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US 2013/0277121 A1Published application
Downhole tools and parts and methods of formation
AssigneeBaker Hughes Incorporated
InventorsJohn H. Stevens, Jimmy W. Eason
Life of this patent
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Abstract
Methods, systems, and compositions for manufacturing downhole tools and downhole tool parts for drilling subterranean material are disclosed. A model having an external peripheral shape of a downhole tool or tool part is fabricated. Mold material is applied to the external periphery of the model. The mold material is permitted to harden to form a mold about the model. The model is eliminated and a composite matrix material is cast within the mold to form a finished downhole tool or tool part.
Claims20
A downhole tool, comprising:
- a composite matrix material separated into material phases comprising:
- a continuous phase of cobalt;
- and
- a particulate phase of a carbide dispersed within the continuous phase of cobalt, the composite matrix material having an at least near eutectic composition comprising:
- the cobalt constituting greater than about 70 atomic percent of the at least near eutectic composition;
- and
- the carbide constituting less than about 30 atomic percent of the at least near eutectic composition.
4 more elements
A method of forming a downhole tool, comprising:
- casting a composite matrix material within a mold, the composite matrix material comprising an at least near eutectic composition comprising cobalt and a carbide, the cobalt constituting greater than about 70 atomic percent of the at least near eutectic composition, the carbide constituting less than about 30 atomic percent of the at least near eutectic composition;
- and
- hardening the composite matrix material to separate at least some of the cobalt into a cobalt continuous phase and at least some of the carbide into a carbide particulate phase dispersed throughout the cobalt continuous phase.
A downhole tool part, comprising:
- a bit body element comprising a cobalt content of less than 20 weight percent;
- a composite matrix material bonded to the bit body element, the composite matrix material formed form an at least near eutectic composition comprising about 75 atomic percent cobalt and about 25 atomic percent monotungsten carbide;
- and
- a particulate material dispersed in the composite matrix material.
1 more element
Dependencies are inferred from the claim text.