Ocean non-diagenetic gas hydrate reservoir mining system and mining process thereof

Abstract

The invention discloses an ocean non-diagenetic gas hydrate reservoir mining system. The ocean non-diagenetic gas hydrate reservoir mining system comprises a drilling and production platform, a mine channel and a main production channel, wherein the two sides of the main production channel are provided with excavation roadways which communicate with the main production channel; the main production channel is used for mining through mining equipment; the excavation roadways are mined through the mining equipment, and are backfilled with backfilling equipment. The invention further discloses a mining process for the ocean non-diagenetic gas hydrate reservoir mining system. The process comprises the following steps: building the mine channel, and building the main production channel; mounting the mining equipment and the backfilling equipment; mining hydrate ore bodies through separate roadways, performing secondary smashing and decomposing, and conveying separated natural gas to the drilling and production platform; mixing residual slurry with carbon dioxide, preparing a solid carbon dioxide hydrate, and backfilling to emptied roadways; repeating the previous steps circularly until mining of all producing layers is finished. The ocean non-diagenetic gas hydrate reservoir mining system and the mining process have the beneficial effects of keeping a seabed geologic structure stable, and avoiding possible risks such as seabed sedimentation, collapse and landslide caused by the conventional mining method.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas resource development, in particular to a marine non-diagenetic natural gas hydrate reservoir exploitation system and its exploitation process. Background technique [0002] Due to its high energy density and high efficiency, natural gas hydrate is a clean energy source, and the reserves of marine resources are extremely large, especially the marine non-diagenetic gas hydrate reservoirs are particularly rich. Therefore, the world has taken it as an important research direction for energy development. And it has invested heavily in scientific and technological research in exploration and development. This has been clearly stated in the key areas of the "National Medium and Long-Term Science and Technology Development Plan (2006-2020)" that "gas hydrate technology is a frontier technology field". [0003] The so-called non-diagenetic gas hydrate refers to: when the solid gas hydra...

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Problems solved by technology

Although this method can effectively avoid a large amount of decomposition, gasification and free release of weakly cemented natural gas hydrates in the deep seabed and shallow layers, and avoid geological disasters such as submarine landslides to a certain extent, in long-term large-scale mining, Especially in the exploitation of non-diagenetic natural gas hydrate reservoirs in the middle and shallow layers of the seabed, the channels formed during the mining process will also evacuate the geological structure, resulting in instability of the seabed strata, resulting in seabed subsidence, collapse, and submarine landslides, etc. Geological disaster

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