ELECTRICALLY ACTUATED DISCONNECT APPARATUS

摘要

In drilling equipment having at least one remote assembly (62) attached to a drill string (12), an electrically actuated disconnect apparatus and method (10) for releasing the remote assembly (62) have an electric signal transmitter electrically connected to a release device (16). The release device (16) operates a retaining device (22) holdin g strainer blocking devices (24) therein. A strainer (56) is connected to the drill string (12) after the retainer (22) and through which drilling fluid flows until blocked by the strainer blocking devices (24). A one-way pressure relief mechanism (34) is provided in the drill stri ng (12) conformed to operate when the flow of drilling fluid is continued after the strainer (56) is blocked by the strainer blocking devices (24) so that drilling fluid is allowed to impact against a moveable piston (44), the moveable piston (44) to conformed to the drill string (12), and moveable to apply pressure to move a disconnect shift tube (52) so as to shift the disconnect shift tube (52) and release a coupling key (32), thereby releasing the remote assembly (64) from the drill string (12).