Polymer Thickening Agent for Fracturing Fluid Compatibility
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Solution Overview
Problem
Current fracturing fluid systems for ultra-deep oil and gas reservoirs face challenges such as high viscosity, large pumping frictional resistance, and poor compatibility between different fluids, which hinder efficient on-site operation and reservoir reformation.
Innovation Solution
A novel polymer-based thickening agent with acid and temperature resistance is developed, comprising specific structural units that enable integration with various fracturing fluids, reducing the number of required devices and simplifying on-site preparation, and is capable of forming crosslinked fracturing fluids and acids with improved temperature and shear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional fracturing fluid systems (bio-based, mixed, or synthetic polymer) are used for ultra-deep stratum reformation, then the fluids can withstand high temperature conditions, but the base fluid viscosity becomes excessively high and pumping frictional resistance increases severely
Solution Approach 1:
The patent modifies the molecular structure of the polymer by introducing specific structural units (formulae 1-4) with controlled molecular weight and composition ratios. This changes the physical parameters of the polymer to achieve optimal balance between temperature resistance and frictional resistance, allowing the thickening agent to function effectively at high temperatures while maintaining acceptable pumping characteristics
Solution Approach 2:
The patent creates a composite thickening agent system by combining multiple polymer structural units (formulae 1-4) with different functional characteristics. This composite approach allows the material to simultaneously exhibit high-temperature stability, appropriate viscosity, and reduced frictional resistance, resolving the contradiction between temperature resistance and pumping efficiency
2Adaptability or versatility
If multiple different thickening agents are used for different fracturing fluid types (slickwater, glue solution, gelled acid, cross-linking acid), then each fluid can be optimized for its specific function, but the device complexity increases and on-site preparation becomes cumbersome
Solution Approach 1:
The patent develops a universal thickening agent that can be integrated into multiple types of fracturing fluids (slickwater, glue solution, gelled acid, cross-linking acid) through its molecular structure designed to be compatible with various fluid systems. This single multi-functional thickening agent replaces the need for multiple specialized agents, simplifying on-site preparation while maintaining fluid optimization
Solution Approach 2:
The patent merges the functions of multiple separate thickening agents into a single integrated polymer system. By combining the thickening capabilities needed for different fluid types into one material with appropriate molecular structure (formulae 1-4), the patent reduces the number of separate substances needed on-site, thereby reducing device complexity and preparation effort
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 polymer-based thickening agent streamlines on-site fluid preparation, enhances compatibility between different fracturing fluids, and meets the demands of high-temperature reservoir fracturing, offering significant economic benefits and improved operational efficiency.
Implementation Method 1
The thickening agent comprising the polymer of the present disclosure has acid resistance and temperature resistance, enables the integration of the thickening agent during the full fracturing or acid fracturing process
Implementation Method 2
the thickening agent can be used for reformation and increasing production of the deep stratum and ultra-deep stratum oil and gas reservoirs
Data Source
AI summary
A polymer, a thickening agent, and a preparation method therefor are provided. The polymer contains structural units of formula (1), formula (2), of formula (3), and of formula (4). The thickening agent contains the polymer and has instant solubility. It can be used for thickening slickwater, a glue solution, a cross-linked fracturing fluid and an acid solution having different viscosities, which improves compatibility between different fracturing fluids. Various fracturing fluid systems prepared by using the thickening agent have good temperature resistance, shearing resistance, sand-carrying performance, and a slow speed.