Vegetable oil asphalt cationic amide resin with dual functions of swelling prevention and sand control

Abstract

The invention discloses a vegetable oil asphalt cationic amide resin. A preparation method comprises the following steps: (1) enabling vegetable oil asphalt and a diamine to react for 2.0 hours at 90DEG C and at normal pressure in the presence of a catalyst and under the protection of nitrogen; raising the temperature to 200 DEG C, and reacting for 2 hours under the pressure of 1.5 MPa; reducingthe pressure in a reaction kettle to normal pressure within 2 hours, vacuumizing to -1.0 MPa, and carrying out reduced pressure reaction for 1 hour to obtain an amide resin; (2) dissolving vegetable oil asphalt amide resin in xylene, dropwise adding excessive methyl iodide or iodoethane or chloroethane or bromopropane, and stirring for reaction at 90 DEG C; and cleaning a product with acetone, andevaporating to remove the solvent, thereby obtaining the vegetable oil asphalt cationic amide resin. The vegetable oil asphalt cationic amide resin has dual functions of swelling prevention and sandcontrol, can be used as a swelling prevention and sand control agent, can effectively solve the problem that the oil well productivity of a high-argillaceous loose sandstone oil reservoir is rapidly reduced, and has high popularization and application values and strong applicability.

Description

technical field [0001] The invention relates to a vegetable oil asphalt cationic amide resin with dual functions of anti-swelling and sand control, belonging to the fields of polymer materials and petroleum engineering. Background technique [0002] High shale unconsolidated sandstone reservoirs in my country are rich in geological reserves. Due to the high shale and silty sand in this kind of reservoir block the surrounding wellbore of the reservoir and the sand control packing layer and screen pipe, the productivity of the oil well after sand control will drop significantly in a short period of time. The main reason is that the expansion and migration of high-shale and silty sand in the reservoir lead to a sharp drop in reservoir permeability. It can be seen that effectively controlling the expansion and migration of particles in high-shale unconsolidated sandstone reservoirs is the key to prolonging oil well productivity and improving the effective period of sand control...

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

Images