Tension/collar/reamer assemblies and methods
The present invention provides drilling assembles and methods that are especially useful for a bottom hole drilling assembly for drilling/reaming/or other operations related to drilling a borehole through an earth formation. In one embodiment, the drilling assembly utilizes standard drill collars which are modified to accept force transfer sections. In another embodiment, the drilling assembly comprises a tension inducing sub which creates a force that may be used to place the bottom hole assembly or portions thereof in tension. In another embodiment, a reaming assembly is held in tension to provide a stiffer reaming assembly.
1. A method for making a heavy weight section for a bottom hole assembly for drilling a bore hole through an earth formation, said bottom hole drilling assembly being secured to an end of a drill pipe string and being operable for applying drilling weight to a drill bit for drilling said bore hole, said method comprising:
providing a first outer tubular comprising an outer tubular radial wall thickness;
positioning a first top sub on one end of said first outer tubular;
positioning a first bottom sub on an opposite end of said first outer tubular;
providing a high density weight section inside said first outer tubular for supplying at least a portion of said drilling weight to said drill bit,
providing that high density weight section comprises a specific gravity greater than 10.0; and
providing that said high density weight section comprises a high density radial wall thickness which is at least 25% greater than said outer tubular radial wall thickness.
2. The method of claim 1 , further comprising providing that said high density radial wall thickness is at least 50% greater than said outer tubular radial wall thickness.
3. The method of claim 1 , further positioning a centralizer between said high density weight section and said first outer tubular to prevent a radial movement of said high density weight section with respect to said first outer tubular.
4. The method of claim 1 , further comprising positioning a first inner tubular inside of said high density weight section, said first inner tubular defining a fluid flow path therethrough.
5. The method of claim 4 , further comprising providing fluid tight sealing between said first inner tubular and said high density weight section.
6. The method of claim 1 , further comprising mounting said high density weight section for limited sliding axial movement of said first high density weight section with respect to said first outer tubular.
7. The method of claim 1 , further comprising mounting said high density weight section to prevent axial movement of said first high density weight section with respect to said first outer tubular.
8. The method of claim 1 , further comprising: providing a second outer tubular that is securable with respect to said first bottom sub, and providing at least one additional annular high density weight section within said second outer tubular.
9. The method of claim 1 , further comprising forming said high density weight section by inserting powdered tungsten or a tungsten slurry into said first outer tubular.
10. A method for making a plurality of heavy weight sections for a bottom hole drilling assembly, said bottom hole drilling assembly being utilized for drilling a bore hole through an earth formation, said bottom hole drilling assembly being secured to a drill pipe string and being operable for applying a drilling weight to a drill bit for drilling said bore hole such that during drilling then a length of said bottom hole drilling assembly is in tension and a length of said bottom hole assembly adjacent to said drill bit is in compression, said plurality of weight sections comprising:
providing a plurality of connections for connecting between said plurality of heavy weight sections:
providing a plurality of slidable members which transfer force through said plurality of connections, whereby when said drilling weight on said drilling bit during drilling is greater than 10,000 pounds then said length of said bottom hole assembly in compression is less than fifty feet.
11. The method of claim 10 , further comprising providing at least one high density weight section comprises a specific gravity greater than 10.0 within at least one of said plurality of heavy weight sections.
12. The method of claim 10 , further comprising when said drilling weight on said drilling bit during drilling is greater than 10,000 pounds then said length of said bottom hole assembly in compression is less than twenty-five feet.
13. A plurality of heavy weight sections for a bottom hole drilling assembly, said bottom hole drilling assembly being utilized for drilling a bore hole through an earth formation, said bottom hole drilling assembly being secured to a drill pipe string and being operable for applying a drilling weight to a drill bit for drilling said bore hole such that during drilling then a length of said bottom hole drilling assembly is in tension and a length of said bottom hole assembly adjacent to said drill bit is in compression, said plurality of weight sections comprising:
a plurality of connections which connect between said plurality of heavy weight sections:
a plurality of slidable members connected to transfer force through said plurality of connections, whereby when said drilling weight on said drilling bit during drilling is greater than 10,000 pounds then said length of said bottom hole assembly in compression is less than fifty feet.
14. The plurality of heavy weight sections of claim 13 , further comprising at least one high density weight section positioned with at least one of said plurality of heavy weight sections which comprises a specific gravity greater than 10.0.
15. The plurality of heavy weight sections of claim 13 , further comprising that plurality of slidable members connected to transfer force through said plurality of connections whereby when said drilling weight on said drilling bit during drilling is greater than 10,000 pounds then said length of said bottom hole assembly in compression is less than twenty-five feet.