钻井液与完井液2024，Vol.41Issue(6)：747-754,8.DOI:10.12358/j.issn.1001-5620.2024.06.007
基于DDMP-GWO融合的气侵早期监测方法
A Method of Early Gas Kick Monitoring Based on DDMP-GWO Fusion Algorithm
摘要
Abstract
Measurement of mud gains in mud pits is a conventional method of detecting downhole gas kick and is still in use in present.Using this method,the detection of a gas kick sometimes remarkably lags the occurrence of the gas kick.Another gas kick detecting method is the monitoring-while-drilling method with which gas kick can be timely detected,but the functions of this method are very limited.In this study a new method with which a gas kick can be qualitatively detected in an early time and quantitatively explained is presented,the changes of the flowrates of the fluids in the annular space while a gas kick is encountered are analyzed,a gas kick risk index(KRI)is designed,and the mapping relationship between the KRI and the volume fraction of the kicked gas is derived.Based on the difference between downhole dual measurement points pressure(DDMP),using the grey wolf optimization(GWO)algorithm,a real-time method for calculating the flow velocities of the fluids in the annular space is constructed.Using a simulated gas kick scenario,the stability and effectiveness of the method for early detection of gas kick are analyzed.The study shows that when a gas kick occurs,the flowrates of the fluids in the annular space are increasing,and this can be used as a key characteristic parameter for gas kick detection.The volume fraction of the gas in the annular space has a linear relationship with KRI.Errors made in calculating the flowrate of the fluids in the annular space first decrease and then increase as the distance between the two measurement points increases,and are less affected by the errors made in pressure and temperature measurement.Using this new method,the lag time for detecting a gas kick is 13.8 min,and the inversion error of the gas volume fraction in the annular space is less than 10%.This method is not only able to detect gas kick earlier,it also provides key parameters for well control design such as the gas fraction of the fluids in the annular space at a mud gain in the mud pits of only 0.017 m3,a volume that does not cause the fluid levels in the mud pits to change significantly.关键词
气侵早期监测/井下双测点压差/灰狼优化算法/环空流体流速/气侵模拟Key words
Early gas kick monitoring/Downhole dual measurement points/Grey wolf optimization algorithm/Annulus flow rate/Gas kick simulation分类
能源科技引用本文复制引用
王建龙,于志强,郭云鹏,邓兵,杨洋洋,杨建永,郑锋..基于DDMP-GWO融合的气侵早期监测方法[J].钻井液与完井液,2024,41(6):747-754,8.基金项目
中国石油集团公司科技项目"钻井安全控制软件"(2024ZZ46-05). （2024ZZ46-05）
