Composite nanometer SiO<2> pressure-lowering and injection-augmenting agent and preparation method thereof

Abstract

The invention discloses a composite nanometer SiO<2> pressure-lowering and injection-augmenting agent and a preparation method thereof and belongs to the technical field of improvement of the crude oil recovery ratio in the oilfield waterflood recovery process in the petroleum industry. The composite nanometer SiO<2> pressure-lowering and injection-augmenting agent is composed of nanometer SiO<2>, anionic surfactant, surface modification agents and active water. The composite nanometer SiO<2> pressure-lowering and injection-augmenting agent is characterized in that good heat resistance is achieved, a good pressure-lowering and injection-augmenting effect is achieved at the temperature of 120 DEG C, the technological process is simple, operation is convenient, and meanwhile the problems of reduction of the pore diameter, blocking of a pore throat and the like caused by clay swelling and scale formation can be effectively inhibited. The composite nanometer SiO<2> pressure-lowering and injection-augmenting agent can be used for pressure-lowering and injection-augmenting of a low-permeability water injection well and can effectively supplement stratum energy, improve reservoir permeability and comprehensively improve the water injection development effect of an oil field.

Description

technical field [0001] The invention relates to a composite nano-SiO 2 The pressure-reducing and injection-increasing agent and a preparation method thereof, more specifically, relate to a technical field for enhancing crude oil recovery in the process of oil field water flooding in the petroleum industry. The present invention also relates to the composite nano-SiO 2 The preparation of pressure-reducing injection agent and its technological measures for water injection development. Background technique [0002] In the middle and late stages of oilfield development, the reservoirs are faced with problems such as ultra-low permeability, small pore throat radius, complex pore structure, and severe water sensitivity, resulting in poor water absorption capacity of water injection wells, high injection pressure, and even underflow of water injection wells during water injection production. Injection, stop injection and other phenomena, and the poor compatibility between injecte...

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Problems solved by technology

[0002] In the middle and late stages of oilfield development, the reservoirs are faced with problems such as ultra-low permeability, small pore throat radius, complex pore structure, and severe water sensitivity, resulting in poor water absorption capacity of water injection wells, high injection pressure, and even underflow of water injection wells during water injection production. Phenomena such as injection and stoppage, and the poor compatibility between injected water and formation water will cause scaling, aggravate the corrosion and blockage of the wellbore, and eventually lead to the failure of formation energy to be replenished, and the effect of water injection development will be seriously affected