Phase-Change Microcapsules for Drilling Fluid Thermal Regulation
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Solution Overview
Problem
Existing drilling fluids face challenges in high-temperature environments, leading to degradation, changes in rheological and fluid loss performance, and reduced equipment lifespan, which complicates deep oil and gas drilling and geothermal resource exploration.
Innovation Solution
A phase-change heat storage microcapsule material is developed, comprising a phase-change core material (erythritol) and a high molecular wall material (polyethersulfone) modified with nano-graphite, which is microencapsulated to provide effective cooling to drilling fluids during high-temperature operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ground cooling method is used to reduce drilling fluid temperature, then cooling effect is achieved, but equipment investment is large and cooling efficiency is low
Solution Approach 1:
The drilling fluid contains phase-change heat storage microcapsule materials that automatically absorb excess heat through phase change when temperature rises, and release heat when temperature drops, enabling the drilling fluid to self-regulate its temperature without external cooling equipment
Solution Approach 2:
The microcapsule materials utilize phase change (solid-liquid transition) to absorb and release large amounts of latent heat, providing efficient thermal regulation for drilling fluid in high-temperature environments
2Temperature
If phase-change material is added to drilling fluid, then cooling effect is improved, but material leakage occurs
Solution Approach 1:
The phase-change material is encapsulated in a microcapsule shell structure that protects the internal phase-change material from leakage while allowing heat transfer through the shell wall, maintaining both cooling effectiveness and material stability
Solution Approach 2:
The microcapsule structure combines the phase-change material with an encapsulating shell material, creating a composite system that leverages the thermal properties of the phase-change material while the shell provides structural integrity and prevents leakage
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 phase-change heat storage microcapsule material effectively stabilizes the performance of drilling fluids in high-temperature environments by providing endothermic cooling, reducing drilling costs, and extending equipment lifespan.
Implementation Method 1
A phase-change heat storage microcapsule material suitable for cooling a drilling fluid... uses the heat storage properties of a phase-change material for cooling drilling fluids
Implementation Method 2
providing endothermic cooling to drilling fluids
Implementation Method 3
a high molecular wall material (polyethersulfone) modified with nano-graphite
Data Source
AI summary
The present disclosure belongs to the field of drilling fluid additives, and particularly relates to a phase-change heat storage microcapsule material suitable for cooling a drilling fluid and a preparation method therefor. The phase-change heat storage microcapsule material of the present disclosure consists of a high molecular wall material wrapped outside, a phase-change heat storage material as a core material and nano-graphite doped therein, and the microcapsules have an overall size within the range from 20 μm to 80 μm.