Expandable Metal Packer with Differential Pressure Valve
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Solution Overview
Problem
Expandable metal packers in wellbore applications face challenges with pressure differentials and thermal sensitivity, affecting their sealing efficacy and durability.
Innovation Solution
A differential pressure valve system is integrated into the packer, comprising a plurality of valves that automatically adjust to compensate for pressure differentials and maintain sealing engagement, while being constructed to minimize sensitivity to thermal variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a deformable metal membrane is used for sealing in an expandable metal packer, then the packer can be expanded under fluid pressure to provide annular barriers, but the seal becomes susceptible to pressure differentials between uphole and downhole sections of the annulus
Solution Approach 1:
The packer system is segmented into multiple functional components: the metal sealing element, the elastomeric sealing element, and the differential pressure valve system. This segmentation allows each component to address specific aspects of the sealing problem, with the valve system specifically designed to counteract pressure differential effects on the metal membrane seal
Solution Approach 2:
The differential pressure valve system acts as an intermediary mechanism between the annulus pressure differential and the metal sealing element. The valve system compensates for pressure differentials by allowing controlled fluid communication, thereby protecting the metal membrane seal from excessive differential pressures that would compromise its sealing reliability
2Reliability
If the packer is designed to hold against high differential pressures, then sealing efficacy is improved, but the packer becomes more sensitive to thermal variations
Solution Approach 1:
The packer employs a composite sealing system combining metal and elastomeric materials, each with different thermal and pressure response characteristics. The metal membrane provides pressure resistance while the elastomeric element compensates for thermal expansion and contraction, reducing overall thermal sensitivity while maintaining high differential pressure holding capability
Solution Approach 2:
The differential pressure valve system dynamically adjusts internal pressure parameters in response to external conditions. By changing the pressure state within the metal sealing element based on differential pressure conditions, the system maintains sealing efficacy while the elastomeric component's viscoelastic properties help dampen thermal sensitivity
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 system effectively holds against higher differential pressures and reduces thermal sensitivity, ensuring a secure seal with the surrounding wall surface in varying conditions.
Implementation Method 1
The metal sealing element may be expanded under fluid pressure for sealing engagement with a surrounding wall surface
Implementation Method 2
the differential pressure valve system is placed in fluid communication with the interior of the metal sealing element and comprises a plurality of valves which operate automatically to increase pressure within the metal sealing element when certain pressure differentials occur
Data Source
AI summary
A technique facilitates use of a packer in a borehole or within other tubular structures. The packer may be constructed with a tubing, a metal sealing element mounted around the tubing, and a differential pressure valve system. The metal sealing element may be expanded under fluid pressure for sealing engagement with a surrounding wall surface. Additionally, the differential pressure valve system is placed in fluid communication with the interior of the metal sealing element and comprises a plurality of valves which operate automatically to increase pressure within the metal sealing element when certain pressure differentials occur. The differential pressure valve system enables the packer to hold against higher differential pressures and also may be constructed so the packer is less sensitive to thermal variations.