Back reaming device for cone

Abstract

The invention relates to the technical field of drilling equipment, in particular to a cone back reaming device, and aims to solve the technical problem that an existing back reaming tool easily causes new damage to a well wall in the back reaming process. The cone back reaming device comprises a reaming body and a reaming cone, the reaming cone comprises a fixing seat and a cone body, and cone teeth are arranged on the cone body; the reaming body is columnar; the fixing base is fixed to the side face of the reaming body. The cone body is rotationally connected with the fixing base so as to rotate around the axis of the cone body, and an included angle is formed between the axis of the cone body and the axis of the reaming body so that the tooth tips of the cone teeth located on the periphery can make contact with the well wall under the back reaming working condition. According to the cone back reaming device, rock falling blocks are broken and directional steps are trimmed through the impact crushing and shearing effects of the reaming cone, the well wall can be trimmed to the maximum extent during back reaming operation, the quality of the well wall is improved, the construction effect and risk are balanced, the construction difficulty is reduced, and the drilling efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and in particular to a roller cone reamer. Background Technology

[0002] During well development, irregular wellbore patterns can lead to high drilling friction torque, low drilling efficiency, and stuck pipe accidents caused by wellbore spalling or diameter reduction, resulting in prolonged handling times. To address this, the drill string is often raised and rotated simultaneously to reshape the wellbore; this process is called reaming.

[0003] The tools used in reverse reaming operations to break up debris, steps, and repair narrowed sections of the well wall are called reverse reaming tools. Currently, common reverse reaming tools are generally extremely rigid, which can cause new damage to the well wall when dealing with debris, steps, and repairing narrowed sections. In severe cases, it can even lead to secondary accidents such as stuck drill bits, thus rendering the entire wellbore unusable. Summary of the Invention

[0004] The purpose of this invention is to provide a roller cone re-reaming tool to alleviate the technical problem that existing re-reaming tools are prone to causing new damage to the well wall during the re-reaming process.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] The reamer provided by the present invention includes: a reamer body and a reamer toothed wheel, wherein the reamer toothed wheel includes a fixed base and a toothed wheel body, and the toothed wheel body has toothed wheel teeth;

[0007] The eye-cutting body is columnar;

[0008] The fixing base is fixed to the side of the eyelet body;

[0009] The roller cone body is rotatably connected to the fixed base so that it can rotate around its own axis, and its axis is set at an angle to the axis of the reaming body so that the tips of the roller cone teeth on the periphery can contact the well wall when reaming.

[0010] Furthermore, the eye-cutting body includes an integrally formed first connecting segment, a second connecting segment, and a third connecting segment;

[0011] The two ends of the second connecting segment are respectively fixed to the first connecting segment and the third connecting segment, and the diameter of the second connecting segment is smaller than the diameter of the first connecting segment and the third connecting segment;

[0012] The mounting base is fixed to the second connecting section.

[0013] Furthermore, the second connecting segment transitions to the third connecting segment via an inclined surface, and the fixing seat is fixed to the inclined surface.

[0014] Furthermore, the diameters of both the first connecting segment and the third connecting segment are smaller than the wellbore diameter;

[0015] The distance from the axis of the reaming body to the tip of the outer tooth of the roller is less than the wellbore radius.

[0016] Furthermore, the side of the third connecting section is welded with a wear-resistant strip, which extends around the axis of the squeegee body.

[0017] Furthermore, the wear-resistant strip is a PDC composite sheet, or a tungsten carbide wear-resistant protrusion, or a combination of a PDC composite sheet and a tungsten carbide wear-resistant protrusion.

[0018] Furthermore, the wear-resistant strip has a width of 2-3 cm and a thickness of 2-3 mm.

[0019] Furthermore, a female buckle is provided at the end of the first connecting segment away from the second connecting segment.

[0020] Furthermore, the third connecting segment has a male buckle at the end furthest from the second connecting segment.

[0021] Furthermore, the eyelet teeth are provided in multiple portions, and the multiple eyelet teeth are distributed at intervals along the circumference of the eyelet body.

[0022] In summary, the technical effects achieved by the toothed wheel reamer provided by this invention are as follows:

[0023] The roller cone reamer includes a reaming body and a reaming roller cone. The reaming roller cone includes a fixed seat and a roller cone body. The roller cone body has roller cone teeth. The reaming body is cylindrical. The fixed seat is fixed to the side of the reaming body. The roller cone body is rotatably connected to the fixed seat so that it can rotate around its own axis, and its axis is set at an angle with the axis of the reaming body so that the tips of the outermost roller cone teeth can contact the well wall during the reaming operation.

[0024] In this roller cone reamer, the reaming body rotates around its own axis, while the roller cones rotate synchronously. When the roller cone teeth rub against the well wall in the tangential direction, the roller cone body also rotates. During reaming, the reaming body rotates while being lifted. When the roller cone teeth act on rock fragments or well wall steps, single and double teeth of the roller cone alternately touch the ground. The static pressure load is superimposed with the dynamic vibration impact load, causing the roller cone teeth to impact and crush the rock fragments and well wall steps at high frequency and high speed. When the roller cone body rotates, the roller cone teeth slide on the surface of the rock fragments and steps, effectively breaking the rock fragments and steps through shearing and scraping action, repairing the well wall, and reducing the risk of stuck drill bit.

[0025] It can be seen that, compared with existing technologies, this roller cone reamer breaks up rock fragments and trims directional steps through the impact crushing and shearing action of the reaming roller cone. It can maximize the trimming of the well wall during reaming operations, improve the well wall quality, balance the construction effect and risk, reduce the construction difficulty, and improve drilling efficiency. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the toothed wheel reamer provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the eyelet roller provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram illustrating the application of the eyelet roller provided in an embodiment of the present invention.

[0030] Icons: 1-Eye-shaped body; 11-First connecting segment; 12-Second connecting segment; 13-Third connecting segment;

[0031] 2-Retracting gear; 21-Fixed seat; 22-Gear body; 221-Gear teeth;

[0032] 3-Abrasion-resistant belt. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] Currently, common reverse reaming tools are generally extremely rigid. When dealing with broken blocks, steps, or repairing reduced diameter sections, they can cause new damage to the well wall. In severe cases, they can even lead to secondary accidents such as stuck drill bits, thus rendering the entire wellbore unusable.

[0037] In view of this, the present invention provides a roller cone reamer, including a reamer body 1 and a roller cone 2. The roller cone 2 includes a fixed seat 21 and a roller cone body 22, wherein the roller cone body 22 has roller cone teeth 221; the reamer body 1 is columnar; the fixed seat 21 is fixed to the side of the reamer body 1; the roller cone body 22 is rotatably connected to the fixed seat 21 so that it can rotate around its own axis, and its axis is set at an angle with the axis of the reamer body 1 so that the tips of the roller cone teeth 221 on the periphery can contact the well wall during the reaming operation.

[0038] In this roller cone reamer, the reaming body 1 rotates around its own axis, while the roller cone 2 rotates synchronously. When the roller cone teeth 221 rub against the well wall in the tangential direction, the roller cone body 22 also rotates. During the reaming operation, the reaming body 1 is lifted and rotated simultaneously. When the roller cone teeth 221 act on the rock fragments or well wall steps, the single and double teeth of the roller cone alternately touch the ground. The static pressure load is superimposed with the dynamic vibration impact load, causing the roller cone teeth 221 to impact and crush the rock fragments and well wall steps at high frequency and high speed. When the roller cone body 22 rotates, the roller cone teeth 221 slide on the surface of the fragments and steps, effectively breaking the fragments and steps through shearing and scraping action, repairing the well wall, and making it less likely for the drill to get stuck.

[0039] It can be seen that, compared with the existing technology, this roller cone reamer breaks up rock fragments and trims directional steps through the impact crushing and shearing action of the reaming roller cone 2. It can trim the well wall to the maximum extent during reaming operations, improve the well wall quality, balance the construction effect and risk, reduce the construction difficulty, and improve drilling efficiency.

[0040] It should be added here that the reaming roller 2 is a flat roller, and in the reverse reaming condition, its outermost roller teeth 221 directly act on the rock.

[0041] The following combination Figures 1 to 3 The structure and shape of the toothed wheel reamer provided in this embodiment are described in detail:

[0042] In this embodiment, the eyelet body 1 adopts a dumbbell-shaped design, with thickened inner and outer joints at the top and bottom for high strength. Specifically, refer to... Figure 1The reaming body 1 is dumbbell-shaped and includes, from top to bottom, an integrally formed first connecting section 11, a second connecting section 12, and a third connecting section 13. The diameter of the second connecting section 12 is smaller than the diameters of the first connecting section 11 and the third connecting section 13, and the second connecting section 12 is connected to both the first connecting section 11 and the third connecting section 13 via beveled transitions. Furthermore, to facilitate connection with various types of drilling tools, the upper end of the first connecting section 11 is provided with a female thread for connection with the drill pipe, and the lower end of the third connecting section 13 is provided with a male thread for connection with the drill collar.

[0043] Following the above, and in conjunction with Figure 2 As shown, optionally, there are two reaming rollers 2, and two fixing seats 21 are fixed on the lower inclined surface and symmetrically distributed about the axis of the reaming body 1; at the fixing point of the reaming roller 2, the diameter of the roller reamer is smaller than the diameter of the third connecting section 13, and the maximum diameter of the reaming body 1, i.e. the diameter of the third connecting section 13, is smaller than the wellbore diameter.

[0044] By adopting the above design, the wear of the reaming cone 2 due to friction with the well wall can be avoided under drilling conditions, thereby extending the service life of the reaming cone 2.

[0045] Further reference Figure 1 The side of the third connecting section 13 is welded with a wear-resistant strip 3, which extends around the axis of the shaving body 1.

[0046] Preferably, the wear-resistant band 3 is designed as one or a combination of a PDC composite sheet (polycrystalline diamond compact) or a tungsten carbide wear-resistant protrusion. The width of the wear-resistant band 3 is 2-3 cm, specifically 2 cm, 2.5 cm, or 3 cm, and the thickness is 2-3 mm, specifically 2 mm, 2.5 mm, or 3 mm. This design can further extend the life of the toothed wheel reamer.

[0047] The working process of the toothed wheel reamer provided in this embodiment is as follows:

[0048] This roller cone reamer is integrated as a short section and connected to the upper part of the bottom reaming assembly (BHA) for well cleaning and reaming operations. During reaming, it is combined with... Figure 3 As shown, the single and double teeth of the roller cone 221 alternately touch the ground, vibrate longitudinally, and impact and crush rock fragments and well wall steps; when the roller cone 221 acts on the rock, the static pressure load is superimposed with the dynamic vibration impact load, causing the roller cone 221 to impact and crush the rock at high frequency and high speed; when the roller cone 221 rotates, it slides on the rock surface and effectively breaks the rock through shearing and scraping action.

[0049] This roller cone reamer is suitable for horizontal wells and other wells where the borehole diameter narrows during drilling. Compared to existing rigid reamers, it avoids severe cutting damage to the wellbore when breaking up blocks and steps. During reaming operations, it can maximize the repair of the wellbore, reduce friction, balance construction effect and risk, reduce construction difficulty, and improve drilling efficiency. In addition, the compact design can meet the requirements of reaming operations in highly deviated wells, long well sections of horizontal wells with long service times, and complex working conditions under severe cyclic pressure.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A roller back reamer, characterized by, The application relates to a roller reamer, which comprises a reamer body (1) and a roller (2), wherein the roller (2) comprises a fixing base (21) and a roller body (22), and the roller body (22) is provided with roller teeth (221). The reamer body (1) is in a columnar shape. The fixing base (21) is fixed to the side surface of the reamer body (1). The roller body (22) is rotationally connected with the fixing base (21) and can rotate around its own axis, and the axis of the roller body (22) is arranged at an angle with the axis of the reamer body (1) so that the tooth tip of the roller tooth (221) on the outer periphery can be in contact with the well wall in the condition of reverse reaming.

2. The roller reamer according to claim 1, wherein the reamer body (1) comprises an integrally formed first connecting section (11), a second connecting section (12) and a third connecting section (13). The two ends of the second connecting section (12) are fixed to the first connecting section (11) and the third connecting section (13) respectively, and the diameter of the second connecting section (12) is smaller than that of the first connecting section (11) and the third connecting section (13). The fixing base (21) is fixed to the second connecting section (12).

3. The roller reamer according to claim 2, wherein the second connecting section (12) is transitioned to the third connecting section (13) through a slope, and the fixing base (21) is fixed to the slope.

4. The roller reamer according to claim 3, wherein the diameters of the first connecting section (11) and the third connecting section (13) are both smaller than the diameter of the well hole. The distance from the axis of the reamer body (1) to the tooth tip of the roller tooth (221) on the outer periphery is smaller than the radius of the well hole.

5. The roller reamer according to claim 2, wherein the side surface of the third connecting section (13) is stacked with a wear-resistant band (3), and the wear-resistant band (3) extends around the axis of the reamer body (1).

6. The roller reamer according to claim 5, wherein the wear-resistant band (3) is a PDC composite piece, a tungsten carbide wear-resistant tab or a combination of a PDC composite piece and a tungsten carbide wear-resistant tab.

7. The roller reamer according to claim 6, wherein the width of the wear-resistant band (3) is 2-3 cm, and the thickness is 2-3 mm.

8. The roller reamer according to claim 2, wherein the end of the first connecting section (11) away from the second connecting section (12) is provided with a female buckle.

9. The roller reamer according to claim 8, wherein the end of the third connecting section (13) away from the second connecting section (12) is provided with a male buckle.

10. The roller reamer according to any one of claims 1-9, wherein a plurality of the rollers (2) are arranged and distributed along the circumference of the reamer body (1). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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