Experimental device for physical simulation of fracture-cavity carbonate rock huff and puff

Abstract

The present invention is a fracture-cavity carbonate rock huff and puff physical simulation experiment device, wherein the core huff and puff device includes at least two model units, and the at least two model units are coaxially stacked together in the order from bottom to top; One of the model units is sealed and placed on a circular stainless steel bottom plate, and the top of the uppermost model unit is sealed and covered with a circular stainless steel top plate; the circular stainless steel bottom plate and the circular stainless steel top plate are evenly distributed through the circumference A plurality of connecting bolts are fixedly connected; each model unit includes a cylindrical core, a stainless steel ring is bonded in the circumferential direction of the core, and a plurality of characterization karst caves simulating actual karst caves and a plurality of simulating actual karst caves are arranged in the core. The characterization cracks of the cracks, and the characterization cavities are connected by the characterization cracks. The invention can truly reflect the geological characteristics of the fracture-cavity carbonate reservoir, and obtain the objective law of the huff and puff process under real formation conditions.

Description

technical field [0001] The invention relates to an experimental device for simulating oil reservoirs, in particular to a physical simulation experimental device for fracture-cavity carbonate rock huff and puff. Background technique [0002] The Ordovician reservoir in Tahe Oilfield is a typical fractured-vuggy carbonate reservoir, which is significantly different from the general porous sandstone reservoir and fractured-porous sandstone reservoir. It has high temperature, high pressure, fracture-vuggy structure and The connection relationship is complex and so on. At present, fractured-cavity carbonate reservoirs mainly rely on natural bottom water for energy exploitation in the early stage. As the exploitation process progresses, some wells suffer from insufficient energy supply, premature water breakthrough of oil wells, low reserves production capacity, and overall recovery of the reservoir. issues such as low rates. Gas injection huff and puff has incomparable advantag...

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Problems solved by technology

The complexity of the fracture-cavity combination relationship and flow law also brings great difficulties to indoor physical simulation. The large-scale pressure-resistant physical model and simulation experiment method that truly simulates the on-site fracture-cavity connection relationship are one of the technical difficulties.

[0003] The current 3D physical simulation device for fracture-cavity carbonate reservoirs cannot withstand high pressure. In laboratory experiments, the simple oil-water-gas flow process is mainly simulated under normal pressure, which cannot truly reflect the formation pressure, let alone Simulation of indoor huff and puff process under formation pressure

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