Acrylamide Copolymer Deep Profile Control High Salinity
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Solution Overview
Problem
Current polymer flooding technologies, such as those using partially hydrolyzed polyacrylamide, face limitations in temperature resistance and salt tolerance, leading to reduced viscosity and ineffective deep profile control in oil reservoirs with high water content and complex oil-water relationships.
Innovation Solution
An acrylamide copolymer comprising specific structural units is developed, which exhibits higher viscosity and desirable emulsifying properties under high temperature and high mineralization conditions, enabling effective deep profile control through a preparation method involving solution polymerization and hydrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If partially hydrolyzed polyacrylamide is used for polymer flooding, then the basic oil displacement function is achieved, but the temperature resistance and salt tolerance are low causing viscosity reduction under high temperature and high salinity conditions
Solution Approach 1:
The patent uses composite materials by incorporating multiple functional monomers (acrylamide, acrylic acid, and hydrophobic associating monomers) to create a copolymer that combines temperature resistance, salt tolerance, and deep profile control capabilities in a single material system
Solution Approach 2:
The patent applies local quality by introducing hydrophobic associating monomer units at specific positions within the polymer chain (0.5-10 mol% of total monomers), creating localized hydrophobic segments that provide temperature and salt resistance without compromising the overall hydrophilic chain structure and viscosity
2Length of moving object
If conventional chemical agents (strong gel, weak gel, particle gel) are used for deep profile control, then water absorption profile adjustment is achieved, but the control effect is limited to near-distance zones with short implementation period
Solution Approach 1:
The patent applies dynamics by creating a polymer system that transitions from a purely hydrophilic state to a hydrophobic associating state in response to temperature and salinity changes, enabling the polymer to dynamically adjust its conformation and interaction with oil-water interfaces, thereby extending its effective control distance and duration
Solution Approach 2:
The patent uses parameter changes by designing the copolymer to undergo conformational transitions and hydrophobic association at specific temperature and salinity thresholds, allowing the polymer to change its physical state and control mechanism based on reservoir conditions, thereby achieving extended deep profile control
3Reliability
If hydrophobic associating monomers are introduced to improve temperature and salt resistance, then viscosity stability is improved, but the complexity of polymerization process and monomer selection increases
Solution Approach 1:
The patent applies partial action by incorporating only a small but sufficient amount of hydrophobic associating monomers (0.5-10 mol% of total monomers), which is enough to provide the required temperature and salt resistance without overly complicating the polymerization process or creating excessive hydrophobicity that would reduce water solubility
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 acrylamide copolymer maintains high viscosity and reduces interfacial tension, allowing for improved deep profile control and flooding performance in challenging oil field conditions.
Implementation Method 1
subjecting the monomer mixture to a polymerization reaction in water under the conditions of solution polymerization and in the presence of an initiator, so as to obtain a copolymer colloid
Implementation Method 2
subjecting the copolymer colloid to a hydrolysis reaction to prepare the acrylamide copolymer
Implementation Method 3
can reduce the interfacial tension of oil-water surface, and exhibit desirable emulsifying property
Data Source
AI summary
The present disclosure relates to the technical field of oilfield chemicals, and discloses an acrylamide copolymer, wherein the acrylamide copolymer comprises a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A has a structure shown in Formula (1), the structural unit B has a structure shown in Formula (2), and the structural unit C has a structure shown in Formula (3) and/or Formula (4); wherein R1 is methyl or H, R2 is -OH, -NH2, -COOH or C2-C12 alkyl, n is an integer between 0 and 6, and a, b and c are each independently selected from integers between 0 and 2.