Boring or penetrating the earth – With expansible bore wall anchor
Patent
1996-06-19
1998-06-02
Neuder, William P.
Boring or penetrating the earth
With expansible bore wall anchor
175 76, E21B 706
Patent
active
057587329
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
When drilling holes with the aid of a diamond drill for instance, the requirement of enabling the drill to be guided in a given specific direction has progressively increased. A diamond drill hole can be relatively long, more than 500 m in depth. It is difficult to know the precise location of the drill and what is happening. The problem resides in dosing the hole.
It is desirable that drilling can continue in one single stage until the lowermost drill tube, i.e. the tube to which the diamond drill is attached, is filled with a core of drill cuttings and must therefore be lifted from the hole and emptied. With earlier known drill arrangements it has been necessary to perform such drilling operations in several stages, while moving stepwise a so-called drill hole packer which is seated around the lower part of the drill tube and which functions as a guide means. One such arrangement is described in WO90/00666. The drill hole itself is used as a locking means in this case. The drill hole packer is clamped against the wall of the drill hole with the aid of the overpressure that is generated by the drilling liquid during each drilling interval. The drill is only able to penetrate through a relatively short distance, i.e. about 15 cm, before it is necessary to interrupt the drilling interval, wherewith the pressure is reduced so as to loosen the tension on the packer and therewith enable the central element to be moved downwards, whereafter a further drilling interval can be carried out, and so on. Thus, it is necessary to perform a plurality of such drilling intervals before the drill core is filled and must be taken up and emptied.
A drill pipe having a self-centering stabilizer is described in SE-8005248-3. The stabilizer includes a cylindrical sleeve which is provided with a ring of pads which project out against the wall of the drill hole so as to prevent the sleeve from rotating. The pads have a rounded outer surface so as to adapt to the curvature of the hole, and have a soft construction so as to prevent the loss of torque as a result of the braking action generated by the pads. The pads also extend along the full length of the stabilizer. Two stabilizers can be used however. The problem with these stabilizers is that they cannot be held stable in the hole because of the roundness. Although the pads may be provided with cemented carbide or diamond studs, these studs do not project outwards and are provided only to protect the pads themselves from wear.
OBJECTS OF THE INVENTION
One object of the invention is to provide a guide arrangement which will enable drilling to be effected continuously with the drill aligned in the drill hole, with the hole in the rock forming an arrangement guide sleeve, until the drill core is filled and must be taken up. Such a drill core may have a length in excess of 3 m. It must be possible to move the sleeve axially and to prevent the sleeve from rotating and hold the sleeve in line with the drill hole.
Another object of the invention is to provide a guide arrangement which will enable the drill core to be taken up and emptied without needing to take up the tool, i.e. the guide arrangement. This avoids the necessity of performing a new aligning operation when drilling is continued.
The aforesaid main objects of the invention are achieved with a guide arrangement having the characteristic features set forth in claim 1. Further solutions to the objects of the invention and further characteristics thereof are set forth in the remaining claims.
SUMMARY OF THE INVENTION
According to the present invention the guide sleeve uses the drill hole itself as a guide cylinder. The guide sleeve functions as a combined guiding and holding device.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the accompanying drawings, in which
FIG. 1 is an overview of the lower end of a diamond drill tube with associated guide arrangement;
FIG. 2 is a perspective view of one embodiment of an inventive guide arran
REFERENCES:
patent: 3180436 (1965-04-01), Kellner et al.
patent: 3974886 (1976-08-01), Blake, Jr.
patent: 5186264 (1993-02-01), du Chaffaut
LandOfFree
Control device for drilling a bore hole does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control device for drilling a bore hole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control device for drilling a bore hole will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1450731