Comb Polymer Filtration Control Agent for High-Temperature Drilling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current filtration control agents in drilling fluids have poor temperature resistance and salt resistance, leading to ineffectiveness under high-temperature and high-salinity conditions, causing significant water loss and instability in boreholes.
Innovation Solution
A comb polymer with a specific structural formula and salt thereof is developed, featuring high temperature and salt resistance, which is used as a filtration control agent in drilling fluids, synthesized through inverse emulsion polymerization with defined molecular structures and rigid chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filtration control agents are used in drilling fluids, then filtration-reducing function is provided, but temperature resistance and salt resistance deteriorate under high-temperature and high-salinity conditions
Solution Approach 1:
The patent changes the chemical parameters of the filtration control agent by introducing temperature-resistant functional groups (amides, sulfonic acids) and optimizing the molecular structure with specific molar ratios of constitutional units. This transforms the polymer's chemical stability parameters to withstand high temperatures and high salinity while maintaining filtration-reducing function.
Solution Approach 2:
The patent creates a composite polymer structure combining multiple functional units (amido groups, carboxylic acid groups, sulfonic acid groups, and comb-shaped side chains) into a single molecular architecture. This composite structure integrates temperature resistance, salt resistance, and filtration control capabilities into one material system.
2Reliability
If conventional filtration control agents are used in drilling fluids, then filtration-reducing function is provided, but chemical stability deteriorates under high-temperature conditions
Solution Approach 1:
The patent changes the chemical stability parameters by selecting functional groups with high thermal stability (amides, sulfonic acids) and optimizing the molecular weight and molar ratios. These parameter changes prevent hydrolysis and degradation under high-temperature drilling conditions while maintaining the polymer's filtration control effectiveness.
3Reliability
If comb polymer with complex structure is synthesized, then temperature and salt resistance are improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the complex polymer structure into distinct constitutional units with specific functions (backbone units, amido groups, carboxylic acid groups, sulfonic acid groups, and comb-shaped side chains). Each segment serves a specific purpose: backbone provides structural integrity, amido groups provide temperature resistance, and comb-shaped sides provide salt resistance. This segmentation makes the complex structure manageable and synthesizable.
Solution Approach 2:
The patent applies local quality by placing specific functional groups at specific positions within the polymer chain. The comb-shaped side chains are distributed along the backbone at controlled intervals, and different functional groups (amido, carboxylic, sulfonic) are positioned to optimize their respective contributions to temperature resistance, salt resistance, and filtration control.
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 comb polymer effectively reduces filter loss in drilling fluids, maintaining performance at high temperatures and in high-salinity conditions, offering excellent temperature and salt resistance, and chemical stability, thus enhancing drilling fluid stability and efficiency.
Implementation Method 1
Molecules of the filtration control agent can be absorbed on one side of clay crystal particles to form a bridging therebetween
Implementation Method 2
comprehensively block capillary channels in a mud cake that is formed by the drilling fluid and the soil
Implementation Method 3
increase negative charge density on the mud cake to form a strong polarization water layer
Implementation Method 4
synthesized through inverse emulsion polymerization with defined molecular structures and rigid chains
Data Source
AI summary
The present disclosure discloses a comb polymer or a salt thereof, wherein the structural formula of the comb polymer containing the following constitutional units.When the comb polymer provided in the present disclosure is used in a water-based drilling fluid as a filtration control agent, it can eliminate the defects of conventional filtration control agents which would be subject to ineffectiveness under high temperature and high salinity conditions. The comb polymer has high temperature and salt resistance, and can be produced through simple processes at comparatively low costs. When the comb polymer provided by the present disclosure is used as a filtration control agent, even being added into the drilling fluid at a comparatively low amount, it can still present rather good effects in lowering the amount of filter loss.