Full-suspension fracturing fluid and its fracturing construction method

Abstract

The invention discloses a full-suspension fracturing fluid. The full-suspension fracturing fluid comprises the following components in parts by weight: 4 to 15 parts of full-suspension fracturing fluid thickener and 100 parts of clean water, weight salted water or acid liquid. The full-suspension fracturing fluid thickener is a compound consisting of the following ingredients by weight percent: 35 to 55 percent of dihexadecyl dimethyl ammonium chloride to dioctadecyl dimethyl ammonium chloride or derivative thereof, 5 to 15 percent of condensed polyphosphate, 5 to 10 percent of shielding filtrate reducer and 20 to 50 percent of H2O. The fracturing fluid has good temperature resistance, good shearing resistance, high viscosity at a storage temperature, good adhesion elasticity, small filtration loss and strong capacity for suspending a supporting agent, can realize the full suspension of the supporting agent and can greatly improve the sand ratio, the construction sand ratio is higher than that of the conventional surface active fracturing fluid, and the sand ratio can reach more than 50 percent; and the full-suspension surface active fracturing fluid with high sand ratio is high in density, the density can reach 1.3 to 2.2g / cm<3>and is equal to a high-density weighted fracturing fluid, the pressure of a hydrostatic column can be remarkably improved, and the pressure of the hydrostatic column is higher than that of the conventional surface active fracturing fluid.

Description

technical field [0001] The invention relates to the technical field of fracturing fluid used in oil exploitation and a fracturing construction method thereof. Background technique [0002] With the advancement of petroleum exploration and development technology, the development of oil and gas resources continues to develop in depth, and more and more deep wells are developed; large-scale stimulation such as horizontal well fracturing and volume fracturing has gradually become the development trend of reservoir stimulation. The prominent contradiction between deep well fracturing and large-scale fracturing is the problem of construction displacement, pump pressure and fracturing fluid friction. How to increase displacement, reduce construction pump pressure and friction, and improve the protection performance of fracturing fluid reservoir Key issues that need to be addressed during liquid development. [0003] The weighted fracturing fluid can effectively increase the densit...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the above-mentioned technical problems in the prior art that the fluid loss is large, the sand ratio is low, the full suspension of the proppant cannot be realized, and the density is low, and the self-weighting cannot be realized, and a full-suspension fracturing fluid is provided. The fracturing fluid has good temperature and shear resistance, high viscosity at reservoir temperature, good viscoelasticity, low fluid loss, strong suspending ability to proppant, and can fully suspend proppant, which can greatly improve Sand ratio, the sand ratio can reach more than 50%, which can effectively reduce the amount of fluid entering the well; the high-sand ratio full-suspension surfactant fracturing fluid has a high density, and the density can reach 1.3-2.2g / cm 3 , which is equivalent to high-density aggravated fracturing fluid, which can significantly increase the hydrostatic column pressure, coupled with the inherent low friction characteristics of the surfactant fracturing fluid system, can significantly reduce the construction pump injection pressure and effectively improve the construction pump injection discharge. quantity