Thin interbed carbonate rock bottom water reservoir CO2 huff and puff experimental test method

Abstract

The invention relates to a thin interbed carbonate rock bottom water reservoir CO2 huff and puff experimental test method. The thin interbed carbonate rock bottom water reservoir CO2 huff and puff experimental test method comprises the following steps of 1 manufacturing thin interbed carbonate rock five-point well network flat plate models, 2 preparing a crude oil sample, a formation water sample and injected gas, 3 arranging five layers of five-point well network flat plate models different in penetration rate into a multi-layer flat plate model core holding unit specially made for the models in certain sequence from top to bottom at lithologic intervals, 4 starting a confining pressure pump, 5 starting a constant-temperature box, 6 conducting formation original state recovery on the multiple layers of flat plate models, 7 starting a return pressure pump and setting the pressure of the return pressure pump according to extraction pressure set through an experiment, 8 beginning to perform a water-oil displacement experiment, 9 injecting CO2 and then performing well soaking and 10 performing depressurizing production and subsequent water flooding after well soaking and calculating development indexes. Tools and means are provided for evaluation on thin interbed carbonate rock bottom water reservoir CO2 huff and puff water control and oil increase effects. The thin interbed carbonate rock bottom water reservoir CO2 huff and puff experimental test method is reliable in principle and simple in operation.

Description

technical field [0001] The invention relates to a thin interbedded carbonate rock bottom water reservoir CO 2 Huff and puff experimental test methods, especially an indoor high-temperature, high-pressure, different lithology, and different physical properties flat-plate model vertical well water control and oil-increasing experimental research, belong to the field of oil and gas exploration and development. Background technique [0002] CO 2 The experimental test method research of huff-puff control water flooding is to guide abnormal water-flooded wells in bottom water reservoirs or water-flooding reservoirs (abnormal water-flooded wells refer to production degree lower than 80% of the calibrated water flooding efficiency, while water cut and production It is an important laboratory experimental study on the effect of reducing water cut and increasing oil recovery, thereby improving oil recovery. The currently known experimental testing methods mainly include: small core ...

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Problems solved by technology

Thin interbedded carbonate reservoirs developed with bottom water or water injection have the following problems in the process of water injection development: serious vertical heterogeneity, uneven production of oil layers, and enrichment of remaining oil between wells; Different, poor physical properties, the injected water rushes along the large pores, and it is difficult to tap the potential

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