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

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...

AI Technical Summary

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-assembled monolayer comprising an alkyl triethylene oxide formed by a vaporization process or a solution process Chlorosilane layer, such as octadecyltrichlorosilane layer or perfluorodecyltrichlorosilane layer, but the main purpose of the above-mentioned invention to prepare the hydrophobic mask is to prolong the service life of the substrate; adopt vaporization process or solution process (sacrificial Layer etching, surface oxidation, self-assembled monolayer formation, cleaning and drying) molding, complex process, high cost, not suitable for oil and gas field sand control and proppant technology for fracturing; and the prepared hydrophobic mask can change the surface of quartz sand Wettability, improvement of surface stability, acid corrosion resistance, water corrosion resistance, and improvement of quartz sand strength and flow conductivity cannot meet the requirements of sand control and fracturing for proppant

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