A sand-free fracturing fluid with high conductivity, its preparation method, fracturing technology and application

Abstract

The invention relates to sand-free fracturing fluid with high flow conductivity as well as a preparation method, a fracturing technology and application of the sand-free fracturing fluid. The sand-free fracturing fluid comprises a group-A fracturing fluid containing a curable resin prepolymer and a group-B fracturing fluid containing a curing agent and fibers, wherein the group-A fracturing fluidand the group-B fracturing fluid are used cooperatively. The fracturing fluid prepared by the preparation method disclosed by the invention can enter all levels of fractures to form fiber enhanced porous resin to ensure that a fractured complicated fracture net system is relatively high in flow conductivity and can support the fractures, so that the oil and gas recovery rate is increased. Furthermore, the fracturing technology disclosed by the invention is simple, and the fracturing risk is reduced.

Description

technical field [0001] The invention relates to a sand-free fracturing fluid with high conductivity, a preparation method, a fracturing process and application thereof, and belongs to the technical field of hydraulic fracturing in the process of oil and natural gas exploitation. Background technique [0002] Hydraulic fracturing is an important technical method for oil and gas well stimulation. Whether it is conventional low-permeability or ultra-low-permeability oil and gas reservoirs, or shale and tight sandstone reservoirs in unconventional oil and gas reservoirs, hydraulic fracturing plays a key role in increasing production. , especially unconventional reservoirs, without fracturing technology, it is difficult to extract oil and gas underground. Hydraulic fracturing is the use of high-pressure pumps to pump fracturing fluid into the formation to form one or more fractures with a certain geometric size in the formation. The length of the fractures generally ranges from t...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing technologies all need to add sand, and have high requirements on the viscosity of the fracturing fluid. If the viscosity of the fracturing fluid is too low, it will be difficult to carry the proppant, and the proppant cannot be fully suspended in the fracturing fluid, and the cost of fracturing is high. And it is difficult to penetrate deep into the cracks and pores

In traditional fracturing techniques, a large amount of proppant is required, which increases the difficulty of fracturing construction; high-concentration proppant is prone to sand plugging, which can easily lead to fracturing failure; and the use of proppant and high-performance fracturing fluid, Significantly increased the fracturing cost; after the fracturing operation is completed, the fracturing fluid needs to be broken and flowed back to the ground. If the flowback is not complete, the fracturing fluid will cause damage to the reservoir, reduce the permeability of the formation, and cause fracturing Unsatisfactory effect

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