초록 ▼

A particle impact drilling system and method are described. In several exemplary embodiments, the system and method may be a part of, and/or used with, an apparatus or system, methods, to excavate a subterranean formation. The system can including, for example, removing near-borehole damage, casing,

A particle impact drilling system and method are described. In several exemplary embodiments, the system and method may be a part of, and/or used with, an apparatus or system, methods, to excavate a subterranean formation. The system can including, for example, removing near-borehole damage, casing, window milling, fishing, drilling with casing, under reaming, coring, perforating, effective circulatory density management, assisted annular flow, and directional control. Embodiments of associated systems and methods are also included.

대표청구항 ▼

The invention claimed is: 1. A wellbore under reamer apparatus comprising:a) a drill string;b) a bit in fluid communication with the drill string wherein an annulus is defined between the well bore and an exterior surface of the drill string and the bit above a terminal end of the bit that is substa

The invention claimed is: 1. A wellbore under reamer apparatus comprising:a) a drill string;b) a bit in fluid communication with the drill string wherein an annulus is defined between the well bore and an exterior surface of the drill string and the bit above a terminal end of the bit that is substantially uninterrupted along an extent of the drill string and the bit;c) at least one nozzle in fluid communication with the drill string;d) a mixture of a pressurized circulating fluid and a plurality of impactors flowing through the drill string and being discharged directly into the annulus from a nozzle exit that is oriented so that when the drill string and nozzle are disposed in a wellbore a portion of the plurality of impactors are discharged from the nozzle exit directly into the annulus to intersect and contact a formation with sufficient velocity to structurally alter the formation and increase the wellbore diameter.