Stabilizer for single or dual tube drilling

A stabilizer for use with a string of dual concentric drill pipe above a bit including an inner and outer pipe positioned concentrically to form an annular conduit and central conduit, comprising:

• a cylindrical body;
• a first passageway in said body communicating with the annular conduit between the inner and outer pipes of said string to provide a first flow path from surface to bit;
• a second passageway in said body communicating with the central conduit of the inner pipe of said string to provide a second flow path isolated from said first flow path, to permit cuttings to be carried from the bit vicinity to surface;
• a sleeve bearing encircling said cylindrical body and mounted on said body and forming clearance space between the adjacent surface of the cylindrical body;
• a stabilizer sleeve mounted stationary on said sleeve bearing;
• a thrust bearing above the upper end of said stabilizer sleeve and sleeve bearing;
• a first series of flushing nozzles in said cylindrical body fluid connection between said first passageway and the surface of said sleeve bearing;
• a second series of flushing nozzles in said cylindrical body providing fluid connection between said first passageway and said thrust bearing;
• and
• a series of exit ports in the lower end of the stabilizer sleeve and sleeve bearing providing fluid communication between the clearance space between the sleeve bearing and cylindrical body and the outer surface of said stabilizer.

A stabilizer for use with a string of single tube drill pipe above a bit, comprising;

• a cylindrical body;
• a passageway in said body communicating with the conduit of the pipe of the string to provide a flow path from surface to bit;
• a sleeve bearing encircling said cylindrical body and mounted to rotate with respect to said cylindrical body said stabilizer sleeve bearing and cylindrical body forming a clearance space between their adjacent surfaces;
• a stabilizer sleeve mounted stationary on said sleeve bearing;
• a thrust bearing above the upper end of said stabilizer sleeve and sleeve bearing;
• a first port means in said cylindrical body providing fluid connection between said passageway in the cylindrical body and the clearance space between said sleeve bearing and said cylindrical body;
• a second port means in said cylindrical body providing fluid connection between said passageway in the cylindrical body and said thrust bearing;
• and
• an exit port means in the lower end of the stabilizer sleeve and sleeve bearing providing fluid connection between the clearance space between said sleeve bearing and said stabilizer body and the exterior of the stabilizer.

A stabilizer for use with a string of dual concentric drill pipe above a bit including an inner and outer pipe positioned concentrically, comprising:

• an outer tubular member threaded at each end for engagement with correspondingly threaded ends of outer pipes of two engaging segments of said string;
• an inner tubular member disposed concentrically within said outer member and adapted at one end for telescopic interconnection with the inner pipe of the other of said segments of said string so as to permit a limited degree of relative axial movement therebetween, the other end of said inner member being adapted for interconnection with the other engaging inner pipe in coaxial alignment therewith to form a continuous fluid conduit through said inner member and inner pipes;
• an annular chamber defined between the outer surface of said inner member and the inner surface of said outer member, said inner and outer members being connected at one point along their length;
• a stabilizer means encircling said outer member and adapted to contact the hole wall, said stabilizer means being mounted so as to rotate with respect to said outer member;
• said outer tubular member and stabilizer means forming a clearance space between their adjacent surfaces;
• and
• a port means in said outer tubular member providing fluid communication between said annular chamber and said clearance space.

A stabilizer for use with a string of dual concentric drill pipe above a bit including an inner and outer pipe positioned concentrically, conprising:

• an outer tubular member threaded at each end for engagement with correspondingly threaded ends of outer pipes of two engaging segments of said string;
• an inner tubular member disposed concentrically within said outer member and adapted at one end for telescopic interconnection with the inner pipe of the other of said segments of said string so as to permit a limited degree of relative axial movement therebetween, the other end of said inner member being adapted for interconnection with the other engaging inner pipe in coaxial alignment therewith to form a continuous fluid conduit through said inner member and inner pipes;
• an annular chamber defined between the outer surface of said inner member and the inner surface of said outer member, said inner and outer members being connected at one point along their length;
• and
• a stabilizer means encircling said outer member and adapted to contact the hole wall, said stabilizer means including a sleeve bearing encircling said outer tubular member and mounted to rotate with respect to the outer member and a stabilizer sleeve mounted stationary on said sleeve bearing.