Experimental detecting system and detecting method for distribution of remaining oil in fracture-cavity reservoir bed

Abstract

The invention relates to an experimental detecting system and method for distribution of remaining oil in a fracture-cavity reservoir bed. The experimental detecting system comprises a constant-flux pump, a container containing formation water, a container containing compounded crude oil, a container containing a contrast agent, a four-way valve, a fracture-cavity reservoir bed flat model, a core holder, an X-ray tomoscan system and a data processing and imaging system, wherein the container containing formation water, the container containing the compounded crude oil and the container containing the contrast agent are connected with the three inlets of the four-way valve through a first pipeline, a second pipeline and a third pipeline respectively; the outlet of the four-way valve is connected with the injection opening of the core holder through a pumping pipeline; the output opening of the core holder is used for outputting a liquid; the liquid output from the output opening of the core holder is collected in a measuring cylinder. According to the experimental detecting system and method, the oil-water displacement process under a formation condition is simulated actually, and the percolation mechanism and the remaining oil distribution rule are similar to practical water injection in a mine, so that the detection conclusion has a guiding significance in mine application, and the problem that the water injection and oil displacement process cannot be visual is solved.

Description

technical field [0001] The invention belongs to the field of physical experiment equipment for oil and gas exploitation, and in particular relates to an experimental detection system and method for remaining oil distribution in fracture-cavity reservoirs. Background technique [0002] With the rapid development of the petroleum industry, the field of petroleum and natural gas exploration has been continuously expanded, and a large number of carbonate rock reservoirs have been discovered. According to statistics, more than 50% of the world's oil and gas reservoirs are carbonate reservoirs. The storage spaces of fractured-vuggy carbonate reservoirs are mainly pores, dissolved pores and even dissolved caves. Compared with conventional sandstone reservoirs with only one micron-sized intergranular or intragranular pores or micro-fractures, fracture-cavity reservoirs are oil-bearing reservoirs with various pore types and large pore scales (millimeter to centimeter). gas porous m...

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Problems solved by technology

However, the current experimental system mostly calculates the oil displacement efficiency by measuring the oil production at the outlet, or relies on the electrodes arranged on the model to measure the change of resistivity, and the change of oil saturation in the indirect reaction model is very important for researchers. The displacement process cannot be visualized, and the occurrence status and controlling factors of remaining oil in pores and dissolved pores cannot be quantitatively evaluated after water flooding. Applications in the Study of Enrichment Patterns

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