Schlumberger Technology Corporation

Richard D Joyce

Jahir A Pabon

Edward Harrigan

Jacques A Jundt

Ralph Michael D'Angelo

Cengiz Esmersoy

Douglas W Grant

Pierre Henri Campanac

Elizabeth B Dussan V

Chaur-Jian Hsu

Lennox Reid

Abderrhamane Ounadjela

Jeffrey B Aron

H Charles Straub

Darryl Grigor

An apparatus, method and system are provided for characterizing fluid trapped in a subterranean formation using a downhole tool that includes an elongated body and a probe body. The probe body is moveable from and back into the elongated body. The probe body defines a flow line and supports a pressure sensor for measuring fluid pressure in the flow line, a piston and an electrical motor actuator that is adapted to move the piston in order to vary volume of the flow line. The integral electrical motor actuator, piston, pressure sensor and flow line of the probe body can provide for measurement of formation pressure and/or formation mobility.

Apparatus, method and system for measuring formation pressure and mobility

In one aspect, the invention involves an acoustic logging tool for performing acoustic investigations of subsurface geological formations. In one embodiment, the tool comprises a generally longitudinally extending tool body adapted for positioning in a borehole. At least one transmitter is mounted on the tool body to emit acoustic energy. At least one receiver is also mounted on the tool body at a location axially displaced from the at least one transmitter. The receiver is adapted to receive acoustic energy. An attenuator is also positioned along the body and includes at least one cavity having a plurality of particles disposed therein. The attenuator as disclosed herein may be applied to other logging tools for protecting tool components and enhancing measurement quality. Methods for attenuating acoustic energy transmitted through the body of an acoustic logging tool or other logging tools are also disclosed.

Structures and methods for damping tool waves particularly for acoustic logging tools

Growing community of inventors

Epping, NH, United States of America

Richard D Joyce