Method for evaluating adaptability of gel microsphere profile control agent to oil reservoir

Abstract

The invention provides a method for evaluating adaptability of a gel microsphere profile control agent to an oil reservoir. The method comprises the following steps: preparing a plurality of cement artificial rock cores; carrying out displacement on each cement artificial rock core by using an aqueous stratum solution and a to-be-measured gel microsphere profile control agent with a known concentration, calculating residual resistance factors and determining minimum expected applicable permeability and maximum expected applicable permeability according to the residual resistance factors; respectively determining minimum applicable permeability and maximum applicable permeability according to the minimum expected applicable permeability and maximum expected applicable permeability; and determining a range with the minimum applicable permeability and maximum applicable permeability as end points as the range of permeability of an oil reservoir stratum, wherein the to-be-measured gel microsphere profile control agent with the known concentration is applicable in the range. The range can be provided by a manufacturer to a user as an applicable standard of the gel microsphere profile control agent, which facilitates selection of an appropriate concentration of the gel microsphere profile control agent by a profile control water plugging worker.

Description

technical field [0001] The invention relates to the technical field of oil drilling, in particular to a method for evaluating the reservoir adaptability of a gel microsphere profile control agent. Background technique [0002] With the continuous development of the oil field, the heterogeneity of the reservoir is becoming more and more serious. A large amount of injected water scours, the clay and cement in the oil layer expand and dissolve, the migration of particles, and the sand production become heavier, which further deteriorates the geological heterogeneity. During the development process, the following problems often appear, such as: prominent plane contradictions, plane injection water rushes along the high permeability zone to form waterways; prominent interlayer contradictions, uneven production and suction profiles, and single-layer rushing phenomenon in the vertical direction. However, the current recovery of oil and natural gas is very low, so profile control an...

AI Technical Summary

Problems solved by technology

In the development process, the following problems often appear, such as: prominent plane contradictions, plane injection water rushes along the high permeability zone to form water channels; prominent interlayer contradictions, uneven production and suction profiles, and single-layer rushing phenomenon in the vertical direction

However, the current recovery of oil and natural gas is very low, so profile control and flooding operations are urgently needed to seal high-permeability layers, expand the swept area of ​​injected water, and activate residual oil production.

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