Plugging agent synergist, gel containing same as well as preparation method and application of gel

Abstract

The invention discloses a plugging agent synergist, and belongs to the field of chemical engineering. The plugging agent synergist comprises the following components by weight percent: 8-10% of epoxy chloropropane, 10-15% of ammonium chloride, 20-25% of glycine betaine, 3-5% of sodium carboxymethylcellulose, and the balance of water. The gel added with the plugging agent synergist has the advantages that the gelling time is adjustable (different plugging treatment can be implemented according to different time), the gel breaking time can reach 3 months above, the applicable oil reservoir is wide in range and comprises high, medium and low permeation stratums, the applicable temperature is wide in range and is from the room temperature to 150 DEG C of an oil reservoir, and the gel can be applicable to water with different degrees of mineralization within the range from 0-100000 mg / L; therefore, a gel system can be freely applied to various aspects such as profile control, water plugging, leaking stoppage and oil displacement, and larger space is provided for the further improvement of the recovery efficiency.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a blocking agent synergist, a gel containing the blocking agent synergist and applications thereof. Background technique [0002] When the oilfield enters the middle and late stages of water injection development, affected by the heterogeneity of formation permeability and the difference in oil-water viscosity, the water cut increases year by year. Water plugging of oil wells and profile control of water injection wells have become important measures for stable production of oilfields. In recent years, the research on profile control agents at home and abroad has been in-depth, especially the research on gel water shutoff agents. [0003] In addition, gel is a high-viscosity working fluid formed by cross-linking between polymers and cross-linking agents. Whether traditional polymers and cross-linking agents can form gels after entering the formation is affected by many factors, r...

AI Technical Summary

Problems solved by technology

[0003] In addition, gel is a high-viscosity working fluid formed by cross-linking between polymers and cross-linking agents. Whether traditional polymers and cross-linking agents can form gels after entering the formation is affected by many factors, resulting in failure to perform as expected. Plan to gel, and the gel strength and gel time are affected by many factors, such as temperature, salinity, shear and other factors, which directly affect the gel gel performance

[0004] The existing gel system is not resistant to high temperature when used in the oil field, the applicable temperature range is narrow, and the gelling strength and gelling time cannot be adjusted according to the needs

Images