Greg L Cedillo

US Patent:

56241828, Apr 29, 1997

Filed:

Feb 27, 1995

Appl. No.:

8/394476

Inventors:

Michael P. Dearing - Cypress TX
Bruce A. Vicknair - Baytown TX
Randall R. Price - Houston TX
Robert A. Baten - Friendsword TX
Greg L. Cedillo - Houston TX
John H. Craig - Houston TX

Assignee:

Stewart & Stevenson Services, Inc. - Houston TX

International Classification:

B01F 1504

US Classification:

366 2

Abstract:

An automatic cementing system and method are disclosed for precisely controlling the density of a slurry during a continuously mixed cement application. The system includes an input water line and a dry cement hopper for supplying water and dry cement, respectively, to a mixing chamber. The mixing chamber includes two chambers, Chamber A and Chamber B, for thoroughly mixing the water and cement together to form a cement slurry. Chamber B includes a level sensor for measuring the change in slurry level. The input line includes a pump for supplying the water to the mixing chamber, and a flow meter for measuring the rate at which the water is supplied. Similarly, the hopper includes a rotary valve for regulating the rate at which the dry cement is supplied to the mixing chamber and a speed sensor for measuring the speed of the rotary valve. A discharge line with a discharge pump and a discharge flow meter receives and discharges cement slurry. A recirculation line is included for density control during initialization.

US Patent:

55034730, Apr 2, 1996

Filed:

Jan 7, 1994

Appl. No.:

8/178659

Inventors:

Michael P. Dearing - Cypress TX
Robert A. Baten - Friendswood TX
Greg L. Cedillo - Houston TX
Bruce A. Vicknair - Baytown TX

Assignee:

Stewart & Stevenson Services, Inc. - Houston TX

International Classification:

B01F 1504

US Classification:

366 2

Abstract:

An automatic cementing system and method are disclosed for precisely controlling the density of a slurry during a continuously mixed cement application. The system includes an input water line and a dry cement hopper for supplying water and dry cement, respectively, to a mixing chamber. The mixing chamber includes two chambers, Chamber A and Chamber B, for thoroughly mixing the water and cement together to form a cement slurry. Chamber B includes a level sensor for measuring the change in slurry level. The input line includes a pump for supplying the water to the mixing chamber, and a flow meter for measuring the rate at which the water is supplied. Similarly, the hopper includes a rotary valve for regulating the rate at which the dry cement is supplied to the mixing chamber and a speed sensor for measuring the speed of the rotary valve. A discharge line with a discharge pump and a discharge flow meter receives and discharges cement slurry. A recirculation line is included for density control during initialization.

US Patent:

54413400, Aug 15, 1995

Filed:

Sep 19, 1994

Appl. No.:

8/308477

Inventors:

Greg Cedillo - Houston TX
Thomas A. Robertson - Houston TX
Frank C. South - Spring TX
Robert A. Baten - Houston TX
Bruce A. Vicknair - Baytown TX

Assignee:

Stewart & Stevenson Services, Inc. - Houston TX

International Classification:

B01F 1504

US Classification:

366 2

Abstract:

An automated density and chemical controller automatically controls the density and chemical proportions of a slurry that is injected into a well during a well fracturing operation. The automated density controller receives from the operator the parameters of the fracturing operation and automatically controls the addition of a proppant to water to produce a slurry with a desired density. The automated density controller measures the incoming flow of water into a blender tub and regulates the delivery of proppant in the blender tub to produce a slurry of the desired density. The performance characteristics of the mechanism used to deliver the proppant are programmed into the controller to enable the controller to regulate the quantity of proppant delivered by controlling the operational speed of the delivery mechanism. The automated chemical controller regulates the addition of chemicals based on the incoming flow rate. The automated density controller also measures the flow of the slurry discharged from the blender tub and, together with the incoming flow rate, calculates the actual density of the slurry.

US Patent:

52810232, Jan 25, 1994

Filed:

Aug 2, 1989

Appl. No.:

7/389923

Inventors:

Greg Cedillo - Houston TX
Thomas A. Robertson - Houston TX
Frank C. South - Spring TX
Robert A. Baten - Houston TX
Bruce A. Vicknair - Baytown TX

Assignee:

Stewart & Stevenson Services, Inc. - Houston TX

International Classification:

B01F 1504

US Classification:

366 17

Abstract:

An automated density and chemical controller automatically controls the density and chemical proportions of a slurry that is injected into a well during a well fracturing operation to produce a slurry with a desired density. The automated controller automatically controls the addition of a proppant to water based on the parameters of the fracturing operation, the incoming flow of water into a blender tub, the incoming flow rate of chemicals, and the performance characteristics of the mechanism used to deliver the proppant. The automated density controller also measures the flow of the slurry discharged from the blender tub and calculates the actual density of the slurry. After comparing the calculated actual density with the desired density, the automated density controller calculates a correction factor and recalibrates the performance characteristics of the proppant delivery mechanism. The automated density controller also includes a densiometer for measuring the actual density of the slurry. The actual density measured by the densiometer is compared with the calculated actual density to provide an indication of whether the controller is operating correctly.

US Patent:

55909582, Jan 7, 1997

Filed:

Jun 6, 1995

Appl. No.:

8/470976

Inventors:

Michael P. Dearing - Cypress TX
Robert A. Baten - Friendswood TX
Greg L. Cedillo - Houston TX
Bruce A. Vicknair - Baytown TX

Assignee:

Steward & Stevenson Services, Inc. - Houston TX

International Classification:

B01F 1504

US Classification:

366 20

Abstract:

An automatic cementing system and method are disclosed for precisely controlling the density of a slurry during a continuously mixed cement application. The system includes an input water line and a dry cement hopper for supplying water and dry cement, respectively, to a mixing chamber. The mixing chamber includes two chambers, Chamber A and Chamber B, for thoroughly mixing the water and cement together to form a cement slurry. Chamber B includes a level sensor for measuring the change in slurry level. The input line includes a pump for supplying the water to the mixing chamber, and a flow meter for measuring the rate at which the water is supplied. Similarly, the hopper includes a rotary valve for regulating the rate at which the dry cement is supplied to the mixing chamber and a speed sensor for measuring the speed of the rotary valve. A discharge line with a discharge pump and a discharge flow meter receives and discharges cement slurry. A recirculation line is included for density control during initialization.

US Patent:

57758034, Jul 7, 1998

Filed:

Jan 31, 1997

Appl. No.:

8/791936

Inventors:

Clifford Stanley Montgomery - Houston TX
Michael P. Dearing - Cypress TX
Bruce A. Vicknair - Baytown TX
Randall R. Price - Houston TX
Robert A. Baten - Friendswood TX
Greg L. Cedillo - Houston TX
John Howard Craig - Houston TX

Assignee:

Stewart & Stevenson Services, Inc. - Houston TX

International Classification:

B01F 1504

US Classification:

366 2

Abstract:

An automatic cementing system and method are disclosed for precisely controlling the density of a slurry during a continuously mixed cement application. The system includes an input water line and a dry cement hopper for supplying water and cement, respectively, to a mixing chamber. The mixing chamber includes two chambers, Chamber A and Chamber B, for thoroughly mixing the water and cement together to form a cement slurry. Chamber B includes a level sensor for measuring the change in slurry level. The input line includes a pump for supplying the water to the mixing chamber, and a flow meter for measuring the rate at which the water is supplied. Similarly, the hopper includes a slide-gate valve for regulating the rate at which the dry cement is supplied to the mixing chamber. A discharge line with a discharge pump and a discharge flow meter receives and discharges cement slurry. A recirculation line is included for density control during initialization.