新型气井压井液CMPC的研究与应用

THE PERFORMANCE EVALUATION AND FIELD TESTS OF GAS WELL CONTROL FLUID CMPC

本文介绍了新型气井压井液主剂ＣＭＰＣ（改性羧甲基纤维素）的化学特征，考察了ＣＭＰＣ压井液的性能，报导了该压井液的矿场试验情况。室内与矿场试验结果表明，该压井液的滤失量低，能耐受１４０℃的高温，密度可调范围为１．０－１．３５ｇ／ｃｍ３，对地层的伤害小，可回收并重复使用，能满足大庆油田的使用要求。

The main component of the gas well control fluid CMPC is a mixed cellulose ether-carboxymethyl hydroxyoxyisopropyl cellulose,CMPC,which is more water-soluble and viscosity-enhancing than CMC.The filtrate loss of the fluid CMPC is an order of magnititude lower,its temperature tolerence is much higher(up to 140℃) and its shear resistance is better comparing with other fluids(CMC,HEC,ZR,and BSP).It is compatible well with the formation water and has adjustible values of density l.0-l.35g/cm3.The field tests in two gas wells over 13 and >65 days are successful.The fluid CMCP is reusable.