(51) Int. Cl.3:
E 21 B, 7/04
E
21 C, 9/00
(19) Federal
Republic of Germany
[emblem]
German
Patent Office
(12) Offenlegungsschrift
[Published
Patent Application]
(11) DE
30 00 239 A1
(21) Application number: P 30 00 239.2-24
(22) Filing date: January 5, 1980
(43) Disclosure date: July 16, 1981
(71) Applicant: Bergwerksverband
GmbH, 4300 Essen, DE
(61) Supplement to: P 30 46 122.4
(72) Inventors: Wallussek,
Heinz, 5804 Herdecke, DE;
Wiebe,
Martin, 4320 Hattlingen, DE;
Röder,
Thomas, 4690 Herne, DE
Request for an examination has been filed, pursuant to §
44 of the Patent Act.
(54) Device for Boring Target Directed
Boreholes
DE 30 00 239 A1
ORIGINAL
INSPECTED
Federal
Government Printing Office of Berlin 05.81 130 029/40 6/60
Device for Boring Target Directed
Boreholes
Patent Claims:
1. Device, which is intended for boring
target directed boreholes, in particular drill holes in coal mining, and which
consists of a directional drill pipe, which is disposed behind the drill bit in
the drill pipe string, characterized in that the directional drill pipe
(1) exhibits an internal, rotatably mounted section (3) and an external,
stationary section (4), whereby the electric inclinometers (14) and the
adjustable, swivellably mounted control bars (9) are disposed on or in the
external stationary section.
2. Device, as claimed in claim 1, characterized
in that the control bars (9) are mounted on the head (2) of the directional
drill pipe (1) and can be swung out by means of hydraulically drivable
cylinders (10, 11), which are arranged in the upper section (6) of the
directional drill pipe.
3. Device, as claimed in claim 1 and claim
2, characterized in that the inclinometers (14) are assigned solenoid
valves (16, 17) that regulate the supply of the cylinders (10, 11).
4. Device, as claimed in claim 1 and claim
2, characterized in that the inclinometers (14) are arranged cross-wise.
5. Device, as claimed in claim 1, characterized
in that an eccentric is mounted on the rotatably mounted section (3) of the
directional drill pipe (1).
6. Device, as claimed in claim 1, characterized
in that pressure-limited hydraulic accumulators (20) are connected between
the pressure generator (19) and the cylinder (10, 11).
7. Device, as claimed in claim 1, characterized
in that the external, stationary section (4) of the directional drill pipe
(1) exhibits a dynamo, which can be driven by means of the rotatably mounted
section (3) and supplies power to the batteries, which are housed in the
directional drill pipe.
Device
for Boring Target Directed Boreholes
The
invention relates to a device, which is intended for boring target directed
boreholes, in particular drill holes in coal mining, and which consists of a
directional drill pipe, which is disposed behind the drill bit in the drill
pipe string.
Such
devices are used to advance the boreholes as close as possible to the
predetermined target. Such target directed boreholes are very important for
exploratory work, supply and service or rescue boreholes.
It is
known to dispose a rigid directional drill pipe behind the drill bit in order
to stabilize the drill pipe string. These directional drill pipes can only
stabilize the drill pipe string, but cannot prevent the borehole from slanting.
In particular, such directional drill pipes do not allow a correction of the
variation from the predetermined drilling direction that gradually develops in
the course of the drilling operation. It is especially disadvantageous that the
deviation that occurs during the drilling operation cannot be determined with
accuracy until the target location has been reached. Moreover, attempts have
been made to employ more or less automatically operating directional drill
pipes by means of a pendulum control unit.
Any
adjustment errors or system failures in the relatively expensive control unit
can result in deviations that can be determined only at the target location or
after completion of the borehole. The cause of such faulty drilling can also be
the inertia range that exists in the system of the pendulum control unit.
The
invention is based on the problem of providing a device, by means of which the
course of the drill hole can be both checked and corrected.
The
invention solves this problem, in that the directional drill pipe exhibits an
internal, rotatably mounted section and an external, stationary section. In
this case electric inclinometers and the adjustable, swivellably mounted
control bars are disposed on or in the external stationary section.
A
directional drill pipe that is equipped in such a way allows a continuous
checking of the course of the borehole by means of the electric inclinometers
and allows a corresponding correction by means of the control bars, which can
be slid out of the external stationary section. In so doing, it is possible to
report the deviation, indicated by the electric inclinometer, over the
measurement cables in the drill pipes as far as to the operator's control
station, where an evaluation takes place; and from where corresponding
counter-measures are initiated and/or the corresponding control bars are
activated.
The
checking and controlling is carried out section by section preferably during
the breaks in the drilling operation, because in this period of time jolts and
any other error sources are eliminated, but the measurement and control can
also be carried out during the drilling operation.
It is
practical to counteract a variation in the borehole with the aid of a
directional drill pipe that is equipped in such a way that the control bars are
mounted on the head of the directional drill pipe and can be swung out by means
of hydraulically drivable cylinders, which are arranged in the upper section of
the directional drill pipe. In this way the requisite corrections can be
carried out with minimum cylinder movements. In particular, the corrections can
be carried out by sliding out the control bars in the same way as the umbrella
rods in an umbrella. At the same time such a displacement and arrangement of
the control bars guarantees maximum protection for the parts that are required
for the control unit.
One
embodiment of the invention provides that the inclinometers are assigned
solenoid valves that regulate the supply of the cylinders. In this context the
solenoid valves are adjusted in such a way that they activate the externally
mounted control bars as a function of the inclinometer data.
In order
to check and avoid erroneous measurements it is practical to arrange the
inclinometers cross-wise. Then the erroneous measurements can be easily
ascertained from the operator's control station and eliminated by a correcting
intervention.
The
necessary operating pressure for the hydraulic control unit is generated
preferably in the directional drill pipe itself. For this purpose the invention
provides that the rotatably mounted section of the directional drill pipe
exhibits an eccentric, by means of which the necessary operating pressure can
be generated. As a result, the pressure-limited hydraulic accumulators, which
are connected between the pressure generator and the cylinder, make it possible
to activate the cylinders even during the breaks in the drilling operation.
The power
for the electric inclinometers and the solenoid valve control unit is supplied
selectively via rotary transformers over a cable reservoir, which is carried
along, or over hardwired conductors in the pipe casings with contact rings in
the pipe couplings or via transmission of the measured values and control
commands according to the telemetric method or also in an especially expedient
way by means of a dynamo. To this end it is provided that the external,
stationary section of the directional drill pipe exhibits such a dynamo, which
can be driven by means of the rotatably mounted section and supplies power to
the batteries, which are housed in the directional drill pipe.
One
important advantage of the invention lies in the fact that the faulty run of a
borehole can be easily determined by checking measures, which can be repeated
as often as desired, and can be eliminated by means of the corresponding
corrective measures. As a result, the additional costs, which are often
considerable, and the drilling time, associated with the faulty run of a
borehole, are avoided.
The
technological progress of the invention lies especially in the possibility of
making an automatic correction with such a directional drill pipe in the event
of a deviation from the predetermined drilling direction while at the same time
the course of the drilling operation can be checked from the operator's control
station. Furthermore, the technological advancement also lies in the ability to
operate the measurement and control members in the drill pipe without an
additional supply of energy.
One
embodiment of the invention is depicted in the drawing and is explained in
detail below.
Figure 1 depicts the inventive directional drill pipe, to some
degree from a cross sectional view.
The
drawing in Figure 1 that is largely a schematic drawing shows that the
directional drill pipe 1, which is installed in the drill pipe string, consists
in essence of the internal, rotatably mounted section 3 and the external
stationary section 4. The fluid passage 22 runs down the middle in the
directional drill pipe 1. Said fluid passage supplies the drill bit (not
illustrated) with drilling fluid.
On the
head 2 of the directional drill pipe 1, the control bars 9 are connected by
means of holders 8 to the stationary section 4 of the directional drill pipe 1.
These control bars 9 can be driven by means of the cylinders 10, 11, which are
mounted in the upper section 6 of the directional drill pipe 1,
so that,
when said control bars are suitably driven, they issue from the stationary
section 4 in the upper section 7 of the directional drill pipe 1. Their movement
is made uniform by means of the travel limiters 12. In this case the springs
13, which are assigned to the travel limiters 12, make sure at the same time
that the control bars 9 are moved back into their starting position, when the
cylinders are in a depressurized state.
The
cylinders 10, 11 are regulated by the solenoid valves 16, 17, which in turn are
controlled by the inclinometers 14. The inclinometers 14 in turn are connected
in such a manner that their determined deviations are reported simultaneously
over the measurement cables or by a different method to the operator's control
station.
The
necessary operating pressure for the hydraulic control unit is generated by the
rotating section of the directional drill pipe 1 and/or by the assigned
eccentric 23. The installed, pressure-limited hydraulic accumulators 20 make it
possible to operate the cylinders 10, 11 during the breaks in the drilling
operation. At the same time the required fluid is taken from the tank 18 by
means of the pressure generator 19.
In the
illustrated example, the power for the electric inclinometers 14 and the
solenoid valves 16, 17 is supplied by the cable, which is used simultaneously
as the measurement and control cable 15, or according to a different method.
It is also
possible to couple the inclinometers directly to the respective control
cylinders. In this case, however, the visual inspection cannot be carried out
from the operator's control station without any additional cost.
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Blank Sheet -
key to
Figure
Number: 30 00 239
Int. Cl.3: E 21 B 7/04
Application
date: January 5, 1980
Disclosure
date: July 16, 1981