Methods and apparatus for actuating a downhole tool

A method for remotely actuating a downhole tool, comprising:

• providing the downhole tool with a radio frequency tag reader, wherein the downhole tool comprises:
• a collar;
• a float valve;
• and
• a drillable material for coupling the float valve to the collar;
• broadcasting a signal;
• positioning a radio frequency tag proximate the drillable material;
• generating a reflected signal;
• and
• actuating the downhole tool according to the reflected signal;
• and
• drilling through the downhole tool upon completion.

A method of performing a cementing operation to install a casing in a wellbore comprising:

• positioning the casing within the wellbore;
• locating a valve within an inner bore of the casing, the valve having a sensor and a flapper for opening and closing a valve bore;
• flowing cement through the valve and into an annulus between the wellbore and the casing;
• communicating with the sensor from the surface of the welibore;
• operating an actuator based on the communication from the surface;
• and
• closing the valve bore.

A downhole valve assembly for use in a downhole tubular comprising:

• a valve located within an inner bore of the downhole tubular and the valve includes a flapper for opening and closing a valve bore, wherein the valve is composed of a drillable material;
• a collar for coupling the valve to the tubular;
• a drillable material for coupling the valve to the collar;
• an actuator for operating the valve between an opened and a closed position;
• a controller for activating the actuator;
• and
• a sensor for detecting a condition in the wellbore, wherein the detected condition is transmitted to the controller, thereby causing the actuator to operate the valve.