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Apparatuses and methods for supplying electrical power to an electrocrushing drill

a technology of electrocrushing drill and apparatus, applied in the field of electrocrushing drill, can solve the problems of repetitive application, rock fracture, rock fracture, etc., and achieve the effects of minimizing losses, sufficient microwave bandwidth, and improving power transmission

Inactive Publication Date: 2014-01-09
SDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for providing power to a down-hole pulsed power system using microwaves. The method involves transmitting microwaves from an above-ground microwave transmitter to a down-hole microwave receiver and charging one or more capacitors in the down-hole pulsed power system. The method also includes transmitting data back to the surface using a down-hole low power transmitter, and using a metallic drill pipe or drilling fluid as a microwave waveguide to minimize losses and improve power transmission. The drilling fluid used in the system should have properties such as non-conductive, non-aqueous, insulating, and dielectric. The technical effect of the invention is the increased efficiency and reliability of power transmission to down-hole pulsed power systems.

Problems solved by technology

The expansion of the hot gases created by the arc fractures the rock.
This expansion pressure fails the rock in tension, thus creating rock fragments.
In such a process, rock is fractured by repetitive application of the shock wave.
This is because both of those methods crush the rock in compression, where rock is the strongest, while the electrocrushing method fails the rock in tension, where it is relatively weak.

Method used

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  • Apparatuses and methods for supplying electrical power to an electrocrushing drill
  • Apparatuses and methods for supplying electrical power to an electrocrushing drill
  • Apparatuses and methods for supplying electrical power to an electrocrushing drill

Examples

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Effect test

example 1

[0186]An apparatus utilizing FAST Drill technology in accordance with the present invention was constructed and tested. FIG. 30 shows FAST Drill bit 114, the drill stem 216, the hydraulic motor 218 used to turn drill stem 216 to provide power to mechanical teeth disposed on drill bit 114, slip ring assembly 220 used to transmit the high voltage pulses to the FAST bit 114 via a power cable inside drill stem 216, and tank 222 used to contain the rocks being drilled. A pulsed power system, contained in a tank (not shown), generated the high voltage pulses that were fed into the slip ring assembly. Tests were performed by conducting 150 kV pulses through drill stem 216 to the FAST Bit 114, and a pulsed power system was used for generating the 150 kV pulses. A drilling fluid circulation system was incorporated to flush out the cuttings. The drill bit shown in FIG. 4 was used to drill a 7 inch diameter hole approximately 12 inches deep in rock located in a rock tank. A fluid circulation s...

example 2

[0187]A high permittivity fluid comprising a mixture of castor oil and approximately 20% by volume butylene carbonate was made and tested in accordance with the present invention as follows.

1. Dielectric Strength Measurements.

[0188]Because this insulating formulation of the present invention is intended for high voltage applications, the properties of the formulation were measured in a high voltage environment. The dielectric strength measurements were made with a high voltage Marx bank pulse generator, up to 130 kV. The rise time of the Marx bank was less than 100 nsec. The breakdown measurements were conducted with 1-inch balls immersed in the insulating formulation at spacings ranging from 0.06 to 0.5 cm to enable easy calculation of the breakdown fields. The delay from the initiation of the pulse to breakdown was measured. FIG. 31 shows the electric field at breakdown plotted as a function of the delay time in microseconds. Also included are data from the Charlie Martin models f...

example 3

[0302]The length of the drill stem was fifty cm, with a 5.5 meter long cable connecting it to the pulse modulator to allow operation in a one meter roof height. The drill was designed to go three meters into the roof with a hole diameter of approximately four cm. The drilling rate was approximately 0.5 meters per minute, at approximately seven to ten holes per hour.

[0303]The drill system had two drills capable of operation from a single pulse generator. The drill stem was mounted on a holder that located the drill relative to the roof, maintained the desired drill angle, and provided advance of the drill into the roof so that the operator was not required to hold the drill during the drilling operation. This reduced the operator's exposure to the unstable portion of the mine. While one drill was drilling, the other was being set up, so that one man was able to safely operate both drills. Both drills connected to the pulse generator at a distance of a few meters. The pulse modulator ...

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Abstract

Methods and apparatuses for directly charging capacitors in a down-hole pulsed power system used for electrocrushing drilling. An above ground power supply is directly connected to the capacitors. The power supply can be a switching power supply, a DC supply, or an AC supply. Capacitor voltage is monitored and controlled. The system reduces noise caused by coupling control signal cables and the power cable, and does not have the ground swing control problems of other charging schemes. The power may alternatively be provided by microwave transmission.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]This application claims priority to and the benefit of the filing of U.S. Provisional Patent Application Ser. No. 61 / 668,304, entitled “Apparatus and Method for Supplying Electrical Power to an Electrocrushing Drill”, filed on Jul. 5, 2012; U.S. Provisional Patent Application Ser. No. 61 / 738,837, entitled “Repetitive Pulsed Electric Discharge Power Generation and Control Apparatus and Method of Use”, filed on Dec. 18, 2012; and U.S. Provisional Patent Application Ser. No. 61 / 739,172, entitled “Repetitive Pulsed Electric Discharge Apparatus and Method of Use”, filed on Dec. 19, 2012, the specification and claims of which are incorporated herein by reference.[0002]This application is related to U.S. patent application Ser. No. 13 / 346,452, filed Jan. 9, 2012, entitled “Apparatus and Method for Supplying Electrical Power to an Electrocrushing Drill”, which is a continuation-in-part application and claims the benefit and priority of U.S. pate...

Claims

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Application Information

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IPC IPC(8): E21B7/15
CPCE21B7/15E21B17/003E21B41/0085
Inventor MOENY, WILLIAM M.
Owner SDG LLC
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