Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Sectional guide or shaft having means to lock sections in...
Patent
1992-05-26
1995-09-26
Schoeppel, Roger J.
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
Sectional guide or shaft having means to lock sections in...
175101, 175107, E21B 708
Patent
active
054527724
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for directing and steering the foremost part of a drillstring for earth drillings.
Such an apparatus is known.
When, by an embodiment of the known apparatus, one has to drill further to create a side branch starting from a vertical bore, the drillstring is first retrieved from the borehole, a wedge shaped guiding piece is next let down into the borehole, and subsequently the drillstring is again lowered in the borehole. The wedge shaped guiding piece deviates the foremost part of the drillstring sidewards, so that the borehole is drilled in a more horizontal direction, to form the required side track.
With another embodiment of the known apparatus for the forming of a side branch starting from the vertical bore, the bottom end of the drillstring includes a bend piece which carries the bit and a drilling motor. To form the side branch, the bit is driven by the drilling motor and non rotating drillstring, and consequently is drilled ahead sidewards to form the required side track.
Another embodiment of the known apparatus for yielding a sideward deviation from the vertical borehole comprises one or more stabilizers for deviating the foremost part of the drillstring.
All these embodiments of the known apparatus require, for the incorporation of the wedge shape guiding piece, or of the bend piece at the bottom end of the drillstring, or of the stabilizers, that the whole drillstring be retrieved from the borehole, and to subsequently lower down the tapered shaped guiding piece in the borehole, or to incorporate the bend piece or the stabilizers at or nearby the bottom end of the drillstring.
This repetitive retrieving of the drillstring out of the borehole, to make the necessary arrangements for further sidewards drilling starting from the vertical borehole, is very time consuming and costly.
The invention intends to eliminate these disadvantages of the known apparatus or apparatuses.
SUMMARY OF THE INVENTION
The apparatus, according to the invention, includes a housing having a piston, which is displacable between two or more positions by the massflow of the drilling fluid through the drillstring. The piston is connected with at least one adjusting organ, which co-operates with devices for directing and guiding of the end of the drillstring.
By the steering of the piston with the massflow of the drilling fluid through the drillstring, the guiding devices at the end of the drillstring can be controlled from the earth surface. Thus, when drilling the side branch starting from the vertical first bore, it is no longer necessary to retrieve the total drillstring repetitively from the borehole. The housing in which the piston is incorporated can adequately be part of the drillstring.
By an embodiment of the apparatus in accordance with the invention, the devices for the directing and guiding of the bottom end of the drillstring comprise one or more stabilizer blades. These stabilizer blades can be steered by the piston by the massflow of the drilling fluid.
By another embodiment of the apparatus in accordance with the invention, the devices comprise two, hinged interconnecting housing parts. The piston is incorporated in one housing part. The adjusting organ connected to the piston cooperates with an adjusting organ solidly connected to the other housing part. By displacing one adjusting organ with respect to the other adjusting organ, the position of the housing parts with respect to each other is changed.
In one of the housing parts the bit bearing is accommodated, and in the other housing part a drive motor for the bit is accommodated.
In another embodiment of the invention apparatus, the devices comprise at least one bearing of a bit. This bearing is displacable transverse to the housing under steering of the adjusting organ and the piston connected thereto. By the displacement of the bearing from the centerline of the housing, the shaft of the bit is deviated by an angle from the center line. The piston is displacable against a spring force
REFERENCES:
patent: 4754821 (1988-07-01), Sweitlik
patent: 4811798 (1989-03-01), Falgout et al.
patent: 4844178 (1989-07-01), Cendre et al.
patent: 4848490 (1989-07-01), Anderson
patent: 5012877 (1991-05-01), Winters et al.
patent: 5220963 (1993-06-01), Patton
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