Shuangl Well Structure and Method for Exploiting Marine Hydrate Reservoir by Fracturing

Abstract

The invention relates to the field of exploiting marine hydrate reservoirs, and discloses a double-L well structure and method for exploiting marine hydrate reservoirs by fracturing, according to thedouble-L well structure, the carbon dioxide fracturing fluid is injected into the region between a first fracturing well and a second fracturing well arranged in the hydrate layer, the upper part andthe lower part are both a hydrate generation fracture, the formed fracture can effectively improve the permeability of the hydrate layer, the carbon dioxide fracturing fluid penetrates into the fracture, the decomposition of the natural gas hydrate is promoted, the structure has the advantages of improving the permeability of the reservoirs, fast mining speed, small energy loss, and high efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of exploitation of marine hydrate reservoirs, in particular to a double-L well structure and method for utilizing fracturing to exploit marine hydrate reservoirs. Background technique [0002] Natural gas hydrate has the characteristics of rich reserves, wide distribution, high energy density, and relatively clean after combustion. Various countries regard it as an environmentally friendly alternative to traditional fossil energy in the future. Studies have shown that nearly 90% of the world's oceans meet the conditions for the occurrence of gas hydrates. The rational development and utilization of marine hydrate resources is of great significance to alleviate the energy crisis and enrich the energy structure. [0003] According to the phase equilibrium properties of hydrates, natural gas hydrate production methods including heat shock method, depressurization method, chemical agent injection method and car...

AI Technical Summary

Problems solved by technology

However, since gas hydrate usually occurs in silt, fine silt and mud shale, and its own ice crystal form will block the flow channels, the permeability of gas hydrate reservoirs is often poor. The heat transfer and conductivity are greatly limited, and there are problems such as slow mining speed, long cycle, large energy loss, and low efficiency.

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