John Craig

56241828, Apr 29, 1997

Feb 27, 1995

8/394476

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

Stewart & Stevenson Services, Inc. - Houston TX

B01F 1504

366 2

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.

57758034, Jul 7, 1998

Jan 31, 1997

8/791936

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

Stewart & Stevenson Services, Inc. - Houston TX

B01F 1504

366 2

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.