Chung C Chang

US Patent:

7617908, Nov 17, 2009

Filed:

Nov 13, 2006

Appl. No.:

11/559252

Inventors:

Chung Chang - Lexington MA, US
Richard Timothy Coates - Middlebury CT, US
Jean G. Saint Germain - Cambridge MA, US

Assignee:

Schlumberger Technology Corporation - Ridgefield CT

International Classification:

G01V 1/02

US Classification:

181121, 181106, 181108, 181113, 367 25, 166249, 1662542, 166209, 166210, 166211

Abstract:

Elastodynamic waves are generated by a tool having a hammer rotatably connected with a housing by a first hinge and an actuator arm rotatably connected with the hammer by a second hinge. An axial force applied to the actuator arm by a drive shaft and spring is translated and amplified to a radial impact force by rotation of the hammer around the first hinge. The tool may also include a stabilizer arm connected to the actuator arm by a third hinge, and connected to the housing by a fourth hinge. The housing may be an acoustic wireline tool cylinder having an opening that permits the hammer mass to extend outside the housing when rotated in a first direction. The housing may also include a second opening that permits the hammer mass to extend outside the housing when rotated in a second direction, and a third opening that permits the hammer mass to extend outside the housing when rotated between the first and second openings.

US Patent:

8009510, Aug 30, 2011

Filed:

Oct 23, 2008

Appl. No.:

12/256860

Inventors:

Chung Chang - Lexington MA, US

Assignee:

Schlumberger Technology Corporation - Cambridge MA

International Classification:

G01V 1/42
E21B 47/00

US Classification:

367 57, 367 25, 367 27, 175 40

Abstract:

Methods and related systems are described making seismic measurements. Seismic energy is transmitted into the earth using a surface seismic source. The seismic energy is received with one or more downhole receivers located in a borehole. In response to the received seismic energy from the surface seismic source, seismic energy is transmitted into the earth using a downhole seismic source. The seismic energy from the downhole seismic source is then received with one or more surface receivers located on the surface of the earth. A delay interval is measured downhole between the first arrival of the seismic energy from the surface seismic source and the transmission from the downhole seismic source. A surface interval is measured between the transmitting of seismic energy from the surface seismic source and first arrival of the seismic energy from the downhole seismic source using the one or more surface receivers. Travel time can be calculated by subtracting the delay interval from the surface interval.

US Patent:

8141635, Mar 27, 2012

Filed:

Oct 9, 2008

Appl. No.:

12/248176

Inventors:

Chung Chang - Lexington MA, US
Henri-Pierre Valero - Belmont MA, US
Jean G. Saint Germain - Cambridge MA, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 47/00
E21B 47/022

US Classification:

1662552, 33302, 3336612, 73178 R, 1662541, 702 9, 702 6

Abstract:

Methods and related systems are described for use for determining orientation of a measurement tool in a cased borehole. The measurement tool is deployed in a cased section of a borehole. The tool includes a volume containing a reference fluid having a first density, and a marker within the fluid having a different density. The position of the marker within volume containing the reference fluid is senses, and orientation information of the measurement tool is determined based at least in part on combining information relating to the position of the marker with prior recorded data representing orientation measurements made while the section of the borehole was not yet cased.