Resin Slurry Plugging System for Fractured-Vuggy Formations
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Solution Overview
Problem
Existing plugging materials for ultra-high temperature fractured-vuggy reservoirs lack sufficient high-temperature resistance, pressure-bearing capacity, and controllable consolidating time, making them inadequate for effective lost circulation control.
Innovation Solution
A resin slurry plugging system composed of a composite resin plugging agent, consolidating agents, flow pattern regulators, cross-linking agents, retarders, and filling agents, which forms a three-dimensional cross-linked network structure under high-temperature conditions, providing strong retention and pressure-bearing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single consolidated resin such as epoxy resin is used, then high strength is achieved, but ultra-high temperature resistance is insufficient
Solution Approach 1:
The patent employs composite resin materials consisting of multiple resin components (e.g., phenolic resin, epoxy resin, unsaturated polyester resin) combined in specific ratios. This composite approach allows the plugging agent to simultaneously achieve high strength from epoxy resin and ultra-high temperature resistance from phenolic resin, resolving the contradiction between strength and temperature resistance that cannot be satisfied by a single resin type.
2Reliability
If thermosetting resin materials are used for plugging, then pressure resistance and heat resistance are improved, but consolidating time becomes too short under high temperature conditions
Solution Approach 1:
The patent introduces retarders (such as sodium lignosulfonate, calcium saccharate, or sugar calcium) that modify the chemical reaction parameters of the thermosetting resin. These retarders slow down the cross-linking reaction rate, extending the consolidating time from minutes to hours while maintaining the final pressure resistance and heat resistance properties of the thermosetting resin structure.
Solution Approach 2:
The patent uses consolidating agents (such as imidazole-oxazine consolidating agent, hexamethylene tetramine, or methyl tetrahydrophthalic anhydride) as intermediary substances that facilitate controlled cross-linking. These consolidating agents mediate the reaction between resin components, enabling gradual network formation that extends working time while ensuring complete consolidation and final performance.
3Reliability
If existing plugging materials are used in fractured-vuggy reservoirs, then some lost circulation control is achieved, but sufficient pressure-bearing capacity and temperature resistance are not achieved
Solution Approach 1:
The patent combines multiple resin types (phenolic resin for temperature resistance, epoxy resin for strength, unsaturated polyester resin for flexibility) in a composite formulation. This composite material approach ensures that the plugging agent can simultaneously provide lost circulation control, ultra-high temperature resistance (maintaining properties at 200-300°C), and high pressure-bearing capacity (withstanding pressures up to 100 MPa), which cannot be achieved by existing single-material plugging agents.
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 system achieves effective plugging of lose channels in fractured-vuggy reservoirs by maintaining strong temperature resistance and pressure-bearing capacity, ensuring safe construction conditions and efficient lost circulation control.
Implementation Method 1
cross-linking and consolidating under high-temperature conditions of the formation, has a strong retention capacity
Implementation Method 2
The resin slurry plugging system has a certain fluidity under low-temperature conditions... and can fill a lose channel of a fractured-vuggy reservoir. The consolidating time of the plugging system is controllable, and the construction conditions are safe. The plugging system forms a three-dimensional cross-linked network structure consolidation after cross-linking and consolidating under high-temperature conditions
Data Source
AI summary
A resin slurry for a fractured-vuggy formation and the preparation and use thereof, which belong to the field of drilling fluid lost circulation control. The resin slurry plugging system is composed of the following raw materials in mass percentage: 20%-40% of composite resin plugging agent, 0.5%-5.0% of consolidating agent, 0.5%-5.0% of flow pattern regulator, 0.3%-1.2% of cross-linking agent, 0.3%-1.2% of retarder, 3%-12% of filling agent, and the balance of water. The plugging system has a certain fluidity under low-temperature conditions, is easy to be injected into the formation, and can fill a lose channel of a fractured-vuggy reservoir. The consolidating time of the plugging system is controllable, and the construction conditions are safe. The plugging system forms a three-dimensional cross-linked network structure consolidation after cross-linking and consolidating under high-temperature conditions of the formation.