Effect of spacer on the performance of Gemini betaine surfactant in clean fracturing fluid
Gemini betaine surfactants have the advantages of low pollution and low damage,which can be used in clean fracturing fluids for oilfield development.In this work,three Gemini betaine surfactants GAS-22-n(n=IPDI,HDI and TDI)with different spacers were synthesized by using erucic acid,N,N-dimethyl-1,3-propanediamine and sodium 3-chloro-2-hydroxypropanesulfonate as raw materials,and hexamethylene diisocyanate,toluene diisocyanate and isophorone diisocyanate as spacers.The effects of spacers on the properties were studied.The experimental results showed that,the long carbon chain of the spacer in GAS-22-HDI structure was flexible and easy to bend,exhibiting strong intermolecular interactions and being less influenced by external forces,which made it easier to form micelles and have good salt resistance,low surface tension and low cmc.The rigid benzene ring in GAS-22-TDI structure had a larger volume,and the micelles fused to form wormlike aggregates,further forming a dense three-dimensional network structure,endowing it with good temperature resistance,shear resistance,sand suspension,and viscosity.
国家科技期刊平台
NSTL
万方数据
维普
