聂仁仕,贾冉,蔡明金,等.双孔双渗油藏斜井压力动态特征分析[J].深圳大学学报理工版,2022,39(6):660-667.[doi:10.3724/SP.J.1249.2022.06660]
NIE Renshi,JIA Ran,CAI Mingjin,et al.Analysis on the pressure dynamic characteristics of slanted well in dual-porosity and dual-permeability reservoir[J].Journal of Shenzhen University Science and Engineering,2022,39(6):660-667.[doi:10.3724/SP.J.1249.2022.06660]
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双孔双渗油藏斜井压力动态特征分析
聂仁仕1，贾冉1，蔡明金2，李洪3，卢聪1，杨岚1

1.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;2.中石油天然气股份有限公司塔里木油田分公司勘探开发研究院，新疆库尔勒841000;3.中石油天然气股份有限公司塔里木油田分公司轮南油气开发部，新疆库尔勒841000

油田开发;裂缝性油藏;斜井;双孔双渗;渗流模型;压力动态

Analysis on the pressure dynamic characteristics of slanted well in dual-porosity and dual-permeability reservoir
NIE Renshi1，JIA Ran1，CAI Mingjin2，LI Hong3，LU Cong1，and YANG Lan1

1.State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan Province, P. R. China;2.Exploration and Development Research Institute, Tarim Oilfield Company, PetroChina, Korla 841000, Xinjiang Uygur Autonomous Region, P. R. China;3.Lunnan Oil&Gas Development Department, Tarim Oilfield Company, PetroChina, Korla 841000, Xinjiang Uygur Autonomous Region, P. R. China

oilfield development; fractured reservoirs; slanted well; dual-porosity and dual-permeability; flow model;pressure dynamics

DOI: 10.3724/SP.J.1249.2022.06660

备注

为了解裂缝性油藏斜井的双渗规律及其压力动态的变化特征，建立一个双孔双渗斜井渗流模型．利用Laplace变换、分离变量和点源函数叠加等方法对模型进行求解，获得了Laplace空间下模型的解析解．利用Matlab软件编程绘制一系列受裂缝系统与总系统渗透率比值等模型参数控制的双孔双渗油藏斜井压力动态特征曲线．利用绘制的压力动态特征曲线，识别斜井纯井筒储集效应、表皮效应、早期径向流、中期线性流、过渡流、基质向裂缝窜流和晚期径向流等7个渗流流动阶段．分析斜井、直井与水平井渗流特征曲线的差异，斜井比直井多了早期径向流和中期线性流阶段，且这两个流动阶段比水平井持续时间短．此外，分析了井斜角和斜井井长等参数对特征曲线的影响．井斜角、井长越大，曲线位置越低，早期径向流和中期线性流阶段越明显；裂缝渗透率比越大，窜流阶段越显著，窜流凹子越深．建立的模型及一系列压力动态特征曲线可以用于研究裂缝性油藏斜井的渗流特征．
In order to understand the dual-permeability flow law of slanted well in a fractured reservoir and study the characteristics of pressure dynamics, a flow model of slanted well in a dual-porosity and dual-permeability reservoir is established. The model is solved by Laplace transformation, separation of variables, and superposition of sink source functions, etc. The analytical solution of bottomhole pressure change in Laplace space is obtained. A series of pressure dynamic characteristic curves of slanted well in dual-porosity and dual-permeability reservoirs are programmed and drawn by Matlab software, which are controlled by varying model parameters such as the permeability ratio of fracture system to total system. Based on the pressure dynamic characteristic curves, seven flow regimes are identified, including pure well bore storage effect stage, skin effect stage, early radial-flow, middle linear-flow stage, transitional flow stage, inter-porosity flow stage from matrix to fracture and late radial flow stage. In particular, the differences of flow characteristic curves among slanted well, vertical well and horizontal well are analyzed. It is found that slanted well has more early radial-flow stage and middle linear-flow stage than the vertical well, and these two flow regimes have shorter duration than the horizontal well. In addition, the effect of inclination angle of well, well length and other parameters on the characteristic curve is analyzed. The larger the inclination angle and well length, the lower the curve position, the more obvious the early radial flow stage and the middle linear flow stage. The larger the permeability ratio of fracture system to total system is, the more significant the inter-porosity stage is and the deeper the inter-porosity concave is. The proposed analytical model and a series of pressure dynamic characteristic curves can be used to study the seepage characteristics of slanted wells in fractured reservoirs.
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