公开(公告)号：US10920584B2

公开(公告)日：2021-02-16

申请号：US15765476

申请日：2016-09-30

申请人： SCHLUMBERGER TECHNOLOGY CORPORATION

发明人： Oney Erge ,  Ines De Mata Cecilio ,  Richard Dearden ,  Jonathan Dunlop ,  Walter David Aldred ,  Ashley Bernard Johnson ,  Iead Rezek ,  Benjamin Peter Jeffryes

IPC分类号： E21B21/08 ,  E21B47/10 ,  E21B47/117 ,  E21B47/06 ,  G06N7/00

摘要： A method for detecting an influx and/or loss of circulation in a wellbore, comprising measuring a condition in the wellbore using a downhole sensor; determining that a positive displacement pump is shut off or turned on; predicting pit volume and/or gas concentration at a plurality of time points after the positive displacement pump is shut off or turned on using the measured condition in the wellbore prior to the positive displacement pump is shut off or turned on, wherein the measured condition correlates with the pit volume and/or gas concentration; measuring pit volume and/or gas concentration at the plurality of time points; comparing the predicted and the measured pit volumes and/or gas concentrations at the plurality of time points; and producing a warning signal if the difference between the predicted and the measured pit volumes and/or gas concentrations is greater than a pre determined value.