STAGE TOOL FOR WELLBORE CEMENTING

摘要

A stage tool for cementing a wellbore annulus, comprising: a main body including a tubular wall with an outer surface and an inner bore extending from a top end to a bottom end; a cementing port through the tubular wall providing fluidic access between the longitudinal bore and the outer surface; a valve for controlling flow through the cementing port between the outer surface and the inner bore; and a plug sealing a circulation path between the valve and the outer surface, the plug being expellable by pressure applied from the inner bore. The stage tool may be run in with the plug isolating annular pressure from the valve. After sufficient cement has been introduced to the annulus, the stage tool fluid port can be closed to hold the cement in the annulus.

主权项

1. A method for cementing a tubing string in a wellbore, the method comprising: positioning the tubing string with a stage tool in the wellbore, an annulus being defined between the stage tool and the wellbore wall; expelling a plug from over a cementing port of the stage tool by pressuring up an inner bore of the stage tool; pumping cement into the annulus; and closing the cementing port to hold the cement in the annulus to provide time for the cement to set.