公开(公告)号：US09605537B2

公开(公告)日：2017-03-28

申请号：US14370198

申请日：2012-01-06

Applicant: John Hull ,  Philip Cheuk ,  Seyed Ehsan Jalilian

Inventor： John Hull ,  Philip Cheuk ,  Seyed Ehsan Jalilian

IPC: E21B47/18 ,  E21B47/04 ,  E21B47/14

CPC classification number: E21B47/18 ,  E21B47/04 ,  E21B47/14

Abstract: The present disclosure is directed at a method and system for determining relative depth of an acoustic event within a wellbore. The method includes obtaining two acoustic signals at two different and known depths in the wellbore, in which each of the acoustic signals includes the acoustic event; dividing each of the acoustic signals into windows; determining cross-correlations of pairs of the windows, in which each of the pairs includes one window from one of the acoustic signals and another window from the other of the acoustic signals that at least partially overlap each other in time; and determining the relative depth of the acoustic event relative to the two known depths from the cross-correlations. The acoustic event may represent, for example, fluid flowing from formation into the wellbore (or vice-versa) or fluid flowing across any casing or tubing located within the wellbore.

公开(公告)号：US20150034306A1

公开(公告)日：2015-02-05

申请号：US14370198

申请日：2012-01-06

Applicant: John Hull ,  Philip Cheuk ,  Seyed Ehsan Jalilian

Inventor： John Hull ,  Philip Cheuk ,  Seyed Ehsan Jalilian

IPC: E21B47/18 ,  E21B47/04

CPC classification number: E21B47/18 ,  E21B47/04 ,  E21B47/14

Abstract: The present disclosure is directed at a method and system for determining relative depth of an acoustic event within a wellbore. The method includes obtaining two acoustic signals at two different and known depths in the wellbore, in which each of the acoustic signals includes the acoustic event; dividing each of the acoustic signals into windows; determining cross-correlations of pairs of the windows, in which each of the pairs includes one window from one of the acoustic signals and another window from the other of the acoustic signals that at least partially overlap each other in time; and determining the relative depth of the acoustic event relative to the two known depths from the cross-correlations. The acoustic event may represent, for example, fluid flowing from formation into the wellbore (or vice-versa) or fluid flowing across any casing or tubing located within the wellbore.

Abstract translation: 本公开涉及一种用于确定井眼内的声学事件的相对深度的方法和系统。 该方法包括在井眼中的两个不同和已知的深度处获得两个声信号，其中每个声信号包括声学事件; 将每个声信号分成窗口; 确定所述窗口对中的互相关，其中每个所述对包括来自所述声信号中的一个的一个窗口和来自至少部分地在时间上彼此重叠的另一声音信号的另一窗口; 并且从交叉相关性确定相对于两个已知深度的声学事件的相对深度。 声学事件可以表示例如流体从地层流入井筒（或反之亦然）或流过位于井筒内的任何套管或管道的流体。