OTS self-assembling water inhibition quartz sand as well as preparation method and application thereof

A technology of quartz sand and self-assembly, which is applied in the field of proppant for sand control and fracturing in oil and gas fields. The effect of good oil performance, low cost and simple operation

Inactive Publication Date: 2015-03-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method is complicated and the cost of raw materials is high, so it is not suitable for large-displacement construction and application in oil fields
Chinese patent document CN103848957A adopts epoxy resin, fluorine-containing compound, and coupling agent to prepare hydrophobic type proppant. This method uses many types of hydrophobic substances and additives, which increases the preparation cost and is not conducive to environmental protection.
[0006] Although in the field of electronic semiconductor manufacturing, it involves adding hydrophobic and chemically inert self-assembled monolayers on quartz substrates, Chinese patent document CN101266403A (application number 200710143734.5) discloses a mask for a hydrophobic surface, which includes: A substrate; a plurality of patterns formed on the substrate; and a self-assembled monolayer formed on the substrate not covering the patterns, the self-assemb

Method used

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  • OTS self-assembling water inhibition quartz sand as well as preparation method and application thereof
  • OTS self-assembling water inhibition quartz sand as well as preparation method and application thereof
  • OTS self-assembling water inhibition quartz sand as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation method of OTS self-assembled water-suppressing quartz sand, the steps are as follows:

[0046] (1) Measure 100mL of toluene, add it to a beaker, then add 0.233g of octadecyltrichlorosilane (OTS) and stir until uniform to obtain a reaction in which the concentration of octadecyltrichlorosilane (OTS) is 6mmol / L liquid;

[0047] (2) Take 300g of quartz sand, wash it with distilled water for 2 times, dry it, soak it in chromic acid lotion with a concentration of 12wt% for 0.5h, wash it with distilled water for 2 times, and dry it to obtain the treated quartz sand;

[0048] (3) Place the treated quartz sand obtained in step (2) in the reaction solution obtained in step (1), soak and react for 0.5h, filter, take the precipitate, and then use toluene, acetone, absolute ethanol Rinse with distilled water respectively, and place in the air for 48 hours to dry to obtain OTS self-assembled water-suppressing quartz sand.

Embodiment 2

[0050] A preparation method of OTS self-assembled water-suppressing quartz sand, the steps are as follows:

[0051] (1) Measure 100mL of toluene, add it to a beaker, then add 0.233g of octadecyltrichlorosilane (OTS) and stir until uniform to obtain a reaction in which the concentration of octadecyltrichlorosilane (OTS) is 6mmol / L liquid;

[0052] (2) Take 300g of quartz sand, wash it with distilled water for 2 times, dry it, soak it in chromic acid lotion with a concentration of 12wt% for 0.5h, wash it with distilled water for 2 times, and dry it to obtain the treated quartz sand;

[0053] (3) Place the processed quartz sand obtained in step (2) in the reaction solution obtained in step (1), soak and react for 1 hour, filter to get the precipitate, and then use toluene, acetone, absolute ethanol and Rinse them with distilled water, and place them in the air for 60 hours to dry to obtain OTS self-assembled water-suppressing quartz sand.

Embodiment 3

[0055] A preparation method of OTS self-assembled water-suppressing quartz sand, the steps are as follows:

[0056] (1) Measure 100mL of toluene, add it to a beaker, then add 0.233g of octadecyltrichlorosilane (OTS) and stir until uniform to obtain a reaction in which the concentration of octadecyltrichlorosilane (OTS) is 6mmol / L liquid;

[0057] (2) Take 300g of quartz sand, wash it with distilled water for 2 times, dry it, soak it in chromic acid lotion with a concentration of 12wt% for 0.5h, wash it with distilled water for 2 times, and dry it to obtain the treated quartz sand;

[0058] (3) Place the treated quartz sand obtained in step (2) in the reaction solution obtained in step (1), soak and react for 1.5 hours, filter to get the precipitate, and then use toluene, acetone, absolute ethanol Rinse with distilled water respectively, and place in the air for 72 hours to dry to obtain OTS self-assembled water-suppressing quartz sand.

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Abstract

The invention relates to a preparation method and an application of OTS self-assembling water inhibition quartz sand. The preparation method comprises the following steps: (1) preparing an octadecyltrichlorosilane/methylbenzene liquid from octadecyltrichlorosilane and methylbenzene according to a ratio, thereby obtaining a reaction liquid; (2) performing surface treatment on the washed and dried common quartz sand for fracturing by using a chromic pickling liquid, washing, drying, thereby obtaining the treated quartz sand; and (3) adding the treated quartz sand into the reaction liquid, soaking, reacting, filtering, taking the precipitate, washing, drying, thereby obtaining the OTS self-assembling water inhibition quartz sand. The OTS self-assembling water inhibition quartz sand prepared by the invention is good in water inhibition and oil penetration performance and stable in surface properties and has good acid etching resistance and water erosion resistance. Moreover, compared with the common quartz sand, the OTS self-assembling water inhibition quartz sand disclosed by the invention is high in propping agent strength, low in breakage rate and good in diversion capacity, is suitable for large-scale oilfield application and has significance for improving the oil production rate and reducing the production cost.

Description

technical field [0001] The invention relates to a preparation method and application of OTS self-assembled water-suppressing quartz sand, and belongs to the technical field of proppants for sand control and fracturing in oil and gas fields. Background technique [0002] With the in-depth development of unconsolidated sandstone reservoirs, more and more oilfields have entered the late stage of high water cut and ultra-high water cut development. Fracturing and sand control technology is an important measure for increasing production and injection of such reservoirs. Fractures with high conductivity are not only oil flow channels for increasing production, but also advantageous channels for formation water production, which will inevitably affect the oil recovery rate, especially for edge-bottom water reservoirs. [0003] At present, the proppants used in fracturing and sand control are mainly quartz sand or ceramsite. Changing the surface properties of proppants is an effecti...

Claims

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Application Information

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IPC IPC(8): C04B14/06
Inventor 齐宁刘帅方明君田壮壮汪洋陈振邓爽
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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