Full-suspension fracturing fluid and its fracturing construction method
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A construction method and full suspension technology, which are applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of inability to achieve full suspension of proppant, inability to achieve self-heavy weight, and reduce the amount of fluid entering the well, etc. Achieve the effect of reducing the injection pressure of the construction pump, reducing the construction risk, and reducing the amount of fluid entering the well
Active Publication Date: 2015-12-09
BC P INC CHINA NAT PETROLEUM CORP +1
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[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
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[0029] As a preferred embodiment of the present invention, the full-suspension fracturing fluid comprises the following components by weight:
[0031] Clear water or weighted brine or acid solution: 100 parts;
[0032] In terms of mass percentage, the full-suspension fracturing fluid thickener is composed of 35% dimethyl dihexadecyl-octadecyl ammonium chloride or its derivatives, 15% polycondensed phosphates, 10% shielding reducer Fluid loss agent and 40% H 2 A mixture of O.
[0033] The condensed phosphates mentioned above are the general term for polyorthophosphates and polymetaphosphates, which are generally easy to hydrolyze and can be used as detergents, water softeners, ion exchangers, etc. Examples include sodium tripolyphosphate and sodium hexametaphosphate.
Embodiment 2
[0035] As another preferred embodiment of the fracturing fluid, the full-suspension fracturing fluid comprises the following components by weight:
[0037] Clear water or aggravated salt water or acid solution: 100 parts;
[0038] In terms of mass percentage, the full-suspension fracturing fluid thickener is composed of 55% dimethyl dihexadecyl-octadecyl ammonium chloride or its derivatives, 5% polycondensed phosphate, 10% shielding reducer Fluid loss agent and 30% H 2 A mixture of O.
Embodiment 3
[0040] As the best implementation mode of this fracturing fluid, the total suspension fracturing fluid thickener is 13 parts, and the clear water, aggravated brine or acid solution is 100 parts. All the other are the same as embodiment 1 or embodiment 2.
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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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