公开(公告)号：EP1505411A3

公开(公告)日：2007-12-19

申请号：EP04024171.3

申请日：2001-11-13

申请人： Baker Hughes Incorporated

发明人： Tang, Xiao Ming ,  Patterson, Douglas ,  Wang, Tsili ,  Leggett, James V. III ,  Dubinsky, Vladimir

IPC分类号： G01V1/44 ,  G01V1/52 ,  G01V1/28

CPC分类号： G01V1/44

摘要： The logging tool (90) of this invention includes a transmitter (105) conveyed on a drilling collar for exciting a quadrupole signal (106) in a borehole being drilled by a drill bit and a receiver for receiving the signal. The transmitter is operated at a frequency below the cut-off frequency of the quadrupole collar mode. The received signal consists primarily of the formation quadrupole mode which, at low frequencies, has a velocity that approaches the formation shear velocity. The transmitter, in one embodiment, consists of eight equal sectors of a piezoelectric cylinder mounted on the rim of the drilling collar. The value of the cut- off frequency is primarily dependent on the thickness of the drilling collar. Alternatively, the transmitter may be operated to produce both the collar mode and the formation mode and a processor may be used to filter out the collar mode.

公开(公告)号：EP1505411A2

公开(公告)日：2005-02-09

申请号：EP04024171.3

申请日：2001-11-13

申请人： BAKER HUGHES INCORPORATED

发明人： Tang, Xiao Ming ,  Patterson, Douglas ,  Wang, Tsili ,  Leggett, James V. III ,  Dubinsky, Vladimir

IPC分类号： G01V1/44 ,  G01V1/52 ,  G01V1/28

CPC分类号： G01V1/44

摘要： The logging tool (90) of this invention includes a transmitter (105) conveyed on a drilling collar for exciting a quadrupole signal (106) in a borehole being drilled by a drill bit and a receiver for receiving the signal. The transmitter is operated at a frequency below the cut-off frequency of the quadrupole collar mode. The received signal consists primarily of the formation quadrupole mode which, at low frequencies, has a velocity that approaches the formation shear velocity. The transmitter, in one embodiment, consists of eight equal sectors of a piezoelectric cylinder mounted on the rim of the drilling collar. The value of the cut- off frequency is primarily dependent on the thickness of the drilling collar. Alternatively, the transmitter may be operated to produce both the collar mode and the formation mode and a processor may be used to filter out the collar mode.

摘要翻译： 本发明的测井工具（90）包括在钻铤上传送的发射器（105），用于激发由钻头钻的钻孔中的四极杆信号（106）和用于接收信号的接收器。 发射机的工作频率低于四极杆模式的截止频率。 所接收的信号主要由形成四极杆模式组成，其在低频时具有接近地层剪切速度的速度。 在一个实施例中，发射器由安装在钻铤的边缘上的压电圆柱体的八个相等的部分组成。 截止频率的值主要取决于钻铤的厚度。 或者，发射机可以被操作以产生领带模式和形成模式，并且处理器可以用于过滤衣领模式。

公开(公告)号：EP1505411B1

公开(公告)日：2017-04-12

申请号：EP04024171.3

申请日：2001-11-13

申请人： Baker Hughes Incorporated

发明人： Tang, Xiao Ming ,  Patterson, Douglas ,  Wang, Tsili ,  Leggett, James V. III ,  Dubinsky, Vladimir

IPC分类号： G01V1/44 ,  G01V1/52 ,  G01V1/28

CPC分类号： G01V1/44