Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent
1990-07-23
1993-02-09
Neuder, William P.
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by fluid pressure
175271, E21B 728
Patent
active
051846870
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to well-drilling technologies, and more particularly it relates to a well reamer.
The invention can be employed to the utmost effect in the patching-off of troublesome zones encountered in a drilling operation and associated with either intense losses of the drilling mud and cement slurry, or the inflow of a liquid or gas from an exposed formation into the borehole, or else caving-in of the rock being drilled into the borehole.
BACKGROUND OF THE INVENTION
It is not unfrequent in the process of drilling a deep well for oil or gas production to encounter formations incompatible from the drilling viewpoint, e.g. formations with abnormally high or low formation pressures, or else with crumbling or caving-in rock.
To provide for further drilling without reducing the predetermined diameter of the well, a portion of the borehole in the zone of the exposed troublesome formation is reamed, and a patcher is set into this reamed portion of the borehole, e.g. in the form of a string of profile pipes which are urged against the wall of the reamed portion of the borehole by building up excessive fluid pressure inside these pipes, followed by calibrating their internal flow passage to the required well diameter.
DESCRIPTION OF THE PRIOR ART
There is known a well or borehole reamer (SU, A, 874952) comprising a housing with a connection, a piston assembly, projectable supports with rock-breaking members, and a limiter of the projection of these supports.
There is further known a well or borehole reamer (U.S. Pat. No. 2,941,785) comprising a reducer or sub for its connection with the drive, a hollow housing with a central channel and radial openings in the side wall, projectable rolling cutters, mounted in the radial openings of the housing, and a mechanism for projecting the rolling cutters from the radial openings of the housing, including an annular piston and a locking member with an annular shoulder, mounted in the housing for limited axial reciprocation.
A major drawback of the known reamers in their having no provision for self-centering of the rock-breaking members (e.g. the rolling cutters) with respect to the borehole wall, whereby more often than not the surface of the reamed portion of the borehole becomes irregular or eccentric with respect to the well axis. This drawback threatens poor quality of the subsequent patching-off of the formation and complicates further drilling on account of the irregular diameter of the patching in the patching means, opposing normal running-in and pulling-out of the drilling tools.
Another shortcoming of the known reamers is their not being adapted for monitoring the operation of the reamer in the well by the drilling personnel, as the known reamers send out no signal of the rolling cutters having been projected into their working positions. This shortcoming also threatens poor quality of the reaming of the borehole or well.
It is an object of the present invention to enhance the performance reliability of a well reamer.
It is another object of the present invention to enhance the quality of the work of reaming the wall of a borehole or well.
SUMMARY OF THE INVENTION
It is the main object of the present invention to create a well reamer of a structure providing for full projection of the rolling cutters from the housing into their operating position, with simultaneous self-centering of the rolling cutters with respect to the wall of the borehole or well.
This object is attained in a well reamer comprising a sub for attaching it to the drive means, a hollow housing with a central channel and radial openings made through its side wall, projectable rolling cutters, mounted in the radial openings of the housing, and a mechanism for projecting the rolling cutters from the radial openings of the housing, including an annular piston and a member for locking the rolling cutters. In accordance with the present invention, the piston is connected with the housing for joint rotation therewith and is rigidly connected with the sub
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Abdrakhmanov Gabdrashit S.
Akhunov Albert M.
Akhunov, administrator by Farid A.
Akhunova, administrator by Tanzilya K.
Akhunova,administrator by Flera A.
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