An electro-hydraulic composite control downhole decoding device and its decoding method

Abstract

The invention provides an electro-hydraulic composite control downhole decoding device and a decoding method thereof. The first hydraulic control pipeline and the second hydraulic control pipeline are respectively connected with the electro-hydraulic composite control device, and the signal control cable of the electro-hydraulic composite control decoder is connected with the electro-hydraulic composite control device. The ground control equipment is connected, and the lower electro-hydraulic composite control system is arranged below the electro-hydraulic composite control device located at the bottom of the well. The circuit system is used to realize horizon recognition, so as to realize the action of the two-position three-way solenoid valve, guide the pressure fluid, improve the horizon recognition efficiency, solve the delay problem of the hydraulic decoding system, and improve the recognition accuracy; Compared with the full electronic control mode, the driving of the sliding sleeve reduces the existence of motors and electronic components, improves the driving torque, and thus improves the overall process reliability.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to an electro-hydraulic composite control downhole decoding device and a decoding method thereof. Background technique [0002] In order to carry out efficient oilfield development and exploitation, multi-layer oil production and water injection methods are currently used. With the deepening of development, the number of oil wells is large, the pressure difference between layers is large, and the contradiction between layers is prominent, resulting in serious water inrush at the edge and bottom of some layers. As a result, the water cut of the whole well increases. Therefore, in order to achieve the purpose of stabilizing oil and water, increasing production and improving efficiency, it is necessary to effectively control the development horizon of the oil well, and realize the adjustment of the interlayer pressure through the throttling device, so as...

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Problems solved by technology

[0003] At home and abroad, a lot of related research has been done on the layering control of oil-water wells. In the early stage, the mechanical sliding sleeve switch method was used to switch the mechanical sliding sleeve through steel wire operation to realize the opening and closing of downhole layers. The problem with this method is that for highly deviated wells, For horizontal wells, the steel wire operation cannot be adjusted, and the construction process is complicated through the steel wire cable control method, which affects the normal production of oil and water wells and the control efficiency is low

This method can switch and control the downhole layers without affecting normal production. Compared with wire and cable operations, the control efficiency has been greatly improved. When there are many layers of oil and water wells, the number of hydraulic control pipelines is large. , causing the overall process availability to be limited. Although a hydraulic decoding method and device for downhole layer selection in intelligent wells (patent number: 2010105826522) appeared later, it uses hydraulic decoding, and the decoding efficiency is low. At the same time, there is a delay in the transmission of the hydraulic control fluid. problem, resulting in high decoding failure rate and affecting downhole control accuracy; with the gradual maturity of electronic technology, an electronically controlled intelligent well completion measurement and adjustment system and method (patent number: 2010105826522) gradually emerged. This system uses a cable to realize downhole electronic control. The adjustment of the sliding sleeve is easy to operate and the adjustment efficiency is high, but the problem is that the reliability of electronic components is limited in the high temperature and high pressure environment underground, resulting in poor reliability of the overall process

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