Phase-change material liquid and solid-phase propping agent formed by phase-change material liquid

Abstract

The invention provides a phase-change material liquid and a solid-phase propping agent formed by the phase-change material liquid. The phase change material liquid is prepared from the following components in percentage by mass: 10-60 wt% of a super-molecule construction unit, 20-50 wt% of a super-molecule functional unit, 0.1-2 wt% of a dispersing agent, 0.1-1 wt% of an inorganic construction promoting agent, 0.1-1 wt% of an initiator and the balance of a solvent; the super-molecule construction unit comprises a melamine substance and / or a triazine substance; the super-molecule functional unit comprises dicyclopentadiene resin; and the dispersing agent comprises a hydroxyl-containing polysaccharide substance and a surfactant. After entering a reservoir, the phase-change material liquid can form a solid-phase substance to prop cracks under super-molecule chemical and physical action. Due to the injection of the non-solid phase, the string friction can be effectively reduced, and the requirements on construction equipment, ground surface pipelines, wellheads and operating tool strings are reduced. Therefore, the construction cost is effectively reduced, and the construction risk andthe potential safety hazard are reduced.

Description

Technical field [0001] The invention belongs to the technical field of oil reservoir development, and specifically 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 to increase oil and gas well production 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 prefluid into the target reservoir to form fractures and extend them under high pressure, and then pump the sand-carrying liquid mixed with proppant. The sand-carrying liquid can continue to extend the fractures and carry the proppant deeply. For fractures, it’s best to break the fracturing fluid and degrade it into low-viscosity fluids flowing back to the bottom of the well, leaving a flow channel with high conductivity formed by t...

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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