一种井下机械弹簧式柔性磨鞋结构
By introducing mechanical elastic elements and limiting mechanisms into the milling tool, the problem of unstable downpressure in downhole milling operations was solved, achieving constant thrust of the milling tool, preventing tooth breakage, and improving efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUIZHOU GAOFENG GASOLINEEUM MACHINERY
- Filing Date
- 2025-06-20
- Publication Date
- 2026-07-17
AI Technical Summary
In downhole milling operations, the downpressure of the milling tool is unstable, resulting in low milling efficiency and easy tooth breakage. Existing technologies cannot provide constant downpressure to prevent tooth breakage and improve efficiency.
A flexible, spring-loaded grinding shoe structure for downhole machinery is designed. By setting up a mechanical elastic element installation chamber between the milling head and the top joint, and installing the mechanical elastic element, the reverse force is buffered by the elastic principle to maintain a constant milling thrust. Combined with a limiting mechanism and a torque transmission mechanism, stable operation of the milling tool is achieved.
It effectively prevents tooth breakage during milling, while improving milling efficiency, providing relatively constant downward pressure, protecting milling tools, and improving work efficiency.
Smart Images
Figure CN224515149U_ABST
Abstract
Claims
1. A downhole mechanical spring flexible shoe structure, characterized by: It includes a milling head (1), which is movably connected to the top connector (2) with their inner holes communicating with each other. The end of the inner hole of the milling head (1) is connected to the outside through the inner hole end face (3). A torque transmission mechanism (4) is provided at the movable connection between the milling head (1) and the top connector (2). A mechanical elastic element installation chamber is formed between the inner hole step surface of the milling head (1) on the left side of the torque transmission mechanism (4) and the outer circular step surface of the top connector (2). A mechanical elastic element (5) is sleeved on the outer periphery of the top connector (2) at the mechanical elastic element installation chamber. A limit mechanism is also provided on the milling head (1) and the top connector (2) on the right side of the torque transmission mechanism (4).
2. A downhole mechanical spring shoe structure as defined in claim 1, wherein: The limiting mechanism includes a limiting screw (6) that passes through the cylinder wall of the milling head (1). The bottom end of the limiting screw (6) extends into a groove (7) provided on the outer periphery of the middle part of the top connector (2). The length of the groove (7) is greater than the diameter of the limiting screw (6).
3. A downhole mechanical spring shoe structure as defined in claim 1, wherein: The torque transmission mechanism (4) includes a rib (8) on the outer periphery of the top connector (2), and the rib (8) is inserted into a groove (9) on the inner wall of the milling head (1).
4. A downhole mechanical spring shoe structure as defined in claim 1, wherein: The outer periphery of the middle part of the milling head (1) is an outward protrusion structure. The protrusion structure is a triangular structure, and the three corners of the triangular structure are provided with intermittent straightening outer circles (10).
5. A downhole mechanical spring shoe structure as defined in claim 1, wherein: A sealing element (11) is engaged on the inner wall of the milling head (1) on the right side of the limiting mechanism, and a sealing element (11) is engaged on the inner wall of the mechanical elastic element (5) on the left side.
6. A downhole mechanical spring shoe structure as defined in claim 1, wherein: The mechanical elastic element (5) is a spring.