Novel inorganic-organic ternary composite plugging agent for oil extraction and preparation method

Abstract

The invention relates to a novel inorganic-organic ternary composite plugging agent for oil extraction and a preparation method. The invention adopts the technical scheme that: the plugging agent is prepared by mixing 8 to 12 percent of water glass of which the modulus is 3.3, 0.1 to 0.3 percent of polyacrylamide and 0.3 to 0.8 percent of water-soluble phenolic resin and the balance of phosphoricacid and water, wherein the phosphoric acid is used for adjusting a pH value. Under the condition of overcoming short gelation time and relatively weak gelation intensity of inorganic silicic acid, inorganic-organic plural gel which has the characteristics of relatively long gelation time at the temperature of less than 70 DEG C, high gelation intensity, certain tenacity and difficult cracking isprovided and is suitable for different stratum environments.

Description

1. Technical field: [0001] The invention relates to a novel inorganic-organic ternary composite plugging agent for oil production and a preparation method thereof. 2. Background technology: [0002] At present, most domestic oil fields have entered the development stage of high water cut or extremely high water cut: liquid production increases, oil production decreases, water content exceeds 80%, even as high as 90%, and the increase of liquid production directly leads to formation Reduced energy, reduced pump efficiency of pumping wells, increased corrosion and scaling of pipelines and equipment, increased water treatment costs, and increased investment costs directly affect crude oil production and lead to a decrease in the ultimate recovery of oil layers. [0003] Water production from oil wells is a common problem in water injection (or steam injection) development of oil fields. In the process of oil field development, when the original energy of the oil layer begins t...

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Problems solved by technology

[0005] The purpose of the present invention is to address the above-mentioned defects in the prior art, to provide a new type of inorganic-organic ternary composite plugging agent for oil recovery and its preparation method, and to overcome the short gelation time and relatively weak gel strength of inorganic silicic acid In order to provide an inorganic-organic composite gel with a relatively long gel time (6-8h) and high gel strength below 70°C, and the gel has a certain toughness and is not easy to crack