Well group type heat carrier heating pyrolysis mining process for deep coal stratum
A technology of pyrolysis and well group, applied in the fields of fluid extraction, underground mining, coal gasification, etc., can solve the problems of high energy consumption, difficult temperature, and difficulty in guaranteeing development benefits, and achieve the effect of rich resources and low-carbon development and utilization
Pending Publication Date: 2022-07-22
王柱军
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Problems solved by technology
In the actual production process, it is difficult to control the temperature of the coal seam by injecting water from the water injection well / extraction well, and from the temperature field of more than 1000 °C in the coal seam at the bottom of the injection well to 350 °C at the bottom of the production well, the pyrolysis of coal is difficult. It is very uneven, the utilization rate of coal is not high, and a large amount of carbon dioxide and polluted water will be produced at the same time. It is an underground gasification process including a pyrolysis process, which consumes a lot of energy and the quality of the output product is not good. ensure
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Embodiment 1
[0028] Example 1, as Figure 1 to Figure 3 As shown, a deep coal formation well group heat carrier heating and pyrolysis mining technology, the specific steps are as follows:
[0029] (1) Deploy and implement the coal seam horizontal well group in the coal seam of the selected pyrolysis target area, and set the injection and production wellheads of the two adjacent wells opposite to each other;
[0030] (2) After the construction of the horizontal well group is completed, use supercritical carbon dioxide or liquid carbon dioxide to fracturing the coal seam controlled by the horizontal well;
[0031] (3) The high temperature heat carrier gas is injected into the transformed coal seam for pyrolysis mining of the coal seam.
[0032] Further, in the step (1), the well group is composed of "U"-shaped wells with parallel horizontal sections, the well spacing of the horizontal well group is 20-50 meters, the length of the horizontal section of the horizontal well is less than 1000 m...
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The invention discloses a deep coal stratum well group type heat carrier heating pyrolysis mining process which comprises the following specific steps: (1) deploying and implementing a coal seam horizontal well group in a selected pyrolysis target area coal seam, and arranging injection and production well mouths of two adjacent wells oppositely; (2) after construction of the horizontal well group is completed, supercritical carbon dioxide or liquid carbon dioxide is adopted to conduct fracturing transformation on a coal seam controlled by the horizontal well; and (3) high-temperature heat carrier gas is injected into the transformed coal seam to conduct pyrolysis mining on the coal seam. According to the process method provided by the invention, the specific process measures of each step are relatively mature technologies, and particularly aiming at the structural characteristics and physical properties of the deep coal and the condition requirements of coal pyrolysis, the smooth implementation of the underground in-situ pyrolysis process of the deep coal is ensured through reasonable well spacing, targeted fracturing transformation and adoption of high-pressure heat carrier gas; deep coal resources in China are rich, and the deep coal is subjected to clean and low-carbon development and utilization through an effective deep coal in-situ pyrolysis technology.
Description
technical field [0001] The invention relates to the technical field of coal pyrolysis mining, in particular to a deep coal formation well group heat carrier heating and pyrolysis mining process. Background technique [0002] Coal is an important fossil energy, especially in China's energy structure. At present, coal mining is generally carried out by open-pit or underground mining. Whether it is open-pit or underground mining, there are serious problems. At the same time, due to the constraints of geological conditions and development costs, the mining depth of coal is generally within one kilometer, which makes it difficult to develop and utilize rich deep coal resources. In order to overcome the environmental protection and safety problems existing in conventional coal mining methods, realize the clean mining and utilization of coal resources, and realize the development and utilization of deep coal resources, people have carried out research on related technologies for a ...
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IPC IPC(8): E21B43/295E21B43/26E21B43/30E21B43/241
CPCE21B43/295E21B43/2605E21B43/305E21B43/241
Inventor 王柱军
Owner 王柱军