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

An oil-gas well structure, comprising:

• a well wall,
• a casing located in the well wall,
• a cement sheath provided between the casing and the well wall, and
• a channeling path existing outside the casing;
• wherein a plurality of perforated tunnels pass through the casing, the cement sheath and/or the channeling path and into a formation from the inside of the casing to the formation;
• and
• the flow-control filter string is run into the casing, the flow-control filter string is provided with flow-control filters, and an annular space between the flow-control filter string and the casing as well as the channeling path outside the casing are filled with the anti-channeling flow pack-off particles.

A segmental flow-control method for a flow-control filter string in an oil-gas well with a channeling path existing outside a casing, wherein the oil-gas well with the channeling path existing outside the casing comprises a well wall of the oil-gas well, a casing being already run into the oil-gas well, a cement sheath being provided between the casing and the well wall, and the channeling path being a channeling flow passage formed by a vacancy not filled with cement outside the casing, wherein a plurality of perforated tunnels pass through the casing, the cement sheath and 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:
• 1) running the flow-control filter string into the casing by means of a run-in string, wherein the flow-control filter string is provided with a flow-control filter, and an annular space is formed between the flow-control filter string and the casing;
• 2) injecting the particle-carrying liquid carrying the anti-channeling flow pack-off particles into the annular space between the flow-control filter string and the casing;
• the particle-carrying liquid carries the anti-channeling flow pack-off particles into the annular space between the flow-control filter string and the casing, and into the channeling path outside the casing via the perforated tunnels;
• and the anti-channeling flow pack-off particles simultaneously fill, accumulate in and fully stuff the annular space between the flow-control filter string and the casing as well as the channeling path outside the casing;
• 3) sealing the annular space between the upper portion of the flow-control filter string and the casing;
• 4) disconnecting the run-in string connected to the flow-control filter string, thereby forming a completion well structure wherein both the annular space between the flow-control filter string and the casing and the channeling path outside the casing are fully stuffed with the anti-channeling flow pack-off particles.