A method for constructing artificial heat storage by regional fracturing of hot dry rock
A hot dry rock and regional technology, applied in drilling equipment and methods, construction, earthwork drilling and mining, etc., can solve the problems of high cost of hydraulic fracturing, earthquakes, small heat transfer area of high-permeability fractures, etc., to achieve fracturing Wide range, good cracking effect and long service life
Active Publication Date: 2021-05-14
CHINA UNIV OF MINING & TECH
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Problems solved by technology
The cost of hydraulic fracturing is high, and the heat transfer area of a single high-permeability fracture formed is small, which is not suitable for geothermal exploitation; the high injection pressure during hydraulic fracturing may cause earthquakes, posing a threat to the safety of construction personnel and surface facilities
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[0019] The present invention will be further described below.
[0020] Such as figure 1 with figure 2 Shown, concrete steps of the present invention are:
[0021] A. First delineate the hot dry rock development area from the ground, and then carry out geological exploration to obtain the maximum depth and location of the upper surface of the hot dry rock 4 below the development area and the ground, and the location directly above the hot dry rock 4 with the maximum depth The ground is determined as the construction location of injection well 1;
[0022] B. Drill the injection well 1 downward from the ground at the determined construction position, firstly make the depth of the injection well 1 reach the maximum depth of the hot dry rock 4 obtained by exploration, and then use temperature measuring equipment to measure the temperature of the rock mass at this depth, If the temperature of the rock mass does not exceed 200°C, the injection well 1 is continuously drilled until...
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The invention discloses a method for constructing an artificial heat storage by regionally fracturing hot dry rocks. Firstly, the position of the injection well is determined on the ground, and then the injection well is drilled, and then a plurality of production wells are arranged around the injection well, and each production well The depth is the same as that of the injection well; at the well wall 50-100m above the deepest part of the injection well, a drilling and production hole is constructed for each production well. After the drilling and production hole is formed, the bottom of each drilling and production hole is continuously subjected to four forces The hot dry rocks below are formed sequentially from top to bottom: fissure zones, deformation zones, and original zones. The hot dry rocks in the fissure zones and deformation zones produce a large number of fissures. Pressure relief fracturing has good fracturing effect and wide fracturing range, which makes it difficult to close the cracks; finally realizes low-cost and high-efficiency construction of artificial heat storage, no need for hydraulic fracturing to save water resources, and due to the improved The permeability makes the artificial heat storage area have a high heat exchange capacity.
Description
technical field [0001] The invention relates to a method for constructing an artificial heat storage by regionally fracturing hot dry rock, and belongs to the technical field of thermal energy utilization of dry hot rock. Background technique [0002] Hot dry rock refers to a kind of hot rock mass with no water or little water, dense and impermeable, which exists in the depth of 3000-10000m in the formation. The temperature is generally between 150-650℃, and it is a clean and renewable green resources. The development and utilization of hot dry rock geothermal energy has the following characteristics: (1) The development potential of hot dry rock geothermal energy is huge. It is estimated that the total amount of hot dry rock geothermal resources with a depth of 3 kilometers in the earth's crust and a temperature above 200 °C is equivalent to 100 to 1,000 times that of fossil energy; (2) geothermal energy is clean, pollution-free, and has no harmful gas emissions and no (3...
Claims
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IPC IPC(8): E21B43/26E21B43/30E21B47/07E21B7/00F24T10/20
CPCE21B43/26E21B43/30E21B7/00F24T10/20Y02E10/10F24T2010/53
Inventor 高亚楠王圣程常雪云张玉栋郭鹏
Owner CHINA UNIV OF MINING & TECH