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A Calculation Method of Heat Loss in Geothermal Wells

A calculation method and heat loss technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as the analysis and calculation method without adding heat insulation coating

Inactive Publication Date: 2017-08-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods all use mathematical calculations to analyze the temperature and heat loss of geothermal wellbore, and do not give the analysis and calculation methods without adding thermal insulation coating and after adding thermal insulation coating, and compare the calculation results of the two

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  • A Calculation Method of Heat Loss in Geothermal Wells
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Embodiment Construction

[0038] The content of the present invention will be further described below in conjunction with the accompanying drawings.

[0039] At first, introduce the process that the present invention establishes mathematical model, Fourier's theorem is the basic theorem of heat conduction, and it shows that the heat flow of conduction is directly proportional to temperature gradient and the cross-sectional area perpendicular to the heat flow direction, namely:

[0040]

[0041] Among them: Q represents the heat conducted per unit time, in W; A represents the heat conduction area, that is, the cross-sectional area perpendicular to the direction of heat flow, in m 2 ; Indicates the temperature gradient, unit K / m; λ value proportional coefficient, called thermal conductivity, unit W / m K; q indicates heat flow per unit heat conduction area, unit W / m 2 .

[0042] For a single-layer long cylindrical wall used in geothermal wellbores, Fourier's theorem can be rewritten as:

[0043] ...

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Abstract

The invention discloses a calculation method for the heat loss of a geothermal well. By establishing a mathematical model of the vertical wellbore temperature field, the heat conduction and heat loss mechanism of the geothermal wellbore are analyzed. The method of the invention divides the geothermal wellbore into three sections, and according to the structure of each section The characteristics of each section of structure are discretized into several parts, and the heat loss is calculated separately; then the sum of each part is the final heat loss of the section; finally, after adding the heat losses of the three sections of the structure, that is The overall heat loss of the wellbore at a certain moment can be obtained; the present invention also proposes to increase the thermal insulation coating to reduce the thermal loss, and analyze the thermal insulation by calculating the heat loss of the light oil pipe and the thermal insulation oil pipe with the thermal insulation coating respectively. Susceptibility and effectiveness of coatings to wellbore heat loss.

Description

technical field [0001] The invention belongs to the field of geothermal resources, and in particular relates to a calculation method for heat loss of geothermal wells. Background technique [0002] Geothermal well refers to a device that uses geothermal energy with a depth of more than 3000m to generate electricity. Geothermal resources have a wide range of uses, and are usually converted into electrical energy on site or used directly. At present, my country mainly uses geothermal resources for power generation, industrial drying, refrigeration, heating, greenhouses and other fields. Due to the clean and renewable characteristics of geothermal resources, the utilization of geothermal resources has been greatly developed in recent years. However, in the process of geothermal acquisition, there is an inevitable problem of heat loss in geothermal wells; during the distance from the wellhead to the injection layer, the heat of the steam in the wellbore will be continuously dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 邵继业李捷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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