【摘要】 现在的石油钻井技术要求聚阴离子纤维素(简称PAC)具有更好的抗盐、抗钙、抗高温性能和明显的增粘作用。阐述了PAC的制备原理,从抑制副反应考虑,对精制棉中的聚合度、α-纤维素含量和氯乙酸中一氯乙酸含量进行了一系列的试验,从而研制出了具有降滤失性能和明显增粘作用的PAC。制备这种PAC,所采用的原料是:聚合度>2200(最好是>2300)、α-纤维素含量>98%(最好是>99%)的精制棉和一氯乙酸含量>97%(最好是>98%)的氯乙酸。更多还原

【Abstract】 Current drilling technology requests that polyanionic cellulose (PAC) has better properties to tolerate salt, calcium, high temperature, and enhance mud viscosity remarkably. This paper states the synthetic principle of PAC. Considering the control of by-reaction, we did a series of tests about degree of polymerization andα-cellulose content in refined cotton, and about monochloroacetic acid (MCA) content in chloroacetic acid, so as to prepare the improved PAC with excellent rheology, reducing filtration rate and high viscosity. The research demonstrates that it is requested for preparing this PAC with excellent performance to use refined cotton with degree of polymerization >2200, the best range >2300 andacellulose content >98%, the best range >99%; and to use chloroacetic acid with MAC content >97%, the best range >98%.更多还原