Current status and development of working equipment under pressure

Pressurized operation is an advanced downhole operation technology that maintains a certain pressure in the wellbore, does not pressure (wash) the well, and does not release the pressure. The pipe string is raised and lowered, and the stimulation measures are implemented. The main advantage is that it can greatly reduce Pollution to the formation and energy loss, high efficiency, safety and reliability, and can meet the requirements of energy saving and emission reduction at the well site. Pressure operation technology has been widely used abroad, and a series of pressure operation devices have been developed, and a relatively complete Supporting technology system. Corresponding research has also been carried out in China, gradually popularized and applied, and certain results have been achieved.