防喷器是开采高产油气井的关键设备之一。实际上就是封闭油井钢管与钻杆之间环形空间的截止阀,见图1。双闸板防喷器正中为一与井管直通的圆孔,以容钻杆上下。上下各有一长方横孔,以容两对端部有半圆缺口与橡皮密封垫的闸板,由液压缸控制启闭,故内腔成 Blowout preventer is the production of high-yield well one of the key equipment. Actually closed the oil well pipe and the annular space between the cut-off valve, shown in Figure 1. Double ram blowout preventer in the middle of a straight hole with the well pipe to accommodate the drill pipe up and down. Up and down have a rectangular cross-hole to accommodate two pairs of semicircular end of the gap and rubber gasket gate, controlled by the hydraulic cylinder opening and closing, so the cavity into