Novel guiding shoe for hole opener

Abstract

The utility model provides a novel reamer guiding shoe, which belongs to the technical field of downhole tools in drilling engineering, and comprises a body, an inner cavity, a water hole, a wear-resistant block, a gauge protection block, a flow channel and a clamping groove, the inner cavity is arranged inside the body, the wear-resistant block and the gauge protection block are arranged outside the body, the wear-resistant block and the gauge protection block are uniformly distributed on the periphery of the upper part of the body, and meanwhile, the water hole is communicated with the flow channel. A runner is arranged between the wear-resistant block and the gauge protection block, a water hole is formed in the top of the body, a clamping groove is formed in the lower portion of the body, and meanwhile the water hole abuts against the top end of the wear-resistant block and is communicated with the inner cavity. The novel guiding shoe for the reamer is used in cooperation with the reamer, the reamer can be guided to stably conduct downward rock breaking and expanding, new boreholes are avoided, meanwhile, borehole rock debris can be effectively cleaned, and the borehole quality is guaranteed; the guide shoe is safe and reliable in structure, convenient to operate and implement, stable in performance, safe and efficient in operation and capable of guaranteeing smooth implementation of reaming operation, effectively solves the problem of pilot hole reaming, and improves the time efficiency of offshore operation.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole tools for drilling engineering, in particular to a novel reamer guide shoe. Background Technique

[0002] In the process of offshore oil and gas development, surface drilling often uses a drill bit to pre-drill a pilot hole first, and then uses a reamer to ream the surface hole so that the surface conductor can be smoothly lowered. In addition, before drilling to the target formation, a small-diameter pilot hole will also be pre-drilled to evaluate the formation conditions, and then a reamer is used to ream or sidetrack and fill the well section. The conventional reaming drill string assembly is a reamer paired with a drill bit or a simple guide shoe. When carrying the drill bit to ream, the drill string as a whole bears a large torsional stress, and there is a risk of drill string fracture. Moreover, the simple guide shoe has a single function and only plays a guiding role. There is no cuttings flow channel outside the tool, and the wellbore cleaning effect is not good. To solve the current technical defects, it is urgent to develop a novel reamer guide shoe to better match the reamer and ensure the wellbore quality. Content of the Utility Model

[0003] In view of this, the utility model aims to propose a novel reamer guide shoe, which is safe and reliable, convenient to operate and implement, can effectively reduce the operation risk, not only can play a guiding role, but also can clean the wellbore cuttings to ensure the smooth completion of the reaming operation.

[0004] To achieve the above object, the technical solution of the utility model is realized as follows: A novel reamer guide shoe includes a body, an inner cavity, water eyes, wear-resistant blocks, gauge blocks, a flow channel and a clamping groove. An inner cavity is arranged inside the body, and wear-resistant blocks and gauge blocks are arranged outside. The wear-resistant blocks and the gauge blocks are evenly distributed around the upper part of the body. At the same time, a flow channel is arranged between the wear-resistant blocks and the gauge blocks. Water eyes are arranged at the top of the body, and a clamping groove is arranged at the lower part. At the same time, the water eyes are close to the top ends of the wear-resistant blocks, and the water eyes are communicated with the inner cavity.

[0005] Further, three water eyes are evenly distributed at the top of the body, and the included angles between the three water eyes are 120 degrees to each other.

[0006] Further, the wear-resistant block is an integral structure, its top end is closed, and the tail end forks into three branches, and a gauge block is arranged between every two branches.

[0007] Further, three gauge blocks are evenly distributed around the body, and the included angles between the three gauge blocks are 120 degrees to each other.

[0008] Further, the wear-resistant blocks are evenly extended and distributed from the top of the body to the periphery of the body, and are inclined clockwise at an angle.

[0009] Further, the front end of the gauge block is an arc-shaped slope structure.

[0010] Furthermore, there are two card slots, symmetrically distributed at the lower part of the body.

[0011] Compared with the prior art, the novel reamer guide shoe of the present utility model has the following advantages:

[0012] (1) The novel reamer guide shoe of the present utility model is used in combination with a reamer. It can not only play a guiding role, guiding the reamer to break rock and expand the hole stably downward to avoid generating a new wellbore, but also effectively clean the cuttings in the wellbore to ensure the wellbore quality.

[0013] (2) The novel reamer guide shoe of the present utility model is an integrally processed structure. Its structure is reasonably designed, with a large flow area, stable operation, safety and reliability. At the same time, the present utility model is connected to the reamer by screwing on, without additional operations, and the operation is convenient, which can ensure the smooth implementation of the reaming operation, effectively solve the problem of pilot hole reaming, and improve the efficiency of offshore operations. Description of the Drawings

[0014] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0015] Figure 1 is a schematic structural diagram of the novel reamer guide shoe of the present utility model;

[0016] Figure 2 is a top view of the novel reamer guide shoe of the present utility model;

[0017] Figure 3 is Figure 2 the sectional view taken along the line A-A in

[0018] Figure 4 is an overall assembly drawing of the novel reamer guide shoe of the present utility model;

[0019] Figure 5 is an overall assembly bottom view of the novel reamer guide shoe of the present utility model.

[0020] Description of the Reference Numerals:

[0021] 1. Body; 2. Inner cavity body; 3. Nozzle; 4. Wear-resistant block; 5. Gauge block; 6. Flow channel; 7. Card slot; 8. Reamer; 9. Novel reamer guide shoe; 10. Thread structure. Detailed Embodiments

[0022] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0023] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] As Figures 1 - 5 shown, the present utility model is a novel reamer guide shoe, which includes a body 1, an inner cavity body 2, water holes 3, wear-resistant blocks 4, gauge blocks 5, a flow channel 6 and a clamping groove 7. An inner cavity body 2 is arranged inside the body 1, and wear-resistant blocks 4 and gauge blocks 5 are arranged outside. The wear-resistant blocks 4 and gauge blocks 5 are evenly distributed around the upper part of the body 1. At the same time, a flow channel 6 is arranged between the wear-resistant blocks 4 and the gauge blocks 5. Water holes 3 are arranged at the top of the body 1, and a clamping groove 7 is arranged at the lower part. There are two clamping grooves 7, which are symmetrically distributed at the lower part of the body 1 for clamping by a tool. The tool is a prior art. At the same time, outside the body 1, a thread structure 10 is arranged below the clamping groove 7. Through the thread structure 10, it can be quickly connected to the reamer without additional operations, and the operation is convenient. At the same time, the water holes 3 are close to the top end of the wear-resistant blocks 4, and the water holes 3 are communicated with the inner cavity body 2. Preferably, three water holes 3 are evenly distributed at the top of the body 1, and the included angles between the three water holes 3 are 120 degrees with each other. The inner diameters of the water holes 3 are large and are not easily blocked. At the same time, because the water holes 3 are close to the top end of the wear-resistant blocks 4, the hydraulic cleaning effect is good. In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0025] The wear-resistant block 4 is an integral structure, its top end is closed, and its tail end forks into three branches. This structure makes the top end of the novel reamer guide shoe of the present utility model smooth, and the resistance during its lowering process is small. The structure design of the forked tail end of the wear-resistant block 4 provides a fluid channel. A gauge block 5 is arranged between every two branches. Preferably, the wear-resistant block 4 extends evenly from the top of the body 1 to the periphery of the body 1 and inclines at a certain angle clockwise.

[0026] Three gauge blocks 5 are evenly distributed around the body 1, and the included angles between the three gauge blocks 5 are 120 degrees with each other. Since the novel reamer guide shoe of the present utility model is worn by the wellbore during rotation, its outer diameter will be slightly reduced. The existence of the gauge blocks 5 can ensure that the outer diameter of the novel reamer guide shoe does not decrease significantly, and ensure that the outer diameter wear of the novel reamer guide shoe is within an acceptable range. Preferably, the front end of the gauge block 5 is an arc slope structure to prevent local eddy currents from being generated when the fluid passes through.

[0027] During the actual working process, the novel reamer guide shoe 9 of the present utility model is used in combination with the reamer 8. First, the assembly of the novel reamer guide shoe 9 and the reamer 8 is completed at the wellhead position. The novel reamer guide shoe 9 and the reamer 8 can be connected through the threaded structure 10 without additional operations, which is convenient for operation implementation. When the connection between the novel reamer guide shoe 9 and the reamer 8 is completed, the water eye 3 is connected to the waterway of the reamer 8 through the inner cavity 2. During the actual operation process, to ensure the assembly efficiency, the novel reamer guide shoe 9 can be connected to the fixing tooling through the card slot 7 provided thereon. The fixing tooling can ensure that the novel reamer guide shoe 9 does not rotate during the threaded connection process with the reamer 8, so as to quickly realize the connection between the novel reamer guide shoe 9 and the reamer 8. The fixing tooling is an existing technology.

[0028] The novel reamer guide shoe 9 is installed at the top of the reamer 8. When reaming operations are required, the novel reamer guide shoe of the present utility model will be lowered into the pilot hole to guide the reamer 8 to ream downwards, ensuring that the reamer 8 can stably ream and break rocks downwards, avoiding the generation of a new wellbore. At the same time, the water eye 3 at the top of the novel reamer guide shoe 9 can spray water outwards. On the one hand, it can clean the wellbore, and on the other hand, it can clean and cool the cutter blades of the reamer 8. The flow channels 6 around the novel reamer guide shoe 9 provide a cuttings return channel for the cuttings. When the reamer 8 reams downwards, along with the rotation of the reamer 8, the cuttings generated by rock breaking can return upwards along the flow channels 6, which is conducive to the timely return of the cuttings and ensures the wellbore cleanliness. After the operation is completed, the novel reamer guide shoe 9 can be disassembled at the drill floor, and the operation implementation is convenient. The structure design of the novel reamer guide shoe of the present utility model is safe and reliable, with stable performance, safe and efficient operation, effectively solving the problem of pilot hole reaming and ensuring the wellbore quality.

[0029] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A new type of hole opener guide shoe, characterized in that: It includes a body (1), an inner cavity body (2), water holes (3), wear-resistant blocks (4), gauge blocks (5), a flow channel (6) and a clamping groove (7). An inner cavity body (2) is arranged inside the body (1), and wear-resistant blocks (4) and gauge blocks (5) are arranged outside. The wear-resistant blocks (4) and the gauge blocks (5) are evenly distributed around the upper part of the body (1). At the same time, a flow channel (6) is arranged between the wear-resistant blocks (4) and the gauge blocks (5). A water hole (3) is arranged at the top of the body (1), and a clamping groove (7) is arranged at the lower part. At the same time, the water hole (3) is close to the top end of the wear-resistant block (4), and the water hole (3) is communicated with the inner cavity body (2).

2. The novel hole opener guide shoe according to claim 1, characterized in that: Three water holes (3) are evenly distributed at the top of the body (1), and the included angles between the three water holes (3) are 120 degrees to each other.

3. The novel hole opener guide shoe according to claim 1, characterized in that: The wear-resistant block (4) is an integral structure, with its top end closed and its tail end bifurcated into three branches, and a gauge block (5) is arranged between every two branches.

4. A novel hole opener guide shoe according to claim 3, characterized in that: Three gauge blocks (5) are evenly distributed around the body (1), and the included angles between the three gauge blocks (5) are 120 degrees to each other.

5. The novel hole opener guide shoe according to claim 3, characterized in that: The wear-resistant block (4) extends uniformly from the top of the body (1) to the periphery of the body (1) and is inclined clockwise at an angle.

6. The novel hole opener guide shoe according to claim 4, wherein: The front end of the gauge block (5) is of an arc slope type structure.

7. A novel hole opener guide shoe according to claim 1, characterized in that: There are two clamping grooves (7), which are symmetrically distributed at the lower part of the body (1).

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