Metal Matrix Composite Ball Sealer for High-Pressure Wellbore Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current ball sealers face challenges in being both light and strong enough to withstand high pressures and temperatures in wellbore operations without distorting or shattering, while also being buoyant in working fluids, due to limitations in materials and constructions.
Innovation Solution
A ball sealer construction featuring a lightweight, spherical core (solid or hollow) with a metal matrix composite (MMC) layer formed by winding continuous high-strength fibers and infiltrating them with molten metal, providing exceptional strength and stiffness with a low specific gravity, and optionally coated for chemical and mechanical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ball sealers are constructed from high strength materials such as resin-infused syntactic foam core covered with elastomeric or plastic material, then strength is improved, but density increases and buoyancy is reduced
Solution Approach 1:
The ball sealer uses a composite structure combining a light-weight core (syntactic foam or hollow sphere) with a metal matrix composite coating layer. The metal matrix composite consists of continuous high-strength fibers (such as carbon, alumina, or boron fibers) embedded in a metal matrix (aluminum, bronze, beryllium, cobalt, copper, gold, iron, nickel, or zinc). This composite structure provides high strength while maintaining low density and buoyancy in the working fluid.
2Stress or pressure
If ball sealers are constructed with higher strength materials to withstand increased working pressures, then pressure resistance is improved, but weight increases and buoyancy is reduced
Solution Approach 1:
The metal matrix composite coating provides exceptional strength and stiffness to withstand high wellbore pressures while the light-weight core maintains low overall density. The continuous high-strength fibers in the metal matrix provide superior pressure resistance compared to traditional elastomeric or plastic coatings, while the metallic matrix keeps the overall weight lower than solid high-strength materials.
3Quantity of substance
If ball sealers use traditional materials to maintain buoyancy in working fluid, then buoyancy is maintained, but strength and stiffness are insufficient for high pressure applications
Solution Approach 1:
The combination of light-weight core material (syntactic foam or hollow sphere) maintains buoyancy in the working fluid, while the metal matrix composite coating layer provides the necessary strength and stiffness. The continuous high-strength fibers embedded in the metal matrix create a structure that is both buoyant and capable of withstanding high wellbore pressures and temperatures.
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 results in a ball sealer with a high-temperature, high-pressure capability and an exceptional strength-to-weight ratio, ensuring effective sealing and durability in harsh wellbore environments.
Implementation Method 1
the fiber layer is infiltrated with molten metal at high temperature and pressure such that the metal impregnates the fiber layer to form a metal matrix composite (MMC) layer
Implementation Method 2
Ball sealers also need to be buoyant within the working fluid, and therefore are required to be of a density which is within a specific range
Data Source
AI summary
High strength, low density ball sealer for sealing openings in oil or gas wells, such as perforations formed through the well casing or openings formed through slidable packers or sleeves received within a tubing string in the well, from the flow of a fluid injected into the well. The ball sealer is formed as having an inner core, and a metal matrix composite layer surrounding the core.