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Water-jet-assisted Drag Bit Cutting in Medium-strength Rock.

Authors
Geier-JE; Hood-M; Thimons-ED
Source
MISSING :10 pages
Link
NIOSHTIC No.
10006081
Abstract
This Bureau of Mines report reviews hypotheses for the mechanism by which water jets reduce the specific energy of cutting for drag bits. Several of these hypotheses are shown to be inconsistent with published evidence and new observations. The notion of a limiting cutting speed, above which water jets would be incapable of rendering assistance, is shown to be improbable. The hypothesis that seems most plausible is that specific energy reductions are mainly due to the erosion of crushed materials from in front of the bit. This hypothesis leads to a prediction that, for a given rock type and jet-bit configuration at a constant depth of cut, the reduction in bit forces should be a function of dw/dx, the jet energy spent per unit length of cut. This dependence upon dw/dx is shown to be consistent with other workers' results.
Publication Date
19870101
Document Type
IH; Information Circular;
Fiscal Year
1987
NTIS Accession No.
NTIS Price
Identifying No.
IC 9164
NIOSH Division
PRC;
Source Name
MISSING
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