Natural gas hydrate compound exploitation method

Abstract

The invention discloses a natural gas hydrate compound exploitation method. The natural gas hydrate compound exploitation method comprises the following steps that an exploited well, an injection wellA and an injection well B are arranged at a stratum position of a natural gas hydrate to be exploited, and the injection well A and an injection well B are arranged on the two sides of the exploitedwell; a solid-state crushing drill rig and auxiliary equipment are lowered into a natural gas hydrate storage layer through the injection well B, after the storage layer is drilled, a drill hole is parallel to a horizontal line to continue to drill to crush the storage layer; the exploited well is closed, a carbon dioxide control platform is controlled, and carbon dioxide is injected into the natural gas hydrate storage layer through the injection well A; a drilling liquid control platform is controlled, and drilling liquid is injected into the natural gas hydrate storage layer through the injection well B; and the exploited well is opened, and natural gas generated in the storage layer is extracted to an offshore platform. According to the natural gas hydrate compound exploitation method,the advantage of good stability of the carbon dioxide hydrate is used, the stability of the stratum is ensured, geological disasters and mass decomposition of the hydrate are avoided, and meanwhile,the yield of the natural gas hydrate is effectively improved through favorable reaction conditions provided by the drilling liquid.

Description

technical field [0001] The invention relates to a method for compound exploitation of natural gas hydrate, which belongs to the technical field of natural gas hydrate exploitation. Background technique [0002] Gas hydrate is an ice-like solid formed by natural gas and water under certain temperature and pressure conditions, commonly known as combustible ice, which is mainly distributed in the sediments at 0-1100m below the seabed on the continental margin. Since natural gas hydrate has the characteristics of wide distribution, huge reserves, and high energy density, it is an alternative energy source with great potential after shale gas, tight gas, and coalbed methane, so it has broad development prospects. [0003] At present, the mining methods of natural gas hydrate mainly include: heat injection mining method, decompression mining method, chemical reagent injection mining method, solid-state fluidization mining method, etc. It is very difficult to mine hydrates, and na...

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Problems solved by technology

The carbon dioxide replacement method can not only keep the formation stable but also fix carbon dioxide into the natural gas hydrate formation, which is beneficial to alleviate the greenhouse effect. Therefore, the application of carbon dioxide in the development of natural gas hydrate has far-reaching implications; however, the carbon dioxide replacement reaction has the disadvantages of slowness and low replacement efficiency. , is not easy to be widely used, and has become an urgent problem restricting the safe and efficient exploitation of natural gas hydrate

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