Application of variable displacement injection and leakage prevention cementing technology in KS block reservoir
Kuqa's piedmont configuration of Tarim oilfield is characterized by deeply buried reservoir,complex formation,fracture development,narrow security density window,and is very sensitive to the change of annulus pressure,which is the reason of leakage in cementing operation,poor cementing quality,and the affection of production.This article is based on the analysis of main technologies and application characteristics of traditional cementing and characteristics of plug flow cementing technology,variable displacement injection to prevent leakage of cementing technology is proposed and designed,while the adaptive evaluation of cementing method is evaluated.This method includes Reynolds number calculation,flow state discrimination,variable displacement construction parameter design,and the require-ments for annular fluid performance during variable displacement construction.According to the field experiment,construction time is effectively saved,construction risk is reduced,well leakage is prevented,and the displacement efficiency is improved by using variable dis-placement injection and leakage prevention cementing technology,which can solve the prob-lems such as formation fracture development in liner cementing,narrow safety density win-dow,and low bearing capacity of reservoir.
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