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超临界CO2钻井井筒内流动参数变化规律
孙宝江,孙小辉,王志远,王金堂,刘书杰,夏强,蔡德军
0
(中国石油大学石油工程学院,山东青岛 266580;中海油研究总院,北京 100028;中国石油集团海洋工程有限公司钻井事业部,天津 300280)
摘要:
优选适用于超临界CO2钻井井筒温度和压力条件下的CO2物性参数计算方法,基于井筒中CO2的物性变化规律,以比焓为研究对象,建立超临界CO2钻井井筒流体流动控制方程组,分析超临界CO2流体物性参数变化对井筒内流动规律的影响。计算结果表明:在超临界CO2钻井井筒温度和压力条件下,采用Span-Wagner方法和V-W方法计算CO2的物性参数平均计算误差最小,分别在0.5%和1.5%以内,相对于其他方法计算精度更高;随井深的增加,钻杆内和环空中CO2密度、黏度和导热系数逐渐减小,比热容先增大后减小;受物性参数变化的影响,环空流体流速和动能沿井深逐渐增大,携岩能力逐渐增强,流体压力沿井深的变化趋势呈非线性;忽略密度、黏度、比热容、导热系数等物性参数的变化会导致CO2携岩能力、井底压力和井筒温度分布的计算误差,算例中各误差分别在10.7%、7.9%和1.1%以内。
关键词:  钻井  超临界二氧化碳  热物性参数  携岩能力  温度和压力分布
DOI:10.3969/j.issn.1673-5005.2016.03.011
投稿时间:2015-05-12
基金项目:国家自然科学基金项目(51104172,U1262202);中央高校基本科研业务费专项(15CX06020A);中海石油(中国)有限公司综合科研项目(YXKY-2015-ZY-12)
Flow behavior analysis during supercritical CO2 drilling:consideration of varying thermo-physical properties of CO2 in wellbore
SUN Baojiang,SUN Xiaohui,WANG Zhiyuan,WANG Jintang,LIU Shujie,XIA Qiang,CAI Dejun
(School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;CNOOC Research Institute, Beijing 100028, China;Drilling Division, CNPC Offshore Engineering Company Limited, Tianjin 300280, China)
Abstract:
In order to calculate the thermo-physical parameters of CO2, in wellbore under varying pressure and temperature conditions, the governing flow equations of fluids in wellbore were established based on specific enthalpies, in which the variations of the thermo-physical properties of supercritical (SC) CO2 and their influence on fluid flow can be studied. The results of case studies show that the average errors using the Span-Wagner and V-W equations for calculating CO2 's properties are within 0.3% and 1.5%, respectively, which are better than other methods in the temperature-pressure range considered during SC-CO2 drilling. The density, viscosity and thermal conductivity of CO2 in wellbore decrease with the depth increasing, while its heat capacity increases firstly, and then declines. Because the variation of thermo-physical properties CO2 along the wellbore, the velocity, kinetic energy of the fluid, and its cuttings carrying capability increase from wellhead to bottom hole, and the borehole pressure varies nonlinearly along the wellbore. The accuracy of the flow behavior analysis for SC-CO2 can be greatly improved via considering its variable thermo-physical properties in wellbore, otherwise, errors over 10.7%, 7.9% and 1.1% can be raised when calculating the cuttings carrying capability, bottom hole pressure and wellbore temperature distribution, respectively.
Key words:  drilling  supercritical CO2  thermo-physical properties  cuttings carrying capability  temperature and pressure distribution
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