Pivot Lever Brush for Casing Diameter Tolerance
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Solution Overview
Problem
Existing downhole brush tools have limited tolerance to diameter variations in tubing or casing, relying on flexibility of bristles or tool design, which restricts their adaptability and effectiveness in cleaning or honing operations.
Innovation Solution
A downhole tool featuring a pivotably mounted lever arm with a brush at its end, driven outwardly to press against the casing or tubing wall, allowing for adjustable reach and rotation, utilizing well fluids or an actuator for outward force, and optionally featuring multiple sub-arms for angle compensation and parallel displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a downhole brush tool relies on flexibility of bristles to adapt to diameter variations, then the tool can accommodate some size variations, but the tolerance to diameter variations remains limited
Solution Approach 1:
The brush tool employs a dynamic lever arm mechanism that can pivot and adjust its position automatically in response to diameter variations in the tubing or casing. This dynamic adjustment capability allows the brush to maintain effective contact with the wall across a wide range of diameters while preserving cleaning reliability through controlled mechanical motion rather than relying solely on passive bristle flexibility
2Adaptability or versatility
If a downhole brush tool relies on fixed design to maintain structural integrity, then the tool is mechanically stable, but the adaptability to different diameter variations is restricted
Solution Approach 1:
The brush tool is divided into modular components including a support structure, a pivotable lever arm, and a brush assembly. This segmentation allows each component to perform its specific function independently while contributing to the overall adaptability, enabling the tool to handle diameter variations without requiring complete redesign of the entire structure
Solution Approach 2:
The lever arm is designed to pivot dynamically around the tubing or casing, transforming the fixed design into a semi-dynamic structure that automatically adapts to different diameters. This dynamic element adds minimal complexity while significantly improving adaptability to diameter variations
3Ease of operation
If the brush is mounted directly to the support, then the tool structure is simple, but the reach and adjustment capability are limited
Solution Approach 1:
The lever arm mechanism provides dynamic reach adjustment by allowing the brush to move outward and rotate as needed. The pivotable connection enables the brush to follow the contour of the tubing or casing, improving operational ease for cleaning different sections while adding only a single pivot joint to the overall structure
Solution Approach 2:
The lever arm extends the brush reach in a radial dimension outward from the central support, and the pivot capability adds rotational freedom. This dimensional extension allows the brush to access areas that would be unreachable with a direct mounting configuration without proportionally increasing structural complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tool achieves a high tolerance for diameter variations, enabling a single size to fit various casing or tubing sizes, ensuring effective brushing or honing by maintaining brush contact and allowing for both cleaning and honing operations.
Implementation Method 1
utilizing well fluids or an actuator for outward force
Implementation Method 2
utilizing well fluids or an actuator for outward force
Implementation Method 3
allowing for adjustable reach and rotation
Data Source
AI summary
The invention relates to a downhole tool (10) for use in a casing or tubing (99) in a well comprising a support (15) and a brush (12). The downhole tool (10) further comprises a lever arm (13) having a first end (13-1) and a second end (13-2) opposite the first end (13-1). The lever arm (13) is pivotably mounted to the support (15) and the brush (12) is mounted at the second end (13-2) of the lever arm (13). A driver means is provided for driving the lever arm (13) outwardly to press the brush against a wall of the casing or tubing (99) in operational use of the downhole tool (10). An advantage of the invention is that one size of the downhole tool may fit all sizes of a casing or tubing. The invention also relates to method of cleaning and honing casings or tubings in a well.