Multi-Stage Wellbore Packer Isolation for High Differential Pressure
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Solution Overview
Problem
Existing hydrocarbon well operations face challenges in maximizing the allowable differential pressure between an isolated well interval and surrounding well fluid, which limits the pressure that can be applied during operations like fluid extraction or microfracturing.
Innovation Solution
A multiple pressure stage well interval isolation device is employed, utilizing a plurality of expandable elements positioned on a tool string to create both a primary isolated well interval and guard intervals. This configuration allows for increased pressure differences by isolating the primary interval from the surrounding fluid through the guard intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a single packer device is used to isolate a well interval, then the isolation is achieved, but the maximum differential pressure is limited by the packer's structural strength
Solution Approach 1:
The single packer isolation system is divided into multiple independent packer stages (first packer stage with first and second packers, second packer stage with third and fourth packers). Each stage can independently withstand differential pressure up to its structural limit, allowing the total differential pressure across the isolated interval to be the sum of pressures across multiple stages, thereby exceeding the limit of any single packer.
2Stress or pressure
If multiple packer stages are used to increase differential pressure capacity, then the pressure handling capability is improved, but the device complexity increases
Solution Approach 1:
Each packer stage is designed with identical structural components and functional capabilities, serving as a universal module that can be replicated. The first packer stage and second packer stage use the same packer configuration, sealing mechanism, and pressure containment design, allowing the system to achieve higher differential pressure through standardized repetition rather than custom complex design.
Solution Approach 2:
The multiple packer stages are arranged in a nested configuration along the wellbore, with each stage containing its own internal components (packers, sealing elements, pressure containment structures) within the isolation device assembly. The stages are positioned sequentially to create nested isolation zones that collectively handle the total differential pressure load.
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 use of multiple pressure stages effectively doubles the maximum functional pressure difference that can be created between the primary isolated well interval and the surrounding well fluid, enabling safer and more effective well operations.
Implementation Method 1
a first, uphole expandable element, and a second, downhole expandable element spaced apart on a tool string and cooperating with a primary interval tool to form a primary interval isolating section
Data Source
AI summary
A well interval isolation device is disclosed. The wellbore isolation device may have a plurality of expandable elements that cooperate upon expansion downhole in a wellbore to create multiple isolated well intervals. At least two pairs of expandable elements that are spaced apart on a tool string are usable to create both a primary isolated well interval and at least one isolated guard interval on each of an uphole side and a downhole side of the primary isolated well interval. The isolated guard intervals function to further isolate the primary isolated well interval from surrounding well fluid, thereby allowing a difference between the pressure within the primary isolated well interval and the hydrostatic pressure of the well fluid (i.e., the differential pressure) to safely exceed the maximum differential pressure at which any of the individual expandable elements can operate while simultaneously maintaining isolation of the well intervals.