Polyacrylamide (HPAM) has good solubility and thickening properties,and is a commonly used thickener in fracturing fluids.However,conditions such as high temperature and high mineralization in oil and gas production limit its use.In order to solve this problem,hydrophobic associative polymer CIT with good temperature and salt resistance was synthesized by complexation-initiated polymerization,and the molecular structure of the synthesized polymer CIT was confirmed by infrared spectroscopy.The molecular structure of the synthesized polymer CIT was confirmed by infrared spectroscopy,and the water solubility,thickening and salt resistance of the CIT polymer were investigated.The results showed that the apparent viscosity of the CIT polymer solution initially decreased with the addition of sodium chloride.With further increase in salt concentration,the polarity of the CIT polymer solution also increased,and the intermolecular hydrophobic association was enhanced,leading to a denser structure of the hydrophobic association network and an increase in the apparent viscosity of the polymer solution.The viscoelasticity test showed that the viscoelasticity of the polymer solution first decreased and then increased with the increase of salt mass concentration.In addition,it had better temperature resistance,shear resistance and shear recovery compared to conventional HPAM.At the same time,CIT polymers can completely break the glue in industry standard time without residue.The advantages of CIT polymers include salt resistance,high temperature resistance and complete glue breakage.Therefore,it has great potential as a temperature--resistant and salt-resistant fracturing fluid thickener.
维普
万方数据
