Apparatus for spinning drill pipe
Spinners for spinning drill pipe to rotary drill wells wherein the spinners have one or more drive rollers wherein one embodiment the drive rollers have an upper section that is a metal core with an upper flanged area and a lower section comprised of an elastomeric material. In a second embodiment the surface areas of the drive rollers that contact the drill pipe are all metallic and the drive rollers have an upper cylindrical section and one or more conical sections below the upper cylindrical section that are progressively smaller in diameter moving downward from the upper cylindrical section. In a third embodiment the surface areas of the drive rollers that contact the drill pipe are all metallic and are comprised of a cylindrical section and a predominately spherical section below the cylindrical section. In a fourth embodiment the surface area of the drive rollers that contacts the drill pipe is all metallic and has a predominately spherical section.
1. A device for spinning drill pipe having a uniform cylindrical pipe section, a tool joint attached to each end of the pipe section, and a transition zone located between each end of the pipe section and the corresponding tool joint, the transition zone having a rough outer surface and being of varying diameter, said device comprising:
a spinner frame moveable between a first position and a second position; and
a drive roller rotatably attached to said spinner frame, said drive roller being spaced apart from the drill pipe when said spinner frame is in said first position and said drive roller being in contact with the drill pipe when said spinner frame is in said second position;
said drive roller having an upper section positioned on said driver roller so as to contact a portion of the pipe section above the transition zone when said spinner frame is in said second position to spin the drill pipe;
said drive roller having a lower section composed of a compressible elastomeric material;
said lower section positioned on said drive roller so as to contact the transition zone when said spinner frame is in said second position to spin the drill pipe;
wherein said upper section has a predetermined diameter and said lower section has a first diameter when said spinner frame is in said first position and a second diameter when said spinner frame is in said second position, and wherein said first diameter extends beyond said predetermined diameter and said second diameter is generally the same as said predetermined diameter.
2. The device of claim 1 , wherein, said upper section is formed of a metallic material.
3. The device of claim 2 , wherein said metallic material is steel.
4. The device of claim 3 , wherein said steel is AISI 4140 steel heat treated to 30Rc hardness.
5. The device of claim 2 , wherein said metallic material is selected from steel that is not heat treated, aluminum, bronze, and copper based alloys.
6. The device of claim 1 , wherein said elastomeric material is a rubber.
7. The device of claim 1 , wherein said elastomeric material contains a solid abrasive.
8. The device of claim 7 , wherein said solid abrasive is one or more selected from among sand and metal powder.
9. The device of claim 1 , wherein said elastomeric material contains a fiber material.
10. The device of claim 9 , wherein said fiber material is selected from glass fiber, carbon fiber, Kevlar, nylon and combinations of these.
11. The device of claim 1 , wherein said lower section has proximate end and an opposite distal end, said proximate end abuts a lower surface of said upper section, and said distal end being in unobstructed communication with free space.
12. The device of claim 1 , wherein said upper section is a radially extending lip extending from a core section, and wherein said lower section includes an exterior surface and an opposite interior surface, said exterior surface contacts the transition zone when in said second position and said interior surface being bonded to said core section.