Coated Rubber Particle Plugging Material for Oil-Based Drilling Fluids
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current plugging materials for oil-based drilling fluids lack specialized components that provide high strength, oil resistance, and elastoplasticity, leading to ineffective plugging and potential re-leakage during deep well drilling.
Innovation Solution
Development of a coated rubber particle with a fluorine-containing coating layer and an inorganic particle component, which has a low 24-hour oil absorption rate and enhanced high-valence metal content, improving its oil resistance and pressure-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional water-based drilling fluid plugging materials are used in oil-based drilling fluid, then plugging operation can be performed, but the materials have oil solubility and poor compatibility, leading to reduced plugging effect and potential reverse impact on drilling fluid performance
Solution Approach 1:
The patent applies local quality by creating a coated rubber particle with distinct core and coating regions having different properties. The rubber core provides elasticity and deformation capability, while the fluorine-containing coating layer provides oil resistance and chemical stability. This local differentiation allows the material to simultaneously achieve compatibility with oil-based drilling fluid and reliable plugging effect, resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The patent employs composite materials by combining rubber particles with fluorine-containing inorganic coating materials to create a coated rubber particle composite. This composite structure integrates the elastoplastic properties of rubber with the oil resistance and high-valence metal content of fluorine-containing inorganic materials, enabling the plugging material to function effectively in oil-based drilling fluid while maintaining both adaptability and plugging reliability.
2Duration of action of moving object
If elastoplastic plugging particles are used to achieve deformation capability, then plugging can be formed, but the particles have oil solubility and reduced strength after prolonged exposure to oil-based drilling fluid
Solution Approach 1:
The coated structure creates local quality differentiation where the fluorine-containing coating layer protects the rubber core from oil penetration. This protective barrier maintains the strength and elasticity of the rubber core over extended periods in oil-based drilling fluid, resolving the contradiction between duration of action and strength retention.
Solution Approach 2:
The patent effectively creates a long-lasting plugging material by preventing the rubber core from degrading. The fluorine-containing coating acts as a protective barrier that prevents oil from penetrating and dissolving the rubber, thereby extending the service life and maintaining the strength and elasticity of the plugging particles throughout the drilling operation.
3Object-affected harmful factors
If rubber particles are used as plugging material, then elastoplasticity is achieved, but oil resistance is poor and dissolution occurs in oil-based drilling fluid
Solution Approach 1:
The fluorine-containing coating layer serves as an intermediary barrier between the rubber core and the oil-based drilling fluid. This intermediate layer prevents direct contact and chemical interaction between the rubber and oil, providing oil resistance and maintaining the chemical stability of the rubber core, thereby resolving the contradiction between oil resistance and compositional stability.
Solution Approach 2:
The coated rubber particle composite combines the elastoplastic properties of rubber with the oil resistance and chemical stability of fluorine-containing inorganic coating materials. This composite structure allows the material to withstand prolonged exposure to oil-based drilling fluid without dissolution, achieving both oil resistance and compositional stability simultaneously.
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 coated rubber particle demonstrates improved oil resistance and strength, maintaining effective plugging performance even after prolonged exposure to oil-based drilling fluids under high-temperature and high-pressure conditions.
Implementation Method 1
the coating layer has a fluorine content (at %) of 30-80% and the coated rubber particle has a 24-hour oil absorption rate of 4% or less
Implementation Method 2
a coated rubber particle, comprising a rubber core and a coating layer
Data Source
AI summary
Disclosed is a coated rubber particle, preparation thereof and its application as a plugging material in drilling fluids. The coated rubber particle comprises a rubber core and a coating layer, wherein the core has a fluorine content (at %) of 0-15%, the coating layer has a fluorine content (at %) of 30-80%, and the coated rubber particle has a 24-hour oil absorption rate of 4% or less. The coated rubber particle has good oil resistance, and is particularly suitable for use as a plugging material in drilling fluids, particularly oil-based drilling fluids.