Classifications

• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B7/00—Special methods or apparatus for drilling
  • E21B7/14—Drilling by use of heat, e.g. flame drilling
  • E21B7/15—Drilling by use of heat, e.g. flame drilling of electrically generated heat
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B10/00—Drill bits
  • E21B10/02—Core bits
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
  • E21B25/10—Formed core retaining or severing means

Definitions

• the invention relates to a drilling device for drilling rock, in particular hard rock, with a drill pipe and at least one first electrode and at least one second electrode, between which an electrical voltage can be generated, which can be ablated by voltage discharge between the electrodes rock material, according to the preamble of the claim 1.
• the invention further relates to a method for drilling rock, in particular hard rock, with a drill pipe, which has at least one first electrode and at least one second electrode, between which an electrical voltage is built up, wherein by voltage discharge between the first electrode and the second electrode rock material for producing the bore is removed, according to the preamble of claim 10.
• a generic drilling method which is also referred to as Elektroimpulsbohren, for example, from the DE 20 2006 018 980 U1 out.
• a central electrode is formed around which a plurality of further electrodes is arranged in a ring.
• a voltage can be built up, so that rock material on a circular disk-shaped working face over the entire surface can be removed.
• the electrodes contact the rock, they do not have to transmit any large mechanical forces.
• the Elektroimpulsbohren is thus relatively low-wear, but requires a large amount of electrical energy.
• drilling devices for Elektroimpulsbohren with a central electrode are, for example, from the US 3,881,559 B , of the US 2,822,148 B or the US 2,308,860 B known. From the DE 10 2011 100 358 A1 Furthermore, a drilling device with a curved casing out, through which initially a drill head for an electric pulse method can be introduced horizontally.
• drill heads For drilling hard rock, it is also known to use drill heads, in which fuel gases are passed into the region of the working face. In the case of hard rock, due to thermal stresses, rock material can be loosened and a borehole can be created. Such a drilling method is for example from the US 2011/0198123 A1 out. The delivery of a fuel gas into a borehole is expensive in terms of design, operation and maintenance.
• the invention has for its object to provide a drilling apparatus and a method for drilling, with which a well can be created efficiently especially in hard rock.
• the drilling device is characterized in that a plurality of first electrodes and a plurality of second electrodes are arranged in pairs to each other and that the plurality of electrode pairs of the first electrode and the second electrode are arranged annularly along a lower edge of the drill pipe.
• a basic idea of the invention can be seen in the use of an electric impulse method for creating a borehole, wherein, however, a rock excavation is not provided completely over the entire boring cross section. Rather, according to the invention, the first electrodes and the second electrodes arranged in pairs along an annular edge of a drill pipe. Thus, so to speak, an annular borehole is created in which a corresponding core remains.
• the electrodes of a pair of electrodes have a different polarity.
• a particularly preferred embodiment of the invention is that the drill pipe has an inner receiving space for a drill core.
• the processed in the electric pulse process soil material can be dissipated in a known manner by the supply of a rinsing fluid from the working face and discharged to the outside of the borehole.
• the core can be removed with or through the drill pipe.
• At least one collecting device is provided for holding the drill core in the receiving space of the drill pipe.
• the collecting device may in particular comprise hooks or punches, which are preferably movable between a retraction position and a clamping position for holding the core.
• actuating cylinder in particular hydraulic actuating cylinder or mechanical clamping devices.
• the core can break off at a certain length / diameter ratio, for example of a critical length, which is 1 to 2 m or more, due to the forces acting in drilling operation on its own.
• a crushing device is provided for breaking the core of pending rock.
• the crushing device may comprise elements which selectively apply transverse forces transversely to the longitudinal direction of the drill core.
• a mechanical removal device may also be provided at a lower region of the drill pipe, with which the core is machined in its foot area. In this way, a targeted separation or break point can be generated on the core.
• the drill pipe can create a borehole in the ground solely by axial or vertical movement.
• the borehole may also have a deviating from a circular outer contour.
• a rotary drive is provided for rotationally driving the drill pipe.
• the rotary drive can be provided within the borehole or preferably outside the borehole on a carrier device.
• the drill pipe is rotatably driven to create the borehole, so that it can be worked on the drill pipe due to the continuous change in position with a small number of pairs of electrodes.
• mechanical removal tools can also be provided on the drill pipe.
• the drill pipe can be used on a conventional rotary drilling rig, which is equipped with additional components for electrical voltage generation.
• At least one electrical generator device is provided, which is designed to generate a high voltage electrical pulse between the electrodes of a pair of electrodes.
• the generator device is designed to generate an electrical pulse, which is preferably in a range between 100 kV to 1000 kV.
• the impact energy can be in the range of 100 joules.
• the surge can be generated with a duration of preferably less than 200 ns.
• a pulse repetition rate may preferably be between 10 Hz.
• the generator device comprises a so-called Marx generator, which is arranged within the drill pipe or outside the borehole on a carrier device. It may be provided a mode of operation with DC voltage and AC voltage. Depending on the operating mode, corresponding components may be provided, such as rectifiers, capacitors and / or transformers.
• a particularly efficient operation of the drilling apparatus is achieved according to an embodiment of the invention in that a control device is provided, which for targeted activation and power supply of the individual pairs of electrodes is trained.
• the electrode pairs can be driven simultaneously with energy for generating a plurality of high-voltage pulses.
• Such a differentiated control of the electrode pairs is particularly useful for the removal of the resulting rock material, which is preferably removed by a flushing medium from the wellbore.
• a discharge device for discharging the drill core from the receiving space of the drill pipe is arranged.
• a broken drill core can be removed from the wellbore by an internal lifting device within the drill pipe.
• the drill core it is also possible for the drill core to be held in the receiving space of the drill pipe, the drill pipe being pulled out of the drill hole for emptying the drill core and then being inserted again into the drill hole.
• the simplest arrangement variant of a pair of electrodes consists in that two individual electrodes of different polarity face each other, so that a removal flow can be generated between them.
• a preferred embodiment of the invention consists in that the first electrode and / or the second electrode of an electrode pair itself comprises a plurality of electrode elements.
• the first electrode may be a central electrode
• the second electrode has a plurality of electrode elements, which are arranged, for example, in a ring around the central electrode.
• a pair of electrodes may be considered, so to speak, as an electrode removal unit having any electrode or electrode element configuration.
• the electrode removal units are preferably arranged distributed along the lower edge of a drill pipe.
• the object mentioned in the introduction is achieved in that a plurality of first electrodes and a plurality of second electrodes are arranged in pairs and annularly along a lower edge of the drill pipe, wherein an annular borehole is produced with a drill core.
• the method according to the invention can preferably be carried out with the drilling device described above. With the method according to the invention, the advantages described above can be achieved.
• a preferred embodiment of the method according to the invention is that the drill core is received in an inner receiving space of the drill pipe.
• the receiving space may be formed with a length of up to several meters.
• the core is broken and loosened in the receiving space of the upcoming rock.
• the release of the core can be effected solely by the forces occurring in drilling operation when the core has reached a certain length-diameter ratio.
• a release or breaking device can be provided, with which static and / or dynamic forces are preferably applied to them in the transverse direction to the longitudinal axis of the drill core.
• a cutting device on the drill pipe with which the drill core is at least partially cut in a foot region. In this way, a predetermined breaking point can be formed when transverse forces are applied to an upper end of the drill core.
• the broken core be held in the receiving space and / or discharged from the receiving space.
• a holding can take place via corresponding clamping or tensioning devices in the interior of the drill pipe.
• the drill core can be removed from the wellbore via a cable system within the drill pipe.
• the electrode pairs can be operated with any suitable voltage. According to a development of the invention, it is particularly preferred for an electrical high-voltage pulse to be generated between the first electrode and the second electrode of each electrode pair, through which the rock material is released. To form the high voltage pulse, a voltage of 10 kV and more may be provided.
• the individual pairs of electrodes are selectively activated and supplied with energy.
• a corresponding control device for generating and guiding the voltage pulse is provided.

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• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Mining & Mineral Resources (AREA)
• Physics & Mathematics (AREA)
• Environmental & Geological Engineering (AREA)
• Fluid Mechanics (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Mechanical Engineering (AREA)
• Earth Drilling (AREA)
• Drilling And Exploitation, And Mining Machines And Methods (AREA)

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Citations (10)

• 2016
  • 2016-11-23 EP EP16200188.7A patent/EP3327247A1/fr not_active Withdrawn

Patent Citations (10)

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