Rational perforaton of vertical wells in anisotropic formations
Is showed, that one of the reasons of incomplete expulsion of fluids wetting formation at twophase filtering are direction properties of filtration characteristics of the formation, caused by laminated (microlaminated) heterogeneity of its constitution, characteristic for the majority of formations-collectors of oil and gas. It is erected, that the magnitude of residual saturation by wetting phase at vertical filtrational move will be above magnitude of the residual saturation realised at filtrational move in a horizontal direction along a bench. It is demonstrated, that the direction of perforating channels in vertical wells in anisotropic formations should be chosen so that these channels intercepted a bench and in a vertical direction, that is that the angle between a direction of channels and hole axis (a normal to a bench) was sharp and provided capping by channels of all opened thickness of a header.