connected to the outer sleeve by bonding, and the other components are connected by screwing. The materials of the fixing sleeve, the outer sleeve and the connecting fasteners are metal wear-resistant materials, making the structure safe and reliable. The drag reduction gasket is a high-strength non-metallic low-resistance material, and the retaining ring is an elastic material; when the fixing sleeve is processed, a part is cut off on both sides, so that the fixing sleeve can better hold the drill pipe during installation, aiming to prevent the anti-wear and drag reduction tool from shifting and enhance the structural strength and reliability of the tool; the drag reduction gasket is bonded to the middle part of the outer sleeve. When the drill pipe rotates, this anti-wear and drag reduction tool can convert the friction between the drill pipe and the casing or between the drill pipe and the well wall into the mutual friction between the fixing sleeve and the drag reduction gasket, protecting the casing and the drill pipe and reducing the friction coefficient and the drilling load; the retaining ring is bonded to both sides inside the outer sleeve and is at a certain distance from the drag reduction gasket. This retaining ring can effectively prevent external hard cuttings from entering the inside through the gap at the connection of the fixing sleeve, aggravating the wear of the friction pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is an explosion diagram of an anti-wear and drag reduction tool;

[0023] Figure 2 FIG. is a structural diagram of an anti-wear and drag reduction tool.

[0024] Reference numerals: 1 - fixing sleeve, 2 - drag reduction gasket, 3 - outer sleeve, 4 - bolt, 5 - retaining ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0026] The features and performance of the present invention will be further described in detail below in conjunction with the embodiments.

[0027] Embodiment 1

[0028] Please refer to Figure 1 and Figure 2, an anti-wear and drag reduction tool, comprising:

[0029] Two symmetrically arranged fixing sleeves 1, drag reduction gaskets 2 and outer sleeve assemblies;

[0030] The fixing sleeve 1 holds the drill pipe tightly through circumferentially distributed bolts 4 with a radial gap left; that is, the two fixing sleeves 1 surround and fix the drill pipe to prevent the anti-wear and drag reduction tool from shifting and enhance the structural strength reliability of the tool;

[0031] The outer sleeve assembly is composed of two semi-circular outer sleeves 3 connected by end bolts 4; the drag reduction gasket 2 is bonded to the inner wall of the outer sleeve 3; the outer surface of the fixing sleeve 1 forms a rotational friction with the drag reduction gasket 2;

[0032] That is, when the drill pipe rotates, this anti-wear and drag reduction tool can convert the friction between the drill pipe and the casing or between the drill pipe and the wellbore into the mutual friction between the fixing sleeve 1 and the drag reduction gasket 2, protecting the casing and the drill pipe and being able to reduce the friction coefficient and the drilling load.

[0033] In this embodiment, specifically, it further includes: two retaining rings 5; the two retaining rings 5 are respectively arranged on both sides of the inner wall of the outer sleeve 3 and keep an axial distance from the drag reduction gasket 2; specifically, the two retaining rings 5 are respectively bonded to both sides of the inner wall of the outer sleeve 3 and keep an axial distance from the drag reduction gasket 2;

[0034] In this embodiment, specifically, the cross-section of the retaining ring 5 is in an L-shaped structure, its vertical side is bonded to the inner wall of the outer sleeve 3, and the horizontal side extends to the assembly gap between the fixing sleeve 1 and the outer sleeve 3; that is, the retaining ring 5 is bonded to both sides inside the outer sleeve 3 and is at a certain distance from the drag reduction gasket 2, and this retaining ring 5 can effectively prevent external hard rock debris particles from entering the interior through the gap at the connection of the fixing sleeve 1 and aggravating the wear of the friction pair;

[0035] That is, the retaining ring 5 bonded to the outer sleeve 3 can effectively prevent external hard rock debris particles from entering the interior through the gap at the connection of the fixing sleeve 1 and aggravating the wear of the friction pair.

[0036] In this embodiment, specifically, the butt end of the fixing sleeve 1 is provided with a radially cut-off part; that is, when the fixing sleeve 1 is processed, a part is cut off on both sides to form a gap, so that the fixing sleeve 1 can better hold the drill pipe when installed, aiming to prevent the anti-wear and drag reduction tool from shifting and enhance the structural strength reliability of the tool.

[0037] In this embodiment, specifically, the drag reduction gasket 2 is made of a high-strength non-metallic material with a low friction coefficient.

[0038] In this embodiment, specifically, the fixing sleeve 1 and the outer sleeve 3 are made of metal wear-resistant materials to make the structure safe and reliable.

[0039] In this embodiment, specifically, the retaining ring 5 is made of an elastic material.

[0040] In this embodiment, specifically, six connection points are evenly distributed circumferentially on the fixed sleeve 1, and eight connection points are evenly distributed at the end of the outer sleeve 3. Each connection point is connected by a bolt 4.

[0041] In this embodiment, specifically, gaskets are sleeved on the bolts 4.

[0042] The above-described embodiments merely represent the specific implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation to the protection scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the technical solution of the present application, several deformations and improvements can still be made, and these all fall within the protection scope of the present application.

[0043] This background art section is provided to generally present the context of the present invention. The work of the currently named inventors, to the extent described in this background art section, and aspects of the work that are not prior art as of the time of filing this application are neither expressly nor impliedly admitted to be prior art to the present invention.

Claims

1. An anti-wear and drag reduction tool, characterized in that, include: Two symmetrically arranged fixing sleeves (1), a drag reducing gasket (2) and a jacket assembly; The fixing sleeve (1) holds the drill pipe tightly with circumferentially distributed bolts (4) and leaves a radial gap; The outer sleeve assembly is composed of two semicircular outer sleeves (3) connected by end bolts (4); the drag reduction gasket (2) is bonded to the inner wall of the outer sleeve (3); and the outer surface of the fixed sleeve (1) forms rotational friction with the drag reduction gasket (2).

2. The anti-wear and drag reduction tool according to claim 1, characterized in that, Also includes: Two retaining rings (5); the two retaining rings (5) are respectively arranged on both sides of the inner wall of the outer sleeve (3) and maintain an axial distance with the drag reduction gasket (2).

3. The anti-wear and drag reduction tool according to claim 2, wherein, The two retaining rings (5) are respectively bonded to the two sides of the inner wall of the outer sleeve (3) and maintain an axial distance with the drag reduction gasket (2).

4. The anti-wear and drag reduction tool according to claim 1, characterized in that, The butt-jointed end of the fixing sleeve (1) is provided with a radial cut-off portion.

5. A wear and drag reduction tool according to claim 1, characterized in that, The drag-reducing gasket (2) is made of a high-strength non-metallic material with a low friction coefficient.

6. The anti-wear and drag reduction tool according to claim 2, wherein The cross section of the retaining ring (5) is an L-shaped structure, the vertical side of which is bonded to the inner wall of the outer sleeve (3), and the horizontal side extends to the assembly gap between the fixing sleeve (1) and the outer sleeve (3).

7. A wear and drag reduction tool according to claim 1, characterized in that The fixing sleeve (1) and the outer sleeve (3) are made of metal wear-resistant material.

8. The anti-wear and drag reduction tool according to claim 2, characterized in that, The retaining ring (5) is made of elastic material.

9. A wear prevention and drag reduction tool according to claim 1, characterized in that, Six connection points are evenly distributed in the circumferential direction of the fixed sleeve (1), and eight connection points are evenly distributed at the end of the outer sleeve (3), and each connection point is connected by a bolt (4).

10. A wear and drag reduction tool according to claim 8, characterized in that, The bolts (4) are all sleeved with gaskets.

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