Schlumberger Technology Corporation

Robert Lanza

James Minto

Shi-Jiang Lu

Leo M Dekkers

Herve Denaclara

Ryosei Aoki

Shantonu Ray

Bradley Bryans

Kathryn L Mccabe

Systems and methods for deploying and using a controlled-frequency downhole seismic source are provided. A downhole seismic source may be placed into a borehole in a geological formation and coupled rigidly to the geological formation via an edge of the borehole. A controlled-frequency seismic signal may be generated sufficient to enable a seismic measurement of the geological formation.

Controlled-frequency downhole seismic source

A seismic generation system may include an electrical source, a conductor coupled to the electrical source and to be positioned in a wellbore in a subterranean formation with a casing therein, and a seismic generation source assembly to be positioned in the wellbore and coupled to the conductor. The seismic generation source assembly may include a source element having a sealed housing, an armature within the sealed housing, source electromagnets coupled to the armature, and electromagnetic clamps coupled to the armature, each electromagnetic clamp having opposite magnetic poles. The sealed housing may include respective ferromagnetic portions adjacent the opposite magnetic poles of each electromagnetic clamp, and non-ferromagnetic portions between the opposite magnetic poles of each electromagnetic clamp.

Seismic device with sealed housing and related methods

Growing community of inventors

Los Gatos, CA, United States of America

Robert Lanza