深水浅层气地质灾害声波识别预测技术

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

杨进 张百灵 周波 徐鹏 田瑞瑞

YANG Jin ZHANG Bailing ZHOU Bo XU Peng TIAN Ruirui

中国石油大学北京 石油工程教育部重点实验室，北京　102249 中海油能源发展股份有限公司工程技术深圳分公司，广东深圳　518067

MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China Shenzhen Branch of CNOOC, Shenzhen 518067, China

浅层气是深水钻井作业面临的主要地质灾害，做好深水浅层地质灾害准确预测，能够为合理的钻井设计提供科学依据，进一步降低深水钻井的安全风险，为现场安全作业提供技术保障。基于声波在岩土介质中的传播速度特征，开展了深水浅层地质灾害声波特征模拟实验，揭示了海底土中浅层气的存在对岩土中声波传播速度的影响规律，以及浅层气中的压力变化对声波传播速度的影响关系，利用模拟实验结果建立了浅层气声波识别预测模板。现场应用结果表明，深水浅层地质灾害预测模型具有很好的适应性，预测精度能够满足深水钻井设计和现场施工的要求，具有很好的推广应用价值。

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.

10.13639/j.odpt.2015.01.037