Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Axially spaced opposed bore wall engaging guides
Patent
1995-06-22
1996-12-10
Tsay, Frank
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
Axially spaced opposed bore wall engaging guides
1753251, E21B 706
Patent
active
055822606
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a control structure for at least two stabilizing arms in a drill or core device, in particular stabilizing arms in a drill or core bit, each arm being shifted with respect to the other over the circumference of the bit and having an extremity which is pivoted around an axis parallel to the axis of the drill bit in such a manner that the free extremity of the arm is behind said pivot axis with respect to the rotation direction of the bit during drilling.
DESCRIPTION OF THE PRIOR ART
The use of stabilizers having several stabilizing arms actuated by the drill fluid is common in the art. However, improvements are necessary for example in order to make the control structure of the arms more compact when it has to be integrated in a drill or core bit, and in order to reduce the number of mechanical components used in this control structure in order to reduce its cost and to increase its reliability.
SUMMARY OF THE INVENTION
To this end, the control structure according to the invention comprises, per arm, a piston provided for pivoting the arm around said axis so that the free extremity of the arm takes in two extreme positions, a first so-called rest position wherein the arm is housed in the bit and a second so-called operative position wherein said free extremity projects with respect to said bit. The control structure and a synchronization means are provided respectively for displacing the pistons under the pressure of the drill fluid and for making the pistons act substantially simultaneously in the same direction and to the same amplitude.
A separate control for each arm permits a reduction in the dimensions of the piston this so that this piston may be housed in the drill bit and may be connected directly to the concerned arm.
According to an advantageous embodiment of the invention, the longitudinal axes of the pistons are tangential to an imaginary cylinder coaxial to the bit, and preferably comprised in at least one plane transverse to the axis of the drill bit.
According to a particularly advantageous embodiment of the invention, the means for controlling the pistons comprise an annular piston which is coaxial to the bit. The annular piston is axially in a cylinder formed in the bit. The annular cylinder is shaped for being actuated by the drill fluid. Actuation of the annular cylinder acts on a control fluid which actuates each of said pistons and which is contained in the cylinder in communication with the chambers of the pistons.
In this way, the drill fluid comes only in contact with a minimum of elements composing the control structure which reduces or excludes the risk for clogging and wearing the control by materials composing this drill fluid or carried along by this fluid.
Other details and particularities of the invention will become apparent from the description of the drawings which are annexed to the present text and which illustrate, as a non limitative example, a particular embodiment of the control according to the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows, with breaks, a longitudinal section according to broken line I--I in FIG. 2 of a drill bit equipped with the arm control structure according to the invention.
FIG. 2 is on a larger scale a transverse section according to line II--II of the control structure of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the different figures, the same reference numerals indicate identical or analogous elements.
The figures illustrate a control 1 of three stabilizing arms 2 disposed by means of example in a drill bit 3. For the simplicity of the graphical representation, the three arms 2 which are regularly distributed over a circumference of the bit 3 are situated on the same level of this bit with respect to the forward extremity of the bit 3 according to its progression into a hole during the drilling. The skilled man can easily conceive other distributions of the arms 2 as well over the circumference of the bit 3 as along the longitudinal axis 4 of this
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patent: 5181576 (1993-01-01), Askew et al.
patent: 5186264 (1993-02-01), du Chaffaut
patent: 5265684 (1993-11-01), Rosenhauch
patent: 5311953 (1994-05-01), Walker
Deschutter Rene L.
Murer Mario V.
Baroid Technology Inc.
Tsay Frank
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