Pressure Compensation Module for Coring Tools
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Solution Overview
Problem
Coring tools face challenges in maintaining pressure equilibrium between presaturation fluid within the receptacle and drilling fluid outside, leading to potential contamination of core samples due to premature activation of the activation module caused by pressure differentials.
Innovation Solution
A pressure compensation module is introduced, featuring a movable fluid boundary, such as a compensating piston or flexible member, to equalize pressure differences between the presaturation fluid and drilling fluid, and a one-way pressure relief valve to prevent contamination by ensuring the presaturation fluid does not mix with drilling fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receptacle is sealed and filled with presaturation fluid to prevent contamination, then core sample purity is improved, but pressure differentials cause premature activation of the activation module
Solution Approach 1:
A compensating piston is introduced as an intermediary element between the presaturation fluid and drilling fluid. The piston moves in response to pressure differentials, expanding or compressing the presaturation fluid volume to equalize pressures on both sides of the sealed receptacle, thereby preventing premature activation while maintaining the seal integrity
Solution Approach 2:
The system changes the volume parameter of the presaturation fluid dynamically through the movement of the compensating piston. By adjusting the fluid volume in response to pressure differentials, the system maintains pressure equilibrium between the sealed receptacle interior and exterior, preventing harmful premature activation
2Reliability
If the activation module is used to seal the receptacle entrance, then contamination is prevented, but pressure differentials may cause premature activation
Solution Approach 1:
The compensating piston acts as a mediator that responds to pressure differentials before they can trigger premature activation. By equalizing pressures through piston movement and presaturation fluid compression/expansion, the system protects the activation module from premature triggering while maintaining seal integrity
3Reliability
If presaturation fluid is used to presaturate the receptacle, then core sample contamination is reduced, but pressure differentials may cause fluid mixing and contamination
Solution Approach 1:
The compensating piston serves as a physical barrier and pressure equalization mechanism that prevents direct contact and mixing between presaturation fluid and drilling fluid. By responding to pressure differentials through piston movement, the system maintains pressure equilibrium while preventing harmful fluid mixing
Solution Approach 2:
The compensating piston functions as a flexible barrier that can deform and move in response to pressure differentials. This flexible element maintains separation between the two fluid systems while accommodating pressure changes, preventing mixing and contamination
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
This solution effectively reduces the likelihood of contamination by maintaining pressure equilibrium, preventing premature activation of the activation module and ensuring accurate representation of earth formation characteristics in core samples.
Implementation Method 1
The compensation module is configured to reduce pressure differences between the first fluid and the second fluid over a range of pressure differences
Implementation Method 2
The fluid boundary is movable to enable expansion or compression of the first fluid in response to pressure differences across the fluid boundary
Implementation Method 3
a one-way pressure relief valve to prevent contamination by ensuring the presaturation fluid does not mix with drilling fluid
Data Source
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AI summary
Methods of compensating pressure differences between interiors and exteriors of inner barrels of coring tools may involve advancing a coring tool into a wellbore, the coring tool comprising an inner barrel for receiving a core sample cut by the coring tool, a first fluid being sealed within the inner barrel. A second fluid may flow along an exterior of the inner barrel. A pressure difference between the first fluid and the second fluid may be reduced. A volume occupied by the first fluid may be compressed by moving a compensating member. The volume occupied by the first fluid may be expanded by moving the compensating member.