Study And Application On Preventing And Plugging Flow Of Baring Pressure Agent In Zaoyuan District

Lost circulation refers to a complex situation of drilling fluid leaking into the depths of the underground formation in drilling opertion. Lost circulation will not only lose a lot of drilling time, drilling fluid and consume a large amount of lost circulation material, but also caused a series of complicated situations of the well slough, stuck pipe, well blowout and blowout. The damage is extremely serious. Therefore, the research and application of preventing and plugging flow technology are an important issue of the home and abroad engineer.Lost circulation is the result of objective and subjective factors. Formation pore and split is a prerequisite for well lost circulation. The drilling fluid density is too large or some measures which will not meet the actual conditions were taken. It cause the lost circulation occurrence induced leakage and the extent and intensity. Requirement from the leak protection point of view is a reasonable density of drilling fluid and strong inhibition, requiring construction to reduce emotional stress.Under the geological features of Zaoyuan block and the new mechanism reserch of new plugging agent, the plugging technology was changed from the traditional physical plugging to the physical s and chemical plugging in the combination. By analyzing the lost circulation formation type and formation pressure capacity, 5 different sets of plugging program were made. They applied in the field and achieved good results.The Zaoyuan block leakage plugging program was effective soluted.