Chung Hua Chang

US Patent:

20130068049, Mar 21, 2013

Filed:

Sep 17, 2011

Appl. No.:

13/235378

Inventors:

Chung Chang - Houston TX, US

International Classification:

F16H 21/48

US Classification:

74 69

Abstract:

A rotational driveshaft coupler that converts a rotating shaft motion into two orthogonal oscillations and at the opposite side of this coupler, a third oscillator converts the oscillations back to a rotational motion. At least one slip free seal can be constructed from the coupler to its housing to separate the space occupied by the output shaft from the space occupied by the input shaft. Each of the three oscillating motions can be guided by bearings, gears and tracks to reduce frictions and heat generation. Permanent magnet pairs are used to prevent bifurcation and force the output shaft to follow the rotation direction of the input shaft. Unlike in magnetic coupling, the torque transmission here is direct.

US Patent:

20130142009, Jun 6, 2013

Filed:

Dec 1, 2011

Appl. No.:

13/309342

Inventors:

Chung Chang - Houston TX, US
Arthur Cheng - Houston TX, US
Chen Li - Katy TX, US
Steve Zannoni - Houston TX, US

Assignee:

Halliburton Energy Services, Inc. - Houston TX

International Classification:

G03B 42/06

US Classification:

367 7

Abstract:

In various embodiments, apparatus and methods are provided to perform acoustic imaging. An acoustic wave can be acquired at a detector, where the acoustic wave propagates from a target to the detector. The target may be acoustically illuminated to provide the acoustic wave. A signal from the detector in response to acquiring the acoustic wave can be processed in a model such that the processing implements a synthetic acoustic lens to generate an image of the target. Additional apparatus, systems, and methods are disclosed.

US Patent:

20220381138, Dec 1, 2022

Filed:

May 27, 2021

Appl. No.:

17/303380

Inventors:

- Houston TX, US
Randolph S. Coles - New Caney TX, US
Jeffrey James Crawford - Katy TX, US
Chung Chang - Houston TX, US

International Classification:

E21B 47/107
G01V 1/46
E21B 47/14

Abstract:

A method for evaluating a sealing material positioned between a casing of a wellbore and a subsurface formation in which the wellbore is formed includes emitting an acoustic waveform outward from a position within the casing and detecting a return waveform that is generated in response to the acoustic waveform interacting with a region of interest that includes at least a portion of the sealing material. The method includes determining a first time window of the return waveform associated with the region of interest and trimming the return waveform based on the first time window. The method further includes determining a first spectral power density for the first time window of the trimmed return waveform and determining a composition ratio for the region of interest based on the first spectral power density.

US Patent:

20220373706, Nov 24, 2022

Filed:

May 24, 2021

Appl. No.:

17/327792

Inventors:

- Houston TX, US
Ruijia Wang - Singapore, SG
Chung Chang - Houston TX, US
Qingtao Sun - Spring TX, US
Yao Ge - Singapore, SG
Xiang Wu - Singapore, SG
Pablo Vieira Rego - Rio de Janeiro, BR
Marco Aurelio Luzio - Rio de Janeiro, BR
João Vicente Gonçalves Rocha - Petrópolis, BR

International Classification:

G01V 1/50
G01N 33/38
G01V 1/02
E21B 47/005
G06F 30/20

Abstract:

Methods, systems, and program products are disclosed for implementing acoustic logging and determining wellbore material characteristics. In some embodiments, a method may include determining a polar differential signal for each of one or more pairs of azimuthally offset acoustic measurements within a wellbore. A reference azimuth is identified based, at least in part, on comparing the polar differential signals to a modeled bonding differential signal within a target response window. The method further includes determining differences between an acoustic measurement at the reference azimuth and acoustic measurements at one or more other azimuths and determining a wellbore material condition based, at least in part, on the determined differences.

US Patent:

20220276403, Sep 1, 2022

Filed:

May 16, 2022

Appl. No.:

17/745599

Inventors:

- Houston TX, US
Peng Li - Houston TX, US
Chung Chang - Houston TX, US
Richard Coates - Katy TX, US
Rodney Allen Marlow - Spring TX, US
Xiang Wu - Singapore, SG
Yao Ge - Singapore, SG
Jing Jin - Singapore, SG

Assignee:

Halliburton Energy Services, Inc. - Houston TX

International Classification:

G01V 1/50
G01V 1/30
E21B 47/002

Abstract:

A method for generating acoustic images corrected for distortions caused by attenuation of the ultrasonic signal by the mud may comprise disposing a downhole tool into a borehole, transmitting a pressure pulse from at least one transducer into the borehole, recording an echo with the at least one transducer, measuring a travel time, measuring an amplitude, determining a geometry of the borehole, determining a location of the downhole tool in the borehole, calculating an incident angle, mapping a mud attenuation, and correcting an image. A system for generating acoustic images corrected for distortions caused by attenuation of the ultrasonic signal by the mud comprising a downhole tool that may comprise a measuring assembly, wherein the measuring assembly comprises at least one transducer and wherein the at least one transducer is configured to emit a pressure pulse and record an echo. The system may further comprise an information handling system.

US Patent:

20220268959, Aug 25, 2022

Filed:

Aug 30, 2019

Appl. No.:

17/628611

Inventors:

- Houston TX, US
John Philip GRANVILLE - Humble TX, US
Chung CHANG - Houston TX, US

Assignee:

HALLIBURTON ENERGY SERVICES, INC. - Houston TX

International Classification:

G01V 1/50
G01V 1/52
G01V 1/46
E21B 47/005
E21B 49/00

Abstract:

Apparatus, methods, and systems for determining acoustic velocity behind casing or tubing in a subterranean wellbore. A method may include obtaining a plurality of waveform data sets corresponding to a plurality of propagation path regimes and obtaining a total wavefield across the receiver array. The method may also include determining a Green's function representing each of the plurality of propagation path regimes and determining a noise wavefield by convolving the Green's functions and a known transmitted pressure signal corresponding to the plurality of waveform data sets. The method may also include generating a reduced-noise wavefield by subtracting the noise wavefield from the total wavefield and estimating the acoustic velocity of a formation behind the casing or tubing from the reduce-noise wavefield.

US Patent:

20230094543, Mar 30, 2023

Filed:

Sep 14, 2021

Appl. No.:

17/474662

Inventors:

- Houston TX, US
Jing JIN - Singapore, SG
Ruijia WANG - Singapore, SG
Chung CHANG - Houston TX, US

International Classification:

G01V 1/00
G01V 1/42
G01V 1/46
B06B 1/06

Abstract:

An acoustic transducer includes a substrate element having a first side, and a second side opposite the first side. The acoustic transducer also includes first and second piezoelectric elements coupled to the first side, and third and fourth piezoelectric elements coupled to the second side. The first piezoelectric element has a first polarity, and the second piezoelectric element has a second polarity different than the first polarity. The third piezoelectric element has a third polarity, and the fourth piezoelectric element has a fourth polarity different than the third polarity.

US Patent:

20210286099, Sep 16, 2021

Filed:

Oct 25, 2016

Appl. No.:

16/338732

Inventors:

- Houston TX, US
Chung CHANG - Houston TX, US

Assignee:

HALLIBURTON ENERGY SERVICES, INC. - Houston TX

International Classification:

G01V 1/50
G06F 30/20
E21B 49/00

Abstract:

An apparatus, method, and system for determining body wave slowness from guided borehole waves. The method includes selecting a target axial resolution based on the size of a receiver array, obtaining a plurality of waveform data sets corresponding to a target formation zone and each acquired at a different shot position, computing a slowness-frequency 2D dispersion semblance map for each waveform data set, stacking the slowness-frequency 2D dispersion semblance maps to generate a stacked 2D semblance map, and determining a body wave slowness from the extracted dispersion curve. The method may also include generating a self-adaptive weighting function based on a dispersion model and the extracted dispersion curve, fitting the weighted dispersion curve and the dispersion model to determine a body wave slowness that minimizes the misfit between the weighted dispersion curve and the dispersion model. The method can be applied to both frequency-domain and time-domain processing.