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Method for exploiting compact dry heat rock geothermal energy by utilizing long horizontal well self-circulation structure

A technology of long horizontal wells and hot dry rocks, applied in geothermal energy power generation, geothermal energy systems, heat collectors using groundwater as a working fluid, etc., to improve corrosion resistance and heat exchange capabilities, improve heat exchange efficiency, and be economical benefit effect

Inactive Publication Date: 2016-08-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no efficient and safe geothermal mining method for hot dry rock

Method used

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  • Method for exploiting compact dry heat rock geothermal energy by utilizing long horizontal well self-circulation structure
  • Method for exploiting compact dry heat rock geothermal energy by utilizing long horizontal well self-circulation structure
  • Method for exploiting compact dry heat rock geothermal energy by utilizing long horizontal well self-circulation structure

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] A method for self-circulating exploitation of compact hot dry rock geothermal energy by using a long horizontal well, the specific steps are as follows:

[0035] (1) if figure 1 As shown, the hot dry rock reservoir 2 is selected, and a conventional tower drilling tool is used in the surface area, and a drill bit larger than 20 inches is used to drill. Used to protect the wellhead and isolate the upper aquifer. During the drilling process, high temperature resistant drilling fluid should be used for drilling;

[0036] (2) Replace the drill bit with a smaller drill bit size greater than 12 inches, and drill the vertical section 8 of the horizontal well. After drilling into the hot dry rock reservoir 2, continue drilling for more than 10m, and then use the deflection tool to deflect and drill water In the horizontal section 9 of the flat well, during the drill...

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Abstract

The invention relates to a field of geothermal energy development and provides a method for exploiting compact dry heat rock geothermal energy by utilizing a long horizontal well self-circulation structure. According to the invention, a single long horizontal well in a dry heat rock storage layer is utilized, an oil pipe-loop empty circulation structure of the single long horizontal well is adopted under a condition of not cracking the dry heat rock storage layer for performing circulation injection and production of heat carrying medium. During the injection process, a horizontal segment can be utilized fully for heating the heat carrying medium. During a production process, a prestress heat isolation oil tube is used for reducing heat loss of the heat carrying medium by using the prestress heat isolation oil tube. According to the invention, fluid loss caused by cracking can be avoided and the contact area of a well shaft and the storage layer is increased effectively due to the long horizontal segment. During the injection and production process, the temperature difference of the heat carrying medium also causes heat siphonage, so that ground injection and suction pump power is reduced effectively. At the same time, due to the closeness of the long horizontal well self-circulation structure, condition is provided for performance optimization of the heat carrying medium and problems of corrosion and scale formation are avoided and the heat collecting process becomes more reliable and stable.

Description

technical field [0001] The invention relates to the field of geothermal energy development, in particular to a process method for exploiting geothermal energy by using a horizontal well oil pipe and annular circulation injection fluid. Background technique [0002] Geothermal is one of the promising renewable energy sources. Compared with other new energy sources such as solar energy, wind energy, and biomass energy, it has the advantages of wide distribution, little external influence (such as day and night, wind speed, temperature difference), carbon emissions, and maintenance costs. low-level features. Geothermal heat can be divided into three types: convection type, conduction type and hot rock type. Convective geothermal heat brings the heat energy (50-350°C) deep in the earth to the surface through natural convection of hot water or water vapor in deep fractures; conductive geothermal heat is mostly located in sedimentary rock reservoirs (mainly sandstone reservoirs),...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B43/24E21B7/06F24J3/08F03G4/00
CPCE21B7/046E21B7/06E21B43/00E21B43/24F24T10/20Y02E10/10
Inventor 崔国栋任韶然张亮庄园张锐
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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