Synthesis and mechanism of high temperature and high salt fluid loss reducer based on multi-arm structure
Hyperbranched polymer fluid loss reducer JHPAN with multi-arm structure was synthesized with pentaerythritol al-lyl ether as the core.The rheological properties,fluid loss reduction performance and fluid loss mechanism of drilling fluid prepared with JHPAN under high temperature and high salt conditions were studied and analyzed.The results show that when the dosage(mass fraction)is 1.0%,the apparent viscosity of fresh water drilling fluid before and after aging at 220℃is 10.5 and 10.0 mPa·s,the plastic viscosity is 9.0 and 11.0 mPa·s,and the dynamic shear force is 1.5 and 1.0 Pa,re-spectively.At the dosage of 1.0%,after aging at 220℃for 16 h,the API filtration and HTHP filtration of saturated NaCl brine drilling fluid are 11.8 and 25.5 mL,respectively.The multi-arm structure of JHPAN contains a large number of ad-sorption groups and temperature-resistant and salt-resistant groups,which contributes to the formation of dense mud cake un-der high temperature and high salt environment of drilling fluid,thus improving its filtration reduction effect.
drilling fluidhigh temperaturehigh salt contenthyperbranched polymerfluid loss reducer
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