Self-supporting fracturing fluid system for the stimulation of main fracture segments in unconventional reservoirs

Abstract

The present disclosure discloses a self-supporting fracturing fluid system for the stimulation of the main fracture section of an unconventional reservoir, the self-supporting fracturing fluid system comprising a mutually immiscible self-supporting fracturing fluid in the main fracture section and a channel pressure in the main fracture section A fracturing fluid, the self-supporting fracturing fluid in the main fracture section includes the following components: 10-50 parts of triallyl isocyanurate, 40-90 parts of styrene, and 10-20 parts of diaminodiphenyl sulfone, 10-50 parts of epoxy resin, 1-10 parts of surfactant, and 50-500 parts of solvent; the channel fracturing fluid in the main fracture section is a fracturing fluid containing guar gum. The present disclosure can greatly improve the conductivity of fractures in the main fracture section of volume fracturing, and eliminate the risk of sand plugging.

Description

technical field [0001] The present disclosure belongs to the technical field of oilfield development, and in particular relates to a self-supporting fracturing fluid system used for reconstruction of main fracture sections of unconventional reservoirs. Background technique [0002] The stimulation of oil and gas fields can be achieved by injecting fracturing fluid into the reservoir to re-fracture, that is, using the ground high-pressure pump set, at an injection rate (displacement) much higher than the absorption capacity of the formation, a liquid with a certain viscosity (displacement) is squeezed into the reservoir. fracturing fluid) to gradually increase the pressure in the wellbore. When the pressure increases above the fracture pressure of the reservoir, one or more major fractures will form in the reservoir. The formation of the main fracture is the main high-speed channel for oil and gas seepage in the reservoir. Therefore, improving the conductivity of the main fr...

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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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