Patent ID: 6997272

Claim:
An assembly for drilling a deviated borehole from the surface using drilling fluids, comprising: a bottom hole assembly connected to a string of coiled tubing extending to the surface, said coiled tubing having a flowbore for the passage of drilling fluids; said bottom hole assembly including a bit driven by a downhole motor powered by the drilling fluids, said bottom hole assembly and string forming an annulus with the borehole; a surface pump at the surface to pump the drilling fluids downhole; a first cross valve associated with said surface pump providing a first path directing drilling fluids down said flowbore and a second path directing drilling fluids down said annulus; a second cross valve adjacent the bottom hole assembly having an open position allowing flow through an opening between said flowbore and said annulus above said downhole motor and a closed position preventing flow through said opening; a first flow passageway directing drilling fluids through said first path, through said bottom hole assembly, and then up said annulus; and a second flow passageway directing drilling fluids through said second path, through said opening, and then up said flowbore.