渗透率各向异性疏松砂岩脱砂压裂产能流固耦合模拟

fluid-solid coupling simulation of deliverability of screen-out fracturing in permeability anisotropy unconsolidated sandstone

关键词:  渗透率  各向异性  疏松砂岩  压裂产能  流固耦合

Key words:  permeability  anisotropy  unconsolidated sandstone  fracturing deliverability  fluid-solid coupling

摘要:

基于广义达西定律,建立渗透率各向异性疏松砂岩脱砂压製人工裂缝-油藏系统流固耦合模型,对储层渗透率 各向异性对储层流固耦合作用及压裂井生产动态的影响进行分析。结果表明:储层渗透率各向异性会显著影响储 层有效应力及物性参数的变化及分布;近裂缝壁面处,人工裂缝及渗透率各向异性共同影响储层物性参数变化，远 离裂缝处,渗透率各向异性对储层参数变化起主导作用;当储层渗透率主轴方位角由0°增大至90°时,压裂井日产油 量先增加后减小,当方位角达到60°左右时日产油量最大;当渗透率主轴方位角为0°时,垂直缝长方向的油藏渗透率 对压裂井产能影响较大。

Abstract:

A fluid-solid coupling model for the artificial fracture formed by top screen-out fracturing and reservoir system in permeability anisotropy unconsolidated sandstone was established based on generalized Darcy law. And the effects of permeability anisotropy of reservoir on the fluid-solid coupling effect and production performance of fractured well were analyzed. TTie results show that the permeability anisotropy of reservoir influences the alteration and distribution of effective stress and physical parameters of reservoir dramatically. The artificial fracture and permeability anisotropy influence the alteration of reservoir parameters simultaneously near the fracture surface，and the penneability anisotropy dominates the alteration of reservoir parameters far from the fracture. Tlie daily oil production increases firstly and then decreases with the increment of the azimuth of permeability principal axis ￡rora 0° to 90°, and the daily oil production is maximal with the azimuth about 60°. Tlie penneability < the fracturing deliverability dramatically when the azimuth of permeability principal axis equals 0。.