Dendritic Polymer Drilling Fluid Additive
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Solution Overview
Problem
In the emulsion polymerization field, residual surfactants after polymerization reactions pose quality issues, and in petroleum drilling, linear polymers fail to meet the requirements for well drilling due to degraded tackifying ability under high-salinity conditions, necessitating a polymer treating agent with improved heat resistance, salinity resistance, and inhibiting properties for water-based CaCl2/polymer drilling fluids.
Innovation Solution
Development of a dendritic polymer and hyperbranched copolymer with specific structural units and ratios, which can be used to create a polymer treating agent that enhances the heat resistance, salinity resistance, and inhibiting properties of drilling fluids, including a method for their preparation involving condensation reactions and nucleophilic addition processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If linear polymers are used in water-based CaCl2 drilling fluids, then the drilling fluid can be environmentally friendly and cost-effective, but the tackifying ability is degraded under high-salinity conditions
Solution Approach 1:
The patent changes the molecular structure parameter from linear to dendritic/hyperbranched architecture, which fundamentally alters the polymer's interaction with high-salinity environments. The dendritic structure with multiple terminal groups maintains tackifying ability in CaCl2 solutions where linear polymers fail, resolving the contradiction between environmental benefits and performance under high-salinity conditions
Solution Approach 2:
The invention creates a composite polymer system combining dendritic structural units with specific functional groups (carboxyl, hydroxyl, amino) to achieve both environmental compatibility and high-salinity resistance. The multi-functional composite structure allows the polymer to maintain effectiveness in water-based CaCl2 drilling fluids while preserving tackifying properties
2Reliability
If conventional polymer treating agents are used, then the drilling process can proceed with standard materials, but heat resistance and salinity resistance are insufficient under extreme well conditions
Solution Approach 1:
The patent modifies the polymer's thermal and salinity resistance parameters through dendritic structural design with controlled generation numbers (n=2-6) and specific functional group ratios. This structural parameter change enables the polymer to withstand extreme well conditions (high temperature and high salinity) that conventional polymers cannot endure, while maintaining adaptability to various drilling fluid formulations
3Reliability
If dendritic polymer with complex structure is synthesized, then heat resistance and salinity resistance are improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the dendritic polymer synthesis into modular stages: first forming the dendritic core structure with repeating units, then adding functional groups (carboxyl, hydroxyl, amino) in controlled ratios. This segmentation of the synthesis process makes the complex dendritic structure manufacturable by breaking down the multi-step synthesis into manageable, standardized operations with controllable parameters
Solution Approach 2:
The invention controls manufacturing complexity by establishing specific parameter ranges: generation number n=2-6, and functional group ratios (carboxyl:hydroxyl:amino within defined proportions). These parameter specifications transform the complex dendritic synthesis into a controlled process with measurable quality standards, balancing improved reliability with ease of manufacture
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 dendritic polymer and hyperbranched copolymer significantly reduce filtrate loss, improve inhibiting ability, and maintain viscosity under high-temperature and high-salinity conditions, making them suitable for safe well drilling operations with improved water-solubility and environmental benefits.
Implementation Method 1
The dendritic polymer and hyperbranched copolymer significantly reduce filtrate loss, improve inhibiting ability, and maintain viscosity under high-temperature and high-salinity conditions
Implementation Method 2
a dendritic polymer, having a structure denoted by Z-(Q)n-Y, wherein Z represents a group that can have condensation reaction with acyl halides; Q represents a dendritic constitutional repeating unit of the dendritic polymer; n represents the generation number of the dendritic polymer
Data Source
AI summary
A dendritic polymer, a dendritic polymer monomer, and a hyperbranched copolymer are described. The dendritic polymer monomer has a structure denoted by Z′-(Q)n-Y, wherein Z′ represents a structure denoted by the following formula (a) and/or formula (b), Q represents a dendritic constitutional repeating unit of the dendritic polymer monomer, n represents the generation number of the dendritic polymer monomer, and is an integer within a range of 2-6, Y represents a group that contains SO3− and COO−, R14-R16 can be identical to or different from each other, and are H or C1-C5 alkyl respectively. The monomer can be used as a copolymerizable monomer for preparing a hyperbranched polymer applicable to oil fields, the obtained hyperbranched polymer can be used as an inhibiting filtrate reducer for drilling fluid, flocculating agent, encapsulating agent, heat-resistant and salinity-resistant polymer flooding agent, and thickening agent for fracturing liquid, etc.