Cased hole completion multi-section-fractured horizontal well selective production pipe column and working method thereof

Abstract

The invention discloses a cased hole completion multi-section-fractured horizontal well selective production pipe column and a working method thereof, wherein the pipe column and the method are designed for selective and section-by-section production of a horizontal well. The outer side of a waterproof oil pipe of the pipe column is connected with a multiple-completion packer of a partition sleeve. The inner side of the waterproof oil pipe is connected with a deep well pump, a sealed inserted pipe, pressure-fixed valves corresponding to all partitions of the sleeve, a sealed cylinder and a bottom end guide plug. The upper end of the bottom-sealed pipe with holes is connected with the sealed inserted pipe. A pipe body is connected with the pressure-fixed valves in all the partitions and the sealed cylinder. During work, the horizontal well section is divided through the packer and then goes into the sealed insertion pipe and the bottom-sealed pipe with the holes downwards, the secondary sealing section is formed in the partition pipe column through combination with the sealing cylinder, the sealed insertion pipe is dragged, and horizontal section selective production and segmented production finding and water exploration are conducted. The cased hole completion multi-section-fractured horizontal well selective production pipe column can be used in a multi-stage mode, the number of stages is not limited, selective production under the condition that the sleeve is slightly changed and damaged can be achieved or section-by-section production and segmented water exploration can be achieved, the phenomenon that the whole well is flooded by water can be avoided, and a good development effect is ensured.

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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