Method and device for stimulating a subterranean zone through the controlled injection of a fluid coming from a neighbouring zone which is connected to the subterranean zone by a drain

摘要

A subterranean zone and a neighbouring zone are, respectively, for example, a petroliferous deposit and an underlying aquiferous nappe at a fluid pressure higher than that prevailing in the subterranean zone. A method of stimulating production of effluent from the subterranean zone involves drilling at least one deflected drain (preferably nearly or totally horizontal) through the petroliferous zone, the neighbouring zone and an intermediate layer which separates the petroliferous zone from the aquiferous nappe. The intermediate layer is, for example, slightly permeable because of the presence of heavy and viscous hydrocarbon products. The drain is equipped with a pipe fitted with openings at the subterranean zone and at the neighbouring zone and with packer devices selectively positioned in the pipe. A controlled opening of one packer device during production allows injection of water under pressure into the subterranean zone in order to promote production of effluent therefrom.