Li Chen

US Patent:

20120231537, Sep 13, 2012

Filed:

Mar 27, 2012

Appl. No.:

13/431359

Inventors:

Nancy Smyth Templeton - Houston TX, US
Li Chen - Plano TX, US

Assignee:

Gradalis, Inc. - Carrollton TX

International Classification:

C12N 15/63

US Classification:

4353201

Abstract:

The present disclosure generally relates to highly pure plasmid compositions having low, or undetectable, levels of colanic acid and other contaminants made by a process that comprises purifying plasmid DNA by chromatography, treating the purified plasmid DNA with a polypeptide that digests colanic acid under conditions that digest the colonic acid, and separating the plasmid DNA from the digested colonic acid.

US Patent:

20200378249, Dec 3, 2020

Filed:

Aug 17, 2020

Appl. No.:

16/995436

Inventors:

- Sugar Land TX, US
Vinay K. Mishra - Katy TX, US
German Garcia - Katy TX, US
Li Chen - Katy TX, US
Thomas Pfeiffer - Sugar Land TX, US
Soraya S. Betancourt Pocaterra - Katy TX, US
Jerimiah Forsythe - Cambridge MA, US
Andrew Emil Pomerantz - Lexington MA, US
Youxiang Zuo - Burnaby, CA
Oliver C. Mullins - Houston TX, US

International Classification:

E21B 49/08
G06F 30/17
E21B 49/10

Abstract:

Systems and methods for identifying a likelihood that a reservoir of a geological formation received a secondary charge of hydrocarbons of relatively very different thermal maturity of composition are provided. One method includes positioning a downhole acquisition tool in a wellbore in a geological formation and testing one or more fluid properties of the formation fluid. Data processing circuitry may identify whether a relationship of the one or more fluid properties exceeds a first threshold that indicates likely asphaltene instability. When this is the case, data processing circuitry may be used to model the geological formation using a realization scenario in which multiple charges of hydrocarbons of substantially different thermal maturity or substantially different composition, or both, filled a reservoir of the geological formation over geologic time.

US Patent:

20180216458, Aug 2, 2018

Filed:

Feb 2, 2018

Appl. No.:

15/887049

Inventors:

- Sugar Land TX, US
Hadrien Dumont - Houston TX, US
Christopher Albert Babin - Waveland MS, US
Li Chen - Katy TX, US
Vinay K. Mishra - Katy TX, US

International Classification:

E21B 49/10
E21B 49/06
E21B 47/06
E21B 23/01

Abstract:

Apparatus and methods for performing downhole testing. Example apparatus include a downhole tool string for conveying within a wellbore, the downhole tool string comprising an anchor device, a testing device, and a linear or rotary actuator. The anchor device maintains a portion of the downhole tool string in a predetermined position within the wellbore. The testing device is operable to receive a downhole sample from or test a subterranean formation surrounding the wellbore. The linear actuator is connected between the anchor device and testing device, and moves the testing device relative to the anchor device.

US Patent:

20170342828, Nov 30, 2017

Filed:

May 19, 2017

Appl. No.:

15/599533

Inventors:

- Sugar Land TX, US
Vinay K. Mishra - Katy TX, US
German Garcia - Katy TX, US
Li Chen - Katy TX, US
Thomas Pfeiffer - Sugar Land TX, US
Soraya S. Betancourt Pocaterra - Katy TX, US
Jerimiah Forsythe - Cambridge MA, US
Andrew Emil Pomerantz - Lexington MA, US
Youxiang Zuo - Burnaby, CA
Oliver C. Mullins - Houston TX, US

International Classification:

E21B 49/08
E21B 49/10
G01V 99/00

Abstract:

Systems and methods for identifying a likelihood that a reservoir of a geological formation received a secondary charge of hydrocarbons of relatively very different thermal maturity of composition are provided. One method includes positioning a downhole acquisition tool in a wellbore in a geological formation and testing one or more fluid properties of the formation fluid. Data processing circuitry may identify whether a relationship of the one or more fluid properties exceeds a first threshold that indicates likely asphaltene instability. When this is the case, data processing circuitry may be used to model the geological formation using a realization scenario in which multiple charges of hydrocarbons of substantially different thermal maturity or substantially different composition, or both, filled a reservoir of the geological formation over geologic time.

US Patent:

20170138921, May 18, 2017

Filed:

Jan 30, 2017

Appl. No.:

15/419137

Inventors:

- Sugar Land TX, US
Adriaan Gisolf - Aberdeen, GB
Li Chen - Katy TX, US

International Classification:

G01N 33/28
E21B 49/10

Abstract:

Methods and apparatus for operating a downhole tool within a wellbore adjacent a subterranean formation to pump contaminated fluid from the formation into the downhole tool while measuring first and second fluid properties of the contaminated fluid. The contaminated fluid comprises native fluid from the formation and a contaminant. The downhole tool is in communication with surface equipment located at surface. The downhole tool and/or surface equipment is operated to estimate a formation volume factor of the contaminated fluid based on at least one of the first and second fluid properties of the contaminated fluid. A linear relationship is then estimated between the first fluid property and a function that relates the first fluid property to the second fluid property and the estimated formation volume factor of the contaminated fluid. A fluid property of the contaminant is then estimated based on the estimated linear relationship.

US Patent:

20170022809, Jan 26, 2017

Filed:

Jun 15, 2016

Appl. No.:

15/183090

Inventors:

- Sugar Land TX, US
Hadrien Dumont - Houston TX, US
Vinay K. Mishra - Katy TX, US
Li Chen - Katy TX, US
Abhishek Agarwal - Sugar Land TX, US
Cosan Ayan - Clamart, FR

International Classification:

E21B 49/08
G01N 33/24
E21B 33/12

Abstract:

The present disclosure relates to a formation sampling method that includes disposing a downhole tool comprising a packer and an expandable probe within a wellbore. The method also includes performing pressure transient testing by setting the expandable packer and the probe to engage a wall of the wellbore and measuring a pressure response at the expandable packer and the probe while withdrawing formation fluid into the downhole tool through the expandable packer. The method further includes monitoring a contamination level of the formation fluid during the pressure transient testing, and performing formation sampling with the probe in response to determining that the monitored contamination level meets a predetermined threshold.

US Patent:

20150308261, Oct 29, 2015

Filed:

Apr 28, 2014

Appl. No.:

14/263893

Inventors:

- Sugar Land TX, US
Adriaan Gisolf - Houston TX, US
Kai Hsu - Sugar Land TX, US
Li Chen - Houston TX, US
Beatriz Barbosa - Houston TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 47/06
E21B 47/12
E21B 23/14
E21B 49/08

Abstract:

A downhole tool is operated to pump fluid from a subterranean formation while obtaining fluid property measurements pertaining to the pumped fluid. The downhole tool is in communication with surface equipment located at the wellsite surface. The downhole tool and/or surface equipment is operated to estimate a first linear, exponential, logarithmic, and/or other relationship between compressibility and pressure of the pumped fluid based on the fluid property measurements. The downhole tool and/or surface equipment may also be operated to estimate a second linear, exponential, logarithmic, and/or other relationship between formation volume factor and pressure of the pumped fluid based on the first relationship. The downhole tool and/or surface equipment may also be operated to measure and correct optical density of the pumped fluid based on the first relationship.

US Patent:

20150226059, Aug 13, 2015

Filed:

Feb 11, 2014

Appl. No.:

14/177744

Inventors:

- Sugar Land TX, US
Adriaan Gisolf - Houston TX, US
Li Chen - Houston TX, US

International Classification:

E21B 49/08
G01N 33/28

Abstract:

Methods and apparatus for operating a downhole tool within a wellbore adjacent a subterranean formation to pump contaminated fluid from the formation into the downhole tool while measuring first and second fluid properties of the contaminated fluid. The contaminated fluid comprises native fluid from the formation and a contaminant. The downhole tool is in communication with surface equipment located at surface. The downhole tool and/or surface equipment is operated to estimate a formation volume factor of the contaminated fluid based on at least one of the first and second fluid properties of the contaminated fluid. A linear relationship is then estimated between the first fluid property and a function that relates the first fluid property to the second fluid property and the estimated formation volume factor of the contaminated fluid. A fluid property of the contaminant is then estimated based on the estimated linear relationship.