A kind of phase change material liquid and the solid phase proppant formed by it

Abstract

The invention provides a phase change material liquid and a solid phase proppant formed therefrom. Wherein, in terms of mass percentage, the components for preparing the phase change material liquid include: supramolecular construction unit 10-60wt%, supramolecular functional unit 20-50wt%, dispersant 0.1-2wt%, inorganic structuring agent 0.1-1wt% %, initiator 0.1‑1wt%, and the rest are solvents; supramolecular building blocks include melamines and / or triazines; supramolecular functional units include dicyclopentadiene resins; dispersants include hydroxylated polysaccharides and surfactants. After the phase-change material liquid enters the reservoir, under the action of supramolecular chemistry and physics, it can form a solid-phase material to support fractures. Because there is no solid phase injection, it can effectively reduce the friction of the pipe string, reduce the requirements for construction equipment, surface pipelines, wellheads and construction pipe strings, effectively reduce construction costs, and reduce construction risks and safety hazards.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir development, and in particular relates to a phase change material liquid and a solid phase proppant formed therefrom. Background technique [0002] Hydraulic fracturing technology has been widely used in the development of oil and gas fields as the main measure for oil and gas well stimulation and water well injection, and has made important contributions to the stable production and injection of oil and gas fields. Hydraulic fracturing is to pump high-viscosity pre-fluid into the target reservoir to form and extend fractures at high pressure, and then pump sand-carrying fluid mixed with proppant. The sand-carrying fluid can continue to extend the fracture and carry proppant deep into the fracture. For fractures, it is best to degrade the fracturing fluid into a low-viscosity fluid and flow back to the bottom of the well, leaving a high-conductivity flow channel formed by the proppant suppor...

AI Technical Summary

Problems solved by technology

In 2010, Schlumberger proposed that the fracture conductivity of HIWAY high-speed channel flow is not affected by the permeability of proppant. Compared with conventional fracturing technology, this technology also needs to inject solid phase proppant into the formation, and the process implementation is complicated

Although this process solves some major problems in the injection of solid phase proppant in conventional hydraulic fracturing, it also has some defects: on the one hand, the toughness of the solid phase proppant (solid phase particles) obtained by phase transformation is insufficient, and it is easy to occur Broken, blocking the gaps between solid phase particles, affecting the conductivity of propped fractures

On the other hand, the reaction speed of phase change material liquid forming into solid phase proppant is slow, which requires a long construction operation time, and during this period, once the phase change material has not phase change before the fracture is closed, it has a certain pressure. capacity of the proppant, the phase change fracturing process will fail

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