Vegetable oil bitumen cationic amide resin with dual functions of anti-swelling and sand control

Abstract

The invention discloses a vegetable oil pitch cationic amide resin. The preparation method is as follows: (1) vegetable oil pitch and diamine are reacted under catalyst and nitrogen protection conditions at 90°C and normal pressure for 2.0 hours; the temperature is raised to 200°C, React for 2 hours under a pressure of 1.5MPa; within 2 hours, reduce the pressure in the reactor to normal pressure, then vacuum to -1.0MPa, and carry out a decompression reaction for 1 hour to obtain an amide resin; (2) Dissolve the vegetable oil pitch amide resin In xylene, excess methyl iodide or ethyl iodide or ethyl chloride or bromopropane is added dropwise, and the reaction is stirred at 90°C; the product is washed with acetone, and the solvent is evaporated to obtain vegetable oil pitch cationic amide resin. The vegetable oil bitumen cationic amide resin of the invention has dual functions of preventing swelling and controlling sand, and can be used as an anti-swelling sand control agent, which can effectively solve the problem of rapid decline of oil well productivity in high argillaceous loose sandstone oil reservoirs, has great popularization and application value, and has great applicability. powerful.

Description

technical field [0001] The invention relates to a vegetable oil pitch cationic amide resin with dual functions of preventing swelling and controlling sand, belonging to the field of polymer materials and the field of petroleum engineering. Background technique [0002] my country's high argillaceous unconsolidated sandstone reservoirs are rich in geological reserves. Due to the high shale and fine silty sand in such reservoirs plugging around the wellbore of the reservoir and the sand-controlling filling layers and screens, the productivity of oil wells after sand-controlling is significantly reduced in a short period of time. The main reason is that the high shale and the expansion and migration of silty sand in the reservoir lead to a significant decrease in reservoir permeability. It can be seen that effectively controlling particle expansion and migration in high argillaceous unconsolidated sandstone reservoirs is the key to prolonging oil well productivity and improvin...

AI Technical Summary

Problems solved by technology

[0003] Due to the limitation of structure and performance, the cationic polymer sand suppressant widely used in the sand control filling process can no longer meet the requirements of the current large pump extraction, long-term sand control and acidification for the control of particle migration. The main reasons are as follows: 1. The cationic polymer sand inhibitor is water-soluble and will dissolve into the formation water again with the prolongation of the production time. The effective components remaining on the surface wall of the pores will be denatured and broken due to the influence of formation salinity and shearing, and the decline will rapidly lead to The sand suppression performance drops sharply; second, the cationic polymer remaining in the pores and the surface walls of the particles only relies on electrostatic adsorption and hydrogen bonding, so the sand suppression performance is weak, and the erosion resistance displacement is only 900ml / h. Currently, the best molecular membrane suppression The standard index of sand agent is scouring resistance displacement of 1800ml / h, sand content <0.05g / L; third, improper use of cationic polymers in medium and low permeability reservoirs will cause damage to the reservoirs

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