Self-supporting fracturing fluid system for modifying main fracture section of unconventional reservoir

Abstract

The invention discloses a self-supporting fracturing fluid system for modifying a main fracture section of an unconventional reservoir. The self-supporting fracturing fluid system comprises main fracture section self-supporting fracturing fluid and main fracture section channel fracturing fluid which are immiscible, the main fracture section self-supporting fracturing fluid is prepared from the following components of, in parts by weight, 10-50 parts of triallyl isocyanurate, 40-90 parts of styrene, 10-20 parts of diaminodiphenyl sulfone, 10-50 parts of epoxy resin, 1-10 parts of surfactant and 50-500 parts of solvent, and the main fracture section channel fracturing fluid is fracturing fluid containing guanidine gum. According to the self-supporting fracturing fluid system, the flow conductivity of fractures of the main fracture section of volume fracturing can be greatly improved, and the sand blockage risk is completely eradicated.

Description

technical field [0001] The disclosure belongs to the technical field of oilfield development, and in particular relates to a self-supporting fracturing fluid system used for the reconstruction of the main fracture section of an unconventional reservoir. Background technique [0002] The production increase of oil and gas fields can be achieved by injecting fracturing fluid into the reservoir to recreate fractures, that is, using the ground high-pressure pump set to squeeze liquid with a certain viscosity ( fracturing fluid) to gradually increase the pressure in the wellbore. When the pressure increases above the fracture pressure of the reservoir, one or more main fractures will form in the reservoir. The formation of main fractures provides the main high-speed channel for oil and gas seepage in the reservoir. Therefore, increasing the conductivity of the main fractures can reduce the seepage resistance when oil and gas flow to the near-wellbore zone, increase the total pro...

AI Technical Summary

Problems solved by technology

[0007] (2) The damage of fracturing fluid

For high-temperature deep wells, in order to cope with the impact of high temperature on the viscosity of fracturing fluid, the concentration of agents will be further increased, and the damage caused will be further increased

[0009] (3) Potential risk of sand plugging

[0010] Sand plugging in the wellbore is one of the most serious accidents during fracturing construction. Sand plugging will disrupt the normal construction process, damage formation seepage, seriously waste fracturing materials, and lead to failure

Due to the design requirements of high conductivity fractures in the main fracture section, the risk of sand addition is significantly increased

[0011] (4) Adding solid proppant will significantly accelerate the damage of construction equipment

[0012] Injecting solid proppant with large liquid volume, large displacement and high pump pressure for a long time has obvious erosion effect on wellbore and production and operation pipelines, leading to early damage of equipment and possible construction accidents, which not only increases operating costs, but also reduces Improve construction efficiency and increase construction risk

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