초록 ▼

An improved packing tool (P1) for sealing spaces between the wall (10) of a wellbore and means (12) defining an elongate member (e.g. tubing) disposed longitudinally in the well bore including a sealing mechanism supportable peripherally about the elongate member and including at least one element (

An improved packing tool (P1) for sealing spaces between the wall (10) of a wellbore and means (12) defining an elongate member (e.g. tubing) disposed longitudinally in the well bore including a sealing mechanism supportable peripherally about the elongate member and including at least one element (27) containing a shape memory alloy material which maintains a radially contracted condition at below a predetermined temperature－corresponding to the transition temperature of the shape memory alloy－to enable introduction of the sealing mechanism into the well bore and which responds to the temperature by transforming into a radially expanded condition to make sealing contact with the wall of the well bore, establishing a tight metal to metal seal therethrough.

대표청구항 ▼

An improved packing tool for sealing spaces between the wall of a well bore, and means defining an elongate member disposed longitudinally in the well bore comprising, substantially cylindrical metal sealing means supportable peripherally about said elongate member and a plurality of helical spring

An improved packing tool for sealing spaces between the wall of a well bore, and means defining an elongate member disposed longitudinally in the well bore comprising, substantially cylindrical metal sealing means supportable peripherally about said elongate member and a plurality of helical spring elements extending between said elongate member and the inside surface of said sealing means said sealing means and said helical spring elements containing a shape memory alloy material which maintains a radially contracted condition at below a predetermined temperature－corresponding to the transition temperature of said shape memory alloy－to enable introduction of said sealing means into said well bore and which responds to the temperature thereof rising above said transition temperature by transforming into a radially expanded condition to urge said sealing means to make sealing contact with the wall of said well bore.