Oil-Soluble Thermosensitive Resin Lost Circulation Material
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Solution Overview
Problem
Conventional lost circulation materials exhibit weak performance in plugging large fractures and caves due to insufficient temperature resistance and pressure bearing, leading to secondary leakage and reduced oil and gas recovery efficiency.
Innovation Solution
An oil-soluble thermosensitive resin lost circulation material composed of 40-60 parts resin matrix, 15-40 parts modified asphalt, 5-12 parts viscosity modifier, 2-5 parts cross-linking agent, and 1-3 parts dispersant, which can melt and adhere at various temperatures, forming a plugging layer with high adhesion and elasticity, and is fully dissolved in crude oil for reservoir protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional plugging materials (walnut shell, mica) are used, then the material can be easily obtained and applied, but the temperature resistance and pressure bearing are insufficient, leading to poor plugging performance in large fractures
Solution Approach 1:
The patent uses a composite material system comprising thermosensitive resin, asphalt, coupling agent, and filler. This composite structure combines the high-temperature resistance of thermosensitive resin, the adhesion and flexibility of asphalt, and the bulk properties of filler, achieving superior plugging strength in large fractures while maintaining ease of application.
Solution Approach 2:
The patent employs thermosensitive resin that undergoes parameter changes (phase transition from solid to liquid) in response to temperature variations. This allows the material to adapt its properties to match formation conditions, providing effective plugging under high temperature and pressure while maintaining ease of injection during drilling operations.
2Adaptability or versatility
If gel lost circulation materials are used, then the material can adapt to pore size, but the temperature and salt resistance are poor and mechanical strength is low
Solution Approach 1:
The patent creates a composite system where thermosensitive resin provides temperature resistance, asphalt contributes to salt resistance and flexibility, and the combination maintains adaptability to pore sizes. This composite approach solves the reliability issues of gel materials while preserving their adaptability advantage.
Solution Approach 2:
The patent uses coupling agents to provide local quality enhancement at the interface between the plugging material and formation. This improves adhesion and reliability in specific critical zones while maintaining overall material adaptability to different pore structures.
3Duration of action of moving object
If oil-soluble thermosensitive resin lost circulation material is used, then rapid fracture plugging with long plugging time is achieved, but the oil soluble rate is low and oil solubility at high temperature is poor
Solution Approach 1:
The patent combines thermosensitive resin with asphalt and coupling agents to create a composite material that maintains excellent oil solubility and high-temperature solubility. The asphalt component specifically enhances oil compatibility, ensuring rapid dissolution and reservoir protection while the thermosensitive resin provides long plugging duration.
Solution Approach 2:
The coupling agent acts as an intermediary that improves the interaction between the resin matrix and oil, enhancing oil solubility and dissolution rate. This mediator allows the material to achieve both long plugging time and excellent oil compatibility without compromising either property.
4Strength
If existing oil-soluble lost circulation materials are used, then some plugging function is achieved, but the plugging strength is low and adaptive temperature range is narrow
Solution Approach 1:
The patent utilizes thermosensitive resin that undergoes parameter changes (melting point transition) in response to temperature variations. This allows the material to adapt to a wide temperature range, providing effective plugging from moderate to high temperature formations while maintaining high plugging strength through controlled phase transitions.
Solution Approach 2:
The composite formulation combines thermosensitive resin with asphalt and fillers in specific ratios to achieve both high plugging strength and broad temperature adaptability. The synergistic interaction of components expands the usable temperature range while enhancing overall plugging performance.
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 material achieves effective plugging of fractures with high pressure bearing capacity, long plugging time, and excellent oil solubility, recovering reservoir permeability and preventing repeated leakage, while being simple to produce and integrate into drilling operations.
Implementation Method 1
the oil-soluble thermosensitive resin lost circulation material can melt and adhere at various temperature ranges
Implementation Method 2
forming a plugging layer with high adhesion and elasticity
Implementation Method 3
the oil-soluble resin lost circulation material can be dissolved by oil flow during oil well production because of the characteristic that the oil-soluble resin is oil-soluble
Data Source
AI summary
An oil-soluble thermosensitive resin lost circulation material for protecting a reservoir includes the following raw materials in parts by weight: 40-60 parts of resin matrix, 15-40 parts of modified asphalt, 5-12 parts of viscosity modifier, 2-5 parts of cross-linking agent, 6-15 parts of softening point modifier, and 1-3 parts of dispersant; it further provides a method for preparing the resin lost circulation material; the resin lost circulation material can melt and adhere in different temperature ranges, rapid plugging is realized, and the plugging time is long; the oil-soluble thermosensitive resin lost circulation material can be dissolved by oil flow during oil well production, so that the reservoir permeability is recovered, so as to achieve the purpose of protecting the hydrocarbon reservoir.