Experimental device and experimental method for measuring isotropic and reverse imbibed recovery

Abstract

The invention discloses an experimental device and experimental method for measuring the produced quantity of same-direction infiltration and reverse-direction infiltration. The device consists of a to-be-tested core 1, a holder 2, a liquid storage container 3, a piston 4, an incubator 5, a liquid storage tank 6, a motor 7, a self-priming pump 8, a beaker 11, a computer 12, a confining pressure pump 13 and a pressure meter 14, wherein the to-be-tested core 1 is installed in the holder 2; the left end of the holder 2 is connected with the liquid storage container 3, and the right end of the holder 2 is connected with the piston 4; the liquid storage container 3 is internally provided with a spiral blade 32, the upper end of the liquid storage container 3 is connected with the liquid storagetank 6, and the lower end of the liquid storage container 3 is connected with the beaker 11; the liquid storage container 3 is also connected with the motor 7 and the self-priming pump 8; a liquid outlet pipe of the self-priming pump 8 extends into a measuring cylinder 9 on an electronic balance 10; a liquid outlet pipe at the lower end of the holder 2 extends into a measuring cylinder 18 on an electronic balance 19; and the electronic balance is connected with the computer. The device can quantitatively measure the produced quantity of the same-direction infiltration and reverse-direction infiltration under high temperature and high pressure conditions, and provide technical support and theoretical basis for studying the dynamic state of infiltration and displacement of reservoir oil inreal formation conditions.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to an experimental device and an experimental method for measuring the production volume of co-imbibition and reverse imbibition. Background technique [0002] At present, the development of conventional oil and gas resources has entered the middle and later stages. In order to meet the needs of oil and gas resources, large-scale development of unconventional oil and gas resources is urgently needed. The amount of unconventional oil and gas resources is huge. properties, conventional mining methods are no longer applicable to the development of unconventional reservoirs. Although the pore throats of unconventional reservoirs are small, the phenomenon of capillary force is very obvious. In recent years, the method of using capillary force as the driving force to make the fluid in the fracture enter the rock matrix, thereby displacing the oil and gas in the rock pores has ...

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Problems solved by technology

This measurement method is not accurate, because the water phase enters the core matrix, and part of the oil phase will seep out from the core parts that have not touched the water body. It will imbibe from the core part in contact with the water body, and this part of the oil phase is the oil phase produced by reverse imbibition, so this measurement method is not strict, and it does not strictly distinguish between co-imbibition and reverse imbibition. production volume

For the reverse imbibition test, most of the experimental designs use sealing materials to seal the end face of the core, and only one end face of the core is opened to contact the imbibition solution. The recovery measured in this way is the reverse imbibition amount (Lyu C. Experimental study of boundary condition effects on spontaneous imbibition in tight sandstones[J]. Fuel 235(2019):374-383), but this method can only measure the imbibition recovery under normal temperature and pressure, and the actual Reservoir Formation High Temperature and High Pressure Conditions

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