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Exploitation method for geothermal energy in salt mineral deposit

A mining method and geothermal energy technology, applied in geothermal energy power generation, other non-combustion heat generation, heating devices, etc., can solve the problems of low heat exchange efficiency and no scientific and efficient methods, and achieve stability and sufficient Heat exchange space, effect of high specific heat capacity

Inactive Publication Date: 2014-03-19
中盐勘察设计院有限公司
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AI Technical Summary

Problems solved by technology

However, at this stage, as far as the geothermal energy collection and utilization of salt deposit formations are concerned, there is no more scientific and efficient method, and the existing methods generally have the defect of low heat transfer efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0008] Embodiment: The rock salt deposit in Kenli County, Dongying City, Shandong Province has a buried depth of 3800-4200 meters, a thickness of about 40 meters, a salt grade of 90%, and an underground formation temperature of about 120°C. It is currently the deepest rock salt deposit proposed to be developed in the world. The thickness of the salt layer is not large, the drilling depth is large, and the development cost is quite high: first, the investment in drilling is high, and the investment in a single pair of horizontal wells exceeds 50 million yuan. If a certain production scale is formed, about 10 pairs of wells will be drilled; second, the operating cost is high , The brine is lifted out of the ground from a depth of 4000 meters, and the energy consumption of brine mining will be very high.

[0009] Take Kenli Salt Mine in Dongying, Shandong as an example to illustrate the key points of the invention.

[0010] 1. Drilling

[0011] Construct the parallel wells acco...

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Abstract

The invention discloses an exploitation method for geothermal energy in a salt mineral deposit. The exploitation method includes the following steps that (1), one or more pairs of horizontal abutting-joint wells are drilled in the salt mineral deposit; (2), a continuous screen pipe is placed in the horizontal wells and used for preventing horizontal well sections from being closed due to plastic deformation; (3), saturated salt water or other insoluble salt liquid are injected into a salt layer through a liquid injecting well, flow to a liquid outlet well through the horizontal wells, then flow to a geothermal conversion device and is injected into the liquid injection well again, and the circulation is performed continuously. The exploitation method has the advantages that the dissolvability characteristic of the salt mineral deposit is used, a sizeable channel can be constructed underground, compared with an existing method in the background technology, the exploitation method has sufficient heat exchange space, and therefore heat exchange efficiency is higher.

Description

technical field [0001] The invention belongs to the technical field of geothermal energy collection and utilization. More specifically, the present invention relates to a method of mining geothermal energy in salt deposits. Background technique [0002] As a clean and long-term power generation method, the use of geothermal energy for power generation has become more and more popular. Its main geothermal collection method is to drill deep underground rocks and inject water into these artificially created, open and connected fracture zones underground. The water is heated after contact with the rock mass, and the high-temperature water produces steam, which can be used to generate electricity. The concept itself mimics a naturally occurring hot water type geothermal circulation system. At present, more than 70 countries around the world use this enhanced geothermal system for geothermal power generation. [0003] At present, the ultra-deep drilling technology has develope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J3/08
CPCY02E10/10
Inventor 续培信樊传忠
Owner 中盐勘察设计院有限公司
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