Physical evaluation equipment and evaluation method of oxygen assisted microbial oil displacement

Abstract

The invention relates to physical evaluation equipment of oxygen assisted microbial oil displacement. The physical evaluation equipment comprises a gas liquid mixing device, a solution gas injecting device and a multifunctional displacement metering device. The gas liquid mixing device comprises a first plunger pump, an intermediate container with scales, a gas liquid mixing container, a gas injecting pump, a storage, and a second plunger pump. The solution gas injecting device comprises an intermediate container, a third plunger pump, a sixth conduit and a seventy conduit. The multifunctionaldisplacement metering device comprises a rock core clamp, a differential pressure measuring device, a multifunctional meter, a measuring cup, an eighth conduit and a ninth conduit. According to the physical evaluation method of oxygen assisted microbial oil displacement, testing is conducted by adopting the physical evaluation equipment of oxygen assisted microbial oil displacement. The utilization of dissolved oxygen in water by microorganisms in the process of microbial oil displacement can be reasonably simulated, the whole process of microbial oil displacement can be completely simulated,and the volume of fluid in each phase after displacement can be accurately measured.

Description

technical field [0001] The invention relates to the technical field of microbial oil flooding core displacement, in particular to an oxygen-assisted microbial oil flooding physical evaluation equipment and evaluation method. Background technique [0002] For microbial flooding, the continuous supply of oxygen is an important condition to ensure the microbial metabolism of the reservoir to generate biosurfactants, which is one of the main mechanisms for microbial flooding to enhance oil recovery. At present, in the field implementation of microbial oil flooding, the method of injecting air into the reservoir is mainly used to provide oxygen to microorganisms, and microorganisms mainly use oxygen in water for metabolic activities, so dissolved oxygen in water is an important prerequisite for microbial metabolism to produce biosurfactants . At present, the laboratory simulation of air-assisted microbial flooding experiments mostly adopts the method of directly injecting air in...

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Problems solved by technology

At present, the laboratory simulation of air-assisted microbial flooding experiments mostly adopts the method of directly injecting air into the core to simulate the process of air-assisted microbial flooding; in the process of air-assisted microbial flooding, except for the gas dissolved in water, most of the gases in the air cannot Dissolved in water, this part of the gas will directly displace the crude oil in the porous medium of the core, but limited by the size of the core, the recovered crude oil is seriously affected by the air flooding mechanism, and the amount of crude oil driven by microbial flooding using dissolved oxygen in water The relative reduction cannot fully simulate the effect of oxygen-assisted microbial flooding, which affects the reliability and accuracy of the experimental results; in addition, the conventional measurement methods mostly use open measuring cylinders for direct measurement, which cannot collect and measure the gas, resulting in experimental errors

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