Non-discharge plug-removing stick-releasing integrated working fluid and process for ternary compound combination flooding oil well

Abstract

The invention relates to non-discharge plug-removing stick-releasing integrated working fluid and process for a ternary compound combination flooding oil well. The problems that in an existing process, the utilization rate of medicaments is low, the overall cost is high, the construction time is long, and reaction residual liquid needs to be discharged are mainly solved. The non-discharge plug-removing stick-releasing integrated working fluid is characterized by being prepared from a scale clearing agent and a protective agent, and the scale clearing agent is prepared from the components in percentage by weight: 5%-7% of hydrochloric acid, 3%-5% of solid nitric acid, 0.3%-0.5% of alkylphenol ethoxylates, 1.0%-2.0% of triethanolamine, 0.5%-1.0% of imidazoline-ammonium-salt corrosion inhibitor and 90.2%-84.5% of water; the protective agent is prepared from the components in percentage by weight: 3.0%-5.0% of sodium hydroxide, 0.5%-1.0% of ethylenediaminetetraacetic acid disodium salt, 0.5%-1.0% of nonionic demulsifier SP169 and 96.0%-93.0% of water. The invention further provides a non-discharge plug-removing stick-releasing integrated process for the ternary compound combination flooding oil well. The non-discharge plug-removing stick-releasing integrated working fluid and process have the advantages of high efficiency of scale clearing and plug removing, low cost, safety and environmental protection.

Description

Technical field: [0001] The present invention relates to a scale removal and blockage removal agent system in the field of oil recovery, especially a scale removal and blockage removal agent system suitable for ASP flooding. The integrated process of efflux and blockage removal. Background technique: [0002] Field tests show that ASP flooding can increase the recovery rate by 20 percentage points compared with water flooding, and it is an important replacement technology for the sustainable development of high water-cut oilfields. Field tests show that the production end of ASP flooding is severely scaled, and the scale of downhole mechanical mining equipment causes oil wells to be stuck and the pump stops production. It is an effective means to ensure the normal operation of mechanical recovery wells. However, due to the strong acidity and strong corrosiveness of the residual liquid in the descaling and blocking removal reaction; high salinity and strong electrical condu...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the problems in the background technology that unblocking and unblocking are independent measures, and there are problems such as low medicament utilization rate, high overall cost, long construction time, and the need to discharge the residual liquid of the reaction, etc., and provides a method suitable for three It is an integrated working fluid free from external drainage, plugging and jamming, which is composed of two parts: cleaning and blocking agent and protective agent. The cleaning and blocking agent can effectively remove the scale in downhole equipment, blast holes and formations near wellbore. Increase the production of oil wells; the protective agent is used to change the properties of the residual liquid after scale cleaning and plugging removal, so as to meet the normal separation of the produced liquid in the oil-water separator

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