Water absorption resin for well repair and leaking stoppage and synthesis method thereof

Abstract

The invention relates to water absorption resin for well repair and leaking stoppage. The water absorption resin is prepared by the following synthesis steps of: a, mixing 10 to 15 percent of 2-acrylamide-2-methylpropanesulfonic acid, 30 to 45 percent of acrylamide, 0.2 to 0.5 percent of N,N-methylenebisacrylamide and deionized water in a weight ratio with stirring to form a mixture, wherein the stirring time is 5 to 10 minutes and the stirring temperature is 30 to 50 DEG C; b, putting the prepared mixture into a polymerization reaction kettle, stirring the mixture, introducing nitrogen for 30 minutes to displace air in the polymerization reaction kettle, simultaneously heating the polymerization reaction kettle to the temperature of between 40 and 50 DEG C, then adding 0.03 to 0.08 weight percent of persulfate initiator into the mixture, performing polymerization reaction on the mixture to generate the water absorption resin, and preserving heat for at least 6 hours after the polymerization reaction starts; and c, drying the prepared water absorption resin at the temperature of not more than 120 DEG C for 24 hours till complete drying, and crushing the dried water absorption resin into granules with a diameter of 0.5 to 40 millimeters to obtain the water absorption resin for well repair and leaking stoppage.

Description

field of invention [0001] The invention relates to a water-absorbing resin, in particular to a water-absorbing resin for well repair and plugging, and also relates to a synthesis method of the water-absorbing resin for well repair and plugging. Background technique [0002] During the production process of the oilfield, due to the water injection scour or formation fluid scour, the formation cement is easily damaged, which further increases the formation permeability and pore throat radius, forming "large pores" and high permeability bands in the formation. Workover fluid leakage often occurs during well operations. The loss of workover fluid not only increases the amount of workover fluid used, resulting in the failure of workover operations, but also causes clay swelling in the reservoir, and velocity-sensitive sandstone reservoirs with poor diagenesis, non-cementation and weak cementation. Formation pollution such as particulate migration and changes in reservoir rock we...

AI Technical Summary

Problems solved by technology

At present, the existing acrylic water-absorbing resins have poor temperature and salt resistance, chemical stability and anti-aging properties under oilfield reservoir conditions, and cannot meet the needs of existing oilfield reservoir conditions.

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