Patent ID: 9151142
Filing Date: 2015-10-06
Classification: E21B

Abstract:
1. A segmental flow-control method for a flow-control filter string in an oil-gas well, wherein the oil-gas well comprises a well wall and a sand control screen already run within the well wall, and a clearance exists between the sand control screen and the well wall; the segmental flow-control method for the flow-control filter string comprises the following steps: running the flow-control filter string: running the flow-control filter string into the sand control screen, wherein the flow-control filter string is provided with flow-control filters, and an annular space is formed between the flow-control filter string and the sand control screen; filling with anti-channeling flow pack-off particles: injecting a particle-carrying liquid carrying the anti-channeling flow pack-off particles into the annular space through a particle-carrying liquid injection passage, wherein the particle-carrying liquid carries the anti-channeling flow pack-off particles into the annular space and the clearance; sealing: sealing the particle-carrying liquid injection passage or closing a communicating portion between the particle-carrying liquid injection passage and the annular space; and establishing a flowing channel before the step of running the flow-control filter string by forming on the sand control screen, at least one flowing channel allowing the particle-carrying liquid carrying the anti-channeling flow pack-off particles to enter the clearance from the annular space or directly through the particle-carrying liquid injection passage.