Boring or penetrating the earth – Natural vibration characteristic of an element of boring...
Patent
1990-11-30
1992-08-25
Bui, Thuy M.
Boring or penetrating the earth
Natural vibration characteristic of an element of boring...
73 39, 175 40, E21B 4700
Patent
active
051410613
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns auditory and/or visual-display equipment of the drilling mechanics and its application in a drilling control method.
The French patent 1 587 350 discloses a procedure for measuring mechanical properties of rocks during drilling and equipment implementing said procedure.
Such a procedure allows ascertaining the lithologic properties of the rocks acted on by the drilling tool in that an accelerometer measures the rotational speed of the drill rod and in that deformation sensors determine signals corresponding to the vibration stresses applied to the rod. By analyzing these signals in analogue circuits a signal is obtained whereby this procedure reveals the lithologic properties of the rocks engaged by the tool.
It is further known from the application of an addition certificate 96 617 relating to the patent 1 590 327 how to measure rock lithologic properties during drilling, namely by selecting the components of a signal from a pressure pickup for the mud-column pressure and by selecting this signal in a frequency band centered on a frequency equal to the product of the tool rotation and the characteristic numbers of active tool elements.
However such equipment does not reveal information concerning the drilling status.
A first object of the invention is to propose equipment which after signal processing allows inferring information on such phenomena as the acceleration of the bit base or its jamming and then relaxation of the bit adhesion to the wall or lastly the failure to resume by the bit base.
This objective is achieved in that the auditory and/or visual-display equipment of the interaction mechanics between a drilling bit and the drilled rock comprises means in the form of an accelerometer to pick up at a specific point on the drilling stem a vibratory signal reflecting the tool vibration at its cutting surface and a signal filter in the frequency band of 10 to 200 Hz.
In another feature of the invention, the filtered signal is fed to an audio amplifier linked to a headphone.
In another feature of the invention, the filtered signal is transmitted to an electroluminescent-diode display of the bar-graph type.
In another feature of the invention, the filter or filter system consists of identical, second order high-pass, active filter selectively put in series with identical, second order low-pass active filters so as to provide the cutoff frequencies of the frequency band.
In another feature of the invention, the frequency band is 20 to 200 Hz for a bottom motor.
In another feature of the invention, the frequency band is 10 to 100 Hz for a surface motor.
Another object of the invention is simple equipment, easily moved and practical for a drilling site.
This objective is achieved in that the equipment comprises its own battery power supply for the pickup and the processing circuits.
A last object of the invention is equipment application in controlled drilling.
This objective is achieved in that the implementation consists in the following:
Filtering the accelerometer signal to preserve the spectrum in the 10 to 200 Hz frequency band,
Listening to or displaying this filtered signal to deduce information on drilling control,
Taking any necessary corrective steps on the basis of the information secured in the previous stage.
Other features and advantages of the present invention shall be elucidated below in the description in relation to the attached drawings:
FIG. 1 is an overall schematic of the equipment mounted on drilling gear,
FIG. 2 is the block diagram of the electronic pre-amplifier,
FIG. 3 is the circuit diagram of the invention's filtering system,
FIG. 4 is a front view of the equipment of the invention.
In FIG. 1, reference 1 denotes a drilling rig, 2 the upper part of this rig bearing the stationary pulleys 3. This set of pulleys 3 is linked by a set of cables 4 to the block bearing the movable pulleys 5. A hook 6 is affixed to the block 5 bearing the pulleys and supports an injection head 7. The upper part of this injection head 7 is stationary whereas the lower
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Bui Thuy M.
Societe Nationale Elf Aquitaine (Production)
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