Method for evaluating stability of replaced interface

Abstract

The invention discloses a method for evaluating stability of a replaced interface, comprising steps of obtaining measurement information of multiple flow rate measuring devices arranged at a low side orderly along the flowing direction; according to the measurement information, orderly determining the length increase amount of the corresponding replaced interface corresponding to every flow rate measuring device; determining the stability of the replaced interface according to the length increase of the replaced interface corresponding to the flow rate measuring device. From the view of physical modeling, the method of evaluating the stability when a two-phase fluid replaced interface in the replacement of a horizontal well section is fingered to the low side with positive density contrast; the method can qualitatively evaluate the stability of the replaced interface. The method can be used for evaluating the influence rules of the geological parameter, fluid rheological property, density, displacement, and other parameters on the replaced interface stability; the method is simple and reliable, and strong in operability.

Description

technical field [0001] The invention relates to the field of well cementing technology, in particular to a method for evaluating the stability of a displacement interface in cementing displacement of a horizontal well section when the low side of positive density difference is fingering. Background technique [0002] The displacement efficiency of cementing in the horizontal well section has a very important influence on the evaluation of cementing quality. The displacement efficiency is closely related to the morphology of the displacement interface, and the morphology of the displacement interface mainly depends on the length of the displacement interface. Generally speaking, the shorter the interface length during the displacement process, the better the displacement, the higher the displacement efficiency and the better the cementing quality. However, due to the limitation of research technology and testing level, the research on cementing displacement interface is stil...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: there is no method in the prior art for evaluating the stability of the displacement interface in the cementing displacement of the horizontal well section when the positive density difference low side is fingering, and the positive density difference low side cannot be obtained more accurately. Stability Law of Displacement Interface under Fingering Condition

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