Intelligent well completion system and method based on optical fiber monitoring and layered flow control

Abstract

The invention discloses an intelligent well completion system based on optical fiber monitoring and layered flow control. The intelligent well completion system comprises a ground signal processing subsystem, a ground hydraulic subsystem, an underground dynamic monitoring subsystem and a plurality of flow control devices. The underground dynamic monitoring subsystem comprises a sensing optical fiber and a plurality of optical fiber sensor assemblies; the sensing optical fiber is arranged in an oil well casing in a penetrating mode and extends along an oil well; and the optical fiber sensor assemblies are fixedly arranged on the outer wall of an oil pipe and connected with the sensing optical fiber. The ground signal processing subsystem is electrically connected with the ground hydraulic subsystem through a control cable. The flow control devices are connected with the oil pipe and the ground hydraulic subsystem. The invention further provides an intelligent well completion method based on optical fiber monitoring and layered flow control. Underground distributed monitoring is realized, production halt monitoring is not needed, and the measurement cost is reduced. The detection precision is improved, and the monitoring system and the monitoring method which are high in reliability and high in stability are realized.

Description

technical field [0001] The invention belongs to the field of oil well monitoring systems, and in particular relates to an intelligent well completion system and method based on optical fiber monitoring and layered flow control. Background technique [0002] In the process of exploration and development of oil and gas fields, after the oil and gas wells are conventionally completed, various physical means can be used to measure downhole fluids, pressure and temperature of oil and gas reservoirs, and visualization of downhole oil and gas reservoirs from the surface. Collect, screen, analyze and research to obtain the optimal production plan of oil and gas wells, and further use ground control equipment to remotely install intelligent measurement and control equipment (operating valves or sliding sleeve switches, downhole oil-water separators, etc.) installed in downhole oil and gas layers. In the case of moving pipe strings, according to the conditions of oil wells, water inje...

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Problems solved by technology

[0005] (1) The traditional measurement device is a single-point measurement device. With the increase of measurement points, the measurement system will become complicated and increase the measurement cost;

[0006] (2) Since oil and gas wells have a large amount of corrosive liquid, the detection end of the conventional measuring device is in direct contact with the well fluid, so it is difficult to place it downhole for a long time, and real-time online measurement of downhole temperature and pressure in oil and gas fields cannot be realized;

[0007] (3) The traditional measurement device needs to stop production of the oil well to measure, which affects the production efficiency of the oil field, and its measurement data cannot reflect the real parameters in the production process;

[0008] (4) At present, the measurement device needs electrical signals to transmit the measurement data. Due to the interference of the underground electromagnetic environment, the data measurement has errors

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