Cutting Device, Safety Valve, Method and Uses for Severing a Pipe-String-Related Object in a Safety Valve for a Well

摘要

A cutting device, safety valve and method are for severing an object in the safety valve for a well, wherein the cutting device is structured for incorporation in the safety valve. The cutting device and the safety valve comprise a housing having a through bore structured for passing the object therethrough.;The cutting device/safety valve comprises at least one induction coil device disposed in the housing, and around at least a portion of the bore of the housing.;The induction coil device is directed inwards in the direction of the bore and is structured for optional, cutting-promoting heating, hence thermal structural weakening, of the object when located vis-à-vis the induction coil device.;The induction coil device is structured in a manner allowing it to be connected to at least one electric power source for supply of electric power for heating.;The housing comprises a heat-insulating portion disposed between the induction coil device and the housing.

主权项

1. A cutting device for severing a pipe-string-related object in a safety valve for a well, wherein the cutting device is structured for incorporation in the safety valve, and wherein the cutting device comprises a housing having a through bore structured for passing said object therethrough, wherein the cutting device comprises at least one induction coil device disposed in said housing, and around at least a portion of the bore of the housing;
wherein said induction coil device is directed inwards in the direction of the bore; wherein the induction coil device is structured for optional, cutting-promoting heating, hence thermal structural weakening, of the object when located vis-à-vis the induction coil device; wherein the induction coil device is structured in a manner allowing it to be connected to at least one electric power source for supply of electric, power for said heating; and wherein the housing comprises a heat-insulating portion disposed between the induction coil device and the housing.