Method for screening imbibition agents of low-permeability reservoir

Abstract

The invention provides a method for screening imbibition agents of low-permeability reservoir. The screening method comprises performing oil-sand imbibition effect testing on to-be screened low-permeability reservoir imbibition agents, so as to obtain first screening samples; performing adhesion-work reduction value testing on the first screening samples, and selecting the first screening samples with the adhesion-work reduction value larger than zero, so as to obtain second screening samples; performing emulsification stability and viscosity testing on the second screening samples, so as to obtain third screening samples; performing seepage-force testing on the third screening samples, and selecting the third screening samples with the seepage-forge value being 2 times or more larger than the seepage force value of simulated water or low-permeability reservoir produced water, so as to obtain an imbibition agent suitable for low-permeability reservoir; and finally finishing screening on the low-permeability reservoir imbibition agent after the imbibition agent is verified to be qualified through a rock core experiment. Through the above provided screening method, the obtained imbibition agent is applicable to common low-permeability reservoir, extra-low permeability reservoir and ultra-low permeability reservoir.

Description

technical field [0001] The invention relates to a screening method for an imbibent suitable for common low-permeability, ultra-low-permeability and ultra-low-permeability reservoirs, and belongs to the technical field of reservoir exploitation. Background technique [0002] The proven reserves of low-permeability oil reservoirs in my country are about more than 5 billion tons, and about 2 billion tons have been developed so far, and there are still 3 billion tons to be developed. More than half of the annual new reserves are low-permeability oil reservoirs. [0003] According to the permeability, low-permeability reservoirs can generally be divided into three categories: ordinary low-permeability reservoirs with a permeability of 10-50mD, ultra-low-permeability reservoirs with a permeability of 1-10mD, and ultra-low-permeability reservoirs with a permeability of 0.1-1.0mD. low permeability reservoirs. [0004] The ultra-low-permeability and ultra-low-permeability reservoirs...

AI Technical Summary

Problems solved by technology

However, the basic research on the application of permeants is still in its infancy, and there is still a lack of evaluation index systems and testing methods for permeants in low-permeability reservoirs, and there is still a lack of systematic methods for permeate screening and comprehensive evaluation.

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