Method and system for generating through underground temperature difference

Abstract

A method and a system for generating through underground temperature difference are the method and system for generating by utilizing the underground temperature condition in the drilling process according to Seebeck effect. The system comprises a drilling pipe with a thermal-protective coating, a drill collar and a temperature difference generating device which comprises a heat transmitting part, a radiating part and a temperature difference generating module. The method comprises the steps of: adding a layer of heat insulation materials in the inner wall of the drilling pipe and the drill collar as the thermal-protective coating, adding a layer of compression-resist anti-corrosion materials on the inner wall of the thermal-protective coating as the inner wall layer so as to form the drilling pipe with a thermal-protective coating and the drill collar, transmitting heat of the outer wall to the heating end of the temperature difference generating module through the heat transmitting part, contacting the radiating part with the mud flowed into the drill collar so as to ensure a lower temperature at the cooling end of the temperature difference generating module, transforming the temperature difference into a potential difference through the temperature difference generating module, and supplying to underground measuring devices like a wireless drilling clinometer after switching through a voltage-stabilizing constant-current circuit or storing and backing up the electric power in a storage battery for the underground measuring device, so as to prolong the continuous working time of the underground measuring devices like a wireless drilling clinometer.

Description

Technical field [0001] The invention relates to a method for generating electricity by using temperature difference, which is a method and a system for generating electricity by using temperature difference in a drilling well. Background technique [0002] At present, thermoelectric power generation technology has been used in many fields. It is based on the Seebeck effect. When two different conductors are connected into a closed loop, if its two contacts are placed in two environments with different temperatures , then there will be a current in the circuit, and the electromotive force of the current is V=aΔT, where a is the temperature difference electromotive force rate, and ΔT is the temperature difference between the contacts. However, this technology has not yet been applied in oil drilling. During the drilling process, with the influence of well depth and geological environment, the downhole temperature will increase accordingly. In addition, the drill bit will rub a...

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Problems solved by technology

However, this technology has not yet been applied in oil drilling. During the drilling process, with the influence of well depth and geological environment, the downhole temperature will increase accordingly. In addition, the drill bit will rub against the underground rock with the depth of drilling, which will generate a lot of heat. At this time, the closer to the drill bit, the higher the temperature. Since the mud flows from the drill pipe and the drill stringer to the drill bit, as long as the inner layer of the drill pipe and drill collar has a certain temperature insulation function, and the temperature of the mud flowing in is relatively low, close There will be a large temperature difference between the outer wall layer of the drill collar of the drill bit and the mud in the drill pipe and drill collar

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