Micro-heterogeneous profile control and oil displacement agent, and preparation method thereof

Abstract

The invention provides a micro-heterogeneous profile control and oil displacement agent, and a preparation method thereof. The micro-heterogeneous profile control and oil displacement agent is prepared through polymerization reaction of a heat-resistant and salt-tolerant monomer, a main drug, an initiator, a cross-linker, an emulsifier, an additive, a dispersion medium and water, wherein the weight percentage of the heat-resistant and salt-tolerant monomer is 1-5%, the weight percentage of the main drug is 10-30%, the weight percentage of the initiator is 0.1-0.3%, the weight percentage of thecross-linker is 0.05-0.1%, the weight percentage of the emulsifier is 10-12%, the weight percentage of the dispersion medium is 45-65%, the weight percentage of the additive is 0.1-1%, and the wateraccounts for the remaining percentage. The micro-heterogeneous profile control and oil displacement agent has good expansion retarding effects, a large expansion multiple, excellent heat resistance and salt tolerance, high chemical stability and high injectivity; and when used in a reservoir, the micro-heterogeneous profile control and oil displacement agent can achieve deep migration and retention, enlarge the seepage resistance of a large pore path or a high-permeable strip, increase the injection pressure, drive a subsequent oil displacement agent to divert and enter a medium-low permeablelayer, achieve a larger swept volume and a higher recovery ratio, and improve the recovery ratio of a high water-cut oilfield.

Description

technical field The invention relates to a microscopic heterogeneous flood control agent and a preparation method thereof. Background technique At present, most oilfields at home and abroad adopt the water injection development method. Due to the heterogeneity of the reservoir itself and the scouring and destruction of long-term high-intensity injection water, the permeability of the high-permeability layer of the reservoir and the heterogeneity of the reservoir are further increased, resulting in injection. Water or oil-displacing agent rushes along the dominant channel, forming inefficient or ineffective circulation, which ultimately reduces the wave sum efficiency and recovery factor of low-permeability layers in the reservoir. Therefore, deep liquid flow diversion technology in high water-cut reservoirs has become a key technology for enhancing oil recovery. Compared with the polymer solution, the granular microscopic heterogeneous control and flooding agent has the see...

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Problems solved by technology

The expansion multiple of existing micro-heterogeneous control and drive agents is generally around 5, which is still far from the actual demand of mine production. It is urgent to develop micro-heterogeneous control and drive agents with longer expansion delay time and larger expansion multiples

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