Close the annularblowoutpreventer as the well pressure is relatively low and force oil pipes and couplings to pass through rubber core of the annularblowoutpreventer.
井压较低时，关闭环型防喷器，使油管和接箍强行通过环型防喷器胶芯。
2
The annular BOP is the important assembly of the blowoutpreventer control system.