公开(公告)号：US20190129053A1

公开(公告)日：2019-05-02

申请号：US16093640

申请日：2017-04-13

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Pu Wang ,  Sandip Bose ,  Bikash Kumar Sinha ,  Ting Lei

IPC: G01V1/50

Abstract: Methods are provided for determining properties of an anisotropic formation (including both fast and slow formations) surrounding a borehole. A logging-while-drilling tool is provided that is moveable through the borehole. The logging-while drilling tool has at least one dipole acoustic source spaced from an array of receivers. During movement of the logging-while-drilling tool, the at least one dipole acoustic source is operated to excite a time-varying pressure field in the anisotropic formation surrounding the borehole. The array of receivers is used to measure waveforms arising from the time-varying pressure field in the anisotropic formation surrounding the borehole. The waveforms are processed to determine a parameter value that represents shear directionality of the anisotropic formation surrounding the borehole.

公开(公告)号：US20170115413A1

公开(公告)日：2017-04-27

申请号：US15331946

申请日：2016-10-24

Applicant: Schlumberger Technology Corporation

Inventor： Pu Wang ,  Sandip Bose ,  Bikash K. Sinha

IPC: G01V1/30 ,  G01V1/28

Abstract: A technique includes receiving data representing time domain waveforms acquired by receivers of a drilling string-disposed acoustic measurement tool in response to energy emitted by at least one dipole source of the tool. The technique includes processing the data to determine slowness values associated with a plurality of acoustic modes, including a formation flexural acoustic mode and a tool flexural acoustic mode. The technique includes identifying slowness-frequency pairs from the slowness values and determining a shear slowness based at least in part on the identified slowness-frequency pairs.