Huff-puff physical simulation experiment device for fracture-cavern type carbonate rock

Abstract

The invention discloses a huff-puff physical simulation experiment device for fracture-cavern type carbonate rock. A rock core huffing and puffing device of the device comprises at least two model units which are coaxially and sequentially stacked together from bottom to top; the lowermost model unit is placed on a circular stainless steel bottom plate in a sealed mode, and the top of the uppermost model unit is covered with a circular stainless steel top plate in a sealed mode; the circular stainless steel bottom plate is fixedly connected with the circular stainless steel top plate through multiple connecting bolts which are evenly and circumferentially distributed. Each model unit comprises a cylindrical rock core, a stainless steel ring is bonded on the rock core in the circumferential direction, multiple carved karst caves simulating actual karst caves and multiple carved cracks simulating actual cracks are formed in the rock core, and the carved karst caves are connected with one another through the carved cracks. According to the huff-puff physical simulation experiment device for the fracture-cavern type carbonate rock, the geologic characteristics of a fracture-cavern type carbonate rock reservoir can be really reflected, and the objective laws on the real stratum conditions can be obtained.

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...

AI Technical Summary

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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