Segmental flow-control method for flow-control filter string in oil-gas well and oil-gas well structure

Abstract

A segmental flow-control method for a flow-control filter string in an oil-gas well and an oil-gas well structure are disclosed. The oil-gas well includes a well wall(), a casing() located in the well wall(), a cement sheath() provided between the casing() and the well wall(), channeling path() existing outside the casing(), and a plurality of perforated tunnels () passing through the casing(), the cement sheath() and/or the channeling path() and into a formation from the inside of the casing to the formation. The segmental flow-control method for the flow-control filter string() includes the following steps: running the flow-control filter string() into the casing, wherein the flow-control filter string() is provided with a flow-control filter (), and an annular space is at least partially formed between the flow-control filter string() and the casing(); injecting a particle-carrying liquid carrying anti-channeling flow pack-off particles into the annular space through a particle-carrying liquid injecting passage, thus the particle-carrying liquid carries the anti-channeling flow pack-off particles into the annular space, and enters the channeling path() through the perforated tunnels(); and sealing the particle-carrying liquid injecting passage or closing a communicating part between the particle-carrying liquid injecting passage and the annular space.