Influence of individual factors of the wells construction technology on break-through of reservoir fluids along the cemented space
One of the unsolved problems in wells construction of is to provide sealing of gas wells. In practice, frequent breakouts of gas through the cemented space in the process of wells development. The article shows that possibility of gas breakthrough and appearance of inter-casing pressure happens both due to drilling fluids properties, being used, and cement slurries properties. Results of field research show, that when the time of drilling fluid influence on permeable layers decreases, then possibility of inter-casing pressures occurrence increases while well drilling. Reduction of drilling rate less than 300 standard meters per month allows not to be so strict to the rate of cement stone formation in the well. Increase of drilling rate more than 500 standard meters per month requires strict control over permeable formations blocking by drilling fluids, as well as over such parameter of cement slurry as the rate of cement stone formation.