Self-adaptable inflow control device for oil well

Abstract

The invention discloses a self-adaptable inflow control device for an oil well. The self-adaptable inflow control device comprises an outer base tube and an inner base tube which penetrates the interior of the outer base tube; one end of the outer base tube is open; the other end of the outer base tube is in closed connection with the outer wall of the inner base tube; a through hole is formed in the position, close to the other end of the of the outer base tube, on the side wall of the inner base tube; a plurality of annular clamping plates with gaps in circumferential directions are arranged in annular space between the outer base tube and the inner base tube and between the through hole and the open end of the outer base tube in parallel at intervals; the outer side walls of the annular clamping plates are in sealed connection with the inner wall of the outer base tube; the inner side walls of the annular clamping plates are in sealed connection with the outer wall of the inner base tube; water expansion units which can stretch and retract in the circumferential direction are arranged on the two sides of the circumferential direction of each gap. According to the device, the problems of complicated structure, small application range, easiness in coning failure and the like in the prior art can be solved; the device is simple in structure; coning failure is prevented effectively; the application range is relatively wide.

Description

technical field [0001] The invention relates to a device for improving the effect of oil field development, in particular to an adaptive inflow control device for oil wells. Background technique [0002] In long horizontal wells, due to the "heel effect" and / or the influence of reservoir heterogeneity, the production of the well in some locations is much higher than that in others, and the resulting uneven production These locations see water / air prematurely. Once coning occurs, well production is significantly reduced due to restricted flow elsewhere. In order to eliminate this unbalanced phenomenon, commonly used methods include staged perforation, variable density perforation completion, central pipe completion, etc. However, these methods have limited ability to control the inflow profile, and it is difficult to ensure that the production profile is sufficiently uniform. [0003] In the early 1990s, NorskHydro (Norway Hydro) was the first to develop inflow control dev...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an adaptive inflow control device for oil wells, which can overcome the problems of complex structure, small application range, and easy coning failure in the prior art. The device has a simple structure and can effectively prevent coning. failure, wide range of application

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