A kind of gel plugging material and preparation method thereof

Abstract

The invention provides a gel plugging material and a preparation method thereof. The preparation method comprises the following steps: adding non-ionic water-soluble monomers, ionic water-soluble monomers, hydrophobic monomers, and functional monomers into water to obtain monomers Mixed solution; after adjusting the pH value of the monomer mixed solution to 2-6, the monomer mixed solution, the branched polysaccharide polymer aqueous solution or dispersion and the nanoclay dispersion are mixed to obtain a mixed solution, and under a protective atmosphere, Add an initiator to the mixed solution and react at 30-50°C for 3-12 hours to obtain a gel base solution; after diluting the gel base solution, add a cross-linking agent and adjust the pH value to 4-6. Stand still at -80°C for 4-12h to obtain the gel plugging material. The gel plugging material has good interfacial adhesion and compressive strength, and can be used to prevent oil and gas channeling during oil and gas well construction and effectively ensure production efficiency.

Description

A kind of gel plugging material and preparation method thereof technical field The present invention relates to a kind of gel blocking material, relate in particular to a kind of gel blocking material and preparation method thereof, belong to Oilfield chemical engineering technology field. Background technique Oil and gas exploration is gradually developing towards deep wells, high temperature wells and complex meridians, and there are often complex accident occurred. Among them, lost circulation and channeling of oil, gas and water are common downhole complications in drilling operations. Loss of circulation is that in drilling, cementing, and testing various downhole operations, various working fluids infiltrate under the action of differential pressure. ground phenomenon. Once a lost circulation occurs, it will not only delay drilling time, lose drilling fluid, but also damage oil and gas layers, causing serious damage. economic losses. To deal with these los...

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Problems solved by technology

Due to many geological and engineering factors, as well as long-term scour after water injection, coupled with clay expansion, particle migration and sand production in oil and gas wells, the pore structure of oil and gas reservoirs has changed greatly, and the physical properties of reservoirs have also changed. High-permeability zones or large pores are gradually formed in connected thick oil and gas layers, and even a dominant channel for channeling of injected water will be formed in the later stage, causing a large amount of injected water to circulate ineffectively along the high-permeability zone, seriously affecting the water injection development effect, resulting in only Decreased efficiency, poor construction effect, etc., which may even lead to major accidents such as blowouts that endanger construction safety and personnel lives

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