高温高压耦合条件下油基钻井液的流变特性规律及其数学模型  

Rheological Characteristics of Oil Base Drilling Fluids and Its Mathematical Model under Coupled HTHP Conditions

作　　者：谢春林 杨丽丽[1] 蒋官澄[1] 敖天 曹峰 贺垠博[1] 聂强勇 XIE Chunlin;YANG Lili;JIANG Guancheng;AO Tian;CAO Feng;HE Yinbo;NIE Qiangyong(State Key Laboratory of Petroleum Resources and Prospecting,Key Laboratory of Petroleum Engineering(Ministry of Education),China University of Petroleum,Beijing 102249;Zhanjiang Branch of CNOOC China Ltd.,Zhanjiang,Guangdong 524057;Drilling Fluid Technology Service Company,CNPC Chuanqing Drilling Engineering Company Limited,Chengdu,Sichuan 610051)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室·石油工程教育部重点实验室,北京102249 [2]中海石油(中国)有限公司湛江分公司,湛江524057 [3]中国石油集团川庆钻探工程有限公司钻井液技术服务公司,成都610051

出　　处：《钻井液与完井液》2021年第5期568-575,共8页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金-面上项目“聚合物拓扑结构和序列结构影响其流变调节能力的机理及结构优化研究”(51874329)。

摘　　要：为了探究高温、高压耦合条件下温度、压力对油基钻井液流变性能的影响规律,利用超高密度高温高压钻井液流变仪Fann iX77分别测试了各个高温、高压耦合条件下密度为1.4、1.8、2.2、2.4 g/cm^(3)的抗高温油基钻井液体系的流变特性。结果显示,油基钻井液表观黏度和塑性黏度随温度的升高而逐渐降低,随压力的增大而逐渐增大;动切力随温度的升高表现出先增高后降低的趋势;当温度超过一定值时(160℃左右),高温作用对各个高密度油基钻井液流变性的影响都将大大减弱。将所测得的各个高温、高压耦合节点条件下的流变参数进一步分析后得到油基钻井液的温度、压力二元数学模型,误差分析结果显示,该模型对各密度体系的实验测量数据均具有良好的拟合性,可决系数R均大于0.96,因此该数学模型能够较为精确地预测出各个温度、压力耦合条件下油基钻井液的流变性能。To investigate the effects of temperature and pressure on the rheological characteristics of oil based drilling fluids under coupled high temperature and high pressure,the rheology of four high temperature oil based drilling fluids with densities of 1.4 g/cm^(3),1.8 g/cm^(3),2.2 g/cm^(3) and 2.4 g/cm^(3) was measured at coupled high temperature high pressure conditions with a Rheometer Fann iX77 which is able to measure the rheology of drilling fluids with ultra-high densities at elevated temperatures and pressures.It was found that the apparent viscosity and the plastic viscosity of the four oil based drilling fluids gradually decrease with increase in temperature and gradually increase with increase in pressure.The yield points of the four drilling fluids first increase and then decrease with increase in temperature.When the temperature was increased to above about 160℃,the effect of high temperature on the rheology of the four drilling fluids was greatly weakened.In addition,a mathematical model involving temperature and pressure of the oil based drilling fluids was obtained based on the analyses of the rheological parameters measured of the four drilling fluids under coupled high temperature and high pressure.Error analysis results show that the model has a good fit to the measured parameters in the experiment of the drilling fluids with different densities,with the coefficient of determination R being greater than 0.96.It is thus determined that the mathematical model can be used to accurately predict the rheological characteristics of oil based drilling fluids under each coupled temperature and pressure condition.

关 键 词：油基钻井液 流变性 高温、高压耦合 数学模型 

分 类 号：TE254[石油与天然气工程—油气井工程]