Installation of one-way valve after removal of retrievable drill bit to complete oil and gas wells

Abstract

A method of drilling and completing a wellbore in a geological formation to produce hydrocarbons from a well comprising at least the following four steps: drilling the well with a retrievable drill bit attached to a casing; removing the retrievable drill bit from the casing; pumping down a one-way valve into the casing with a well fluid; and using the one-way valve to cement the casing into the wellbore. Other methods are described to drill and complete wellbores in a geological formation with different types of pipes following the removal of retrievable, or retractable, drill bits from the pipes by using pump-down one-way valves.

1 . A method of drilling and completing a wellbore in a geological formation to produce hydrocarbons from a well comprising: 
 drilling the well with a drill bit attached to a casing; and    bonding the casing with the wellbore while the drill bit remains attached to the casing.    
   
   
       2 . The method of claim  7 , further comprising supplying cement to bond the casing with the wellbore.  
   
   
       3 . A method of drilling, comprising: 
 providing a tubular string having a casing portion, the casing portion having a cutting structure connected thereto;    operating the cutting structure and lowering the tubular string into a wellbore of a desired depth; and    supplying cement through the casing while the cutting structure remains attached to the casing.