井喷关井水击压力计算及可靠性分析

Calculation and Reliability Analysis of the Shut-in Water Hammer Pressure in Case of Blowout

史富全 李相方 杨喜 杨保健 罗曼

SHI Fuquan LI Xiangfang YANG Xi YANG Baojian LUO Man

中海石油(中国)有限公司天津分公司，天津，300452 中国石油大学（北京），北京　102249 中海油能源发展股份有限公司工程技术分公司，天津　300452

CNOOC (China) Ltd. Tianjin, Tianjin, 300452 China University of Petroleum (Beijing), Beijing, 102249 CNOOC EnerTech-Drilling & Production Co., Ltd., Tianjin 300452, China

钻井过程中，发生了溢流或井喷，应立即关井。关井过程中，防喷器需经受关井产生的水击压力作用。该文对井喷喷流为天然气、钻井液和气液两相混合物三种情况下的关井水击压力进行分析计算，并以此进行了关井可靠性分析。分析认为，仅在井喷喷流为钻井液且喷流速度较大时，关井方式应选择“软关井”，以降低关井水击压力，其他情况应选择“硬关井”，以减少地层流体侵入。

In case of overflow or blowout during drilling, the well should be shut down immediately. During the shut-in process, the BOP needs to withstand the shut-in water hammer pressure. This paper analyzes and calculates the shut-in water hammer pressure when the blowout jet is natural gas, drilling fluid and gas-liquid two-phase mixture. Based on this, the shut-in reliability analysis is performed. According to the analysis, only when the blowout jet is drilling fluid and the jet velocity is large, "Soft Shut-in" should be selected to reduce the shut-in water hammer pressure.In other cases, "Hard Shut-in" should be selected to reduce formation fluid intrusion.

https://doi.org/10.3969/j.issn.1008-2336.2021.01.078