裂缝性砂岩储层表皮因数分解方法研究

Decomposition of Skin Factors for Fractured Sandstone Reservoirs

研究了单相不可压缩流体在裂缝性砂岩储层中作单向线性渗流时总系统表皮因数与裂缝系统表皮因数、基质系统表皮因数之间的关系。裂缝系统的表皮因数与总系统表皮因数、基质系统表皮因数、总系统渗透率、基质系统渗透率及面缝率有关。当裂缝发育时,总表皮因数与裂缝系统的表皮因数近似相等。即总表皮因数只取决于裂缝系统的表皮因数,而与基质系统表皮因数大小无关。当裂缝发育时,酸化解堵等措施只需针对裂缝系统来进行,不需考虑基质系统污染情况。该文研究为正确评价和改造裂缝性砂岩油气层提供了理论依据。

The relationship between the total skin factors and skin factors of fractured reservoirs and the matrix system were studied for single-phase incompressible fluid in fractured sandstone reservoirs.The skin factors of fracture system were related with the total skin factors of the system,skin factors of matrix system,the total system permeability,the matrix system permeability and the fracture-areal rate.When the fractures grew,the total skin factors were approximately equal to those of the fracture system,that was the total skin factor depended only on the skin factors of fracture system,and were independent of the matrix system.The acidizing and the other measures were carried out only for the fracture system,without considering the pollution of matrix system of the sandstone reservoirs with fracfture growth.It provides a theoretical basis for correct evaluation and transformation of fractured reservoirs.