Experimental Study on the Evaluation Model of Cementing Quality for Ultra Low Density Cement Well Cluster

In order to improve the accuracy of cementing quality evaluation for ultra-low density cement, a full-scale cementing quality evaluation model well group was constructed based on the real underground environment and the requirements for cementing quality and cement filling. A calibration method for cementing quality evaluation indicators was established, and the influence of factors such as logging time and cement density on cementing quality evaluation indicators was analyzed. The results were compared with theoretical calculations, The experimental results are in good agreement with the theoretical calculation results. According to the experimental results, the evaluation indicators of ultra-low density cement cementing quality are inversely correlated with cement density & logging time. The research results indicate that the accuracy and pertinence of cementing quality evaluation can be significantly improved by applying the ultra-low density cement slurry cementing quality evaluation model well group and verifying the ultra-low density cement cementing quality evaluation indicators.