Research of Fuzzy Comprehensive Evaluation Model for Displacement Efficiency of Cementing

The quality of cementing directly impacts on oil or gas well lifespan and production capacity of well. The direct reason of bad quality of cementing is inefficient displacement efficiency. Factors which are affecting the efficiency of displacement efficiency including: the middle situation of cases, displacement fluid status, contact time, drilling fluid properties, isolating fluid status. One theory of fuzzy mathematic-fuzzy comprehensive evaluation methodology and Model M (·, +) have been applied to built fuzzy comprehensive evaluation model of cementing displacement efficiency within this paper. That can comprehensively appraisal the factors which impact displacement efficiency, therefore, achieve the evaluation for cementing quality.