Long-arm synergistic exploitation method for deep-sea natural gas hydrate
A mining method and natural gas technology, which are applied in the fields of fluid extraction, earth-moving drilling, climate sustainability, etc., can solve the problems of low efficiency of natural gas hydrate extraction in sea areas, and ensure the gas production efficiency of a single well, with clear and extensive design ideas. The effect of promoting and applying value
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Embodiment 1
[0057] Analyze the formation permeability coefficient, formation temperature and particle gradation geological parameters in the area where the natural gas hydrate is located, determine the height of the seawater layer, the location suitable for building the well 3, the thickness of the overburden layer 4, and the symmetrical length range of the long-arm mining area with respect to the shaft 3; specifically The data is that the seawater depth is 800m, the overburden thickness is 200m, and the formation permeability coefficient is 1.2×10 -6 cm / s, formation pressure 12MPa, formation temperature 4°C, formation particle average particle size 100μm; vertical well 3 diameter 2m, upper recovery horizontal well 5 and lower energy supply horizontal well 7 diameter 0.5m, horizontal drilling length 20m;
[0058] Build the offshore mining platform 1 and shaft 3 according to the above parameters; build the shaft 3 to penetrate the overburden layer 4 to the height where the overburden layer ...
Embodiment 2
[0065] The difference between this embodiment and Embodiment 1 is that the long-arm mining area is mined by the mining device in the first mining shaft 6; the mining direction is determined to be retreating mining, and the mining method is decompression mining; the specific mining steps are as follows: In the area where the vertical shaft 3 is placed in the natural gas hydrate reservoir 8, the upper recovery horizontal well 5 and the lower energy supply horizontal well 7 are first built along the long arm production area;
[0066] Further, due to the retreat type mining, the first production shaft 6 is first built on both sides away from the shaft 3 and close to the edge of the long-arm mining area, and the first production shaft 6 and the main shaft 3 are formed through the lower energy supply horizontal shaft 7 The depressurization is carried out within the scope of the decompression, and the natural gas produced by decomposition is transported to the offshore mining platform...
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