Boring or penetrating the earth – Processes
Patent
1996-10-15
1998-07-07
Dang, Hoang C.
Boring or penetrating the earth
Processes
175340, 175393, 175424, E21B 1018, E21B 1060
Patent
active
057754438
ABSTRACT:
A rotary drill bit (10) has a jet pump device including a plurality of jet pump assemblies (26). Each jet pump assembly (26) has an outer housing (28) secured to the bit body (14) and receiving any elongate nozzle member (46) therein in concentric relation to form an annular chamber (48) therein. A flow restriction (38) is mounted within the outer housing (28) above the nozzle member (46). The elongate nozzle member (46) has a lower nozzle port (50) and an opposed upper nozzle port (52). Drilling fluid from the central bore (20) is directed to the nozzle member (46) where the drilling fluid is divided into two streams, one stream for flow through lower nozzle port (50) against the formation and the outer stream for flow through the upper nozzle port (52) and flow restriction (38) to create a low pressure area or suction in an annular chamber (48). A low pressure cross sectional area is formed at the bottom of the bore hole (B, FIG. 4) and drilling fluid with entrained formation cuttings is drawn upwardly through the annular chamber (48) and the flow restriction (38).
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Dang Hoang C.
Nozzle Technology, Inc.
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