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US 7,121,365 B2Granted
Rock bit with grease composition utilizing polarized graphite
AssigneeSmith International, Inc.
InventorsRobert M. Denton, Alan W. Lockstedt
Life of this patent
Estimating the term…
Abstract
A lubricating grease is specific for a rock bit for drilling subterranean formations. The rock bit body includes a plurality of journal pins, each having a bearing surface, with a cutter cone mounted on each journal pin and also including a bearing surface. A grease reservoir provides lubricating grease to such bearing surfaces. The grease composition adjacent the bearing surfaces comprises a lubricating base oil, sufficient thickener and additives in the base oil to form a rock bit grease, and an effective amount of polarized graphite.
Claims31
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a grease composition in the grease reservoir and adjacent the bearing surfaces comprising,
- from about 1 to 8 percent by weight polarized graphite;
- in the range of from about 55 to 95 percent by weight synthetic lubricant basestocks;
- in the range of from about 5 to 10 percent by weight molybdenum disulfide, and
- in the range of from about 1 to 5 percent by weight hexagonal boron nitride.
6 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a grease composition in the grease reservoir and adjacent the bearing surfaces comprising,
- copper particles in the range of from 3 to 9% by weight,
- molybdenum disulfide particles in the range of from 6 to 14% by weight,
- polarized graphite in the range of from 1 to 8% by weight, and
- a metal soap wherein the metal is selected from the group consisting of aluminum, barium, calcium, lithium, sodium and strontium, and mixtures thereof, and a balance of primarily hydrocarbon oil.
6 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a grease composition in the grease reservoir and adjacent the bearing surfaces comprising,
- about 75% of ultra-high molecular weight polyalphaolefin,
- about 10% lower molecular weight polyalphaolefin,
- about 1.5 to 2% polyisobutylene,
- about 5% of extreme pressure additive,
- about 3% of a friction reducing agent, and
- about 6 to 8% (by volume relative to the other ingredients) of polarized graphite.
8 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a grease composition in the grease reservoir and adjacent the bearing surfaces comprising,
- about 75% (by weight) of ultra-high molecular weight polyalphaolefin,
- about 6% lower molecular weight polyalphaolefin,
- up to about 3% polyisobutylene,
- about 5% of extreme pressure additive,
- up to about 3% of a friction reducing agent,
- about 5% of silica, and
- about 3 to 8% (by volume relative to the other ingredients) of polarized graphite.
9 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a grease composition in the grease reservoir and adjacent the bearing surfaces comprising,
- a multi-purpose heavy duty hydrocarbonaceous lubricant thickened by an alkaline soap to form a lubricating grease,
- from about 1 to 8% by weight of polarized graphite,
- from about 1 to 20% by weight of powdered molybdenum disulfide, and
- from about 1 to 20% by weight of powdered calcium fluoride, the weight percent ratio of powdered molybdenum disulfide to powdered calcium fluoride being in the range from about 1:6 to 6:1.
6 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a grease composition in the grease reservoir and adjacent the bearing surfaces comprising,
- a multi-purpose heavy duty hydrocarbonaceous lubricant thickened by an alkaline soap to form a lubricating grease,
- from about 1 to 8% by weight of polarized graphite,
- from about 1 to 20% by weight of powdered molybdenum disulfide, and
- from about 1 to 20% by weight of powdered calcium fluoride present in an effective amount, to produce a lubricating grease that is stable at temperatures up to at least 300° F. and having an ASTM worked penetration of no less than 265, and wherein the total solids content of the lubricating grease is in the range from about 3–30% by weight of the grease.
6 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a heavy duty lubricating grease composition in the grease reservoir and adjacent the bearing surfaces comprising a substantially uniform dispersion including,
- a multi-purpose heavy duty hydrocarbonaceous lubricant thickened by a calcium acetate complex to form a lubricating grease, and
- effective amounts of:
- polarized graphite,
- powdered metallic oxide selected from the group consisting of antimony trioxide, zinc oxide, lead oxide, nickel oxide, tungsten trioxide, vanadium pentoxide and copper oxide, and
- powdered molybdenum disulfide.
7 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a heavy duty lubricating grease composition in the grease reservoir and adjacent the bearing surfaces comprising a substantially uniform dispersion including,
- a multi-purpose heavy duty hydrocarbonaceous lubricant thickened by a calcium acetate complex to form a lubricating grease,
- particles of molybdenum disulfide that are small enough to pass 100 percent through a 100 mesh screen and 85 percent through a 325 mesh screen, and particles of antimony trioxide that are small enough to pass 100 percent through a 100 mesh screen and 90 percent through a 325 mesh screen, and
- effective amounts of:
- polarized graphite, and
- powdered metallic oxide selected from the group consisting of antimony trioxide, zinc oxide, lead oxide, nickel oxide, tungsten trioxide, vanadium pentoxide and copper oxide.
7 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a heavy duty lubricating grease composition in the grease reservoir and adjacent the bearing surfaces comprising a substantially uniform dispersion including,
- a multi-purpose heavy duty hydrocarbonaceous lubricant thickened by a calcium acetate complex to form a lubricating grease,
- molybdenum disulfide in an amount within the range of 7 to 20 percent by weight and metallic oxide in an amount within the range of 5 to 20 percent by weight, and
- effective amounts of:
- polarized graphite, and
- powdered metallic oxide selected from the group consisting of antimony trioxide, zinc oxide, lead oxide, nickel oxide, tungsten trioxide, vanadium pentoxide and copper oxide.
7 more elements
A method for lubricating a rock bit for drilling subterranean formations comprising operating the bit containing a grease composition comprising:
- a lubricating base oil;
- sufficient thickener and additives in the base oil to form a rock bit grease;
- from about 1 to 8 by weight polarized graphite;
- and
- effective amount of molybdenum disulfide.
2 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- a grease composition in the grease reservoir and adjacent the bearing surfaces comprising:
- a lubricating base oil;
- sufficient thickener and additives in the base oil to form a rock bit grease;
- molybdenum disulfide;
- and
- from about 1 to 8 percent by weight polarized graphite.
6 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- a grease composition in the grease reservoir and adjacent the bearing surfaces comprising:
- a lubricating base oil;
- sufficient thickener and additives in the base oil to form a rock bit grease;
- and
- from more than 6 percent by weight polarized graphite.
5 more elements
A rock bit for drilling subterranean formations comprising:
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a grease composition in the grease reservoir and adjacent the bearing surfaces comprising a substituted conventional rock bit grease composition in which polarized graphite is substituted for graphite and/or hexagonal boron nitride in an unsubstituted conventional rock bit grease composition on a one-for-one basis.
2 more elements
A rock bit for drilling subterranean formations comprising;
- a bit body including a journal pin having a bearing surface;
- a cutter cone mounted on the journal pin and including a bearing surface;
- a grease reservoir in communication with such bearing surfaces;
- and
- a grease composition in the grease reservoir and adjacent the bearing surfaces comprising a substituted conventional rock bit grease composition in which an effective amount of polarized graphite is substituted for graphite and/or hexagonal boron nitride in an unsubstituted conventional rock bit grease composition.
2 more elements
Dependencies are inferred from the claim text.