Geological disaster acoustic wave identification and prediction technology of deepwater shallow gas

The shallow gas is a main geological disaster in the deepwater drilling operation. The accurate prediction of deepwater shallow geological disasters is capable of providing a scientific basis for reasonable drilling design, further reducing the safety risks in the deepwater drilling, and providing technical guarantee for the site safe operation. Based on the characteristics of propagation velocity of acoustic wave in the rock and soil medium, the simulation experiment of acoustic wave characteristics of deepwater shallow geological disasters has been conducted, the law of effect of existence of shallow gas in the subsea soil on the propagation velocity of acoustic wave in the rock and soil, and the effect of pressure changes in the shallow gas on the propagation velocity of acoustic wave have been revealed, and the acoustics wave identification and prediction model of shallow gas has been established by virtue of results of simulation experiment. According to the site application results, the prediction model of deepwater shallow geological disasters has favorable adaptability, its prediction precision can meet the requirements of deepwater drilling design and site construction, and it has favorable promotion and application value.