Intelligent sliding sleeve control system and method for downhole multi-stage fracturing based on pressure wave communication

Abstract

The invention discloses an underground multistage fracturing intelligent sliding sleeve control system and method based on pressure wave communication. The underground multistage fracturing intelligent sliding sleeve control system comprises a ground control device (1) and a fracturing sliding sleeve control terminal (9). The ground control device (1) comprises a control valve (6) and a control valve system (7) externally connected with the control valve (6). The opening state of the control valve (6) is automatically controlled through the control valve system (7), so that a specific pressurewave signal conforming to coding is generated in a wellbore. The fracturing sliding sleeve control terminal (9) comprises a monitoring unit, a decoding unit and an execution unit. A pressure fluctuation signal in the wellbore is detected by the pressure wave signal monitoring unit, information contained in a pressure wave is read through the decoding unit, and the execution unit is controlled toact correspondingly. By means of the method, fracturing sliding sleeves of all stages can be independently controlled to respectively open and close the fracturing sliding sleeves in a multi-stage multi-cluster segmented fracturing oil gas well, and construction personnel can carry out precise fracturing on a specific production layer according to needs.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to an intelligent sliding sleeve control system and method for downhole multi-stage fracturing based on pressure wave communication. Background technique [0002] As an important means of increasing production, fracturing technology is widely used in the exploitation of oil and gas. In order to generate more effective fracturing fracture networks and form more effective circulation channels for oil and natural gas, staged fracturing technology has emerged as the times require. In the traditional fracturing technology with the combination of packer and sliding sleeve, a plugging ball is thrown once in the first stage of fracturing, and a sliding sleeve is opened to complete the first stage of hydraulic fracturing, and the next stage of fracturing is opened with a smaller size plugging ball slip sleeve. Due to the limitation of wellbore size, the number of fracturing stages is lim...

AI Technical Summary

Problems solved by technology

As the permeability of production layers becomes lower and lower, the number of stages that need fracturing needs to be continuously increased, so the limitations of traditional fracturing sleeves are also obvious. Traditional fracturing sleeves are cumbersome in structure and complex in operation.

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