Branch well double-pipe completion pipe string system and construction method and oil extraction method thereof

Abstract

The invention relates to a branch well double-pipe completion pipe string system and a construction method and an oil extraction method thereof. The system comprises an electric submersible pump pipe string, a production packer assembly, a double-pipe packer and a double-pipe sealing tool assembly which are sequentially arranged from top to bottom, wherein the electric submersible pump pipe string, the production packer assembly and the double-pipe packer communicate through a branch well hole production pipe string; the double-pipe packer communicates with the double-pipe sealing tool assembly through a main well hole production pipe string and the branch well hole production pipe string; a sliding sleeve and a locating connector are sequentially arranged on the portion, located between the production packer assembly and the double-pipe packer, of the branch well hole production pipe string from top to bottom; the sliding sleeve is used for communicating with or closing a main well hole production runner; and the locating connector is used for communicating with or closing a branch well hole production runner. A mechanical packing sealing manner is adopted, the sealing integrity of a sidetracking window is guaranteed, and meanwhile the mining manners of separate mining, combined mining and alternate mining of a main well hole and a branch well hole can be achieved.

Description

technical field [0001] The invention belongs to the technical field of oil production engineering, and relates to a branch well double-pipe well completion string system, a construction method of the system and an oil recovery method using the system. 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 is an effective means to increase single well productivity. At present, due to the limitation 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 branch wells. Many advantages of the well do not m...

AI Technical Summary

Problems solved by technology

At present, due to the limitations of 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 wells, do not meet the requirements of multi-lateral complex structure well development

[0003]In the current branch well production, the sidetracking window of the branch well is sealed with a cement sheath, which cannot achieve mechanical sealing, and the sealing performance is poor, which is likely to cause formation water , mud and sand enter the production tubing

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