Nanometer fluid for compact oil reservoir imbibition oil discharging and preparation method thereof

Abstract

The invention relates to nanometer fluid for compact oil reservoir imbibition oil discharging and a preparation method thereof. The nanometer fluid for compact oil reservoir imbibition oil discharging is prepared from the following ingredients through being metered by using the total weight as 100: 0.1 to 1 percent of hydrophobic nanometer silicon dioxide, 0.01 to 1 percent of surfactants, 0.1 to 1 percent of auxiliary dispersants and the balance water. The preparation method and the process are simple; the large-scale use in the oil field can be realized; after the injection into the stratum, the nanometer fluid for compact oil reservoir imbibition oil discharging generates a wedge-shaped thin film in a contact region of rock and oil; by using the structure, the forward thrust can be generated; the auxiliary effects of capillary pressure reduction, wettability reversal, phase seepage change hysteresis effect and the like generated by the system are combined; the oil can be peeled away from the rock surface; the goal of improving the yield is achieved.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemicals, and relates to a nanofluid for imbibition and oil discharge in tight oil reservoirs and a preparation method thereof. Background technique [0002] With the continuous development of the petroleum industry and the deepening of exploitation, the proportion of tight oil reservoirs has gradually increased, even accounting for 50% of the total petroleum resources. With the increasing difficulty of oil and gas field exploitation, the development of tight oil reservoirs will become the focus of my country's petroleum industry. Therefore, how to effectively improve the oil recovery of tight oil reservoirs has become an urgent problem to be solved. [0003] At present, water injection development and hydraulic fracturing are the main development methods of tight oil reservoirs. Because there is a layer of hydration film on the rock surface of tight oil reservoirs, which increases the water flo...

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Problems solved by technology

[0003] At present, water injection development and hydraulic fracturing are the main development methods of tight oil reservoirs. Because there is a layer of hydration film on the rock surface of tight oil reservoirs, which increases the water flow resistance and water injection pressure, water injection is difficult and cannot achieve good development results; Fracturing requires formation reconstruction to form industrial production capacity, which will cause great damage to the formation, and for tight oil reservoirs, the decrease in production pressure difference will also increase the damage of water lock, which is even more detrimental to the development of the reservoir. to develop

Since tight oil mostly occurs in nano-scale pores or micro-fractures, and the reservoir pore connectivity is poor, which is not conducive to fluid flow, general chemical flooding cannot achieve good development results, so how to develop a tight oil recovery Efficient chemical flooding agents become a current problem

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