Yiyan Y Chen

US Patent:

7148185, Dec 12, 2006

Filed:

May 9, 2003

Appl. No.:

10/249830

Inventors:

Diankui Fu - Missouri City TX, US
Yiyan Chen - Richmond TX, US
Zhijun Xiao - Kuala Lumpur, MY
Mathew Samuel - Al-Khobar, SA
Sylvie Daniel - Jouy en Josas, FR

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

C09K 8/52
C09K 5/58
C09K 8/60

US Classification:

507244, 507240, 507272, 507277

Abstract:

A viscous aqueous high density well treatment fluid composition stable at high temperature containing a surfactant and inorganic salts is described. Methods of preparing the fluid and increasing the stability and viscosity of the fluid are given. The fluid is useful for wellbore cleanout, hydraulic fracturing, gravel packing, completion, acid diversion, lost circulation reduction, well killing, cementing, selective water shutoff, and fracture fluid diversion.

US Patent:

7287590, Oct 30, 2007

Filed:

Sep 18, 2006

Appl. No.:

11/532559

Inventors:

Philip F. Sullivan - Bellaire TX, US
Belgin Baser - Houston TX, US
Carlos Abad - Richmond TX, US
Yiyan Chen - Richmond TX, US
Mehmet Parlar - Sugar Land TX, US
Gregory Kubala - Houston TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 43/25
E21B 43/26

US Classification:

166300, 1663051, 1663082, 507201, 507209, 507265, 507921

Abstract:

Delayed breakers are given that break viscoelastic surfactant fluids inside the pores of formations into which the fluids have been injected. The breakers comprise proteins, proteins that contain breakers, or cells that contain breakers. Proteins become breakers, and proteins and cells release breakers, due to a triggering mechanism that may be, for example, a change in temperature, pH, or salinity.

US Patent:

7291651, Nov 6, 2007

Filed:

Jun 4, 2004

Appl. No.:

10/860855

Inventors:

Yiyan Chen - Richmond TX, US
Jesse Lee - Sugar Land TX, US
Timothy L. Pope - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugarland TX

International Classification:

B01F 3/04
B01F 17/36
C09K 8/60
E21B 21/00
E21B 43/22

US Classification:

516 19, 516 9, 516 10, 516 18, 507203, 507260, 507261, 507266, 1662701

Abstract:

An aqueous viscoelastic surfactant (VES) fluid foamed or energized with carbon dioxide, in which the VES is more compatible with the carbon dioxide, is made by the addition of one or more than one synergistic co-surfactant. The synergist co-surfactant includes quaternary amines and ethoxylated carboxylates having a hydrophobic chain shorter than the hydrophobic chain of the VES. Improved compatibility is evidenced for a given surfactant concentration either by formation and maintenance of a foam under conditions at which the foam could not otherwise have been formed or maintained, or by either higher viscosity of the foamed fluid at a given temperature or longer foam life at a given temperature or a higher temperature at which useful fluid viscosity can be generated or maintained for a useful time. The aqueous carbon dioxide foamed fluids may be used in acidizing, acid fracturing, gravel packing, diversion, and well cleanout.

US Patent:

7320952, Jan 22, 2008

Filed:

Jan 12, 2005

Appl. No.:

11/033651

Inventors:

Yiyan Chen - Richmond TX, US
Jesse C. Lee - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

C09K 8/588

US Classification:

507240, 507241, 507255, 507260, 507261, 507266, 507267, 166282

Abstract:

Composition and method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a co-gelling agent selected from triblock oligomeric compounds having hydrophilic (for example polyether) and hydrophobic (for example alkyl) portions. The co-gelling agent also increases fluid viscosity and very low co-gelling agent concentration is needed. Preferred surfactants are betaines and quaternary amines. The fluids are useful in oilfield treatments, for example fracturing and gravel packing.

US Patent:

7341980, Mar 11, 2008

Filed:

Nov 22, 2004

Appl. No.:

10/994664

Inventors:

Jesse Lee - Sugar Land TX, US
Yiyan Chen - Richmond TX, US
Timothy Pope - Sugar Land TX, US
Eric Hanson - San Diego CA, US
Samuel Cozzens - Rock Springs WY, US
Taner Batmaz - Rock Springs WY, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

C09K 8/584
C09K 8/588
E21B 21/00

US Classification:

507261, 507260, 507266, 507267, 1663082

Abstract:

A method for shortening the shear recovery time of zwitterionic viscoelastic surfactant fluids by adding a rheology enhancer having the structure:R-(EO)(PO)—R′—OHin which R is an alkyl group that is straight chained or branched, saturated or unsaturated, and contains from 3 to about 18 carbon atoms, x is from 0 to about 14, y is from 0 to about 7, R′ is an alkyl group that contains from 0 to about 14 carbon atoms and is straight chained, branched if having more than 3 carbon atoms, saturated, unsaturated if having more than one carbon atom, the total number of carbon atoms in R plus R′ is from 3 to about 21, and the EO and PO groups, if present, may be in any order. The rheology enhancer also increases fluid viscosity and thermal stability. Preferred surfactants are betaines. The fluids are useful in oilfield treatments, for example fracturing and gravel packing.

US Patent:

7345012, Mar 18, 2008

Filed:

Jan 17, 2006

Appl. No.:

11/334158

Inventors:

Yiyan Chen - Richmond TX, US
Jesse C. Lee - Paris, FR

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

C09K 8/94
E21B 43/22

US Classification:

507241, 507260, 507261, 507264, 507266, 507267, 1662701, 1663086, 166309

Abstract:

A method for increasing the foam stability of foams made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of an amphiphilic polymeric foam stabilizer containing at least one portion that is a partially hydrolyzed polyvinyl ester or partially hydrolyzed polyacrylate. The foam stabilizer allows foams to be used at temperatures at which the unfoamed fluids would not have stable viscosity, and allows use of lower viscoelastic surfactant concentrations in the liquid phase. Preferred surfactants are betaines and quaternary amines. The fluids are useful in oilfield treatments, for example fracturing and gravel packing.

US Patent:

7378378, May 27, 2008

Filed:

Apr 13, 2006

Appl. No.:

11/279622

Inventors:

Yiyan Chen - Richmond TX, US
Jesse C. Lee - Paris, FR
Fang Li - Pleasanton CA, US
Manilal Dahanayake - Princeton Junction NJ, US
Robert Tillotson - Toms River NJ, US
Allwyn Colaco - South River NJ, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

C09K 8/584
C09K 8/588
E21B 21/00

US Classification:

507259, 507129, 507135, 507136, 507240, 507241, 507252, 507260, 507261, 507267, 507922, 1663082

Abstract:

A method for increasing the rate of shear rehealing of fluids made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer package containing, for example a polyethylene glycol-polypropylene glycol block copolymer and a polynaphthalene sulfonate. The rheology enhancer package allows viscoelastic surfactant fluids to be used at lower viscoelastic surfactant concentrations in certain applications, for example certain oilfield treatments, for example fracturing and gravel packing. Preferred surfactants are betaines and quaternary amines.

US Patent:

7387986, Jun 17, 2008

Filed:

Oct 13, 2005

Appl. No.:

11/249233

Inventors:

Yiyan Chen - Richmond TX, US
Carlos Abad - Richmond TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

C09K 8/58
C09K 8/68
E21B 21/00

US Classification:

507260, 507219, 507240, 507241, 507244, 507245, 507261, 507266, 507257, 1663081

Abstract:

A method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of an amphiphilic polymeric rheology enhancer containing at least one portion that is a partially hydrolyzed polyvinyl ester or partially hydrolyzed polyacrylate. The rheology enhancer also increases fluid viscosity and very low rheology enhancer concentration is needed. Preferred surfactants are betaines and quaternary amines. The fluids are useful in oilfield treatments, for example fracturing and gravel packing.