Device and a method for selective control of fluid flow between a well and surrounding rocks

A device and a method for selective control of fluid flow between a flow pipe of a well and surrounding rocks. The flow pipe is provided with at least one flow-through particle filter placed externally on the flow pipe and between the flow pipe and the rocks. The filter is connected in a flow-through manner to the flow pipe via a flow channel. The characteristic of the invention is that the flow pipe is provided with an imperforated pipe wall inside of and vis-a-vis said flow channel when installing the flow pipe in the well. Then the flow pipe may be perforated selectively inside of the flow channel for one or several filters along the flow pipe, whereupon fluids may flow through the flow channel and the filter via perforation apertures in the flow pipe.