Citation: LI Zhuomei, ZHANG Xuexin, XIE Zhiming, HUANG Yuhui. STRUCTURE-PROPERTY RELATIONSHIP OF POLYELECTROLYTES AND ITS APPLICATION IN STABILIZING DRILLING-MUD IN PRESENCE OF SALTS*[J]. Chinese Journal of Polymer Science, ;1990, 8(3): 204-210. shu

STRUCTURE-PROPERTY RELATIONSHIP OF POLYELECTROLYTES AND ITS APPLICATION IN STABILIZING DRILLING-MUD IN PRESENCE OF SALTS*

Received Date: 30 September 1988

A new polyelectrolyte (SPU) has been prepared. It can depress the water-loss of drilling-mud much more effective than the commonly used acrylic polyelectrolytes even in 30% NaCl solution. SPU has phenyl group in the backbone with -SO3- in the side chain while the acrylic polyelectrolytes have C—C and -COO- respectively, there exists an intrinsic relationship between the structure of polymer and its tolerance to salts, it has been found: 1) The adsorption amount of polymer on clay is related closely to the flexibility of polymer chain.2)The salt-tolerance of -SO3- is superior to -COO-.3) Both SPU - mud and HPAN - mud are plastic fluids.The dependence of yield point on salts to the molecular weight of polymer and hydration of ionogenic group,which is quite different for SPU - mud and HPAN - .4) The extent of raising zeta- potential of base- mud by SPU is greater than by HPAN,but the extent of dropping zeta-potential of SPU - mud by NaCl is smaller than HPAN -mud.According to these results we suppose the salt-tolerance of SPU-mud is attributed mainly to hydration of-SO3- and that of HPAN - mud mainly to network structure formed in the driling - mud.
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