Rotary opening and closing type layered oil production string

Abstract

The invention discloses a rotary opening and closing type layered oil production string. The rotary opening and closing type layered oil production string comprises a production string, and a thermalrecovery string, wherein the production string comprises a rotating assembly, an oil pipe, an oil pumping assembly and a rotary adjusting mechanism, the thermal recovery string comprises a packer anda rotary sliding sleeve assembly connected below the packer, the packer is used for dividing the interior of a sleeve into an upper-layer space and a lower-layer space below the oil pumping assembly,the rotary sliding sleeve assembly comprises an outer pipe and a lining pipe which is arranged inside the outer pipe in a sleeved mode and can rotate around the axis, the lining pipe is provided witha first position for communicating the upper-layer space and the lower-layer space, and a second position for blocking the upper-layer space and the lower-layer space, and the rotary adjusting mechanism can drive the lining pipe to rotate so as to be switched between the first position and the second position. The rotary opening and closing type layered oil production string can play a role of steam on thickened oil, so that the yield of the thickened oil is stably increased.

Description

technical field [0001] The application relates to the field of downhole layered production of steam injection production wells in heavy oil production in oilfields, in particular to a rotary opening and closing type layered oil production string. 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. 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. Sexuality puts forward higher demands. [0003] Since the production of heavy oil requires continuo...

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Problems solved by technology

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

[0003] 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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