摘要
高温深井钻井,井下钻井液高温流变性能好坏直接关系到井眼的安全和钻井的成败,但六速黏度计无法测试钻井液在井底随着温度、压力、剪切速率、时间等参数的变化,流变性能是如何变化的,通过高温高压流变仪评价钻井液的流变和抗温性能是一种科学而有效的评价手段。为模拟井下实际钻井液性能,建立了低剪切速率黏度测试、高温下黏度损失率测试、钻井液动态循环和静置时黏度随时间变化的测试方法,表征了钻井液的携岩性能、抗温流变性能、钻井液循环和静置条件下的高温热稳定性能,反映出了井下真实流变性能。在埕探1井进行了现场试验,说明该测试方法可以为现场工程师分析判断钻井液在井下高温下的性能能否为钻井施工提供实验数据,为高温钻井液体系优化设计、处理剂研发和应用提供科学可靠实验方法,并极大程度上弥补用六速黏度计测试钻井液流变性能的不足和缺陷。
Since the six-speed direct reading viscometer is unable to measure the change of mud rheology with downhole temperature,downhole pressure,downhole shear rate and time,drilling fluid researchers turn to the high temperature high pressure(HTHP)rheometer for evaluating the rheology and thermal stability of drilling fluids,hoping that it will give more scientific and effective test results.To simulate the actual mud properties downhole,several test methods are established,which are test of low shear rate viscosity,test of loss of viscosity at high temperatures and test of changes of mud viscosity with time at dynamic and static conditions.These tests are used to characterize the cuttings carrying capacity,rheology at elevated temperatures and high temperature stability of drilling fluids at dynamic and static conditions,the test results can reveal the actual rheology of the drilling fluids downhole.Field application of the HTHP rheometer in testing the properties of the organic salt drilling fluid used in drilling the well Chengtan-1 indicated that the test method can be used to provide field engineers with accurate data for judging whether the mud properties can meet the requirements of drilling operation under high bottomhole temperatures.The test method and the HTHP rheometer have provided a scientific and reliable way of designing,developing and using high temperature drilling fluids and mud additives,and greatly made up for the shortcomings and defects of using the six-speed viscometer to measure the rheology of drilling fluids.
作者
刘晓栋
刘涛
LIU Xiaodong;LIU Tao(Drilling Research Institute,Offshore Engineering Company Limited,CNPC,Tianjin 300451;Drilling Engineering Division,Offshore Engineering Company Limited,CNPC,Tianjin 300280)
出处
《钻井液与完井液》
CAS
北大核心
2021年第3期280-284,共5页
Drilling Fluid & Completion Fluid
基金
中国石油集团公司科技重大专项“高温高密度钻井液与可排放海水基钻井液成套技术研发”(2014E-38-02)
中国石油集团海洋公司科技项目“海上环保型防塌抗高温钻井液体系研究与应用”(HK-Z-20-2)部分研究成果。
关键词
深井
抗高温钻井液
高温高压
流变性能
黏度
Deep well
High temperature resistant drilling fluid
High temperature high pressure
Rheology
Viscosity
