海上超高温高压钻井井筒温度压力场耦合研究  

Coupling analysis of wellbore temperature and pressure field in offshore extreme high pressure-high temperature drilling

作　　者：张万栋 罗鸣 吴江 韩成 向世林 张智[2] ZHANG Wandong;LUO Ming;WU Jiang;HAN Cheng;XIANG Shilin;ZHANG Zhi(CNOOC China Limited Zhanjiang Branch,Zhanjiang Guangdong 524057,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu Sichuan 610500,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《中国安全生产科学技术》2023年第1期128-135,共8页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(U22A20164,52074234);四川省青年科技创新研究团队专项计划项目(2020JDTD0016)。

摘　　要：为研究海上超高温高压钻井井筒温度压力的变化规律,基于流体力学和传热学理论,考虑超高温高压井筒环境对钻井液密度以及钻井液流变参数的影响,建立海上超高温高压钻井井筒温度压力耦合预测模型,并利用实例井现场随钻数据进行模型验证,分析正常钻进期间井筒温度压力的变化规律。研究结果表明:对井筒温度而言,钻井液流变性变化的影响大于钻井液密度变化的影响,耦合计算温度结果要大于不耦合计算的温度值,且两者之间的温差随井深的增加越来越大;对井筒压力而言,钻井液密度变化对当量循环密度ECD(equivalent criculating density)的影响要大于流变性对ECD的影响,且耦合计算的ECD要小于不耦合计算的ECD值。该耦合模型可以提高井筒温度压力的预测与控制精度,并降低超高温高压地层窄密度窗口中的安全钻进风险,研究结果对超高温高压钻井精准的井筒温度压力预测及控制具有重要意义。In order to study the variation law of wellbore temperature and pressure in offshore extreme high pressure-high temperature(extreme HPHT)drilling,based on the theories of hydrodynamics and heat transfer,and considering the influence of extreme HPHT wellbore environment on the drilling fluid density and rheological parameters of drilling fluid,a coupling prediction model of wellbore temperature and pressure in offshore extreme HPHT drilling was established.The model was verified by using the field data while drilling of example wells,and the variation law of wellbore temperature and pressure during normal drilling was analyzed.The results showed that for the wellbore temperature,the influence of drilling fluid rheology change was greater than that of drilling fluid density change,the temperature result of coupled calculation was greater than that of uncoupled calculation,and the temperature difference between them increased with the increase of well depth.For the wellbore pressure,the influence of drilling fluid density change on equivalent circulating density(ECD)was greater than that of rheology,and the ECD of coupled calculation was less than that of uncoupled calculation.The coupling model could improve the prediction and control accuracy of wellbore temperature and pressure,and reduce the risk of safe drilling in the narrow density window of extreme HPHT formation.The results are of great significance to the accurate prediction and control of wellbore temperature and pressure in the extreme HPHT drilling.

关 键 词：超高温高压井 窄安全密度窗口 温度压力耦合 钻井液密度 钻井液流变性 

分 类 号：TE21[石油与天然气工程—油气井工程] X937[环境科学与工程—安全科学]