Method, downhole system and fluid laden with particles to form a barrier or restriction in a wellbore flow channel

摘要

A method of forming a barrier or restriction 62 in a flow channel 14, outside a liner 12 in a wellbore, including the steps of expelling a first fluid V1 laden with first particles from a first opening 22 in the liner into the flow channel, expelling a second fluid V2 into the flow channel affecting the flow of the first fluid wherein a barrier or restriction is formed by the settling and aggregation of the particles. The second fluid may be expelled at a second location. The second fluid may be laden with second particles. Where the first particles settle and aggregate is affected by controlling parameters such as, particle density, grain size and shape and the density and flow rate of the fluids. The apparatus for carrying out the method may include packers and the particles may be buoyant and magnetisable.