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Drilling multi-point communication geothermal circulating collection method

A multi-point, geothermal technology, applied in geothermal energy, geothermal power generation, geothermal collectors, etc.

Active Publication Date: 2013-10-23
北京中和绿建能源科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Existing geothermal energy extraction methods have failed to achieve breakthroughs in this area

Method used

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  • Drilling multi-point communication geothermal circulating collection method

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Effect test

Embodiment Construction

[0015] 1. According to the geological data and the formation pressure gradient of the target layer (ie geothermal reservoir), determine two or three wells.

[0016] 2. The distance between wells A and B should be within the maximum limit for safe construction of directional wells.

[0017] 3. Wells A and B were drilled to reach the target layer respectively and sealed with technical casing.

[0018] 4. Lower the oblique device in the lower part of Well A (close to the heat storage layer), and use directional drilling tools and MWD tools to open windows and sidetrack in the direction of Well B. The displacement is 30-40 meters and the well deviation is reduced to 0 degrees. Drilling parallel to Well A to a depth of 40 meters beyond the main well. Pull out the drill and lower the packer or inject cement at the deflection building or stabilizing place. Drill down to break the casing foot of the skewer, and use MWD and geosteering technology to communicate with the branch well ...

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Abstract

A drilling multi-point communication geothermal circulating collection method is characterized in that a multi-point communication system is formed between two wells by the aid of drilling technology, and heat is obtained in a circulating manner in the multi-point communication system through working media. A method for multi-point communication between the two wells includes the steps: firstly, performing sidetracking from the lower portion of one well (A) to the other well (B), performing parallel drilling at a position with a certain distance away from a main well and exceeding the depth of the main well; secondly, packing communication between the upper portion of each multilateral well and the main well; thirdly, communicating the bottom of the main well with the lower portion of the multilateral well; fourthly, forming a plurality of parallel communication channels from the lower portion of the other well (B) to multilateral well sections at certain intervals. Technical extension includes that the multi-point communication system is fractured to obtain a crack running through the communication system, and the contact area of the working media and a heat source is increased. One well is respectively in multi-point communication with a plurality of wells in different directions to form a grouped communication system, namely, one injection well supports two production wells, three production wells, four production wells and the like to improve efficiency.

Description

1 technical field [0001] The invention is a method of geothermal energy development technology. It involves related science and technology in the fields of geothermal energy, geological structure and oil drilling technology. 2 background technology [0002] At present, there are three main methods of geothermal energy extraction. [0003] The first type drills vertical wells through the water-bearing sands of geothermal reservoirs. The lower screen sees water, and the upper part is sealed with a casing. Then the submersible pump pumps the high-temperature hot water to the ground for utilization. One, this method is limited by resource conditions, and the other is that it consumes groundwater resources and cannot be used sustainably. [0004] The second method is to drill two vertical wells within a certain distance. One serves as an injection well and the other serves as a pumping well. [0005] Although this method avoids the consumption of groundwater resources. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/14F24J3/08
CPCY02E10/10F24T10/10
Inventor 刘洪斌
Owner 北京中和绿建能源科技有限公司
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