Method and system for generating through underground temperature difference

A technology of thermoelectric power generation and thermoelectric power generation module, which is applied in the directions of generators/motors, electrical components, etc., can solve problems such as low mud temperature, and achieve the effect of reducing the impact

Inactive Publication Date: 2010-12-08
张鹏
4 Cites 13 Cited by

AI-Extracted Technical Summary

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. Sin...
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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.

Application Domain

Technology Topic

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  • Method and system for generating through underground temperature difference
  • Method and system for generating through underground temperature difference
  • Method and system for generating through underground temperature difference

Examples

  • Experimental program(1)

Example Embodiment

[0016] in figure 1 In the illustrated embodiment, the thermoelectric power generation device (1) is installed in the drill stand (2) with a heat insulation layer above the drill bit (4), and the wireless inclinometer while drilling (3) is located in the thermoelectric power generation device (1) Above.
[0017] in figure 2 In the illustrated embodiment, the inner wall layer (3) is fixed from one end of the drill collar or drill rod to the outer wall layer (1) with a uniform gap in between, and the liquid material forming polyurethane foam is poured into the gap, After foaming, an insulating layer (2) is formed.
[0018] in image 3 In the illustrated embodiment, the two N-type semiconductors (1) and P-type semiconductors (2) are a power generating group. The bottom ends of each group are connected from left to right. The second pin of the first group of the top part is connected to the first group. The first pin of the second group is connected, the second pin of the second group is connected to the first pin of the third group, the three power generating groups are connected in series, and the two ends are respectively connected to the insulating and thermally conductive members (3) to form a hot end And the cold end, thus forming a thermoelectric power generation module, the first pin of the first power generation group and the second pin of the third power generation group are led out with an outer insulated wire.
[0019] in Figure 4 In the illustrated embodiment, a part of the heat absorption layer (2) is built into the heat insulation layer of the drill collar with heat insulation layer, and one end is connected to the outer wall layer of the drill collar with heat insulation layer, and the heat absorption layer (2) A part of it is drawn from the thermal insulation layer and inner wall layer of the drill collar with thermal insulation layer, the outer layer is the thermal insulation layer (3), the other end of the heat absorption layer is connected to the hot end of the thermoelectric power generation module (1), the thermoelectric power generation module The cold end of (1) is connected to the compression layer (4), and the compression layer (4) also serves as the heat dissipation layer of the thermoelectric power generation module (1), and the insulation layer (3) and the thermoelectric power generation module (1) are sealed in the compression layer (4) Within.
[0020] When the mud flows through the compressive layer, the cold end of the thermoelectric power generation module has a relatively low temperature. The heat absorption layer absorbs the heat of the outer wall layer of the drill collar with the heat insulation layer, and the heat insulation layer keeps the heat of the heat absorption layer from flowing to the drill bit. The low-temperature mud is absorbed, and the heat absorption layer quickly transfers heat to the hot end of the thermoelectric power generation module, which increases the temperature of the hot end. At this time, there is a temperature difference between the hot end and the cold end of the power generation unit. Then there is an electromotive force, which can be connected to a constant-voltage and constant-current circuit to output a stable voltage and constant current direct current, which can supply power to the wireless MWD inclinometer installed in the drill stand with insulation layer, and can also transfer electrical energy Stored in the battery of the wireless inclinometer while drilling.
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Description & Claims & Application Information

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