Patent ID: 6098710
Filing Date: 2000-08-08
Classification: E21B

Abstract:
A method of cementing a wellbore comprisingproviding a casing in a wellbore;drilling a segment of enlarged wellbore through said casing; providing in the casing a liner-tool assembly comprising a wellbore liner having ports for wellbore fluid flow, and a fluid circulating tool disposed in said liner, said liner-tool assembly adapted to provide a first fluid flow path for transmission of a fluid through the fluid circulating tool and liner and into a wellbore, and a second separate fluid flow path for transmitting fluid received from exterior the liner through the ports and through the fluid circulating tool in a direction opposite that of said first fluid flow path;positioning the liner-tool assembly in the wellbore so that the ports are positioned proximate and beneath the casing in the enlarged wellbore;pumping a cement slurry through the first fluid flow path of the liner assembly and into the enlarged wellbore annulus in an amount sufficient to cement said wellbore annulus while allowing wellbore fluid from the enlarged wellbore to pass through said ports into the second fluid flow path and into the casing;and allowing the cement to set.