초록 ▼

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 c

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. A system controller receives operational parameters from the operator, including desired slurry density, mix water density and dry cement density. Once the rate of the input pump is set, the controller monitors the output from the level sensor in Chamber B and adjusts the rotary valve until the level of slurry in Chamber B is constant. At that time, the amount of water leaving the system as slurry is calculated by the controller, and the controller then sets the rate of the input pump based upon this calculation.

대표청구항 ▼

An automatic cementing system, comprising: a mixing chamber for receiving liquid and dry cement, said mixing chamber mixing the liquid and dry cement together to form a cement slurry; an input line for supplying the liquid to said mixing chamber; means for supplying the dry cement to said mixing cha

An automatic cementing system, comprising: a mixing chamber for receiving liquid and dry cement, said mixing chamber mixing the liquid and dry cement together to form a cement slurry; an input line for supplying the liquid to said mixing chamber; means for supplying the dry cement to said mixing chamber, said supplying means including a means for regulating the rate at which dry cement is delivered; means for discharging the slurry from said mixing chamber; a level sensor for measuring the slurry level in said mixing chamber and generating an electrical signal representing the real time value of the slurry level; a system controller electrically connected to said regulating means of said supplying means and to said level sensor, said controller including: means for receiving the real time slurry level values from said level sensor; means for storing a plurality of said slurry level values periodically sensed by said level sensor; means for generating a reference signal by averaging said plurality of slurry level values; means for comparing said reference signal with the real time slurry level in said mixing chamber; and means for transmitting a signal to said regulating means to change the rate of delivery of dry cement to the mixing chamber in response.