Boring or penetrating the earth – With magazine for successively moving unconnected – oriented...
Patent
1998-01-12
1999-12-07
Schoeppel, Roger
Boring or penetrating the earth
With magazine for successively moving unconnected, oriented...
175 85, 175113, E21B 1920
Patent
active
059967102
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a drilling device of the type used for drilling in rock or earth layers or similar. More specifically the invention relates to a drilling device which is suitable for drilling with long drill strings comprising a large number of drill string elements which may have somewhat different lengths.
In prior art drilling devices, e.g. for exploration drilling, of the kind which the present invention aims at improving it is important for achieving good efficiency in the handling of the drill string to have two operators, one who handles the drilling machine and one who handles the drill string elements. In exploration drilling this handling is very time-consuming since one takes up drill samples every third meter or so and the drill string comprises several hundred drill string elements.
SUMMARY OF THE INVENTION
The present invention which is defined in the subsequent claims aims at achieving a drilling device where drilling and handling of the drill string efficiently can be handled by one operator independent of variations in tube length drill string weight drilling direction and starting position. In particular, the invention makes it possible to automatically make and break joints between drill string elements having even surfaces and substantially constant diameters.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention is described below with reference to the accompanying drawing in which
FIG. 1 shows a side view of a drilling device according to the invention.
FIG. 2 shows a part of the drilling device in FIG. 1 on a larger scale.
DESCRIPTION OF THE BEST MODE FOR CARRYING OUT THE INVENTION
The drilling device shown in the drawing comprises a frame 1 on which a feed device 2 is arranged. The frame can be in the form of a sleigh as shown in FIG. 1 or a vehicle or some other arrangement carrying the feed device in a stable manner. The feed device 2 comprises in the shown example two sprockets 11, 12 and a chain 13 which passes over the sprockets and is connected with a drilling device 3. The teed device can be made in in arbitrary wax which allows displacement of the drilling unit 3 to-and-fro along the feed device. The drilling device 3 comprises a rotation motor 14 which via a gear box 15 rotates a chuck 16. The drilling device has a through passage for a drill string 4.
The chuck 16 comprises gripping means which can be brought into contact the drill string for rotation of the drill string. The chuck is arranged for gripping or releasing the drill string 4 under fluid pressure control. A holder 5 for the drill string 4 is arranged at the lower and of the feed device 2. Cooperation between the chuck 16, the holder 5, the feed device 2 and the drilling device 3 can be as described in U.S. Pat. No. 3,613,804. The holder 5 comprises gripping means for gripping or releasing the drill string under fluid pressure control. One important aspect of the present invention is the possibility of automatically making or breaking the joints between two drill string elements 8. This is done through gripping the drill string 4 with both the chuck 16 and the holder 5 and rotating the chuck in either direction depending on what is desired. In this respect it is important that the drilling device is movable along the feed device to make it possible to apply torque to the drill string. With the present invention this can be obtained with drill string elements having an even surface and substantially constant outer diameter.
The drilling device 3 is provided with means 6 for the sensing of an end 7 of a drill string element 8 being a part of the drill string 4. In the shown example one uses an infra-red light source and a sensor for infra-red light. One can also use other means, e.g. mechanical sensing. The feed device 2 furthermore comprises a meter 22 for measuring the position of the drilling device 3 along the feed device. The drilling device 3 is provided with speed counter 23 for indication of the rotational speed of the drilling device and th
REFERENCES:
patent: 4042123 (1977-08-01), Sheldon et al.
patent: 4187546 (1980-02-01), Heffernan et al.
Jansson Kjell
Oden Erik
Atlas Copco Craelius AB
Schoeppel Roger
Stone Mark P.
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