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Method for evaluating terrestrial heat single-well stratum thermal property distribution

A technology of thermophysical properties and formation, applied in the field of geothermal single well formation thermophysical property distribution evaluation, can solve the problems of poor model applicability, complex analysis process, low data accuracy, etc., and achieve the effect of accurate specific heat capacity distribution

Inactive Publication Date: 2014-06-25
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Well logging technology also has certain limitations in practical application, such as low data accuracy, poor model applicability, complex analysis process and high cost, etc.
[0007] In conclusion, the current methods for analyzing the thermophysical properties of formations have some limitations

Method used

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  • Method for evaluating terrestrial heat single-well stratum thermal property distribution
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  • Method for evaluating terrestrial heat single-well stratum thermal property distribution

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Embodiment 1

[0023] Embodiment 1: This embodiment provides a geothermal single-well formation thermophysical property distribution evaluation method using dual wellbores, using Monte Carlo algorithm to invert formation thermal conductivity and specific heat capacity.

[0024] Such as figure 2 As shown, a single geothermal well includes an inner cylinder and an outer cylinder, and isothermal water is injected into the outer cylinder at a certain rate. The water flows from the wellhead to the bottom of the well in the outer cylinder, then enters the inner cylinder from the bottom of the well, and finally flows out at the wellhead. Place thermocouples at each depth in the outer cylinder and connect them to a data acquisition instrument to measure the temperature of water at each depth in the outer cylinder at different times.

[0025] Since there is no measured data, it can be assumed that a virtual geothermal single well is 5000m deep and the geothermal gradient is 0.03K m -1 , the formati...

Embodiment 2

[0028] Embodiment 2: This embodiment provides a geothermal single-well formation thermophysical property distribution evaluation method using dual wellbores, and uses the Monte Carlo algorithm based on Latin hypercube sampling to invert the formation thermal conductivity and specific heat capacity.

[0029] Such as figure 2 As shown, a single geothermal well includes an inner cylinder and an outer cylinder, and isothermal water is injected into the outer cylinder at a certain rate. The water flows from the wellhead to the bottom of the well in the outer cylinder, then enters the inner cylinder from the bottom of the well, and finally flows out at the wellhead. Place thermocouples at each depth in the outer cylinder and connect them to a data acquisition instrument to measure the temperature of water at each depth in the outer cylinder at different times.

[0030] Since there is no measured data, it can be assumed that a virtual geothermal single well is 5000m deep and the geo...

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Abstract

The invention provides a method for evaluating terrestrial heat single-well stratum thermal property distribution. The method is a novel method for evaluating terrestrial heat single-well ground thermal property distribution and is used for analyzing the heat conductivity and specific heat capacity of terrestrial heat well stratum. The method comprises the following steps: injecting water into a wellbore of a terrestrial heat well, measuring distribution of well temperatures along with the wellbore under different time, and inverting the heat conductivity of the stratum and distribution of the specific heat capacity along with the depth of the stratum according to a heat transfer principle of the wellbore and the stratum. The method is simple, rapid, economic and effective, and the obtained stratum is high in thermal property precision.

Description

technical field [0001] The invention relates to the field of stratum thermophysical property analysis, in particular to a geothermal single well stratum thermal property distribution evaluation method for calculating the thermal conductivity and specific heat capacity of the stratum. Background technique [0002] Geothermal well formation thermophysical properties refer to the thermal conductivity and specific heat capacity of the formation, which are important parameters for geothermal power generation. For example, the choice of working fluid and the heat transfer coefficient between the formation and the working fluid are closely related to the formation thermal physical properties. [0003] At present, there are few studies on the thermophysical properties of geothermal well formations, and the main research is on the thermophysical properties of oil well formations. The methods are mainly divided into laboratory measurement, theoretical calculation and logging technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
Inventor 程文龙王昌龙年永乐李同同
Owner UNIV OF SCI & TECH OF CHINA
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