High-recovery-ratio tertiary oil recovery displacement agent

Abstract

The invention discloses a high-recovery-ratio tertiary oil recovery displacement agent which comprises the following raw materials in parts by weight: 1-2 parts of polyacrylamide, 0.4-0.6 part of modified nano silicon dioxide, 6-8 parts of a surfactant, 0.5-1 part of sodium carbonate and 100-150 parts of water. By compounding the modified nano silicon dioxide with the proper surfactant, the compatibility of the two-phase interface is improved, so that the dispersed phase is not easy to condense, the stability of the emulsion is improved, the capillary resistance is reduced, the oil-water interfacial tension is greatly reduced, and the recovery ratio is improved. Furthermore, through mutual cooperation of the other substances, the temperature resistance, the salt resistance and the recoveryratio of the tertiary oil recovery oil displacement agent are further improved.

Description

technical field

[0001] The invention relates to the technical field of oil displacement agents, in particular to an oil displacement agent for high oil recovery tertiary recovery. Background technique

[0002] The oil extraction process can be divided into primary oil recovery, secondary oil recovery and tertiary oil recovery. Both primary and secondary oil recovery are recovered through physical methods, and primary oil recovery and secondary oil recovery can only recover about one-third of the crude oil reserves. Tertiary oil recovery is the only way to greatly enhance oil recovery.

[0003] The use of chemical substances to improve the performance of oil, gas, water and rocks to extract more oil is called tertiary oil recovery. Oil displacement agent is an important means to enhance oil recovery in tertiary oil recovery. Oil displacement agents can be divided into polymer flooding, alkali flooding, surfactant flooding, and composite flooding. Among them, composite flo...