公开(公告)号：EP2310628B1

公开(公告)日：2014-08-27

申请号：EP09770723.6

申请日：2009-06-10

申请人： Schlumberger Technology B.V. ,  PRAD Research And Development Limited ,  Services Pétroliers Schlumberger ,  Schlumberger Holdings Limited

发明人： ZHANG, Hong ,  DEPAVIA, Luis, E.

IPC分类号： G01V3/28 ,  E21B47/09

CPC分类号： E21B47/0905 ,  G01V3/28

摘要： A tool for detecting a structure in a well includes a receiver coil having a first winding and a second winding, a first circuit to apply an input signal to the second winding, and a detection circuit to detect a response of the first winding to the input signal applied to the second winding. The response of the first winding indicates presence of the structure in the well if the receiver coil is positioned proximate the structure. The depths (or locations) of these structures are used to avoid placing receivers near these structures for EM induction surveys, such as cross-well, surface-to-wellbore, or single-wellbore induction loggings with receivers in metallic casing.

公开(公告)号：EP2368142A1

公开(公告)日：2011-09-28

申请号：EP09768456.7

申请日：2009-11-18

申请人： Schlumberger Technology B.V. ,  PRAD Research and Development Limited ,  Services Pétroliers Schlumberger ,  Schlumberger Holdings Limited

发明人： DEPAVIA, Luis, E. ,  ZHANG, Hong

IPC分类号： G01V3/28

CPC分类号： G01V3/28

摘要： Methods and related systems are described for making electromagnetic measurements of a subterranean rock formation (100; 700) through a conductive casing (176; 704) of a borehole. A number of transmitters/receivers (122; 126;...; 708; 710;...) are deployed into single well having a conductive casing (176; 704). A magnetic field is induced through the conductive casing (176; 704) and into a surrounding subterranean rock formation (100; 700), and the magnetic field is detected by the receivers. The receivers have main windings, feedback winding and bucking windings. One of the receiver coils in the tool string is excited at a time, and induced voltages at all of the other receiver coils, either in straight mode, or in feedback mode, are measured.

公开(公告)号：EP2310628A2

公开(公告)日：2011-04-20

申请号：EP09770723.6

申请日：2009-06-10

申请人： Schlumberger Technology B.V. ,  PRAD Research And Development Limited ,  Services Pétroliers Schlumberger ,  Schlumberger Holdings Limited

发明人： ZHANG, Hong ,  DEPAVIA, Luis, E.

IPC分类号： E21B47/09

CPC分类号： E21B47/0905 ,  G01V3/28

摘要： A tool for detecting a structure in a well includes a receiver coil having a first winding and a second winding, a first circuit to apply an input signal to the second winding, and a detection circuit to detect a response of the first winding to the input signal applied to the second winding. The response of the first winding indicates presence of the structure in the well if the receiver coil is positioned proximate the structure. The depths (or locations) of these structures are used to avoid placing receivers near these structures for EM induction surveys, such as cross-well, surface-to-wellbore, or single-wellbore induction loggings with receivers in metallic casing.