Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1985-11-14
1987-11-10
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring with specific fluid
175 92, 175296, E21B 402, E21B 414
Patent
active
047051183
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an improved particle sampling apparatus and hammer drill for use in efficiently drilling a bore hole while continuously taking core samples.
The object of the invention is to drill a hole without the use of a conventional drilling rig and to provide a continuous flow of broken particulate material to the surface.
SUMMARY OF THE INVENTION
In accordance with the present invention, apparatus for drilling a bore hole comprises a hammer and a series of dual wall drill tubes, the hammer being supplied with compressed air and being for use in applying successive percussive blows to a percussive drill cutting bit for taking core samples from the bottom end of the bore hole while drilling same, first means for indexing rotationally the bit for drilling purposes, said means being operable by a portion of the supply of air, second means to conduct from the bottom end of the bore hole the portion of air used by and exhausted from the percussive cutting bit and having core particles entrained therein, and third means to assist in conveying said exhausted air and core particles to the surface for collection.
Preferably, an upstanding rig is provided at surface level to support the hammer and drill tubes and to transmit push-down or pull-up movement thereto.
Preferably also, the portion of air actuating the first means is the same as that portion of air sequentially causing the hammer to apply the percussive blows.
Preferably further, the third means comprises an annular flushing jet to direct a portion of air upwardly through a sampling tube co-axial with the drill tube and hammer to induce a venturi to assist in conducting core particle entrained exhaust air upwardly. The flow of air through the jet is continuous and uninterrupted while the flow of exhausted air is intermittent and pulsating.
BRIEF DESCRIPTION OF THE DRAWING
An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 shows a diagrammatic side elevation of an apparatus according to the present invention for use in drilling bore holes;
FIGS. 2 and 3 show, to a larger scale than FIG. 1, vertical cross-sectional views of a hammer and drill tubes;
FIG. 3 being an upright continuation of the view shown in FIG. 2;
FIG. 4 is an exploded view of a ratchet mechanism to a still larger scale;
FIG. 5 shows an exploded view of an alternative means of rotation for the cutting bit, the means incorporating a ratchet mechanism; and
FIG. 6 shows to a different scale a side elevation of alternative means of piston movement.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1 of the drawings, the apparatus comprises a rig 37 to be upstanding adjacent to where a bore hole is to be drilled. A drill tube head is carried on said rig 37 to be moved parallely of an upstand thereof by an arrangement of wire ropes 81 entrained around a set of pulleys 82, and the head 1 being moved by operation of extension or retraction of a hydraulically-operable ram 80. The drill head 1 supports a hammer 3 which is of a self-rotating sampling type and as the hammer 3 is progressed into the ground to form a bore hole, dual wall drill tubes 2 are added sequentially according to conventional practice to the hammer 3. The head 1 receives compressed air from a compressor (not shown) via a flexible hose 83. Thus air is fed therefrom to the cutting bit 27 of the hammer 3 to rotate same and drill the bore hole. Details of hammer 3 and the next adjacent drill tube 2 is shown in FIGS. 2 and 3 and will be described hereinunder in relation to the method of operation of the apparatus.
The method comprises the following sequence of events. High pressure compressed air (of the order of 100 psi or above), produced by the surface compressor, is channelled via the flexible hose 83 to the drill tube head 1. The high pressure compressed air then passes down the annular area within the dual wall drill tubes to enter the hammer. After passing through a shock absorb
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Bui Thuy M.
Novosad Stephen J.
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