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Method for increasing production and injection of flue gas desulfurization and denitrification coupled reservoir

A technology for desulfurization and denitrification, flue gas, applied in the direction of separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of fast reaction rate of acid rock, complicated construction, weak alkalinity of curing agent, etc., and achieve economic benefits and control Effects of air pollution and cost reduction

Active Publication Date: 2021-07-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Method for increasing production and injection of flue gas desulfurization and denitrification coupled reservoir

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Embodiment 1

[0046] A method for coupling reservoir production and injection with flue gas desulfurization and denitrification, comprising the following steps:

[0047] (1) Flue gas desulfurization and denitrification process: add THEED with a mass fraction of 0.015% to 15% H 2 o 2 The mixed solution is prepared in the solution, and the volume ratio is 75:1. The mixed solution is sprayed into the flue gas in the opposite direction of the flue gas flow. When the pH of the system reaches 6.5, the waste liquid generated by desulfurization and denitrification is collected, and the waste liquid is acid.

[0048] (2) The obtained acid solution can be directly injected into the formation to increase production and injection, and the acid solution contains about 0.015% [H 2 THEED] 2+ ; The dissolution rate and corrosion rate of the acid solution are detected, and the detection basis is SY / T 5358-2002 "Reservoir Sensitivity Flow Experimental Method", and the operation steps for testing the disso...

Embodiment 2

[0051] A method for coupling reservoir production and injection with flue gas desulfurization and denitrification, comprising the following steps:

[0052] (1) Flue gas desulfurization and denitrification process: adding bipy with a mass fraction of 0.015% to 15% H 2 o 2 The mixed solution is prepared in the solution, and the volume ratio is 400:3. The mixed solution is sprayed into the flue gas in the opposite direction of the flue gas flow. When the pH of the system reaches 6.5, the waste liquid generated by desulfurization and denitrification is collected, and the waste liquid is acid.

[0053] (2) The obtained acid solution can be directly injected into the formation to increase production and injection, and the acid solution contains about 0.015% [H 2 bipy] 2+ ; According to the method in embodiment 1, the dissolution rate and corrosion rate of acid solution are detected, and the results are shown in Table 1.

Embodiment 3

[0055] A method for coupling reservoir production and injection with flue gas desulfurization and denitrification, comprising the following steps:

[0056] (1) Flue gas desulfurization and denitrification process: the O 3 Mix into the flue gas in the opposite direction of the flue gas flow, and spray 0.015% THEED, THEED and O at the same time 3 The volume ratio is 100:1. When the pH of the solution reaches 6.5, the waste liquid produced by desulfurization and denitrification is collected, which is the acid liquid.

[0057] (2) The obtained acid solution can be directly injected into the formation to increase production and injection, and the acid solution contains about 0.015% [H 2 THEED] 2+ ; According to the method in embodiment 1, the dissolution rate and corrosion rate of acid solution are detected, and the results are shown in Table 1.

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Abstract

The invention belongs to the field of flue gas purification and carbonate reservoir acidification transformation, and particularly relates to a method for increasing production and injection of a flue gas desulfurization and denitrification coupled reservoir. The method for increasing production and injection of the flue gas desulfurization and denitrification coupled reservoir comprises a flue gas desulfurization and denitrification process and a reservoir acid liquor acidification process, and the flue gas desulfurization and denitrification process comprises the following steps that a desulfurization and denitrification agent and an H2O2 solution are uniformly mixed to prepare a solution, the solution is sprayed into flue gas in a direction opposite to the flowing direction of the flue gas, or O3 is mixed into the flue gas in the direction opposite to the flowing direction of the flue gas, meanwhile, a desulfurization and denitrification agent solution is sprayed, and after the pH value of a solution system reaches 6-6.5, waste liquid obtained after reaction is collected to serve as acid liquor, the process can control atmospheric pollution, the economic benefits of flue gas treatment can be improved, and the acid liquor can be prepared at a low cost; and according to the reservoir acid liquor acidification process, waste liquor obtained through flue gas desulfurization and denitrification is injected into a carbonate reservoir at a certain flow rate, the acid liquor is slowly hydrolyzed into H2SO4 and HNO3 due to the temperature of the reservoir, generated acid reacts with the reservoir, and the effect of acidification yield increase and injection increase is achieved.

Description

technical field [0001] The invention relates to the fields of flue gas purification and carbonate reservoir acidification modification, 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 are required. The important factors affecting the economics of desulfurization and denitrification technology are firstly the operating cost and the second is the utilization of flue gas components. For desulfurization and denitrification products, the existing technology mostly adopts the method of discharge, accumulation and storage, which is likely to cause secondary pollution such as eutrophication of the water body. Therefore, the utilization of the desulfurized nitrate and sulfur remains to be studied. Chinese patent document CN102671529A passed NH 3 Desulfurization and ...

Claims

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Application Information

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IPC IPC(8): E21B43/22B01D53/60B01D53/78
CPCE21B43/16B01D53/78B01D53/60B01D2258/0283B01D2251/104B01D2251/106
Inventor 李秉霖苏玉亮李宾飞张超武守亚李东霞王文东李蕾郝永卯
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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