Boring or penetrating the earth – Bit or bit element – Core forming type
Patent
1984-09-19
1986-09-09
Lechert, Jr., Stephen J.
Boring or penetrating the earth
Bit or bit element
Core forming type
295272, 164 46, 419 9, 419 18, 419 23, 419 35, 419 64, 427214, 427405, 428564, 4289088, E21B 1000
Patent
active
046103201
ABSTRACT:
A method is disclosed for applying hard tungsten carbide particles to the surface of metal stabilizers used in the drilling of oil, gas, geothermal and water wells. The process consists of applying a soft, elastic metal powder to the surface of the substrate. Large tungsten carbide particles, which have also been coated with the soft powder, are placed on top of the layer of soft powder. The particles are then covered with additional soft powder, which powder is then fused to form a homogeneous, large tungsten carbide particle containing mixture bonded to the substrate. A hard matrix is applied and fused over the large tungsten carbide particle containing mixture. The large tungsten carbide particles, which have a low coefficient of expansion, are thereby contained in a soft elastic metal matrix which acts as an expansion and cushion material, while the hard matrix presents a less resilient, more wear resistant surface. This arrangement is advantageous because the coefficient of expansion of the hard matrix material is much higher than the coefficient of expansion of the carbide particles. The soft elastic matrix thereby cushions the carbide particles and prevents them from being crushed as the hard matrix expands and contracts in response to changing temperatures and conditions.
REFERENCES:
patent: 3322536 (1967-05-01), Stoddard et al.
patent: 4218494 (1980-08-01), Belmondo et al.
Directional Enterprises, Inc.
Lechert Jr. Stephen J.
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