Selective Production String and Working Method of Multi-Stage Fracturing Horizontal Well Completion with Casing

Abstract

The invention discloses a casing completion multi-stage fracturing horizontal well selective exploitation pipe string and a working method thereof, which are designed for realizing the selective and stage-by-stage exploitation of the horizontal well. The outer part of the tubing string is connected to the multi-stage packer that separates the casing; the inner part of the tubing is connected to the deep well pump, the sealing cannula, the constant pressure valve and the sealing cylinder of each section of the opposite casing, and the bottom guide plug ; The upper end of the tube with holes in the back cover is connected to the sealing intubation tube, and the tube body is connected to the constant pressure valve and the sealing cylinder in each section. When working, the packer is used to separate the horizontal well section first, and then the sealing intubation and bottom-sealed perforated pipe are lowered, and the sealing cylinder is combined in the separation string to form a secondary sealing section, and the sealing intubation is dragged to carry out selective mining of the horizontal section And seek production and find water in sections. The invention can be used in multiple stages, and the number of stages is not limited, and can realize selective mining under the condition of slight change and damage of the casing, or mining from top to bottom section by section and seeking production and water in sections, and can avoid full well water Flood to ensure a good development effect.

Description

technical field [0001] The invention relates to a casing completion multi-stage fracturing horizontal well selective recovery pipe string and a working method thereof, belonging to the field of oil recovery technology. Background technique [0002] Using horizontal wells to develop low-permeability oilfields can greatly improve the development effect and increase the recovery factor. With the advancement of horizontal well drilling technology and stimulation methods, the horizontal section of horizontal well is getting longer and the number of stimulation sections is increasing. Affected by water injection development and fracture development, there are problems of uneven stress and different contributions in various layers of horizontal wells. Water flooding in part of the horizontal section will affect the whole well, rapidly increasing the water cut in the well, shortening the water-free oil production period, and accelerating the decline in production. Dynamic on-site ...

AI Technical Summary

Problems solved by technology

However, whether the downhole switch is normal or not can only be known after the test is over. If the switch fails, the test will fail

In addition, the slight change and scaling of the horizontal well casing will make the self-sealing packer unable to run in, and cannot be dragged and pulled out when oil swells

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