Patent ID: 7836958
Filing Date: 2010-11-23
Classification: E21B

Abstract:
1. A method of disconnecting from a bottom hole assembly within a well bore, the method comprising the steps of: (a) providing a disconnect apparatus within the well bore, the disconnect apparatus being attached to the bottom hole assembly, the disconnect apparatus comprising: a top sub having a portion comprising a collet member, said collet member extending to an engagement end, said top sub having an external seal surface; a bottom sub having an internal bore, said external seal surface and said internal bore cooperating; a support piston disposed within the collet member, said support piston having formed on an outer portion a plurality of fins, each of said fins projecting radially outward from said outer portion; wherein said collet member comprises a plurality of fingers having a gap between each of said fingers and wherein each of said fins of said piston is configured to fit within one of said gaps of said collet member; (b) causing a seal to be formed in an internal portion of the support piston; (c) applying a pressure into the internal portion of the support piston; (d) pumping the support piston into the internal bore of the bottom sub; (e) freeing said collet member from the support piston; (f) contracting the collet member so that the collet member no longer engages the top sub; (g) exerting an upward pull force on the top sub so that the top sub is disconnected from the bottom sub.