CEMENTING METHODS AND SYSTEMS FOR INITIATING FLUID FLOW WITH REDUCED PUMPING PRESSURE

A method of initiating fluid circulation in a well bore (6) through a casing (3) inner diameter and an annulus (5) outside the casing, the method having the following steps: inducing an increase in the annulus fluid pressure; flowing cement composition into the annulus at the top of the well bore; maintaining a difference in pressure between the fluid pressure of the casing inner diameter and the fluid pressure of the annulus until enough cement composition has entered the annulus to drive fluid circulation by the added cement composition weight. A method of cementing a casing in a well bore, wherein an annulus is defined between the casing and the well bore, the method having the following steps: connecting a circulation fluid pump to the casing inner diameter; pumping circulation fluid out of the casing inner diameter, whereby fluid flow in a reverse-circulation direction through the casing inner diameter and annulus is initiated; maintaining fluid flow in a reverse-circulation direction through a well bore annulus and the casing inner diameter until enough cement composition has entered the annulus to drive fluid circulation by the added cement composition weight; disconnecting the low-pressure cement composition pump from the annulus; and flowing additional cement composition into the annulus to complete a cement composition operation. Un metodo para comenzar la circulacion de un fluido en un sondeo a traves de un diametro interior de la tuberia de revestimiento y un anillo fuera de la tuberia de revestimiento el metodo tiene los siguientes pasos: inducir un aumento en la presion de flujo del anillo; hacer fluir la composicion de cemento en la parte superior del anillo de la tuberia de revestimiento; mantener una diferencia de presion entre la presion de fluido del diametro interior de la tuberia de revestimiento y la presion de fluido del anillo hasta que haya entrado bastante composicion de cemento en el anillo para conducir la circulacion del fluido por el peso de la composicion del cemento agregado; un metodo de cementacion de una tuberia de revestimiento de un sondeo, en donde se define un anillo entre la tuberia de revestimiento y el sondeo, el metodo tiene los siguientes pasos: conectar una bomba de circulacion de fluido a la diametro interior de la tuberia de revestimiento; bombear la circulacion de fluido hacia fuera del diametro interior de la tuberia de revestimiento, con lo que comienza el flujo de fluidos en una direccion de circulacion-in