Mechanically closed oil production string and oil production system

Abstract

The invention discloses a mechanical forcibly-closed oil production string and system. The mechanical forcibly-closed oil production string comprises an inner string and a releasing string. The innerstring comprises a switch component, the releasing string comprises a sliding sleeve assembly, and a seal in a shaft can be separated by a suspension unit into an upper space and a lower space. The sliding sleeve assembly comprises an outer pipe and a blocking sliding sleeve. The pipe wall of the outer pipe is provided with a communicating hole communicating with the lower space, and the blockingsliding sleeve is arranged on the position between the switch component and the outer pipe in a sleeving mode when the switch component is located in the outer pipe. The inner pipe string adjusts thelength in the shaft to enable the switch component to move in the axial direction of the outer pipe. The blocking sliding sleeve is provided with a first position for not blocking the communicating hole and a second position for blocking the communicating hole. The switch component can drive the blocking sliding sleeve to move in the axial direction of the outer pipe to enable the blocking slidingsleeve to be switched between the first position and the second position.

Description

technical field [0001] The invention belongs to the technical field of petroleum downhole tools, and in particular relates to a mechanical forced closed oil production string and an oil production system, which can be used for the underground layered production of steam injection production wells in the production of heavy oil in oil fields. Background technique [0002] Our country is rich in heavy oil resources, accounting for about 20% of the total oil resources, so steam injection thermal recovery is an effective heavy oil recovery method among various technological measures for oilfield development. [0003] However, as oilfield production enters the middle and late stages, long-term steam injection causes leakage at the bottom of the production well, the water output at the bottom of the well increases, and the water content of the produced crude oil continues to rise, which affects the cost, technical reliability and convenience of the oil well layered production proce...

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Problems solved by technology

[0003] However, as oilfield production enters the middle and late stages, long-term steam injection causes leakage at the bottom of the production well, the water output at the bottom of the well increases, and the water content of the produced crude oil continues to rise, which affects the cost, technical reliability and convenience of the oil well layered production process. higher demands

[0004] Due to the need for constant heating and heating during the production of heavy oil, the layered injection-production string in the current technology will completely seal the lower water outlet layer, which will cause the temperature of the oil layer to gradually drop after a period of production until it cannot be produced. , so that the expected steam injection effect cannot be achieved, which seriously affects the implementation of the overall development plan of the oilfield

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