| 摘要 |
An apparatus for retrieving an object from a wellbore has been invented having an inner body and a longitudinal fluid flow bore therethrough, and at least one lateral flow bore therethrough, the bottom end having an opening suitable for receiving therein a fluid actuable member disposed for reciprocation with respect to the inner body, bias apparatus contacting the fluid actuable member for moving the fluid actuable member with respect to the inner body, and the fluid actuable member disposed so that the bias apparatus can push the fluid actuable member down to contact a plurality of fingers and move them into the longitudinal flow bore to engage the object in the wellbore when insufficient fluid pressure is present to overcome force of the bias apparatus in the fluid actuable member. |
