System and method for achieving batched drilling and rolling type well group exploitation on natural gas hydrate

Abstract

The invention provides a system and method for achieving batched drilling and rolling type well group exploitation on natural gas hydrate. The system comprises a collection device and a data control device. The method comprises the steps that (1) recognition of a natural gas hydrate enrichment area and methane reserve estimation in a natural gas hydrate reservoir are carried out, then economy evaluation is carried out, the exploitation block is selected, and the number of drilling wells is confirmed; (2) double horizontal well open-circuit circulating batched drilling is carried out; (3) fracturing and slotting production increase and sand prevention production stabilization are carried out; and (4) rolling type well group exploitation is carried out, the well group exploitation manner with multiple well sets arranged side by side is adopted, an underwater exploitation pipe network shared by multiple well sets is built, the mode of achieving exploitation and drilling at the same time is adopted, and rolling type exploitation is achieved. By means of the method, the natural gas hydrate drilling and exploitation cost can be effectively reduced, the exploitation yield of natural gas hydrate is effectively improved and stabilized, the exploitation age limit is prolonged, the economic benefits of natural gas hydrate exploitation can be improved easily, and guarantees are provided for achieving commercial exploitation of natural gas hydrate.

Description

technical field [0001] The invention relates to a system and method for exploiting natural gas hydrate by batch drilling and rolling well group, and belongs to the technical field of natural gas hydrate exploitation in sea areas. Background technique [0002] The world's energy structure is shifting towards low carbonization, and the proportion of natural gas in the world's primary energy is increasing year by year. The International Energy Agency predicts that natural gas will replace coal in 2030 and become the second largest energy source after oil. The carbon equivalent of global natural gas hydrate is about twice that of other fossil energy sources combined, and it is likely to be an important source of natural gas in the future. The amount of natural gas hydrate resources in my country's sea area is about 80 billion tons of oil equivalent, which has broad development prospects. Accelerating the realization of its commercial exploitation is the key to seize the strateg...

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies of the existing technology, especially the problems of low output, short duration and poor economy in the existing natural gas hydrate exploitation process, the present invention proposes a system and method for exploiting natural gas hydrate by batch drilling and rolling well group

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