Research and application of cementing technologies in low pressure and low permeability reservoirs in Daniudi gas field

Daniudi gas field is characterized by low pressure, low permeability, being prone to leakage in some well intervals and being prone to gas channeling after cementing. The problem of cementing quality was especially serious before 2004. Thorough analysis and study show that the poor performance of cement slurry system and lack of advanced technologies have influenced cementing quality. Cement slurry systems that are suitable for use in the study area are optimized through laboratory experiment and appraisal of cement slurry systems. Meanwhile, balanced cementing technologies that can prevent gas channeling are used. Gas channeling prevention performances of cement slurry and technologies are comprehensively evaluated. The quality of cementing is effectively improved.