Nano-grade temperature-resisting and salt-resisting cross-linked polymer microspheres and preparation method thereof

Abstract

The invention discloses nano-grade temperature-resisting and salt-resisting cross-linked polymer microspheres and a preparation method thereof, and belongs to the technical field of polymer microspheres. The nano-grade temperature-resisting and salt-resisting cross-linked polymer microspheres are prepared from the following components in parts by weight: 40 to 48 parts of acrylamide, 15 to 20 parts of acrylic acid, 12 to 22 parts of 2-acryloylamino-2-sodium methyl propanesulfonate, 5 to 8 parts of a surfactant, 45 to 51 parts of white oil, 1.5 to 2.6 parts of a cross-linking agent, 0.6 to 1.2parts of zirconium nitrate, 6 to 9 parts of a heat-resisting agent, 5.6 to 8 parts of ammonium persulfate, 0.7to 1.3 parts of sulfur dioxide, 2 to 6 parts of a reinforcing agent, 2.2 to 3.4 parts of disodium ethylene diamine tetraacetate, 52 to 65 parts of distilled water and 8 to 10 parts of acetone. The nano-grade temperature-resisting and salt-resisting cross-linked polymer microspheres provided by the invention have excellent comprehensive performance, temperature resistance and salt resistance and a good blocking effect, and the recovery ratio of crude oil is improved.

Description

technical field [0001] The invention relates to the technical field of polymer microspheres, in particular to a nano-scale temperature-resistant and salt-resistant cross-linked polymer microsphere and a preparation method thereof. Background technique [0002] At present, as my country's oilfields enter the middle and late development stages, some oil wells enter the high water cut period, and it is difficult to control water, stabilize oil and improve oil recovery. Especially for high-temperature and high-salt oil fields, there are problems such as poor temperature resistance and salt resistance, short effective period of operation measures, and poor effect of water control and oil stabilization. These problems seriously affect oil recovery, and problems need to be solved urgently. The deep profile control effect of the existing profile control technology is not good, for example, the inorganic plugging agent is easy to precipitate and cannot enter the deep formation for pl...

AI Technical Summary

Problems solved by technology

However, the microspheres have poor heat and salt resistance and are not suitable for high-temperature and high-salt oil fields.

It has been verified that the dispersibility and stability are poor, and it is easy to deform in actual operation, resulting in precipitation and poor plugging effect, which affects the recovery of crude oil

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