Patent ID: 11927065
Assignee: INTERWELL P&A AS
Field: Civil engineering (Other fields)
Classification: CPC E  F  Y | IPC E  F

Claim 17:
18. A method comprising:
forming a permanent barrier in a well using a well tool device,
wherein the well tool device comprises:
a housing in which a compartment is provided;
a heat generating mixture provided within the compartment;
an ignition device adapted to heating at least a part of the heat generating mixture to an ignition temperature of the heat generating mixture;
wherein the housing comprises a lower housing section, an upper housing section, and an intermediate housing section connecting the lower housing section and the upper housing section;
wherein the intermediate housing section of the housing is made from a material being a constituent of the heat generating mixture;
wherein the lower housing section comprises a heat insulation material; and
wherein the intermediate housing section of the housing is consumed during a heat generating process started by heating at least a part of the heat generating mixture to the ignition temperature of the heat generating mixture.