摘要
针对海上疏松砂岩注水井周围经长期冲刷易发育大孔道的问题,通过引入Barree-Conway模型对大孔道内高速非达西渗流进行描述,采用迭代方法对高速非达西渗流导致的强非线性问题进行处理,并结合线源、Laplace变换及数值离散方法构建考虑高速非达西渗流的发育多条大孔道的注水直井试井解释模型,并对典型压力动态曲线及相关参数的影响展开分析。研究结果表明:①考虑高速非达西渗流的发育多条大孔道的注水直井不稳定试井半解析模型可以有效处理多条大孔道发育及大孔道内的高速非达西渗流,且计算结果更加可靠。②发育多条大孔道的注水直井的典型压力曲线可划分为井储、过渡段、双线性流、线性流、大孔道干扰及径向流等6个流动阶段。考虑高速非达西渗流后,早期压力及压力导数曲线均明显向上移动,近井大孔道内导流能力出现明显下降。随着大孔道数量的增多,压力及压力导数曲线明显下移,同时大孔道内高速非达西渗流的影响程度减小。③将此模型应用于渤海油田注水井参数解释,可实现大孔道的定量表征。
To focus on the issue of high permeability flow channels developed upon long-term strong water erosion in offshore unconsolidated sandstone,the Barree-Conway model was employed to describe the highvelocity non-Darcy flow within flow channels.An iterative method was adopted for the strong nonlinearity caused by high-velocity non-Darcy flow.Then a pressure transient model of vertical injection well with multi flow channels considering high-velocity non-Darcy flow was obtained through line source,Laplace transforma tion and numerical discretization methods,and the typical pressure dynamic curves and related parameters were analyzed.The results show that:(1)The semi-analytical model for unstable well-testing in vertical injection well with multi flow channels considering high-velocity non-Darcy flow can effectively address both the development of multi high permeability flow channels and high-velocity non-Darcy flow within these channels,and the calculation results are more reliable.(2)The typical pressure curves of vertical injection well with multi flow channels can be divided into six flow stages:wellbore storage,transition flow,bilinear flow,linear flow,flow channel interference,and radial flow.When high-velocity non-Darcy flow is considered,both the early stage pressure and pressure derivative curves move up significantly,and the flow conductivity capacity of the multi flow channels near wellbore shift down significantly.As the numbers of flow channels increase,the pressure and pressure derivative curves decrease significantly,while the influence of high-velocity non-Darcy flow within the flow channels diminishes.(3)The model was successfully applied to the parameters interpretation of an injection well in Bohai Oilfield,then the quantitative characterization of flow channels can be achieved.
作者
崔永正
周文胜
未志杰
姜瑞忠
CUI Yongzheng;ZHOUWensheng;WEI Zhijie;JIANG Ruizhong(State Key Laboratory of Offshore Oil and Gas Exploitation,Beijing 102209,China;CNOOC Research Institute Co.,Ltd.,Beijing,102209,China;School of petroleum engineering,China University of Petroleum(East China),Qingdao,266580,Shandong,China)
出处
《岩性油气藏》
北大核心
2025年第5期193-200,共8页
Lithologic Reservoirs
基金
国家自然科学基金面上项目“基于非均衡理论的海上稠油化学驱大幅提高采收率关键问题研究”(编号:52074347)
中国海洋石油集团公司“海洋油气高效开发重点实室主任基金(2024)”(编号:KJQZ-2024-2101)
中国海洋石油有限公司十四五重大课题“海上双高—双特高水驱油田提高采收率油藏关键技术”(编号:KJGG2021-0501)联合资助。
关键词
注水直井
大孔道
高速非达西渗流
线源
Laplace变换
数值离散方法
试井解释模型
迭代求解
vertical injection well
large pore channel
high-velocity non-Darcy flow
line source
Laplace transformation
numerical discretization methods
well testing interpretation model
iterative method
