| 摘要 |
A method and system for drilling or cutting a subterranean well or formation (52) using a drilling rig (5), a drill string (55), a plurality of solid material impactors (100), a drilling fluid and a drill bit (60) is disclosed . This invention may have particular utility in drilling wells for the petrole um industry and for cutting formation in the mining and tunnel boring industrie s. In a preferred embodiment, a plurality of solid material impactors are introduced into the drilling fluid and pumped through the drill string and drill bit to impact the formation ahead of the bit. At the point of impact, a substantial portion by weight of the impactors may have sufficient energy to structurally alter, excavate, and/or fracture the impacted formation. The majority by weight of the plurality of solid material impactors may have a mean diameter of at least 0.100 inches, and may structurally alter the formation to a depth of at least twice the mean diameter of the particles comprising the impacted formation. Impactor mass and/or velocity may be selected to satisfy a mass-velocity relationship in the respective impactor sufficient to structurally alter the formation. Rotational, gravitational, kinetic and/or hydraulic energy available at the bit in each of the bit, the impactors and the fluid may thereby more efficiently effect the generation a nd removal of formation cuttings ahead of the bit.
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