甲酸铯钻井完井液的特性及应用

Properties of cesium formate based drilling and completion fluid and its application

李丽 刘伟

LI Li LIU Wei

中石化西南分公司工程技术研究院, 四川德阳 618000

Engineering Technology Institute, Sinopec Southwest Company, Deyang 618000, Sichuan, China

钻进高温高压油气井时,由于常规高密度钻井完井液中重晶石含量高、高温下聚合物易降解等原因,常常不能满足高温高压井的开发要求,而甲酸盐具有能在1.0~2.3 g/cm3之间自由调节钻井完井液密度、大大提高聚合物的高温稳定性、不易腐蚀钻具等优点,因此已成为大斜度井、小井眼深井等复杂井的理想钻井完井液体系。阐述了甲酸盐钻井完井液的使用概况、甲酸铯的物理性质、甲酸铯钻完井液的基本性质、甲酸铯钻完井液配方及性能。甲酸铯钻井完井液在国外多口高温高压油气井中的应用实例表明,其配方简单,具有优良的水力性能和流变性能,不仅能很好地满足钻井、完井需要,而且能很好地保护储层,对于解决国内目前高温高压井中存在的问题具有非常好的借鉴作用。

While drilling oil and gas wells with high temperature and high pressure,the conventional drilling and completion fluid with high density can not fulfill the requirement to develop such wells due to its high content of barite and degradable polymers under high temperature.Yet cesium formate is capable of freely regulating the density of drilling and completion fluid,greatly enhancing the high temperature stability of polymers,preventing the drilling tool from corrosion,when its density is between 1.0 and 2.3 g/cm3.Therefore,cesium formate based drilling and completion fluid has become an ideal drilling and completion fluid system for drilling complicated wells including highly deviated wells and deep slim hole wells.The application of the cesium formate based drilling and completion fluid,the physical properties of cesium formate,the basic features of the fluid,the formulation of the fluid and its performance are introduced in this paper.It has been applied to many oil and gas wells with high temperature and high pressure abroad.Results show that it features in simple formulation,excellent hydraulic and rheological performance.It can not only better fulfill the requirement of drilling and cementing,but also protect reservoir and can be a good reference to solving the problems of wells with high temperature and high pressure at present.

10.3969/j.issn.1000-7393.2007.03.029