Physical model combination method and experimental device for displacement of carbonate fracture-cave reservoirs

Abstract

The invention discloses a carbonatite fracture-cave type reservoir displacement physical model combination method and an experiment device. 15 kinds of typical fracture-cave structures are extracted; 14 fracture-cave combination modularized units are finally obtained; and 25 kinds of fracture-cave combination modes are summarized by analyzing different main control factors and combining the practical fracture-cave units. A fracture-cave type reservoir displacement experiment physical model system combination module experiment device for performing the experiment on the carbonatite fracture-cave type reservoir displacement physical model combination method comprises a raw material storage system, a fracture-cave combination device, a pressure supply device, a power supply, a metering system, a data processing system and relevant accessories such as a pipeline and a valve. A serious of novel fracture-cave combination modes for the experiment are provided; devices required by the experiment method are subjected to integral experiment device and technical flow process design; and a whole set of fracture-cave type reservoir displacement experiment physical model system combination module experiment device is finally formed.

Description

Technical field [0001] The invention relates to the technical field of fracture-vuggy oil reservoir development, in particular to a combination method and experimental device of a carbonate rock fracture-vuggy oil reservoir displacement physical model. Background technique [0002] Among carbonate oil reservoirs, about 20% are fracture-cavity reservoirs. Unlike clastic reservoirs, the fluid flow of fracture-cavity reservoirs in the reservoir does not satisfy Darcy's law of percolation, resulting in The development methods of conventional reservoirs cannot effectively guide the development of fracture-cavity reservoirs. Displacement experiment is an important type of experiment in fractured-vuggy reservoirs, which mainly include water flooding, nitrogen flooding, CO 2 The experimental devices mainly include cores, plexiglass and digital cores. Among them, due to the poor representativeness of fractured-cavity reservoirs, the plexiglass devices are currently the main types of displ...

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Problems solved by technology

[0004] The above three methods mainly have the following problems: (1) Simplify caves of different shapes and types into regular spheres or circles, resulting in the incomplete evaluation of residual oil in fractures and caves in the later stage; (2) two-dimensional or three-dimensional The fracture-cavity model of the block cannot study the flow law of the fracture-cavity, and it is difficult to finely evaluate the displacement law of the cave. At the same time, the model cannot be changed after the processing is completed, and the adjustment of the later development policy cannot be evaluated by experiments; (3) Injection-production The location is single, and the actual production site shows that production wells vary greatly in matrix, fractures, and caves. The existing models are seriously insufficient in studying the injection-production location and the injection-production relationship. They are often only connected to one location and can only represent One type of address state, the connection method is incomplete; (4) the fault is an important means of connection, which is not involved in the existing model; (5) the model cannot be reused, and the research cannot be carried out for karst cave units with different geological backgrounds

[0005] At present, the contents consulted from the public literature basically have the above-mentioned problems. For example, the "Fracture-cave Carbonate Huff and Puff Physical Simulation Experimental Device" with the application number of 201510518273. It is impossible to judge which type it belongs to and which experiments can be completed from the figure; the application number is 201310665277.1 "Full 3D Simulation and Visual Displacement Simulation Experiment System of Fracture-cavity Reservoir", which uses a single block of karst cave or The fracture model cannot achieve multiple experimental effects; the application number is 201510712835.4 "Physical Model of Fractured-Cavity Carbonate Reservoir, Displacement Simulation Experimental Device and System", which sets a variety of caves and fractures in the same device , the structure is complex, and can only satisfy the experimental effect of this one

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