Preparation process of auto-suspension coating material

Abstract

The invention belongs to the technical field of fluid mineral exploitation of oil, natural gas, shale gas and the like, and particularly discloses a preparation process of an auto-suspension coating material. The preparation process comprises the following steps: (1) heating aggregate to 80-230 DEG C, and stirring and mixing the heated aggregate; (2) reducing the temperature to 75-200 DEG C, adding inner layer resin and a curing agent of the inner layer resin, and carrying out stirring to form an inner coating layer; (3) reducing the temperature to 40-130 DEG C, adding a catalyst, outer layerresin, an amine additive and a curing agent of the outer layer resin, and carrying out stirring to form an outer coating layer; (4) reducing the temperature to 35-90 DEG C, adding a drag reducer and carrying out stirring, wherein the mass of the drag reducer is 0.5-1.5% of that of the aggregate; and (5) reducing the temperature to 30-70 DEG C, taking the mixture out, and controlling the apparent density range of the auto-suspension coating material to be 1.05-2.60g / cm<3>. The auto-suspension coating material prepared by the preparation process has good flow conductivity, good auto-suspension performance and reduced friction resistance.

Description

technical field [0001] The invention belongs to the technical field of fluid mineral exploitation such as oil, natural gas and shale gas, and in particular relates to a preparation process of a self-suspension coating material. Background technique [0002] Hydraulic fracturing technology has been relatively mature at home and abroad. Petroleum fracturing proppant is one of the essential items in the fracturing process. Its performance will directly affect the effect of hydraulic fracturing. The apparent density is the key to evaluate the performance of proppant. One of the important indicators, the lower the apparent density, the lower its relative density relative to the fracturing fluid. When the proppant is mixed with the fracturing carrier fluid, the lower the apparent density, the easier it is to suspend in the fracturing fluid, thereby greatly reducing sedimentation rate. Push the pump farther during the pumping process. The high pumping pressure pumps the fluid int...

AI Technical Summary

Problems solved by technology

This type of product can indeed achieve semi-suspension in water and reduce the settling rate of proppant in water, but because the apparent density must be greatly reduced, its production cost will be greatly increased, and the performance of proppant, such as crushing, acid solubility, and diversion and other performance will be significantly reduced

However, the low production efficiency and high cost of resin pellets also limit its popularization and use.

Moreover, although the above-mentioned proppant can realize self-suspension in water, the frictional resistance of the carrier fluid has been greatly improved, so that a higher pump pressure is required to pump the proppant to the corresponding position during construction, which increases the construction cost.

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