Assembly for drilling and logging, method for drilling and logging and device for electro pulse drilling

1. An assembly for drilling and logging, comprising:

a device for electro pulse drilling (EPD device) configured to generate acoustic signals and electromagnetic signals;

at least one device configured to receive the acoustic signals generated by drilling using the EPD device; and

at least one device configured to receive the electromagnetic signals generated by the drilling using the EPD device, and further configured to receive electromagnetic and seismic waves from electrode discharge and plasma formation.

2. An assembly according to claim 1 ,

further comprising acoustic receivers configured to measure three displacement vectors and one pressure component, the receivers being configured to be arranged in one or more positions chosen amongst: on a seabed, on a ground surface, in water above the seabed, in one or more separate well-bores, in the well-bore where the EPD device is used.

3. An assembly according to claim 1 ,

further comprising electromagnetic receivers, configured to be arranged in one or more positions chosen amongst: on a seabed, on a ground surface, in water above the seabed, in one or more separate well-bores, in the well-bore where the EPD device is used.

4. An assembly according to claim 1 ,

further comprising silver-silver-chloride dipole electrodes and coils with ferromagnetic core configured to measure electric and magnetic signals respectively, on the surface or a seabed.

5. An assembly according to claim 1 ,

further comprising loop antennas configured to measure electromagnetic signals in a well-bore.

6. An assembly according to claim 1 ,

further comprising a device coupled to the receivers for recording, storing and processing of the data from the receivers, coupled to the EPD device or readable for an operator for the EPD device, for control of the electro pulse drilling based on the measures and/or processed data, either manually or automatically.

7. An assembly according to claim 1 ,

wherein the EPD device includes electrodes configured to be arranged so as to be capable of being coupled to an effect adjustable high-voltage supply to provide an adjustable charge voltage for subsequent discharge via the electrodes, so that plasma formation can thereby be provided selectably either in a drilling fluid ahead of a drilling bit, or into or onto a formation face ahead of the drilling bit.

8. An assembly according to claim 1 ,

wherein the device for electro pulse drilling includes at least three electrodes for charging to a high-voltage (charging electrodes) and subsequent discharging, arranged angularly separate within a circumference, and with at least one electrode coupled to ground, the electrodes being configured to be arranged in a drilling face of a drill-bit, with insulation between the electrodes, with individually switch-able coupling of the charging electrodes to an effect-adjustable electric high-voltage supply.

9. A method for electro pulse drilling and logging, comprising:

bringing a device for electro pulse drilling into a well-bore, in at least one of an end of a drill string and an end of a cable or coiled tubing,

electro pulse drilling a formation thereby simultaneously generating electromagnetic and acoustic signals;

receiving the acoustic signals with at least one device to receive such signals;

receiving the electromagnetic signals so generated with at least one device to receive such signals; and

using the received data, either directly or in processed form, to control the electro pulse drilling,

wherein the receiving the electromagnetic signals so generated with at least one device to receive such signals includes receiving electromagnetic and seismic waves from electrode discharge and plasma formation.

10. A device for electro pulse drilling, comprising: at least three electrodes for charging to a high voltage (charging electrodes) and subsequent discharging, arranged in angularly separated sectors within a circumference, and at least one electrode coupled to ground, the electrodes being configured to be arranged in a drilling face of a drill bit, with insulation between the electrodes, and being arranged so as to be coupled to an effect-adjustable high-voltage supply to provide an adjustable charge voltage for subsequent discharge via the electrodes, and selectably operable in a first mode in which plasma formation is provided within drilling fluid ahead of a drilling bit and a second mode in which plasma formation is provided into or onto a formation face ahead of the drilling bit.

11. A device according to claim 10 , wherein the electrodes are further arranged with individually switch-able coupling of the charging electrodes to the effect-adjustable electric high-voltage supply.

12. A device according to claim 10 , wherein the charge voltage is adjustable over a range with an end member voltage value of to at least 300 kV.

13. A device according to claim 10 , wherein the charge voltage is adjustable over a range with an end member voltage value of at least 250 kV.

14. A device for electro pulse drilling, comprising:

a charging electrode configured to charge to high voltage and subsequent discharging;

a ground electrode coupled to ground;

wherein the electrodes are configured to be disposed in a part of a drill bit, and being arranged to be coupled to an effect-adjustable high-voltage supply to provide an adjustable charge voltage for subsequent discharge via the electrodes, and further selectably operable in a first mode in which plasma formation is provided within drilling fluid ahead of a drilling bit and a second mode in which plasma formation is provided into or onto a formation face ahead of the drilling bit.

15. A device according to claim 14 , wherein the charge voltage is adjustable over a range with an end member voltage value of at least 250 kV.

16. An assembly for drilling and logging, comprising:

a device for electro pulse drilling (EPD device) configured to provide electrode discharge and plasma formation to generate seismic and electromagnetic waves therefrom;

at least one device configured to receive at least one component of the seismic waves generated by the electrode discharge and plasma formation by drilling using the EPD device; and

at least one device configured to receive at least one component of the electromagnetic waves generated by the electrode discharge and plasma formation by the drilling using the EPD device.

17. An assembly according to claim 16 , wherein the EPD device includes electrodes configured to be arranged so as to be capable of being coupled to an effect adjustable high-voltage supply to provide an adjustable charge voltage for subsequent discharge via the electrodes, so that plasma formation can thereby be provided selectably either in a drilling fluid ahead of a drilling bit, or into or onto a formation face ahead of the drilling bit.

18. An assembly according to claim 16 , wherein the device for electro pulse drilling includes at least three electrodes for charging to a high-voltage (charging electrodes) and subsequent discharging, arranged angularly separate within a circumference, and with at least one electrode coupled to ground, the electrodes being configured to be arranged in a drilling face of a drill-bit, with insulation between the electrodes, with individually switch-able coupling of the charging electrodes to an effect-adjustable electric high-voltage supply.

19. A method for electro pulse drilling and logging, comprising:

bringing a device for electro pulse drilling into a well-bore, in at least one of an end of a drill string and an end of a cable or coiled tubing,

electro pulse drilling a formation thereby simultaneously generating electrode discharge and plasma formation and electromagnetic and acoustic waves therefrom;

receiving seismic waves from the electrode discharge and plasma formation with at least one device to receive such waves, to produce received seismic data;

receiving electromagnetic waves from said electrode discharge and plasma formation with at least one device to receive such waves, to produce received electromagnetic data; and

using the received seismic and electromagnetic data, either directly or in processed form, to control the electro pulse drilling.

20. An assembly for drilling and logging, comprising:

a device for electro pulse drilling (EPD device) configured to generate acoustic signals and electromagnetic signals;

at least one device configured to receive the acoustic signals generated by drilling using the EPD device; and

at least one device configured to receive the electromagnetic signals generated by the drilling using the EPD device;

wherein said device configured to receive the electromagnetic signals and said device configured to receive the acoustic signals are arranged to receive electromagnetic and seismic waves from the electrode discharge and plasma formation.

21. An assembly as claimed in claim 20 , wherein the at least one device configured to receive the electromagnetic signals generated by the EPD device is configured to receive electromagnetic and seismic waves from electrode discharge and plasma formation.

22. An assembly as claimed in claim 20 , wherein the at least one device configured to receive the acoustic signals generated by the EPD device is configured to receive electromagnetic and seismic waves from electrode discharge and plasma formation.

23. A method for electro pulse drilling and logging, comprising:

bringing a device for electro pulse drilling into a well-bore, in at least one of an end of a drill string and an end of a cable or coiled tubing,

electro pulse drilling a formation thereby simultaneously generating electromagnetic and acoustic signals;

receiving the acoustic signals with at least one device to receive such signals;

receiving the electromagnetic signals so generated with at least one device to receive such signals; and

using the received data, either directly or in processed form, to control the electro pulse drilling,

wherein said receiving the acoustic signals and said receiving the electromagnetic signals include receiving electromagnetic and seismic waves from electrode discharge and plasma formation.