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Completion method of enhanced geothermal system through communication and circulation of two wells

An enhanced geothermal technology, applied in geothermal energy, geothermal power generation, geothermal collectors, etc., can solve the problems of expensive fracturing and increased development costs

Inactive Publication Date: 2017-05-10
CNPC DRILLING RES INST +1
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Problems solved by technology

However, the disadvantages of this system are: fracturing is required after drilling two wells, and the cost of fracturing 1000m long is about 6 million. The cost of fracturing is expensive, which increases the development cost

Method used

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  • Completion method of enhanced geothermal system through communication and circulation of two wells

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Embodiment Construction

[0016] The following is attached figure 1 , describe the present invention in detail, as follows:

[0017] A well completion method for a two-well connected circulation enhanced geothermal system, mainly 1 vertical well section of water injection well, 2 horizontal section of water injection well, 3 water production well, 4 surface casing of water injection well, 5 technical casing of vertical well section of water injection well, 6 horizontal section of water injection well Section technical casing, 7 water production well upper technical casing, 8 water production well lower technical casing, 9 water production well surface casing.

[0018] In the present invention, when parameters such as geographic location, orientation, and depth of the geothermal reservoir are determined, a vertical well is first drilled on the upper part of the geothermal reservoir, which is the water production well 3. The well type of the water production well 3 is a vertical well, and a 374.4mm drill...

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Abstract

The invention relates to a completion method of an enhanced geothermal system through communication and circulation of two wells. The completion method is characterized in that when being injected into a water injection well, water is subjected to low-efficiency heat exchange in a straight well section of the water injection and then enters a geothermal reservoir along a horizontal heat collection well, and the water is subjected to sufficient and high-efficiency heat exchange with the geothermal reservoir through a high-temperature-resistant casing pipe and then enters a heat extracting well; high-temperature hot water passes through a heat-insulating protective layer formed by an intermediate casing with the interior and exterior coated with a thermal insulation material in the heat extracting well and then extracted out of the ground, and the extracted hot water is used for generating electricity.

Description

technical field [0001] The invention relates to the technical field of geothermal exploitation, in particular to a well completion method of a two-well connected circulation enhanced geothermal system. Background technique [0002] Resources and the environment are the basic conditions for the survival, reproduction and development of human beings, and resources, environment and sustainable development have become major issues facing all human beings. In the past century, the population of the world has doubled, the consumption of energy and natural resources has increased by 10 times, the use of non-renewable energy has greatly exceeded the capacity of the environment, and air pollution and global warming are seriously threatened As a clean and non-polluting renewable energy source, geothermal resources are attracting more and more attention as people's environmental protection awareness is becoming stronger and stronger today. [0003] Geothermal resources refer to the he...

Claims

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Application Information

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IPC IPC(8): E21B43/30E21B7/04E21B17/00F24J3/08
CPCE21B7/04E21B17/00E21B43/305F24T10/00F24T2010/50Y02E10/10
Inventor 查永进任威严刘明鑫杜世亮
Owner CNPC DRILLING RES INST
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