Method for exploiting natural gas hydrate
A hydrate and natural gas technology, applied in the fields of fluid extraction, earthwork drilling, climate sustainability, etc., can solve the problems of potential geological safety hazards, high gas injection cost, low gas injection-production ratio, etc. Secondary growth and icing behavior, enhanced gas mass transfer behavior, and reduced sediment migration effects
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Embodiment 1
[0038] Such as figure 1 As shown, the present invention provides a method for exploiting natural gas hydrate, comprising the steps of:
[0039] S1: Establish gas injection wells and production wells in areas where natural gas hydrates are to be exploited;
[0040] S2: Determine the injection pressure of the injection well according to the formation permeability of the gas hydrate to-be-produced area and the well spacing between the gas injection well and the production well;
[0041] S3: According to the injection pressure, open the gas injection well and inject gas containing carbon dioxide into the natural gas hydrate reservoir in the area where the natural gas hydrate is to be produced to displace the pore fluid of the natural gas hydrate reservoir, the gas the injection well, the gas hydrate reservoir and the production well are in communication;
[0042] S4: collecting produced gas from the production well and monitoring the composition of the produced gas;
[0043] S5...
Embodiment 2
[0081] The present embodiment has carried out physical simulation experiment to the present invention, and implementation experiment specifically comprises the following steps:
[0082] Such as Figure 4 As shown, a methane hydrate sample similar to marine natural gas hydrate is prepared in a three-dimensional model, and a gas injection well 2 and a production well 3 are symmetrically distributed at both ends; the parameters in the figure are only exemplary and do not represent the present invention limits.
[0083] The natural gas hydrate reservoir pressure is reduced by conventional depressurization production method, and the pressure drop range is 1.5MPa;
[0084] A mixture of carbon dioxide and nitrogen is injected into the sample from gas injection well 2, where the concentration of carbon dioxide is 56%, and the gas produced by production well 3 is a mixed gas containing carbon dioxide, nitrogen and methane, and the gas chromatograph is used to measure the composition o...
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