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Medium-deep sandstone geothermal horizontal level exploitation method and structure

A mining method and horizontal well technology are applied in the field of mining methods and structures of mid-deep sandstone geothermal horizontal wells, which can solve the problems of low extraction and recharge flow, poor utilization of geothermal resources, low economic benefits, etc. The probability of increasing the mining volume and economic benefits, and the effect of increasing the mining area

Pending Publication Date: 2017-07-25
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

However, in the exploitation and recharge of mid-deep hydrothermal geothermal resources, vertical geothermal wells have long been used, resulting in low efficiency of vertical well exploitation and recharge, especially in mid-deep sandstone geothermal resources, making The flow rate of extraction and recharge is extremely low, which makes the utilization of geothermal resources poor and economical

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  • Medium-deep sandstone geothermal horizontal level exploitation method and structure
  • Medium-deep sandstone geothermal horizontal level exploitation method and structure
  • Medium-deep sandstone geothermal horizontal level exploitation method and structure

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Embodiment Construction

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0037] Refer to attached figure 1 , 2 , 3, 4, the embodiment of the present invention provides a kind of deep sandstone geothermal horizontal well exploitation method, comprises the following steps:

[0038] (1) Select the target reservoir 1 of the middle-deep sandstone geothermal field, adopt a full-bore drilling tool to drill a vertical well 2, and stop at the target depth of the target reservoir 1 from the bottom of the vertical well 2;

[0039] Further, the diameter of the vertical shaft 2 is not less than 0.4m, and its inclination angle is not more than 1.5°;

[0040] Further, the minimum thickness of the target reservoir 1 is 20m, its porosity is greater than 20%, and its permeability is greater than 0.38μm 2 ;

[0041] (2) lower the outer casi...

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Abstract

The embodiment of the invention discloses a medium-deep sandstone geothermal horizontal level exploitation method and structure. A horizontal well is built on a sandstone geothermal reservoir, a production well composed of a vertical well and the horizontal well is formed, and finally, the novel technology and method for exploiting and recharging the geothermal generation well are formed; the horizontal well is a single horizontal well or a plurality of parallel horizontal wells; the effective contact superficial area of the drilled well and the reservoir is increased, the exploitation and recharging efficiency is improved, the geothermal well yield is greatly increased, and economic benefits are improved.

Description

technical field [0001] The invention relates to the technical field of geothermal resource exploitation, in particular to a mining method and structure of a mid-deep sandstone geothermal horizontal well. Background technique [0002] Geothermal energy resources can be divided into shallow geothermal, hydrothermal and dry hot rock types. Most of the geothermal resources in my country are medium and low temperature hydrothermal, mainly distributed in the southeast coast and inland basins. At present, more than 2,900 hydrothermal geothermal resources have been discovered, with a total natural heat release equivalent to 7.5 million tons. Among them, most of the proven deep hydrothermal geothermal resources in my country are basin-type sandstone reservoirs. [0003] In related technologies, the exploitation of geothermal resources is to drive one (or several) vertical geothermal wells into the reservoir of geothermal resources, wherein one (or several) is used as a recharge well ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/14E21B43/30F24J3/08E21B7/04E21B43/26E21B43/32
CPCE21B7/04E21B7/046E21B43/14E21B43/26E21B43/305E21B43/32F24T10/20Y02E10/10
Inventor 骆进朱永强赵强项伟
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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