Method for jointly exploiting hydrates and hermetically storing carbon dioxide by aid of quicklime and carbon dioxide injection processes

Abstract

The invention provides a method for jointly exploiting hydrates and hermetically storing carbon dioxide by the aid of quicklime and carbon dioxide injection processes. The method includes selecting hydrate occurrence regions as target regions and drilling quicklime and carbon dioxide injection wells and gas production wells; injecting quicklime into hydrate layers from the quicklime and carbon dioxide injection wells to form quicklime filling regions; completely carrying out reaction on the quicklime and water in the hydrate layers and then injecting the carbon dioxide from the quicklime and carbon dioxide injection wells; controlling outlet pressures of the gas production wells to allow gas production pressures to be higher than carbon dioxide and hydrate phase-balance pressures corresponding to the temperatures of the hydrate layers and lower than methane and hydrate phase-balance pressures corresponding to the temperatures of the hydrate layers; collecting methane gas at well mouths of the gas production wells. The method has the advantages that the hydrates can be safely and efficiently exploited, environmental problems such as decrease of the strength of existing hydrate layers and instability of strata in natural gas hydrate exploitation procedures can be effectively solved, and the purposes of hermetically storing the carbon dioxide and abating greenhouse effects can be achieved.

Description

technical field [0001] The invention relates to a combined method of quicklime injection and carbon dioxide gas hydrate mining and carbon dioxide sequestration, which belongs to the field of new energy and new materials. Background technique [0002] With the development of society and economy, the total energy consumption continues to increase, traditional energy sources are decreasing day by day, and the competition for energy resources among countries is becoming increasingly fierce. Countries gradually begin to pay attention to the development and utilization of new energy sources. Among them, natural gas hydrate has huge resource potential. In recent years, many countries that have studied natural gas hydrate earlier have carried out further research on its mining technology and environmental problems faced by mining. Traditional natural gas hydrate exploitation methods include heat injection method, depressurization method and chemical reagent injection method, but al...

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