Exploitation method of communication well of geothermal energy bore well

A mining method and underground heat technology, which can be used in the fields of mining fluids, earth-moving drilling, wellbore/well components, etc., and can solve the problems of water penetration loss of injected water, affecting water utilization rate, etc.

Active Publication Date: 2010-01-20
EXPLORATION TECH RES INST OF CHINESE ACADEMY OF GEOLOGICAL SCI
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Problems solved by technology

Due to the influence of the distribution of underground fissures, it may also c...

Method used

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  • Exploitation method of communication well of geothermal energy bore well
  • Exploitation method of communication well of geothermal energy bore well
  • Exploitation method of communication well of geothermal energy bore well

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Embodiment

[0025] see Figure 6 , according to the technical scheme of the present invention, in the case of clear exploration or understanding of the local geothermal gradient, according to the outlet well temperature to be achieved, through heat exchange analysis, a target well 4 conventional vertical wells (or horizontal wells) are drilled to reach the target formation, Run the casing and cement the well; then drill the directional horizontal butt joint well 2, and calculate the distance S between the directional horizontal butt joint well 2 and the target well 4 on the ground according to the known method according to the target area center of the target well 4 and the outlet water temperature requirements , and then design the directional horizontal docking well, determine the directional deflection radius R of the directional horizontal docking well, calculate the deflection start point A, deflection end point B, and horizontal section length L of the directional horizontal docking ...

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Abstract

The invention provides an exploitation method of a communication well of a geothermal energy bore well. At least one general vertical well of the bore wells is used as the target well having the appointed well depth, and a technical sleeve is installed to fix the well; the other oriental horizontally butted well is bored at a certain distance, and the oriental horizontally butted well sequentially comprises a vertical section, an incline section and a horizontal section, wherein the horizontal section is butted and communicated with the bottom of each of the target wells, or the horizontal section is butted and communicated with the bottom of each of the target wells by compression fracture technique when reaching the target area at the bottom of the target well. The bottom of the target well is expanded by a way of bit hole-expansion or well bottom explosion; preferably the diameter of the target well is larger than 200 mm. The invention ensures that two (or more) holes (wells) are communicated, and water is injected into one (or more) well, the water at normal temperature performs the heat exchange with the geothermal resource underground through a drilling passage, and then theother well(s) can produce high-temperature hot water. The invention has the advantages that the exploitation method is not influenced by the landform and the slotted rock stratum.

Description

technical field [0001] The invention relates to the field of exploitation and development of underground thermal energy, is applicable to geothermal fields with or without hot water or geothermal pressure, and is especially suitable for the development and utilization of dry heat geothermal sources. Background technique [0002] Exploitation of underground hot dry rock resources, whether there is underground hot water resources or not, can be used to develop underground thermal energy, which can greatly save energy consumption, reduce traditional energy such as coal and oil, create wealth for human beings, and cause pollution to the environment. Geothermal fields simultaneously minimize impacts on land subsidence and groundwater. [0003] At present, people's development and utilization of underground hot dry rock is mainly for power generation. Developed countries such as the United States, France, Germany, Japan, Italy and the United Kingdom have mastered the basic princi...

Claims

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Application Information

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IPC IPC(8): E21B43/24
Inventor 向军文胡汉月刘志强刘海翔隆东
Owner EXPLORATION TECH RES INST OF CHINESE ACADEMY OF GEOLOGICAL SCI
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