A low-corrosion self-generating energized fracturing fluid and its preparation method

Abstract

The invention provides a low-corrosion self-generating energized fracturing fluid and a preparation method thereof. The fracturing fluid of the present invention is prepared by mixing an air generator solution and an initiator solution; 0.2-1 part of joint agent, 0.02-0.1 part of gel breaker, 0.05-0.2 part of bactericide, 25-43 parts of water; the initiator solution includes the following raw materials in parts by weight: 0.02-0.1 part of drag reducing agent, 3 parts of methyl formate -20 parts, 1.5-10 parts of ammonium chloride, 0.5-1.2 parts of methanol, 21-45 parts of water. The fracturing fluid of the present invention has the characteristics of self-gasification, low corrosion, no reaction or slight reaction at normal temperature, good stability, easy control of reaction, rapid response at formation temperature, full and effective use of fracturing fluid, no harmful gas generation, safety and environmental protection, And it has the advantages of little impact on the reservoir near the wellbore.

Description

technical field [0001] The invention relates to a low-corrosion self-generating energized fracturing fluid and a preparation method thereof, belonging to the technical field of oil production engineering. Background technique [0002] Conventional water-based fracturing fluids are the main force in fracturing fluids because of their low cost and easy preparation. However, for special reservoirs such as low pressure and water-sensitive reservoirs, the amount of retained fluid is large due to insufficient formation energy, which is likely to cause formation failure. Secondary damage leads to unsatisfactory development results. In order to increase the application range of water-based fracturing fluid and improve the application effect of water-based fracturing fluid, compressible CO 2 , N 2 Gases such as LPG and LPG are dispersed into the water-based fracturing fluid to form ground energized foam fracturing fluid. 2 The corrosion of surface equipment and pipe strings is lar...

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Problems solved by technology

Chinese patent document CN106634922A discloses a self-generating foam oil displacement agent liquid and its application and method for increasing production and injection; the self-generating foam oil displacement agent includes an air-generating agent and an air-releasing agent, and the air-generating agent has a mass concentration of 8%. ~15% carbonate or bicarbonate aqueous solution, the gas system has problems such as ground instability and incomplete reaction

Chinese patent document CN109762549A discloses a high-efficiency self-produced gas foam fracturing fluid and a construction method, using hypochlorous acid and sodium azide as gas agents, but sodium azide is a highly toxic substance that is easy to explode, and hypochlorous acid Extremely unstable, easy to decompose when heated

Chinese patent documents CN102627960A, CN103265938A, CN102086388A, and CN104790933A provide a self-generating foam fracturing fluid and a foam-like fracturing system, all of which use sodium nitrite and ammonium chloride to react under acidic conditions to release a large amount of gas; but This reaction not only requires an acidic environment, but also produces corrosive by-products such as nitric oxide, etc., which are highly corrosive and require high equipment; the reaction occurs at room temperature, and the reaction is difficult to control, so that the fracturing fluid cannot be fully utilized. At the same time, acidic substances will affect the reservoir near the wellbore; and, in the process of use, explosion-proof issues need to be considered, and there are potential safety hazards

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