墨西哥湾发生的井喷表明深水溢流早期检测与可靠识别存在问题。对深水钻井过程地层气体侵入井筒后与非牛顿流体的钻井液形成的气液两相流型特征的研究，发现钻井液循环与非循环期间沿井筒流型分布差异大。钻井液循环期间发生气侵后在近钻头处多为泡状流，而在非循环期间多为段塞流。深水钻井气侵后当气体运移到隔水管时多呈段塞流型，地面溢出体积通常很小而海底泥线以上隔水管局部含气率较高，因此，在隔水管段测量含气性可以在地面溢流量较小情况发现气侵。鉴于深水钻井隔水管力学完整性，测量含气性的传感器不能在隔水管上打孔安装，研究表明非接触式超声波多普勒传感器是适合的，且沿程布置可以提高测量可靠性。
The blowout of Mexico Gulf indicates that there are problems in the early detection and reliable identification of deepwater drilling overflow. The research about the flow pattern characteristic of gas-liquid two phase flow, when formation gas into borehole mixes with non-newtonian drilling fluid, shows that the flow pattern difference between drilling fluid circulation and non-circulation period. Mostly, It is bubble flow near drill bit during drilling fluid circulation, but during non-circulation period it is mostly slug flow. After kick, it is more possible to form slug flow when gas migrates to the riser, the volume of overflow is frequently is small and the void fraction of the riser above subsea mud line is very large, therefore measuring gas flow in the riser section could detect gas overflow when the volume of overflow is small. In view of the mechanical integrality of riser, it can not be perinitted to punch a hole on the riser in order to fix the gas containing sensor, the research show that it is suitable to use non-contact supersonic doppler sensor , and it could improve measuring reliability that the sensor is arranged along riser.
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