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 a non-ionic water-soluble monomer, an ionic water-solublemonomer, a hydrophobic monomer and a functional monomer into water so as to obtain a monomer mixed solution; adjusting the pH value of the monomer mixed solution to 2-6, mixing the monomer mixed solution, an aqueous solution or dispersion solution of a branched polysaccharide polymer and a nano-clay dispersion solution to obtain a mixed solution, adding an initiator into the mixed solution in a protective atmosphere, and carrying out a reaction at 30-50 DEG C for 3-12 h to obtain a gel base solution; and diluting the gel base solution, adding a cross-linking agent, adjusting a pH value to 4-6,and conducting standing at 35-80 DEG C for 4-12 hours to obtain the gel plugging material. The gel plugging material has good interface adhesive force and compression strength, can be applied to prevention and treatment of oil and gas channeling in the construction process oil and gas wells, and effectively guarantees exploitation efficiency.

Description

Technical field [0001] The present invention relates to a gel blockage material, and more particularly to a gel seal material and a preparation method thereof, which is a field of chemical engineering technology in oilfield. Background technique [0002] Oil and gas exploration gradually develops towards deep wells, high temperature wells and complex scriptures, often have a complex accident in drilling. Among them, well drain and oil and gas rhabbing are the complexity of common underground in drilling operations. [0003] During the drilling, well, testing various wells, various working fluids penetrate into the formation under differential pressure. Once the fluid drain occurs, not only the drilling time will be delayed, and the drilling fluid is not only damaged, but also damage the oil and gas layer, causing significant economic losses. Handling these well-drain problems, generally takes about 10% of the drilling cycle, and the treatment time is more than 70% of the drilling...

AI Technical Summary

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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