Multi-element association type fracturing fluid thickening agent and preparation method thereof

Abstract

The invention relates to a multi-element association type fracturing fluid thickening agent and a preparation method thereof, and belongs to the technical field of oilfield chemistry and engineering. The method comprises the steps: firstly, preparing a water phase from acrylamide, methacrylic acid, a salt-resistant monomer, a temperature-resistant monomer, a hydrophobic monomer, a cosolvent, an oxidizing initiator and water, and then dividing the water phase into two parts, namely a water phase A and a water phase B, or respectively preparing the water phase A and the water phase B; uniformly mixing an oil solvent and a compound emulsifier, and adding an oil-soluble initiator to obtain an oil phase; and firstly, adding the water phase A into the oil phase to initiate a polymerization reaction, and then adding the water phase B to initiate a polymerization reaction to obtain the multi-element association type fracturing fluid thickening agent. The fracturing fluid thickening agent prepared by the method is a liquid multi-element association type fracturing fluid thickening agent which is good in dissolving property and has salt resistance and shear resistance, can be used for two purposes, and also has effective drag reduction performance besides excellent thickening performance and sand suspending effect.

Description

Technical field [0001] The present invention relates to the field of chemical engineering and technology, particularly to a polyol associative thickener fracturing fluid and its preparation method, particularly to a suitable for unconventional shale gas, dense hydrocarbon production polyol associative thickener fracturing fluid line and preparation method of fracturing. Background technique [0002] Acrylamide copolymer water-soluble polymer is a typical widely used in environmental protection to be reused more and petroleum. Acrylamide copolymer polyol thickening agent used for decades as a fracturing fluid, with the continuous research and innovation, the polymer thickener mature production process, the product performance is also rising, conventional polymer thick agent according to the physical shape into two kinds of powder type and emulsion type. Wherein the powder type thickening agent storage convenient, low production cost, the amount is small, the dominant; thickener di...

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Problems solved by technology

For example, Chinese patent application CN201810542225.8 discloses an inverse microemulsion polymer fracturing system that can be applied online as a thickening agent. It has a drag-reducing effect, but its thickening performance and drag-reducing performance under high salinity conditions need to be further improved; Chinese patent application CN201911025482.5 discloses an emulsion polymer for fracturing and its preparation method. The emulsion polymer for fracturing under application can have both thickening and drag reduction effects, but its shear viscosity in 600mg / L brine (6000 salinity) is only 30~40mPa·s, and the drag reduction rate is only 70~74%, its thickening performance and drag reduction performance under high salinity conditions need to be further improved

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