David H Welsh

US Patent:

20180258756, Sep 13, 2018

Filed:

Oct 8, 2015

Appl. No.:

15/759436

Inventors:

Nam Nguyen - Singapore, SG
Yi Yang Ang - Singapore, SG
Yinghui Lu - The Woodlands TX, US
Avinash Vinayak Taware - San Jose CA, US
Paris Smaragdis - Urbana IL, US
David Alan Welsh - League City TX, US

International Classification:

E21B 47/10
G01S 7/52
G01V 1/46
G01V 1/48
G06T 3/40

Abstract:

Various apparatus or methods are arranged to operate a tool in a wellbore, where the tool has a number of acoustic sensors. Scanning images obtained by the tool sensors along the borehole can be combined to increase the contrast of leak location with respect to background noise. A sequence of beamformed images, generated from signals captured by the tool as it moves over a range of depths of the wellbore, can be acquired. Each beamformed image may overlap at least one other beamformed image of the sequence. The beamformed images can be processed and the processed beamformed images can be combined, forming a stitched image. Additional apparatus, systems, and methods operable in providing stitched images can operate in a variety of applications.

US Patent:

20170350235, Dec 7, 2017

Filed:

Mar 30, 2015

Appl. No.:

15/534379

Inventors:

- Houston TX, US
David Alan WELSH - League City TX, US
Federico LUCAS - Houston TX, US

International Classification:

E21B 47/10
G01V 1/48

Abstract:

In some embodiments, an apparatus and a system, as well as a method and article, may operate to substantially simultaneously measure acoustic radiation from a source in a geological formation, at each of at least two sensors in an array, over a selected time period to provide acoustic pressure measurements. Further activity may comprise locating the source at a location in the geological formation with respect to the sensors by determining acoustic intensity associated with the source, based on the acoustic pressure measurements, independent of medium sound velocity in one or more media disposed between the sensors and the source. Additional apparatus, systems, and methods are disclosed.

US Patent:

20170321540, Nov 9, 2017

Filed:

Jan 11, 2016

Appl. No.:

15/318322

Inventors:

Yinghui Lu - The Woodlands TX, US
Avinash Vinayak Taware - The Woodlands TX, US
Paris Smaragdis - Urbana IL, US
Nam Nguyen - Singapore, SG
David Alan Welsh - League City TX, US
Clifford Lloyd Macklin - Katy TX, US
Daniel Viassolo - Katy TX, US
- Houston TX, US

Assignee:

DAIDO STEEL CO., LTD. - Nagoya-shi, Aichi

International Classification:

E21B 47/10
G01V 1/40
G01H 17/00

Abstract:

Disclosed are tools, systems, and methods for detecting one or more underground acoustic sources and localizing them in depth and radial distance from a wellbore, for example, for the purpose of finding underground fluid flows, such as may result from leaks in the well barriers. In various embodiments, acoustic-source detection and localization are accomplished with an array of at least three acoustic sensors disposed in the wellbore, in conjunction with array signal processing.

US Patent:

20170293044, Oct 12, 2017

Filed:

Nov 17, 2015

Appl. No.:

15/511868

Inventors:

- Houston TX, US
Yinghui Lu - The Woodlands TX, US
John P. Granville - Humble TX, US
Yibing Zheng - Houston TX, US
David Alan Welsh - League City TX, US

International Classification:

G01V 1/50
E21B 47/10
E21B 47/00

Abstract:

In accordance with embodiments of the present disclosure, systems and methods for taking acoustic/ultrasonic wave measurements of a wellbore using a downhole tool equipped with microelectromechanical (MEM) transducers are provided. The MEM transducers may include a plurality of MEM transmitters (e.g., MEM speakers) and a plurality of separate MEM receivers (e.g., MEM microphones). These MEM transducers may be disposed in arrays proximate an outer surface of the downhole tool to collect acoustic/ultrasonic wave measurements of the full circumference of a wellbore. Due to their small size, large numbers of MEM transducers may be distributed radially around the downhole tool. Such an arrangement of sensors may enable the downhole tool to perform measurements of the entire wellbore without the downhole tool needing to be rotated, leading to an increased signal-to-noise ratio of the measurements.