Downhole tool capable of withstanding high temperatures

摘要

Abstract invention patent: "the tool downhole able to withstand high temperatures.The present invention relates to a downhole tool of steel cable for performing an operation in a well in a depth of 15 km at the bottom of the well.The tool being powered by the DC voltage in a predetermined in a first end by a unit of power source that is configured to provide a specific tension of permanent state is selected from a plurality of predetermined voltages That includes an electric motor being powered by alternating current.A frequency converter disposed between the first end and the motor, and a unit for reduction of peak voltage adapted to reduce the voltage of permanent state of selected energy supplied to the frequency converter from the power source, the reduction unit. A peak voltage which comprises a capacitor.When the capacitor is a capacitor of high temperature which has a dielectric comprising a material capable of withstanding a temperature above 150 u00b0 C.In addition, the present invention relates to a column of downhole tool and a method for protecting an inverter of voltage spikes in the power supplied to the frequency converter in a downhole tool according to the present invention.