Modified nano silicon dioxide fluid, preparation method and application thereof, slickwater fracturing fluid and application thereof

A nano-silica, silicon dioxide technology, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., can solve the problem of low recovery rate of dialysis, and achieve the effect of excellent dispersion stability

Pending Publication Date: 2022-07-29
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

However, the existing slick water fracturing fluid is mainly composed of polymer drag reducers and a small amount of drainage aids and anti-swelling agents, and there is still the problem of low dialysis recovery

Method used

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  • Modified nano silicon dioxide fluid, preparation method and application thereof, slickwater fracturing fluid and application thereof
  • Modified nano silicon dioxide fluid, preparation method and application thereof, slickwater fracturing fluid and application thereof
  • Modified nano silicon dioxide fluid, preparation method and application thereof, slickwater fracturing fluid and application thereof

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preparation example Construction

[0038] The present invention also provides a method for preparing the modified nano-silica fluid according to the above scheme, which includes the following steps: mixing and modifying the hydrophilic nano-silica sol, a modifier, a low-temperature stabilizer and water to obtain the modified nano-silica sol. Sexual nano silica fluid;

[0039] The temperature of the modification is 70-90°C.

[0040] In the present invention, the mixing of the hydrophilic nano-silica sol, the modifier, the low-temperature stabilizer and the water preferably includes: heating the water to the modified temperature, adding the low-temperature stabilizer to the water during the heating, and then adding the low-temperature stabilizer to the water. The hydrophilic nano-silica sol is added to the obtained first mixed solution, and then a modifier is added to the obtained second mixed solution.

[0041]In the present invention, the mixing is preferably carried out under stirring conditions. The present...

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Abstract

The invention provides a modified nano silicon dioxide fluid, a preparation method and application thereof, a slick water fracturing fluid and application thereof, and belongs to the technical field of shale oil development. The modified nano silicon dioxide fluid can enhance the interaction between the modified nano silicon dioxide and the slickwater fracturing fluid through electrostatic interaction and the like, so that the oil-water interfacial tension is effectively reduced, and the wettability is changed. The slick water fracturing fluid prepared from the modified nano silicon dioxide fluid can form a wedge-shaped structure in an oil-water-rock three-phase contact area, and crude oil is stripped from the rock surface by the generated structure separation pressure, so that the imbibition recovery rate is increased. The result of the embodiment shows that the imbibition recovery rate of the modified nano silicon dioxide fluid is up to 12% at most, the interfacial tension is reduced to 0.11 mN/m, the wetting transition is up to 158 degrees at most, and the wetting transition is up to 151 degrees in an 8-hour oil drop stripping experiment.

Description

technical field [0001] The invention belongs to the technical field of shale oil development, and in particular relates to a modified nano-silica fluid, a preparation method and application thereof, a slick water fracturing fluid and its application. Background technique [0002] Shale oil has become a hot spot in the exploration and development of unconventional oil and gas resources in the world, affecting the strategic layout of energy in various countries. In the development process of shale oil, imbibition replacement technology has become an important research direction to improve single well production and prolong production validity period. The driving of the well inlet fluid can spontaneously imbibe into the fine pores of the matrix rock, and through oil-water replacement, the crude oil is gradually collected into the large pores, thereby realizing the purpose of supplementing the formation energy and improving the final recovery rate. [0003] Slippery hydraulic f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/66C09K8/68C09K8/84C09K8/88E21B43/26
CPCC09K8/665C09K8/68C09K8/845C09K8/88E21B43/26C09K2208/10
Inventor 张甜甜李治平高明伟杨婕邹家乐
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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