METHOD AND ASSEMBLY FOR ABRASIVE JET DRILLING

METHOD AND ASSEMBLY FOR ABRASIVE JET DRILLING

A method for operating an earth formation drilling device (1) arranged to supply a jet of abrasive fluid for the purpose of providing a borehole by removing earth formation material through abrasion, comprises a drill string and a drilling assembly connected to the drill string. Said drilling assemb...

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1. Verfasser: BLANGE, JAN-JETTE
Format: Patent
Sprache:eng ; fre
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EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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creator BLANGE, JAN-JETTE
description A method for operating an earth formation drilling device (1) arranged to supply a jet of abrasive fluid for the purpose of providing a borehole by removing earth formation material through abrasion, comprises a drill string and a drilling assembly connected to the drill string. Said drilling assembly comprises a jetting device with a mixing space (13), a drilling fluid, a particle inlet (12), an abrasive fluid outlet (40) for discharging a mixture of drilling fluid and magnetic particles, and a magnetic particle circulation system comprising a supporting surface which is exposed to a return stream along the drilling assembly. Furthermore, a magnetic device (9) is provided for attracting the magnetic particles onto the supporting. Said method is characterized buy the steps of : -fixing the magnetic device with respect to the supporting surface, -selecting a magnetic field density which increases along the sloping supporting surface towards, the entrance, -attracting magnetic particles onto the supporting surface under the influence of the fixed magnetic device, -making the magnetic particles move over the sloping supporting surface (under the influence of the magnetic field of the magnetic device.
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subjects EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
title METHOD AND ASSEMBLY FOR ABRASIVE JET DRILLING
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