Ceramic-Coated Proppant Strength and Durability
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Solution Overview
Problem
Conventional proppants used in hydraulic fracturing face challenges such as inadequate strength and chemical resistance, leading to fracture closure and reduced hydrocarbon production due to crushing and fines generation, which are exacerbated by resin coatings that degrade over time and become brittle under heat.
Innovation Solution
Ceramic-coated proppants are developed by applying a ceramic matrix composite (CMC) coating to core proppants, using materials like calcined clay, bauxite, silica, or alumina, to enhance strength and chemical resistance, and incorporating reinforcing fibers to improve crack resistance and fracture toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If resin coatings are applied to proppants to improve strength, then proppant strength is improved, but the coating degrades over time and becomes brittle under heat
Solution Approach 1:
The patent changes the material parameter from organic resin to inorganic ceramic coating. The ceramic coating is applied and then sintered at high temperature (900-1500°C) to create a stable, heat-resistant layer that maintains its properties under downhole conditions, eliminating the degradation issues of resin coatings.
Solution Approach 2:
The patent uses ceramic matrix composite (CMC) materials consisting of ceramic particles embedded in a ceramic matrix. This composite structure provides both the strength enhancement needed and the thermal stability required for long-term reliability in high-temperature formation environments.
2Strength
If conventional proppants are used in high-stress formations, then fracture closure occurs, but proppant crush strength is insufficient
Solution Approach 1:
The patent applies a ceramic coating to conventional proppants (like sand) to create a composite structure. The ceramic outer layer provides high crush strength and fracture toughness, allowing the proppant to withstand high formation closure stresses without crushing, while the inner proppant core maintains the necessary permeability and fracture conductivity.
3Reliability
If proppants are coated with ceramic to improve strength and chemical resistance, then durability is improved, but manufacturing complexity increases
Solution Approach 1:
The ceramic coating process is designed to be self-adhering through a slurry application method. The coating slurry is applied to the proppant surface and then sintered, where the ceramic material fuses to the proppant core without requiring additional bonding agents or complex multi-step processes, simplifying manufacturing while achieving the desired chemical resistance.
Data Source
AI summary
A method of forming a ceramic-coated proppant, including receiving a proppant or particle and coating the proppant or particle with ceramic to give a ceramic coating on the proppant or particle. A method of hydraulic fracturing a geological formation with the ceramic-coated proppant.