METHOD OF CONSTRUCTING WELL OF MULTILAYER OIL FIELD Russian patent published in 2000 - IPC

FIELD: oil-producing industry; methods of well construction in multilayer oil filed. SUBSTANCE: method provides for drilling well to planned depth, lowering of casing string and its cementing. After drilling-in of the first oil layer, well is cased. Then well drilling is continued by bit of smaller diameter to drill-in the other producing layers with subsequent cementing of drilled part of well. The last pipes of casing liner passing the first oil-bearing layer are selected from easily drilled material, for instance, glass-reinforced plastic. Prior to well cementing, installed against producing layer is disconnector which is lowered into well as casing string component with subsequent cementing of well disconnected part under or above the disconnector. EFFECT: preserved reservoir properties of producing layer. 2 dwg