1 results about "Nichrome" patented technology

The invention relates to a multifunctional composite oil and gas well integrated continuous oil extraction string which comprises an oil pipe and a sleeve, a heating cable, a sampling pipe, a liquid injection pipe, a temperature measuring cable and a pressure measuring cable are arranged in an annular space between the oil pipe and the sleeve, and a heat preservation filling layer is arranged in the annular space between the oil pipe and the sleeve. A non-heating section, a transition section and a heating section are sequentially arranged on the continuous oil extraction pipe column from top to bottom in the length direction, a heating cable of the non-heating section comprises a central copper stranded conductor, the diameter of the copper stranded conductor ranges from 20 mm to 30 mm, a heating cable of the transition section comprises a central nickel-chromium alloy conductor, and the diameter of the nickel-chromium alloy conductor ranges from 10 mm to 20 mm. The heating cable of the heating section comprises a nickel-chromium alloy conductor in the center, and the diameter of the nickel-chromium alloy conductor is 2-10 mm. The continuous oil extraction pipe column integrates oil extraction, heating, detection, sampling and liquid injection, the functions are comprehensive, the whole oil extraction pipe column comprises a non-heating section, a transition section and a heating section, and energy can be saved.