SEGMENTAL FLOW-CONTROL METHOD FOR FLOW-CONTROL FILTER STRING IN OIL -GAS WELL AND OIL-GAS WELL STRUCTURE

摘要

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(1), a casing(2) located in the well wall(1), a cement sheath(3) provided between the casing(2) and the well wall(1), channeling path(5) existing outside the casing(2), and a plurality of perforated tunnels (6) passing through the casing(2), the cement sheath(3) and/or the channeling path(5) and into a formation from the inside of the casing to the formation. The segmental flow-control method for the flow-control filter string(7) includes the following steps: running the flow-control filter string(7) into the casing, wherein the flow-control filter string(7) is provided with a flow-control filter (8), and an annular space is at least partially formed between the flow-control filter string(7) and the casing(2); 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(5) through the perforated tunnels(6); and sealing the particle-carrying liquid injecting passage or closing a communicating part between the particle-carrying liquid injecting passage and the annular space.