Mechanical and forcible closing oil production system

Abstract

The invention discloses a mechanical and forcible closing oil production system. The system comprises a shaft, an oil production pipe column which extends into the shaft, a suspending mechanism and anon-off mechanism; a switching-on mechanism is arranged at the tail end of the oil production pipe column; the oil production pipe column has a first length and a second length which extend into the oil production pipe column and are switchable; the second length is larger than the first length; the suspending mechanism is installed in the shaft and seals and divides the shaft into a first space and a second space located below the first space; the on-off mechanism is installed below the suspending mechanism. When the oil production pipe column has the second length, the on-off mechanism is switched off, so that the second space is not communicated with the oil production pipe column; when the oil production pipe column has the first length, the switching-on mechanism switches on the on-off mechanism, so that the second space is communicated with the oil production pipe column. The mechanical and forcible closing oil production system can exert the effect of steam on thick oil, so thatthe yield of the thick oil is stably increased.

Description

technical field [0001] The application relates to the field of downhole layered production of steam injection production wells in the production of heavy oil in oilfields, in particular to a mechanical forced closed oil recovery system. 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 oil field development. [0003] However, as oilfield production enters the middle and late stages, long-term steam injection will cause leakage at the bottom of the production well, the water output at the bottom of the well will increase, and the water content of the crude oil produced will continue to rise, which will affect the cost, technical reliability and Convenience puts forward higher requirements. [0004] Since the production of heavy oil requires continuous heating and heating, the separa...

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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 has a negative impact on the cost, technical reliability and Convenience puts forward higher requirements

[0004] Since the production of heavy oil requires continuous heating and heating, the separate production string in the current technology will completely seal the lower water outlet layer, which will cause the temperature of the oil layer to drop slowly until it cannot be recovered after a period of production, thus achieving Unexpected steam injection effect seriously affected the implementation of the overall development plan of the oilfield

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