Electro-hydraulic compound control underground decoding device and decoding method thereof

Abstract

The invention provides an electro-hydraulic compound control underground decoding device and a decoding method thereof. A first hydraulic control pipeline and a second hydraulic control pipeline are respectively connected with an electro-hydraulic compound control device and are connected with ground control equipment through a signal control cable of an electro-hydraulic compound control decoder; a lower electro-hydraulic compound control system is arranged below the electro-hydraulic compound control device located at the bottommost end of a well. Horizon identification is realized by utilizing a circuit system, so that the action of a two-position three-way electromagnetic valve is realized, pressure liquid is guided, the horizon identification efficiency is improved, the problem of delay of a hydraulic decoding system is solved, and the identification precision is improved; and a hydraulic control sliding sleeve is driven through the two hydraulic control pipelines, and compared with a full electric control mode, the number of motors and electronic components is reduced and the driving torque is increased, so therefore the overall process reliability is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, and more specifically relates 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 production, multi-layer oil recovery and water injection are currently used. With the deepening of development, the number of oil well layers is large, the pressure difference between layers is large, and the contradiction between layers is prominent, resulting in serious edge and bottom water intrusion in some layers. This results in an increase in the water content of the well. Therefore, in order to achieve the purpose of stabilizing oil, controlling water, increasing production and improving efficiency, it is necessary to effectively control the development layer of the oil well, and realize the adjustment of interlayer pressure through the throttlin...

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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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