Wells – Detents or clutches – Lug in closed branched slot
Patent
1998-08-19
2000-07-04
Schoeppel, Roger
Wells
Detents or clutches
Lug in closed branched slot
1662427, 175 73, 175106, 175195, 175319, 175323, E21B 2300
Patent
active
060824530
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims priority to PCT Application No. PCT/NO97/00034 filed Feb. 5, 1997 which claims priority from Norwegian Patent Application NO. 960641 filed Feb. 19, 1996.
The invention relates to an orientation device, particularly for a drilling tool or a well equipment in oil or gas wells, of the kind comprising a first sleeve and an axially displaceable carrier, e.g. in the form of a wedge or a rail adapted to slide in an inclined, preferably helical groove formed in first sleeve, the groove direction crossing the direction of the rectilinear movement of the carrier, said movement, thus, being converted into a rotational movement of first sleeve.
During the drilling of oil and gas wells, a bent transition piece is often used, in English designated "bent sub", between the bit and the drill string, in order to achieve a directional deviation between the axis of the drill string and the axis of the bit. Upon rotation of the bent transition piece or sub, the bit may be brought to point in the direction in which one desires to drill.
It has been found difficult to make the bit pointing in the desired direction through a rotation of the drill string and, when using coilable tubing, it is not possible to orientate the bit in that way. Therefore, it is usual to dispose a downhole orientation device which is guided and controlled from the surface, in order to rotate the bent transition piece or sub and to bring the bit to point in the desired direction.
There exists a plurality of various types of devices for this purpose. A common feature of these known devices is the conversion of a rectilinear movement into a rotational movement. This is appropriate because of the ease to convert the hydraulic force available through drill fluid into a controlled rectilinear movement by displacing a hydraulic piston.
U.S. Pat. No. 4,286,676 deals with a tool for use with directional drilling, wherein a carrier is adapted to slide in a groove, in order to create rotation of a sleeve.
Another usual way of converting a rectilinear movement into a rotational movement is to use some form of screw-nut combination, frequently disposed such that a carrier in the form of a wedge or a wedge-like means slides in a helical groove.
In order to convert a linear movement into a rotational movement by leans of a helical thread, the pitch of the helical thread must be so great that self-bloc ing or self-locking is avoided. The limit value of the pitch for self-blocking depends on the friction. In practice, it has been found that the requirement for torsional moment is the dimensioning factor in these cases. In order to obtain a sufficient torsional moment, the pitch of the helical thread must also be large.
However, a large pitch angle causes that the rectilinear movement needed in order to achieve a given rotational angle, becomes longer. Known orientation devices are unappropriately long, shorter constructional measures being desired.
The object of the invention is to provide an orientation device having a substantially shorter constructional length than prior art tools.
The object is achieved through features as defined in the following claims.
In the following, the invention is described by means of two exemplary embodiments, reference beign made to attached drawings, wherein:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a cross-section of a simplified orientation device;
FIG. 2 shows, partly in section, partly in side elevational view, the same simplified orientation device as in FIG. 1;
FIG. 3 shows a sketch of principle of the orientation device's turn-mechanism for three rotational positions;
FIG. 4 shows in a side elevational view a sketch of principle of a wedge meshing with two crossing grooves;
FIG. 5 shows in a top plan view the same wedge as in FIG. 4;
FIG. 6 shows in a side elevational view, partly in section, a turn-mechanism in an orientation device;
FIGS. 7 and 8 show in sectional views the upper and lower half, respectively, of an orientation device.
In FIG. 1, the refere
REFERENCES:
patent: 3405771 (1968-10-01), Carr et al.
patent: 4286676 (1981-09-01), Nguyen et al.
patent: 4596294 (1986-06-01), Russell
patent: 5305837 (1994-04-01), Johns et al.
patent: 5322136 (1994-06-01), Bui et al.
Bakke Oil Tools AS
Schoeppel Roger
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