Underground position selecting hydraulic decoding method and device of intelligent well

Abstract

The invention relates to an underground position selecting hydraulic decoding method and device of an intelligent well. Pn2=n*(n-1) target layers are controlled by using n hydraulic control pipelines, each target layer is provided with a decoder connected with two hydraulic control pipelines, the two hydraulic control pipelines are respectively used for controlling two target layers through the change of pressure-supplying sequences of the decoder; the decoder comprises a normally open type two-position two-way valve and a normally closed type two-position two-way valve which are connected between the two hydraulic pipelines, the normally open type two-position two-way valve is communicated with the hydraulic control pipeline firstly supplying pressure, the normally closed type two-position two-way valve is communicated with the hydraulic control pipeline supplying the pressure later, the oil outlet end of the normally open type two-position two-way valve is connected with a control oil cavity of the normally closed type two-position two-way valve, the control oil cavity of the normally closed type two-position two-way valve is connected with the hydraulic control pipeline supplying the pressure later, and the oil outlet end of the normally closed type two-position two-way valve is communicated with an underground target layer flow control valve. The invention can realize the purpose that a plurality of underground production layers are selected and controlled by using fewer control pipelines.

Description

technical field [0001] The present invention relates to a decoding method and device, in particular to a hydraulic decoding method and device for downhole layer selection of intelligent wells applied in petroleum engineering drilling and completion and oil and gas exploitation. Background technique [0002] The intelligent completion technology realizes the remote control of the downhole flow control valve through hydraulic pressure, and completes the layered production control of the downhole oil and gas layer on the ground, and realizes the arbitrary switching of multiple production modes such as multi-layer combined production and inter-layer optimized single recovery. Using intelligent completion technology, it is necessary to control the downhole production layer. If there is only one production layer, the hydraulic power pipeline can be directly connected to the action chamber of the downhole flow control valve to realize valve regulation; if multiple production layers ...

AI Technical Summary

Problems solved by technology

Using intelligent completion technology, it is necessary to control the downhole production layer. If there is only one production layer, the hydraulic power pipeline can be directly connected to the action chamber of the downhole flow control valve to realize valve regulation; if multiple production layers are involved, usually Under certain conditions, more hydraulic pipelines need to be lowered, and a large number of hydraulic pipelines will inevitably bring trouble to the installation process and make the ground power system occupy more space

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