A method for coupling reservoir production and injection with flue gas desulfurization and denitrification

Abstract

The invention belongs to the fields of flue gas purification and carbonate reservoir acidification reformation, in particular to a method for coupling flue gas desulfurization and denitrification to increase production and injection of reservoirs. In the present invention, the flue gas desulfurization and denitrification coupling method for increasing production and injection of reservoirs includes flue gas desulfurization and denitrification process and reservoir acid solution acidification process. 2 o 2 The solution is mixed evenly to prepare a solution, and the solution is sprayed into the flue gas in the opposite direction of the flue gas flow, or O 3 Mix the flue gas into the flue gas in the opposite direction of the flue gas flow, and spray the desulfurization and denitrification agent solution at the same time. When the pH of the solution system reaches 6-6.5, collect the waste liquid after the reaction as the acid liquid. This process can control air pollution and improve flue gas. Treat economic benefits and produce acid solution at low cost; the acidification process of reservoir acid solution is to inject the waste liquid obtained from flue gas desulfurization and denitrification into the carbonate reservoir at a certain flow rate, and the temperature of the reservoir makes the acid solution slowly hydrolyze into H 2 SO 4 、HNO 3 , the generated acid reacts with the reservoir to achieve the effect of increasing production and injection through acidification.

Description

technical field [0001] The invention relates to the field of flue gas purification and carbonate reservoir acidification transformation, in particular to a method for coupling flue gas desulfurization and denitrification to increase production and injection of reservoirs. Background technique [0002] flue gas contains NO x , SO x In order to control air pollution, desulfurization and denitrification need to be carried out. The important factors affecting the economics of desulfurization and denitrification technology are the operating cost and the utilization of flue gas components. For desulfurization and denitrification products, most of the existing technologies adopt the methods of discharge, accumulation and storage, which are likely to cause secondary pollution such as eutrophication of water bodies. Therefore, the utilization of the removed nitrate and sulfur needs to be studied. Chinese patent document CN102671529A by NH 3 And apatite desulfurization and denitrif...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention proposes a method for coupling reservoir production and injection with flue gas desulfurization and denitrification, that is, desulfurization and denitration agents and oxidants are used as curing agents, and desulfurization and denitrification waste liquids are enriched as acid liquids. It can not only better control environmental pollution, but also use one agent for multiple purposes, reduce the cost of carbonate reservoir acidification, realize deep acidification and increase production and injection of oil and water wells, and solve the following problems in the prior art: First, the existing desulfurization Although the denitrification process can control air pollution, the desulfurization and denitrification products cannot be effectively used, which may easily cause secondary pollution such as eutrophication of the water body; secondly, in traditional acid fracturing, the acid fluid loss is strong, and the acid rock reaction rate is too fast , the action distance is short, and the efficiency of removing blockages is low; thirdly, the existing powder acid has high cost, complicated construction, and weak alkalinity of the curing agent, so the existing powder acid still has strong corrosiveness

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