A method and device for producing hydrates by combining pressure reduction and hydraulic fracturing technology

Abstract

The invention discloses a method and a device for exploiting natural gas hydrate combined with depressurization and hydraulic fracturing technology. Through the design of double wellbore casing strings, the outer wellbore string is used to depressurize the natural gas hydrate in the reservoir, and the bottom of the inner wellbore string is used to detect and monitor the reservoir conditions. It is necessary to inject fracturing fluid into the reservoir for manual hydraulic fracturing operations to improve the permeability of the reservoir, ensure smooth fluid circulation channels and smooth gas production under pressure reduction. The method includes the following steps: constructing production wells, arranging double wellbore casing strings and related production and monitoring equipment; reducing pressure and decomposing natural gas hydrate; monitoring reservoir information and guaranteeing reservoir permeability by hydraulic fracturing technology ; gas and water collection output. The invention combines the advantages of depressurization method and hydraulic fracturing technology, and can grasp and feed back the change information of the reservoir in time while exploiting natural gas hydrate resources, so as to achieve economical, efficient and safe recovery of natural gas hydrate reservoirs. commercial mining purposes.

Description

technical field [0001] The invention relates to the exploitation technology of natural gas hydrate, in particular to a natural gas hydrate exploitation method and device combining depressurization and hydraulic fracturing technology. Background technique [0002] The problem of insufficient energy supply in my country has become increasingly prominent, and with the sustained and rapid development of the national economy, the degree of dependence on foreign oil and natural gas resources will continue to increase for a long period of time, and the regular fluctuations in international energy market prices As well as the challenges faced by energy transportation security, they will have a huge impact on the development of my country's national economy. Therefore, it is of great practical demand and strategic significance to explore other new clean alternative energy sources, ensure my country's future energy supply and energy security, and ensure the healthy development of my co...

AI Technical Summary

Problems solved by technology

[0005] So far, an economical and effective large-scale commercial exploitation of natural gas hydrate has not been formed, and it is difficult to achieve real commercial exploitation by using only one mining method in the known methods. The advantages of different methods must be combined to learn from each other. In order to achieve the purpose of economical, efficient and safe commercial exploitation of natural gas hydrate reservoirs, and benefit mankind

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