| 摘要 |
A pressure controlling device 10 for mounting on a mandrel 14, the device comprising a flexible sealing element 22, a first support member 30 and a second support member 32 comprising a composite. The pressure controlling device may be a packer or cup. The pressure control device is adapted to move from a run in position to an expanded position when exposed to a source of pressure. The first and second support members when in an expanded position resist extrusion of the flexible sealing element, in use, along a bore wall 16. A portion of the sealing element, the first and second support members may be arranged concentrically. The first support member may comprise of a circumferential spring 32. The first support member may be urged outwardly against the bore wall to create a seal. The spring may be a helical garter spring. The first support member may be located so as to abut the second support member. The device may comprise a cammed surface to be engaged by the first support member. The cammed surface may be arranged to direct the first support member radially outward when the device is under pressure. |
