Annular Rubber Probe Sidewall Contact Device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sidewall contact devices for stratum sampling in oil exploration suffer from insufficient friction force and unstable support due to their parallel structure, leading to sliding issues and reduced thrust transmission, which affects measurement accuracy and stability.
Innovation Solution
An annular detachable rubber probe sidewall contact device utilizing a piston rod structure driven by high-pressure hydraulic oil, where multiple polar plates are symmetrically distributed and perpendicularly contacted with the well wall, ensuring uniform pressure application and stable support through telescopic actions controlled by high-pressure oil paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a parallel structure consisting of main arm, polar plate and auxiliary arm is adopted, then the device can be unfolded to contact the well wall, but the friction force between the structure and well wall is insufficient, leading to unstable support
Solution Approach 1:
The patent inverts the conventional parallel structure by using a radial arrangement where the polar plate is perpendicular to the main arm instead of parallel. This inversion changes the force transmission direction from horizontal component to vertical component, maximizing friction force and support stability.
Solution Approach 2:
The patent changes the geometric parameters of the structure, specifically setting the opening angle of the main arm to 90 degrees and arranging the polar plate perpendicular to the main arm. This parameter change transforms the force transmission efficiency and maximizes the friction force between the contact structure and well wall.
2Adaptability or versatility
If the main arm opening angle is limited to less than 90 degrees to adapt to different well diameters, then the device has good adaptability, but the thrust applied to the polar plate is reduced due to horizontal component force division
Solution Approach 1:
The patent inverts the force transmission direction by making the polar plate perpendicular to the main arm, so that the thrust is transmitted vertically to the well wall without being divided into horizontal components. This inversion resolves the contradiction by maintaining full thrust efficiency while preserving adaptability through the adjustable radial structure.
Solution Approach 2:
The patent introduces asymmetric structural arrangement where the polar plate is positioned perpendicular to the main arm rather than in a symmetric parallel configuration. This asymmetry optimizes force transmission while the overall radial symmetry of multiple arms maintains adaptability to different well diameters.
3Ease of operation
If multiple connecting rod structures are used to form the sidewall contact arm, then the device can be unfolded for contact, but the connecting structure becomes complex, making maintenance and control difficult
Solution Approach 1:
The patent extracts and eliminates the complex auxiliary arm and polar plate connecting rod structures from the conventional design. By directly connecting the main arm to the well wall through a simplified radial structure, the device achieves easier control and maintenance while maintaining the essential function of sidewall contact.
Solution Approach 2:
The patent segments the device into independent radial arms that can be controlled separately, simplifying the overall connecting structure. Each arm operates independently with its own actuator, making the system easier to control and maintain compared to the interconnected parallel structure.
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 solution enhances the supporting force and stability of the sidewall contact device, improves measurement accuracy, and simplifies control and maintenance processes while reducing failure rates and manufacturing costs by applying uniform pressure perpendicular to the well wall.
Implementation Method 1
The piston rod is directly pushed by high-pressure hydraulic oil, and perpendicularly contacts with the well wall
Data Source
AI summary
An annular detachable rubber probe sidewall contact device includes: a body which is columnar, wherein a high-pressure output oil path and a high-pressure retracting oil path are arranged in the body; a sidewall contact arm comprising multiple polar plates which are symmetrically distributed on an external circumference of the body, wherein each of the polar plates is movably installed on the body through a piston rod, and the piston rod is perpendicular to the body; the body has a piston cavity for accommodating the piston rod, and the piston cavity communicates with both the high-pressure output oil path and the high-pressure retracting oil path; and a sampling pipe, wherein one end of the sampling pipe is connected to the polar plates, and the other end of the sampling pipe communicates with a sampling channel in the body through a sampling cavity in the body.