Real-time monitoring device for underwater pig operation based on optical fiber detection

Abstract

The invention provides a real-time monitoring device for underwater production facility pipeline pig operation of offshore oil and gas fields, which comprises optical fiber grating arranged on an oiland gas transportation pipeline, and optical fiber grating arranged on central manifold at the bottom of the sea. The size of the pig is matched with the inside diameter of the pipeline, and the pipeline wall vibrates when the pig is pushed forward by oil and gas pressure. The optical fiber grating detects the vibration signal and transmits the signal to a detection device fixed on the manifold inreal time. After signal collection and processing, the vibration signal is transmitted to an underwater control module of an oil production tree. The underwater control module is connected to a sea platform by a submarine cable; the detection device can install the optical fiber grating in the whole pipeline section of the underwater production facility and monitor the operating status information of the pig in the pigging operation section in real time. The operators on the sea surface can monitor the operating status information of the pig in pigging operation in real time through a man-machine interface.

Description

technical field [0001] The invention belongs to oil exploitation equipment, and relates to a real-time monitoring device used for pipeline pigging operations of underwater production facilities in offshore oil and gas fields. Background technique [0002] The traditional pigging operation is to use the pressure of the oil and gas in the oil and gas transmission pipeline to push the pig to move forward. Generally, it is impossible to detect the speed and position of the pig in real time. When the pig is blocked, the position of the pig can only be comprehensively evaluated based on the upstream and downstream pressure, the speed of the pig, and the operating time, and it is impossible to accurately determine whether it has passed a specific key section, and it is impossible to monitor the pig The problem of the real-time location and operation status of the controller. Contents of the invention [0003] The purpose of the present invention is to provide a real-time monitor...

AI Technical Summary

Problems solved by technology

[0002] The traditional pigging operation is to use the pressure of the oil and gas in the oil and gas transmission pipeline to push the pig to move forward. Generally, it is impossible to detect the speed and position of the pig in real time.

When the pig is blocked, the position of the pig can only be comprehensively evaluated based on the upstream and downstream pressure, the speed of the pig, and the operating time, and it is impossible to accurately determine whether it has passed a specific key section, and it is impossible to monitor the pig real-time location and operating status of the

Images