Branch well double-pipe completion pipe string system capable of selectively reentrying and construction and oil production method

Abstract

The invention relates to a branch well double-pipe completion pipe string system capable of selectively reentrying and a construction and oil production method. The system comprises an electric submersible pump pipe string, a production packer assembly, a selective reentry tool and a double-pipe sealing tool assembly, wherein the lower end of the electric submersible pump pipe string is connected with the upper end of the production packer assembly; the selective reentry tool is of an inverted Y-shaped pipeline structure, the upper part of the inverted Y-shaped pipeline is a main oil pipe, and the lower part of the inverted Y-shaped pipeline is a main oil pipe and an auxiliary oil pipe; a main borehole flow channel is formed in the main oil pipe, and a branch borehole flow channel is formed in the auxiliary oil pipe; the upper end of the main oil pipe is connected with the lower end of the production packer assembly; the double-pipe sealing tool assembly comprises a main borehole sealing tool and a branch borehole sealing tool; and the main borehole sealing tool communicates with the lower end of the main oil pipe, and the branch borehole sealing tool communicates with the lower end of the auxiliary oil pipe. According to the branch well double-pipe completion pipe string system capable of selectively reentrying and the construction and oil production method, the sealing integrity of a sidetracking window is guaranteed, and meanwhile, the mining mode of separate mining, combined mining or alternate mining of a main borehole and a branch borehole can be realized.

Description

technical field [0001] The invention relates to the technical field of oil production engineering, in particular to a selective reentrant dual-pipe completion string system for branch wells, construction and oil production methods. Background technique [0002] Branch well is a technology that uses one main wellbore to drill multiple branch wells in the reservoir section. The use of branch well technology can effectively improve the connectivity between oil and gas wells and reservoirs, expand the drainage area, and improve oil flow dynamics Profile, branch well is an effective means to increase single well productivity. However, limited by the technical conditions of well completion technology and completion tools, it is difficult for existing branch wells to achieve separate production or rotation production of branch wells and main well holes, resulting in some multi-branch wells becoming single-branch production, offsetting the Many advantages of multilateral wells do n...

AI Technical Summary

Problems solved by technology

However, limited by the technical conditions of well completion technology and completion tools, it is difficult for existing branch wells to achieve separate production or rotation production of branch wells and main well holes, resulting in some multi-branch wells becoming single-branch production, offsetting the Many advantages of branch wells do not meet the requirements of multi-branch complex structure well development

[0003]In the current branch well development, the cement sheath is used to seal the sidetracking window of the branch well. The sealing performance is poor, and it is easy to cause formation water, mud and sand to enter production pipeline

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