Nanometer foam acid, and preparation method and application method thereof

Abstract

The invention discloses a nanometer foam acid, and belongs to the technical field of slow acidification of oil and gas wells. The nanometer foam acid includes, by mass, 0.1-1.0% of long-chain imidazoliniumbetaine, 0.1-2.0% of hydrophilic nano-silica, 0.5-2.0% of a corrosion inhibitor, 0.1-1.0% of an iron ion stabilizer, 30-50% of concentrated hydrochloric acid, and the balance of water. The nanometer foam acid can effectively reduce the speed of an acid-rock reaction, increase an acidification penetration distance and realize uniform acid distribution to achieve the purpose of deep acidification, and can effectively reduce the leak-off of an acid solution and avoid damages to an oil reservoir. A preparation method of the nanometer foam acid includes the following steps: adding water and concentrated hydrochloric acid into a container, then adding the long-chain imidazoliniumbetaine, hydrophilic nano-silica, the corrosion inhibitor and the iron ion stabilizer, and performing uniform stirring to obtain the nanometer foam acid. The preparation method is simple, and raw materials used in the preparation method are easy to obtain. An application method of the nanometer foam acid is characterized in that when the foam acid is used, nitrogen is introduced to the foam acid, the foam acid is stirred and foam, and the foamed foam acid is constructed. The application method is simple to operate, and the foam acid is convenient to use.

Description

technical field [0001] The invention belongs to the technical field of slow acidification of oil and gas wells, and in particular relates to a nano foam acid and its preparation method and use method. Background technique [0002] Acid fracturing stimulation technology is one of the leading technologies for increasing and stabilizing production of carbonate reservoir development wells, and has become an indispensable and important means for exploration wells to discover oil and gas or proven reserves. [0003] By optimizing the performance of the acid system, increasing the acidizing penetration distance to achieve deep acidizing and further reducing formation damage (polymers, solid phase insolubles, acid slag), improving the acidizing effect is the current key research direction of acidizing fracturing. An excellent acid liquid system should first have the ability to control the H in the liquid phase + The ability to diffuse to the rock surface to reduce the acid-rock rea...

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Problems solved by technology

The acid fluid loss is mainly caused by the acid fluid entering the high-permeability layer and formation fractures, causing the acid fluid to leak and be consumed quickly, so that there is not enough active acid entering the low-permeability formation, so that the effective distance of the acid fluid is greatly reduced, and it cannot be realized. Purpose of deep penetrating acid fracturing

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