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

An injection enhancer and nanotechnology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of water injection development effect, poor water absorption capacity of water injection wells, and high injection pressure, so as to improve water injection development effect and reduce Oil-water interfacial tension, the effect of inhibiting clay swelling

Inactive Publication Date: 2016-01-20
SOUTHWEST PETROLEUM UNIV
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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 w

Method used

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Embodiment Construction

[0013] The first step of water injection well nano-SiO 2 Pressure-reducing injection agent component weight ratio: 0.18% surfactant sodium fatty alcohol polyoxyethylene ether sulfate, 0.12% sodium dodecylbenzenesulfonate, 0.20% surface modifier Si-69, 0.15% nano-SiO 2 , and the rest is water. The second step nano-SiO 2 Preparation method of depressurizing injection agent: Add appropriate amount of 0.2mol / L tetraethyl orthosilicate and absolute ethanol to the flask, stir continuously at 25°C for 10 minutes, add deionized water and ammonia water prepared in a ratio of 4:1 at one time The mixed solution was heated to 80°C, and the stirring speed was kept at 400rpm for water bath reaction for 8h. After high-speed centrifugation and ultrasonic cleaning, SiO 2 The pellets were washed 3 times with deionized water, dried, ground, and sieved to obtain nano-SiO 2 .

[0014] Then add fatty alcohol polyoxyethylene ether sodium sulfate and sodium dodecylbenzenesulfonate into the ename...

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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...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/52
CPCC09K8/58C09K8/52C09K2208/10
Inventor 陈玉祥王霞侯铎罗太元刘卫东石彦刘建军
Owner SOUTHWEST PETROLEUM UNIV
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