天然气工业2024，Vol.44Issue(2)：132-144,13.DOI:10.3787/j.issn.1000-0976.2024.02.013
基于压力—速度解耦的深水井筒多相流高精度数值模拟新算法
New algorithm for high-precision numerical simulation of multiphase flow in deepwater wellbore based on pressure-velocity decoupling
摘要
Abstract
In the process of deepwater well drilling and completion,the complex sea water and seabed geological conditions require high-precision wellbore pressure control and increase the control difficulty.The high-precision and high-stability multiphase flow simulator of deepwater wellbore has become the key to realize the fine control of wellbore pressure.In order to address the difficulty in predicting the high dynamic flow system in deepwater wellbore,aiming at the drift flow model of multiphase flow in deepwater wellbore,this paper integrates the flux splitting method of advection upstream splitting method(AUSMV)with the staggered grid technology,optimizes the high stiffness of pressure-density decoupling,and hence forms a numerical algorithm of pressure-velocity decoupling.Then,the precision of the numerical algorithm is improved using OMUSCL2 space reconstruction + two-step Runge-Kutta time reconstruction technology.Finally,a high-precision numerical algorithm for multiphase flow in deepwater wellbore is established,and its precision and performance are verified.And the following research results are obtained.First,compared with the conventional AUSMV algorithm,the new algorithm has lower numerical dissipation,stronger ability to capture discontinuous physical information,and higher position recognition degree of gas-liquid two-phase leading edge in the wellbore.Second,compared with the blowout experiments with gas injection rate of 10×104 m3/d and 15×104 m3/d,the average error of the bottom hole pressure simulated by the new algorithm is 1.79%and 1.86%,respectively.Third,the new algorithm shows good stability and robustness in simulating the intense expansion of wellhead gas and the supersonic flow.In conclusion,the new algorithm not only improves the precision of conventional numerical algorithm,but also provides effective technical support for wellbore pressure control of the complex high dynamic flow system,which is conducive to improving the theoretical level of deepwater wellbore pressure control and ensuring the efficient development of deepwater oil and gas in China.关键词
深水/多相流/压力—速度解耦/OMUSCL2/AUSMV/交错网格Key words
Deepwater/Multiphase flow/Pressure-velocity decoupling/OMUSCL2/AUSMV/Staggered grid引用本文复制引用
娄文强,王志远,孙大林,张剑波,孙小辉,孙宝江..基于压力—速度解耦的深水井筒多相流高精度数值模拟新算法[J].天然气工业,2024,44(2):132-144,13.基金项目
国家自然科学基金基础科学中心项目"超深特深层油气钻采流动调控"(编号:52288101),国家自然科学基金青年基金"深海多气合采井筒中水合物流动障碍形成机制与实时监测方法研究"(编号:52304016)、"海域天然气水合物水平井开采井筒—地层交界面弱化与失稳机理"(编号:52104056),山东省重大科技创新工程项目"深水复杂钻井多相流动模拟关键技术与监测装备"(编号:2022CXGC020407),山东省自然科学基金项目"基于井筒—储层耦合的海域水合物水平井开采井眼界面弱化失稳机理研究"(编号:ZR2021QE155),油气钻采工程湖北省重点实验室开放课题"救援井压井多相流动时空演化机制与参数优化设计方法"(编号:YQZC202301). （编号:52288101）
