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    • 6. 发明公开
    • PRESSURE CONVERTER
    • 压力转换器
    • EP0793762A1
    • 1997-09-10
    • EP95934894.0
    • 1995-10-04
    • Den Norske Stats Oljeselskap A.S.
    • NILSEN, Nils, Inge
    • E21B7E21B21
    • E21B21/00E21B7/18
    • Pressure amplifier for mounting above the drill bit at the lower end of a drill pipe for generating an increased fluid pressure in a drilling fluid flow, for example for obtaining an increased drilling effect. A reciprocating piston (6) in a cylinder (1, 2, 3) at one side (low pressure side) is designed with a large piston area (11), a first, opposite piston area (13) and a second, opposite and relatively small piston area (12) which generates an increased pressure. The valve means (4A-B) control drilling fluid flows to and from the piston. Beyond one end (2) of the cylinder (1, 2, 3) there is provided a control valve (9) with a slide (8) and an accompanying slide rod (8A) for moving the slide in the control valve. The slide rod (8A) cooperates (6A-C) with the piston (6) for repositioning the slide (8) at two end positions of the piston. The control valve (9) communicates with an actuator cylinder (19) for moving said valve means under the influence of drilling fluid pressure applied from the control valve (8).
    • 用于安装在钻杆下端的钻头上方的压力放大器,用于在钻井液流中产生增加的流体压力,例如用于获得增加的钻探效果。 在缸体(1,2,3)的一侧(低压侧)中的往复式活塞(6)设计有大活塞区域(11),第一相对活塞区域(13)和第二相对活塞区域 相对小的活塞区域(12),其产生增加的压力。 阀装置(4A-B)控制钻井液流入和流出活塞。 在气缸(1,2,3)的一端(2)之外设置有带滑块(8)和伴随的滑杆(8A)的控制阀(9),用于在控制阀中移动滑块。 滑杆(8A)与活塞(6)配合(6A-C),以在滑阀(8)的位置处重新定位活塞的两个端部位置。 控制阀(9)与致动器缸体(19)连通,以在受控制阀(8)施加的钻井液压力的影响下移动所述阀门装置。