Fatigue multi-point wireless monitoring system of marine riser

Abstract

The invention relates to a fatigue multi-point wireless monitoring system of a marine riser. The system is composed of a parameter monitoring part, an information transmitting part and an information receiving part; the parameter monitoring part is composed of a plurality of sensors, is distributed at a plurality of monitoring points under the sea level along the marine riser and used for collecting the accelerated speed, strain and dip angle of the marine riser and ocean flow speed; and the information receiving part comprises an underwater sound transmitting transducer, a vertical underwater sound channel and an underwater receiving transducer; the information receiving part comprises a preposed analog amplification circuit board and an analog band pass filter with automatic gain control, wherein the preposed analog amplification circuit board comprises a triode amplification and operation amplification circuit, and the analog band pass filter comprises automatic gain control, band pass insulation and a postposed amplification circuit. According to the invention, a plurality of sensor groups are arranged along the marine riser, the multi-point real-time wireless fatigue monitoring performance can be realized, simultaneously the seal level information receiving part also can remotely control the underwater monitoring part, control the collecting time, sampling frequency and the like to reduce the energy consumption of the underwater part.

Description

technical field [0001] The invention relates to riser equipment used in the field of offshore oil and gas exploration, in particular to a multi-point wireless monitoring system for testing the fatigue performance of risers. Background technique [0002] As the link between the subsea wellhead and the offshore operating platform, the riser plays an important role in isolating seawater, guiding drilling tools, circulating drilling fluid, and compensating the heave movement of floating drilling units. In the deep water area, the riser is the only equipment connecting the surface platform and the subsea wellhead, without other attachments, the top tension riser in the deep sea (greater than 1500m) environment, in the oscillation, drift and undulation of ocean currents, waves and the surface platform Under the joint action of various loads, such as loads, alternating stress will be generated, which will induce fatigue of the riser, reduce the service life of the riser, and even b...

AI Technical Summary

Problems solved by technology

The main disadvantages of ADCP are: the detection depth of ADCP depends on the power of the acoustic sensor. When the measurement depth increases, the power and volume of ADCP increase accordingly, and the cost and power consumption increase sharply.

Line layout prolongs riser running time and may cause damage, limiting operating depth

Compared with the stand-alone monitoring system, the structure, installation and interface of the real-time monitoring system are very complicated, and the cost is high, so it is not suitable for the monitoring of deep water risers

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