Self-guiding type guiding shoe
By designing self-guided guide shoes, the self-rotation function is achieved using the combination of mandrel, hanging ears, outer cylinder and compression spring, which solves the problem that tools are difficult to automatically adjust their trajectory during oilfield completion, and improves the success of tool entry rate and construction efficiency.
Patent Information
- Application Number
- CN202420384399.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-02-28
AI Technical Summary
During oilfield completion, it is difficult for existing tools to automatically adjust the trajectory in complex downhole environments, resulting in delays in completion work or scrapping of the wellbore.
A self-guided guide shoe is designed to achieve the self-rotation function through the combination of mandrel, hanging ears, outer cylinder and compression spring. The hanging ears are embedded in the rotating track, and the compression spring provides downward pressure, which converts into axial rotation force, driving the shoe to automatically rotate and find the best angle to introduce the sealing cylinder.
The device can automatically adjust the rotation angle of the shoe without rotating the pipe string, improve the success rate of tool insertion, simplify construction procedures, reduce tool damage risk, and speed up construction efficiency.
Smart Images
Figure CN222457379U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil field well completion equipment, in particular to a self-steering guide shoe. Background Art
[0002] In the field of downhole oilfield completion, the introduction tool is a relatively common and critical tool. In the process of downhole operations, except for open hole wells, most other situations will require the insertion of completion strings for construction operations. Under normal circumstances, the completion string can be smoothly lowered to the designed position, but for complex downhole environments, especially some special cases, the trajectory needs to be temporarily adjusted during the drilling process, which is not conducive to the subsequent completion work. At present, most of the tools on the market find the fitting point of the introduction by rotating the string, and the work procedures are complicated. It may not be possible to smoothly lower it to the planned position by consuming large amounts of manpower and material resources, causing construction delays, and even causing the wellbore to be scrapped in serious cases. Utility Model Content
[0003] The purpose of the utility model is to provide a self-guiding guide shoe to solve the problems raised in the above background technology.
[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0005] A self-guided guide shoe comprises: a core shaft, a hanging ear, an outer cylinder, a guide shoe and a compression spring; the outer diameter of the lower end of the core shaft is smaller than that of the upper end, a rotating track is provided on the lower end surface of the core shaft, the outer cylinder is sleeved on the lower end of the core shaft, a hanging ear is provided inside the outer cylinder, the hanging ear is embedded in the rotating track, the compression spring is sleeved on the lower end of the core shaft and is located between the outer cylinder and the upper end of the core shaft, and the guide shoe is installed at the lower end of the outer cylinder.
[0006] As a further embodiment of the utility model, there are at least two rotating tracks, which are evenly distributed on the lower end surface of the core shaft, and the outer cylinder is equipped with a number of hanging ears corresponding to the rotating tracks, and the hanging ears are respectively embedded in the multiple rotating tracks.
[0007] As a further embodiment of the present invention, an upper thread is provided on the outer surface of the upper end of the mandrel, and the upper thread is used to connect other tools or pipe strings.
[0008] As a further embodiment of the present invention, the outer tube and the hanging ear are designed to be separate bodies.
[0009] As a further embodiment of the present utility model, the hanging ear includes a fixed end and a movable end, both of which are cylindrical structures, the outer diameter of the fixed end is smaller than the outer diameter of the movable end, and the fixed end is coaxially fixedly connected with the movable end; a through hole is provided on the outer cylinder, the fixed end of the hanging ear is installed in the through hole, and the movable end is installed in the rotating track.
[0010] As a further embodiment of the utility model, the upper end of the rotating track is provided with an ear hole for installing the ear, and the ear hole is a through hole. When the through hole is aligned with the ear hole, the ear can pass through the ear hole and be connected to the through hole.
[0011] As a further embodiment of the present utility model, the hanging ear is further provided with a through-type threaded hole, and the threaded hole is used to be connected with the assembly threaded rod during installation.
[0012] As a further embodiment of the present invention, the movable end of the hanging ear is provided with a chamfer on the outside.
[0013] As a further embodiment of the present invention, the rotation angle of the rotating track is greater than 180 degrees.
[0014] As a further embodiment of the utility model, the lower end of the outer cylinder is further provided with a trapezoidal thread and a screw hole, the guide shoe is connected to the lower end of the outer cylinder via the trapezoidal thread, and the fastening screw passes through the screw hole to fasten the guide shoe.
[0015] The utility model is beneficial in that the self-steering guide shoe can be connected to the pipe column or other tools to be lowered through the upper thread, and introduced into the packer with the sealing tube through the guide shoe. The self-steering function is realized by compressing the spring, and the self-steering guide shoe is given downward pressure by its own gravity to compress the spring. While the spring is compressed, the downward pressure and gravity are converted into axial rotation force by the hanging ear and the rotating channel. The outer tube rotates to drive the guide shoe, realizing the automatic rotation function. This structure is tightly matched, and the pressure is converted through the effective cooperation of various components to achieve the self-rotation effect. The guide shoe can automatically find the best angle for introducing the sealing tube through different rotation angles. The difficulty coefficient of the construction operation is greatly reduced, it is not easy to cause damage to the tools or pipe column, the construction efficiency is accelerated, and the operation is simple.
[0016] Other features and advantages of the present invention will be disclosed in detail in the following specific implementations and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a cross-sectional view of a self-guiding guide shoe of the utility model;
[0018] Figure 2 yes Figure 1 A schematic diagram of the structure of the mandrel in FIG.
[0019] Figure 3 yes Figure 1 A schematic diagram of the structure of the mounting ear in FIG.
[0020] Figure 4 yes Figure 1 A schematic diagram of the structure of the outer cylinder in FIG.
[0021] List of reference numerals: core shaft 1, lug 2, outer tube 3, guide shoe 4, compression spring 5, fastening screw 6, upper thread 101, lug hole 102, rotating track 103, fixed end 201, movable end 202, threaded hole 203, chamfer 204, through hole 301, trapezoidal thread 302, screw hole 303. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] like Figures 1 to 4 As shown, a self-guided guide shoe comprises: a core shaft (1), a hanging ear (2), an outer cylinder (3), a guide shoe (4) and a compression spring (5); the outer diameter of the lower end of the core shaft (1) is smaller than that of the upper end, a rotating track (103) is provided on the lower end surface of the core shaft (1), the outer cylinder (3) is sleeved on the lower end of the core shaft (1), a hanging ear (2) is provided inside the outer cylinder (3), and the hanging ear (2) is embedded in the rotating track (103), the compression spring (5) is sleeved on the lower end of the core shaft (1) and is located between the outer cylinder (3) and the upper end of the core shaft (1), and the guide shoe (4) is installed at the lower end of the outer cylinder (3).
[0024] As a further embodiment of the utility model, there are at least two rotating tracks (103), and the rotating tracks (103) are evenly distributed on the lower end surface of the core shaft (1). A number of hanging ears (2) corresponding to the rotating tracks (103) are installed in the outer cylinder (3), and the hanging ears (2) are respectively embedded in the multiple rotating tracks (103).
[0025] As a further embodiment of the present invention, an upper end outer surface of the core shaft (1) is provided with an upper thread (101), and the upper thread (101) is used to connect other tools or a pipe string.
[0026] As a further embodiment of the present invention, the rotation angle of the rotating track (103) is greater than 180 degrees.
[0027] During construction, the thread (101) on the upper part of the mandrel is connected to the tail pipe. After the connection is completed, the tool string is lowered until it reaches the vicinity of the lower packer. At this time, the self-guided guide shoe may be blocked and unable to move. At this time, a downward pressure is transmitted or applied to the mandrel (1) to compress the compression spring (5). While the spring is compressed, the hanging ear (2) is squeezed by the elastic force of the compression spring (5) and slowly slides into the rotating channel (103). Through the limitation of the rotating track, the pressure is converted into an axial rotation force. At this time, the hanging ear (2) pulls the outer tube (3) and the guide shoe (4) to rotate, and the maximum rotation angle can reach 180°. Through the continuous rotation of the guide shoe, when a certain angle is reached, it can be introduced into the sealing tube of the packer. The device realizes the guidance of the tail pipe into the sealing tube of the packer without rotating the pipe string, and guides the tool to be safely and smoothly lowered to the designed position, solving the problem that the existing tool encounters resistance or cannot be smoothly lowered. It greatly simplifies the complicated procedures of previous construction operations and increases the probability of smooth lowering of tools. It has a rigorous structural design and is easy and convenient to operate.
[0028] As a further embodiment of the present utility model, the outer cylinder (3) and the hanging ear (2) are designed as separate bodies.
[0029] As a further embodiment of the utility model, the hanging ear (2) comprises a fixed end (201) and a movable end (202), the fixed end (201) and the movable end (202) are both cylindrical structures, the outer diameter of the fixed end (201) is smaller than the outer diameter of the movable end (202), and the fixed end (201) and the movable end (202) are coaxially fixedly connected; the outer cylinder (3) is provided with a through hole (301), the fixed end (201) of the hanging ear (2) is installed in the through hole (301), and the movable end (202) is installed in the rotating track (103).
[0030] As a further embodiment of the utility model, the upper end of the rotating track (103) is provided with a hanging ear hole (102) for installing the hanging ear (2), and the hanging ear hole (102) is a through hole. When the through hole (301) is aligned with the hanging ear hole (102), the hanging ear (2) can pass through the hanging ear hole (102) and be connected to the through hole (301).
[0031] As a further embodiment of the utility model, the hanging ear (2) is further provided with a through-type threaded hole (203), and the threaded hole (203) is used to be connected to the assembly threaded rod during installation.
[0032] The installation method is further described as follows: first insert the compression spring (5) into the core shaft (1), then insert the outer cylinder (3), use the spring compression tool (assembly tool) to press the outer cylinder (3) forward until the through hole (301) of the outer cylinder (3) is aligned with the ear hole (102) on the core shaft (1), use the assembly threaded rod to screw into the threaded hole (203) of the ear (2) and pull it so that it cannot fall down, then slowly release the compression tool to make the compression spring (5) rebound. At this time, the ear (2) is all stable on the rotating track (103), continue to release the compression tool, the compression spring (2) retreats until the outer cylinder reaches the final position, and remove the threaded rod. At this time, the core shaft (1) and the outer cylinder (3) are connected, and the compression spring (5) is well fixed.
[0033] As a further embodiment of the utility model, the movable end (202) of the hook (2) is provided with a chamfer (204) on the outside, the purpose of which is to facilitate it to move more smoothly on the rotating track without getting stuck under force.
[0034] As a further embodiment of the utility model, the lower end of the outer cylinder (3) is further provided with a trapezoidal thread (302) and a screw hole (303), the guide shoe (4) is connected to the lower end of the outer cylinder (3) via the trapezoidal thread (302), and the fastening screw (6) passes through the screw hole (303) to fasten the guide shoe (4). The trapezoidal thread (302) is designed for connecting the guide shoe (4), and the screw hole (303) is designed for fastening the set screw (6), which can strengthen the connection with the guide shoe (4) and prevent the lower trapezoidal thread (302) from loosening due to various circumstances during the rotation of the guide shoe (4), thereby avoiding some accidents and further ensuring the safety of the construction operation.
[0035] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A self-guided guide shoe, characterized in that: include: A core shaft (1), a hanging ear (2), an outer cylinder (3), a guide shoe (4) and a compression spring (5); The outer diameter of the lower end of the core shaft (1) is smaller than that of the upper end; a rotating track (103) is provided on the lower end surface of the core shaft (1); the outer cylinder (3) is sleeved on the lower end of the core shaft (1); a hanging ear (2) is provided inside the outer cylinder (3); the hanging ear (2) is embedded in the rotating track (103); the compression spring (5) is sleeved on the lower end of the core shaft (1) and is located between the outer cylinder (3) and the upper end of the core shaft (1); and the guide shoe (4) is installed at the lower end of the outer cylinder (3); The outer cylinder (3) and the hanging ear (2) are designed as separate parts; The hanging ear (2) comprises a fixed end (201) and a movable end (202); the fixed end (201) and the movable end (202) are both cylindrical structures; the outer diameter of the fixed end (201) is smaller than the outer diameter of the movable end (202); the fixed end (201) and the movable end (202) are coaxially fixedly connected; The outer cylinder (3) is provided with a through hole (301), the fixed end (201) of the hanging ear (2) is installed in the through hole (301), and the movable end (202) is installed in the rotating track (103); The upper end of the rotating track (103) is provided with a hanging ear hole (102) for mounting the hanging ear (2); the hanging ear hole (102) is a through hole; when the through hole (301) is aligned with the hanging ear hole (102), the hanging ear (2) can pass through the hanging ear hole (102) and be connected to the through hole (301).
2. A self-guided guide shoe according to claim 1, characterized in that: There are at least two rotating tracks (103), and the rotating tracks (103) are evenly distributed on the lower end surface of the core shaft (1). A number of hanging ears (2) corresponding to the rotating tracks (103) are installed in the outer cylinder (3), and the hanging ears (2) are respectively embedded in the plurality of rotating tracks (103).
3. A self-guided guide shoe according to claim 2, characterized in that: An upper thread (101) is provided on the outer surface of the upper end of the core shaft (1), and the upper thread (101) is used to connect other tools or a pipe string.
4. A self-guided guide shoe according to claim 3, characterized in that: The hanging ear (2) is also provided with a through-type threaded hole (203), and the threaded hole (203) is used to be connected to the assembly threaded rod during installation.
5. A self-guided guide shoe according to claim 4, characterized in that: The movable end (202) of the hanging ear (2) is provided with a chamfer (204) on the outside.
6. The self-guided guide shoe according to claim 1, characterized in that: The rotation angle of the rotating track (103) is greater than 180 degrees.
7. The self-guided guide shoe according to claim 1, characterized in that: The lower end of the outer cylinder (3) is also provided with a trapezoidal thread (302) and a screw hole (303); the guide shoe (4) is connected to the lower end of the outer cylinder (3) via the trapezoidal thread (302); and the screw hole (303) and the guide shoe (4) are fastened by a fastening screw (6).