Ching F Wu

US Patent:

40728080, Feb 7, 1978

Filed:

Dec 29, 1976

Appl. No.:

5/755161

Inventors:

Pallavoor R. Lakshmanan - Houston TX
Harold E. Swift - Gibsonia PA
Ching Y. Wu - Pittsburgh PA

Assignee:

Gulf Research & Development Company - Pittsburgh PA

International Classification:

C08F 470
C08F24000

US Classification:

526 76

Abstract:

A process for producing an elastomer comprising selected copolymerized C. sub. 5 -hydrocarbons from a hydrocarbon mixture containing C. sub. 5 -monoolefinic hydrocarbons, C. sub. 5 -diolefinic hydrocarbons (cyclic and acyclic) C. sub. 5 -paraffins, C. sub. 6 -aliphatics and benzene which comprises separating the C. sub. 5 -hydrocarbons from the mixture and copolymerizing a selected portion of the resulting C. sub. 5 -hydrocarbon mixture in the presence of a catalyst system to form an elastomer. The elastomers produced are suitable for use in adhesive compositions in general but particularly useful as a component in pressure sensitive adhesive compositions.

US Patent:

40961036, Jun 20, 1978

Filed:

Dec 29, 1976

Appl. No.:

5/755160

Inventors:

Pallavoor R. Lakshmanan - Houston TX
Harold E. Swift - Gibsonia PA
Ching Yong Wu - Pittsburgh PA

Assignee:

Gulf Research & Development Company - Pittsburgh PA

International Classification:

C08K 501
C08K 507
C08K 510
C08L 9304

US Classification:

260 27BB

Abstract:

A pressure-sensitive adhesive composition consisting essentially of a natural or synthetic tackifier, an elastomer comprising isoprene and piperylene and a solvent. The elastomer is preferably prepared from certain selected copolymerized C. sub. 5 -hydrocarbons from a hydrocarbon mixture containing C. sub. 5 -monoolefinic hydrocarbons, C. sub. 5 -diolefinic hydrocarbons (cyclic and acyclic), C. sub. 5 -paraffins, C. sub. 6 -aliphatics, and benzene. The elastomers thus formed, when mixed with certain natural or synthetic tackifiers, have the required tack of pressure-sensitive adhesives.

US Patent:

42079454, Jun 17, 1980

Filed:

Jan 8, 1979

Appl. No.:

6/001520

Inventors:

Wilbur L. Hall - Bellaire TX
Charles R. French - Bridgeport TX
Ching H. Wu - Golden CO
Alfred Brown - Houston TX

Assignee:

Texaco Inc. - White Plains NY

International Classification:

E21B 4324

US Classification:

166272

Abstract:

A process for enhanced recovery of petroleum from subterranean formations wherein a vapor mixture of steam and a petroleum fraction containing naturally occurring phenolic and carboxylic compounds is injected via an injection well, and a mixture of steam condensate and petroleum is produced via a production well.

US Patent:

40077853, Feb 15, 1977

Filed:

Mar 1, 1974

Appl. No.:

5/447106

Inventors:

Joseph C. Allen - Bellaire TX
Charles D. Woodward - Houston TX
Alfred Brown - Houston TX
Ching H. Wu - Houston TX

Assignee:

Texaco Inc. - New York NY

International Classification:

E21B 4324

US Classification:

166263

Abstract:

Viscous petroleum may be recovered from viscous petroleum-containing formations including tar sand deposits by contacting the formation with a heated multiple-component solvent for the petroleum. At least one solvent component is normally gaseous material such as methane, ethane, propane or butane and at least one component is normally liquid, such as pentane and higher molecular weight hydrocarbons. The solvent mixture is heated to a temperature in excess of ambient temperature, and preferably from 100. degree. to 500. degree. F. prior to injection into the formation. The multiple solvent is introduced under sufficient pressure that it is substantially all liquid at the injection conditions. Recovery of petroleum and solvent may be from the same well as is used for injection or from a remotely located well. When the pressure in a portion of the formation contacted by the solvents is reduced below the bubble point pressure of the solvent-bitumen solution, the solvents vaporize to provide a solution gas oil recovery mechanism.

US Patent:

39541410, May 4, 1976

Filed:

Feb 3, 1975

Appl. No.:

5/546580

Inventors:

Joseph C. Allen - Bellaire TX
Charles D. Woodward - Houston TX
Alfred Brown - Houston TX
Ching H. Wu - Houston TX

Assignee:

Texaco Inc. - New York NY

International Classification:

E21B 4316

US Classification:

166274

Abstract:

Petroleum may be recovered from viscous petroleum-containing formations including tar sand deposits by injecting into the formation a multiple-component solvent for the petroleum. At least one solvent component is gaseous at the temperature and pressure of the petroleum reservoir such as carbon dioxide, methane, ethane, propane, butane or pentane and at least one component is liquid at the reservoir conditions, such as hexane and higher molecular weight aliphatic or aromatic hydrocarbons. The multiple solvent is preferably introduced under sufficient pressure that it is substantially all in the liquid phase. Recovery of petroleum and solvent may be from the same well as is used for injection or from a remotely located well. When the pressure in a portion of the formation contacted by the solvents is reduced below the vapor pressure of the gaseous solvent, it vaporizes to provide drive energy for oil production. The liquid components dissolve in the petroleum and reduce the petroleum viscosity.

US Patent:

39839397, Oct 5, 1976

Filed:

Oct 31, 1975

Appl. No.:

5/627563

Inventors:

Alfred Brown - Houston TX
Ching H. Wu - Golden CO
Jack H. Park - Houston TX

Assignee:

Texaco Inc. - New York NY

International Classification:

E21B 4316
E21B 4322
E21B 4324

US Classification:

166269

Abstract:

Recovery of viscous petroleum from thick formations is especially difficult because thermal fluids or solvents needed to mobilize the viscous petroleum tend to channel through high permeability streaks in the formation, thereby bypassing large portions of the petroleum saturated formation. By forming or ensuring that there are naturally occurring high permeability strata in the upper portion and in the lower portion of the petroleum formation, and establishing separate communication means between the surface of the earth and the upper and lower high permeability strata, effective downward displacement may be achieved. A heated fluid such as steam is injected into one well in fluid communication with the lower high permeability strata to pass horizontally through the high permeability strata to another well which is also in fluid communication with the lower high permeability strata, sufficient to heat the lower high permeability zone to a temperature substantially above the ambient temperature of the formation. A solvent having a boiling point intermediate between the ambient temperature of the formation and the temperature to which the communication path is heated is injected into the heated communication path. The solvent vaporizes and moves up into the formation immediately thereabove to dissolve into the viscous petroleum.

US Patent:

39512100, Apr 20, 1976

Filed:

Feb 26, 1975

Appl. No.:

5/553417

Inventors:

Ching H. Wu - Houston TX
Alfred Brown - Houston TX
Daniel T. Konopnicki - Houston TX

Assignee:

Texaco Inc. - New York NY

International Classification:

E21B 4304
E21B 4324

US Classification:

166288

Abstract:

This invention relates to a method for treating wells completed in subterranean formations which contain unconsolidated sand particles, so as to form a permeable barrier which will permit the flow of liquids therethrough while restraining the flow of the unconsolidated sand particles into the well bore. The method comprises saturating sand adjacent the well bore to be treated with petroleum having a high asphaltic content and optionally thereafter contacting the asphaltic petroleum with a solvent capable of solubilizing non-asphaltic fractions of the petroleum and precipitating or causing deposition of the asphaltic or bituminous portions of the petroleum. A heated fluid such as steam is thereafter injected into the formation to cause solidification of the asphaltic materials which effectively binds the sand grains together to form a porous mass which will effectively restrain the movement of sand particles in the well bore upon subsequently placing the well on production. Suitable hydrocarbon materials for causing precipitation of the asphaltic or bituminous portions of the petroleum include liquid paraffinic hydrocarbons such as butane, pentane, or hexane, N-methyl-2-pyrrolidone and furfural. Steam or a mixture of steam and non-condensable gas such as nitrogen, or mixture of steam and air are then injected into the formation to dehydrate and otherwise solidify the precipitated asphaltic material.

US Patent:

40046362, Jan 25, 1977

Filed:

May 27, 1975

Appl. No.:

5/580863

Inventors:

Alfred Brown - Houston TX
Ching H. Wu - Houston TX
Daniel T. Konopnicki - Houston TX

Assignee:

Texaco Inc. - New York NY

International Classification:

E21B 4322
E21B 4324

US Classification:

166272

Abstract:

Petroleum may be recovered from viscous petroleum-containing formations including tar sand deposits by a process involving injecting into the formation a multiple-component solvent for the petroleum and a thermal fluid. At least one solvent component is gaseous at the temperature and pressure of the petroleum reservoir such as carbon dioxide, methane, ethane, propane, butane or pentane, and at least one component is liquid at the reservoir conditions, such as hexane and higher molecular weight aliphatic hydrocarbons or aromatic hydrocarbons such as benzene. The multiple solvent injection is continued with no production until the pressure is from 50 to 250% above the vapor pressure of the solvent, at which pressure the solvent mixture is substantially all in the liquid phase. Recovery of petroleum and solvent is from a remotely located well by reducing the pressure in the portion of the formation contacted by the solvents to a value from 5 to 100% above the vapor pressure of the gaseous solvent. A fluid heated to a temperature above the boiling point of the solvent, such as steam, is then injected into the same well as was used for solvent injection.