Drill bit and other downhole tools having electro-negative surfaces and sacrificial anodes to reduce mud balling
AssigneeBarold Technology, Inc.
InventorsWilliam C. Paske, Paul F. Rodney, Ronald D. Ormsby
Life of this patent
Estimating the term…
Abstract
Various steel, downhole tools and components of a drill string, including, as examples, a PDC drill bit, a rotary rock bit, a cross-over sub, a stabilizer, a reamer, a hole enlarger and a coring bit, are selectively treated to cause certain of their parts to be electro-negative with respect to steel, and certain other parts to either have the same electro-negativity as steel, or to be treated to be electro-positive with respect to steel.
Claims59
A drill bit adapted to be connected to a drill string, comprising:
- a steel bit body having a first end defining a cutting face, said cutting face having a plurality of cutters mounted therein;
- said steel bit body having a second end defining a tubular body adapted to be threaded into a drill string;
- and
- said steel bit body having a portion thereof intermediate said first and second ends defining an exterior peripheral stabilizer surface, said drill bit being characterized by said cutting face being electro-negative with respect to the standard reduction potential of steel.
A portion of a drill string for drilling an earth borehole, comprising in combination:
- a steel bit body having a first end defining a cutting face, said cutting face having a plurality of cutters mounted therein;
- said steel bit body having a second end defining a tubular body adapted to be threaded into a steel cross over sub, and
- a steel cross-over sub being adapted to threadedly mate with said second end of said drill bit, said combination being characterized by at least a portion of said steel bit body being electro-negative with respect to the standard reduction potential of steel.
A drill bit adapted to be connected to a drill string, comprising:
- a steel bit body having a first end having a plurality of rotatable cutting elements mounted thereto;
- said steel bit body having a second end defining a tubular body adapted to be threaded into a drill string;
- and
- said steel bit body having a portion thereof intermediate said first and second ends defining an exterior peripheral stabilizer surface, said drill bit being characterized by said first end of said bit body being electro-negative with respect to the standard reduction potential of steel.
A portion of a drill string for drilling an earth borehole, comprising in combination:
- a steel bit body having a first end having a plurality of rotatable cutting elements mounted thereto;
- said steel bit body having a second end defining a tubular body adapted to be threaded into a steel cross over sub, and
- a steel cross-over sub being adapted to threadedly mate with said second end of said drill bit, said combination being characterized by at least a portion of said steel bit body being electro-negative with respect to the standard reduction potential of steel.
A drill coring bit adapted to be connected to a drill string, comprising:
- a steel bit body having a first end defining a coring face, said coring face having a plurality of cutters mounted therein and a center orifice for receiving a core;
- said steel bit body having a second end defining a tubular body adapted to be threaded into a drill string;
- and
- said steel bit body having a portion thereof intermediate said first and second ends defining an exterior peripheral stabilizer surface, said coring bit being characterized by said coring face being electro-negative with respect to the standard reduction potential of steel.
A stabilizer for use in a drill string, comprising:
- a steel stabilizing body having first and second ends adapted to be threaded into a drill string;
- said steel stabilizing body having a portion intermediate said first and second ends sized to bear against the borehole wall, said intermediate portion being electro-negative with respect to the standard reduction potential of steel.
A borehole enlarging apparatus for use in a drill string, comprising:
- a steel body having first and second ends adapted to be threaded into a drill string;
- said steel body having expandable cutter arms mounted in a portion of said steel body intermediate said first and second ends, said intermediate portion being electro-negative with respect to the standard reduction potential of steel.
A downhole apparatus adapted to be connected in a drill string, comprising:
- a steel body;
- said steel body having at least one end adapted to be threadedly connected to said drill string, said apparatus being characterized by at least a portion of said steel body being electro-negative with respect to the standard reduction potential of steel.
A downhole apparatus combination adapted to be connected in a drill string, comprising:
- a first steel body, said first steel body being adapted to be threadedly connected into said drill string;
- a second steel body, said second steel body being adapted to be threadedly connected into said drill string, said combination being characterized by at least a portion of one of said bodies being electro-negative with respect to the standard reduction potential of steel.
A downhole apparatus combination adapted to be connected in a drill string, comprising:
- a first steel body, said first steel body being adapted to be threadedly connected into said drill string;
- a second steel body, said second steel body being adapted to be threadedly connected into said drill string, said combination being characterized by at least a portion of one of said bodies being electro-positive with respect to the standard reduction potential of steel.
A downhole apparatus combination adapted to be connected in a drill string, comprising:
- a first steel body, said first steel body being adapted to be threadedly connected into said drill string;
- a second steel body, said second steel body being adapted to be threadedly connected into said drill string, said combination being characterized by at least a portion of said first body being electro-negative with respect to the standard reduction potential of steel, and by at least a portion of said second body being electro-positive with respect to the standard reduction potential of steel.
A downhole apparatus adapted to be connected in a drill string, comprising:
- a steel body;
- said steel body having at least one end adapted to be threadedly connected to said drill string, said apparatus being characterized by at least a portion of said steel body being electro-positive with respect to the standard reduction potential of steel.
Dependencies are inferred from the claim text.