Compressible Graphite Beads for Trapped Annulus Pressure Management
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Solution Overview
Problem
In hydrocarbon recovery operations, trapped annuli in wellbores experience pressure increases due to production fluids, which can exceed the pressure ratings of inner casing strings, leading to potential pipe collapse or well failure, necessitating a solution to absorb burst pressure and maintain well integrity.
Innovation Solution
Designing compressible particles with buoyancy in aqueous carrier fluids, specifically porous graphite or graphene beads, to be placed in trapped annuli, which collapse under increased pressure, absorbing pressure and reducing the risk of pipe failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compressible particles are placed in trapped annuli, then pressure absorption capability is improved, but particle settlement occurs due to gravity
Solution Approach 1:
The patent applies buoyancy as a counterweight force to gravity by selecting compressible particles with density lower than the carrier fluid. This enables the particles to remain suspended in the trapped annuli rather than settling, ensuring uniform distribution and consistent pressure absorption capability throughout the annular space.
Solution Approach 2:
The patent changes the density parameter of the compressible particles by selecting materials and designing particle structures with specific density characteristics. By controlling particle density to be less than the carrier fluid density, the system achieves both suspension stability and effective pressure absorption through buoyancy-driven uniform distribution.
2Reliability
If compressible particles are used to absorb pressure, then wellbore stability is improved, but particle density must be precisely controlled to prevent settlement
Solution Approach 1:
The patent employs parameter changes by precisely controlling the density of compressible particles within a specific range (0.8-1.2 g/cm³). This density control enables the particles to remain suspended in the carrier fluid while maintaining effective compressibility for pressure absorption, thereby achieving wellbore stability without particle settlement.
Solution Approach 2:
The patent applies local quality by selecting specific density ranges for compressible particles based on the characteristics of the carrier fluid and trapped annuli. This localized optimization of particle density ensures that particles remain suspended in the specific operational environment while maintaining their pressure absorption function.
3Stability of the object's composition
If buoyant compressible particles are used, then particle suspension is improved, but particle selection and design complexity increases
Solution Approach 1:
The patent manages complexity by establishing a specific density parameter range (0.8-1.2 g/cm³) for compressible particles. This parameter specification simplifies the selection process by providing clear criteria, while still achieving the desired suspension stability through buoyancy control in the carrier fluid.
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 compressible particles effectively absorb pressure increases within trapped annuli, preventing pipe collapse and ensuring wellbore stability by providing additional volume for fluid expansion, thus protecting the wellbore tubulars from damage.
Implementation Method 1
The compressible particles are designed to volumetrically compress as pressure increases in a confined volume such as a trapped annulus
Implementation Method 2
Designing compressible particles with buoyancy in aqueous carrier fluids... selecting a density for the compressible particles that is less than the density of the carrier fluid to provide for buoyancy of the compressible particles in the carrier fluid
Data Source
AI summary
A method of designing compressible particles for a fluid mixture. The compressible particles are intended to be used for attenuating pressure within a confined volume such as a trapped annulus. Preferably, the compressible particles reside buoyantly within an aqueous fluid, forming a fluid mixture. Each of the compressible particles is fabricated to collapse in response to fluid pressure within the confined volume, and comprises carbon. The particles may each have a porosity of between 5% and 40%, and a compressibility of between 10% and 30%, at 10,000 psi. The particles are tuned to have a buoyancy that is lower than the carrier fluid while still having resiliency.