Ligninamide Oilfield Plugging Agent for Temperature-Resistant Gel Strength
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Solution Overview
Problem
Existing plugging agents face issues with high costs, poor temperature resistance, and insufficient strength due to the use of conventional petrochemical materials, which are not environmentally friendly and require high concentrations of cross-linking agents, limiting their effectiveness in oilfield applications.
Innovation Solution
A plugging agent comprising modified ligninamide, obtained through amination and acylation of lignin, is used to increase cross-linking sites and improve activity, allowing for gelling over a wide range of oil reservoir temperatures with improved temperature resistance and strength, reducing the need for petrochemical feedstocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional petrochemical-based plugging agents are used, then plugging function is achieved, but cost increases and environmental friendliness deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by replacing petrochemical-based polymers with lignin-based natural polymers. This substitution maintains the plugging function while improving environmental compatibility, as lignin is a renewable, biodegradable material derived from agricultural waste
Solution Approach 2:
The patent creates a composite plugging agent system combining lignin base polymer with modified starch and crosslinking agents. This composite structure integrates the advantages of natural polymers (environmental friendliness, cost-effectiveness) while maintaining sufficient plugging performance through synergistic material combinations
2Strength
If high concentration of cross-linking agents is used, then gel strength is improved, but cost increases and temperature resistance deteriorates
Solution Approach 1:
The patent optimizes the crosslinking agent concentration parameter to a low range (0.01-0.5 wt%) while improving the quality of crosslinking through modified starch intermediates. This approach achieves adequate gel strength without the need for high crosslinking agent concentrations, thereby preserving temperature resistance
Solution Approach 2:
The patent introduces modified starch as an intermediary substance between the lignin base polymer and crosslinking agents. This intermediary enhances the crosslinking efficiency and gel network structure, allowing for reduced crosslinking agent dosage while maintaining gel strength and improving temperature stability
3Ease of manufacture
If lignin is directly used as plugging agent, then cost is reduced, but cross-linking activity is insufficient and strength deteriorates
Solution Approach 1:
The patent performs preliminary modification of lignin through amination and acylation reactions before using it as a plugging agent. These pre-treatment steps introduce functional groups that enhance crosslinking activity and gel strength, allowing the use of cost-effective lignin while achieving required performance standards
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 ligninamide-based plugging agent provides high viscosity, controllable gelling time, and wide applicability, effectively reducing production costs and meeting environmental and on-site construction requirements while enhancing oil recovery efficiency.
Implementation Method 1
obtained through amination and acylation of lignin
Implementation Method 2
obtained through amination and acylation of lignin
Implementation Method 3
allowing for gelling over a wide range of oil reservoir temperatures with improved temperature resistance and strength
Implementation Method 4
improved temperature resistance
Data Source
AI summary
The present disclosure relates to the field of oilfield plugging agents, and in particular to a plugging agent for oil extraction in an oilfield and a preparation method therefor and an application thereof.