Method and apparatus for evacuating drilling fluids from a well

摘要: A method of evacuating drilling fluids from between axially spaced well packers in which a circulating joint is disposed the packer tubing string penetrating both packers. Pressure applied to unblock ports through joint, allowing circulation into area and out shorter only upper packer. After circulation, pressure long causing be closed. The comprises tubular body with its walls sleeve assembly surrounding blocking ports. Expansible chambers are employed first then block them again upon selective introduction chambers.