US 12,291,942 B2
System and method for forming a permanent barrier in a well
Torgeir Rusten, Vikhammer (NO); and Stian Tøndel, Trondheim (NO)
Assigned to INTERWELL P&A AS, Hafrsfjord (NO)
Appl. No. 18/275,923
Filed by Interwell P&A AS, Hafrsfjord (NO)
PCT Filed Mar. 10, 2022, PCT No. PCT/EP2022/056115
§ 371(c)(1), (2) Date Aug. 4, 2023,
PCT Pub. No. WO2022/194654, PCT Pub. Date Sep. 22, 2022.
Claims priority of application No. 20210355 (NO), filed on Mar. 19, 2021.
Prior Publication US 2024/0117711 A1, Apr. 11, 2024
Int. Cl. E21B 33/12 (2006.01); E21B 36/00 (2006.01)
CPC E21B 36/008 (2013.01) [E21B 33/1204 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A well tool system for forming a permanent barrier in a well, the system comprising:
a well tool device comprising a pyrotechnic mixture and an ignition device provided within or adjacent to the pyrotechnic mixture, wherein the pyrotechnic mixture comprises a first constituent in the form of a metal oxide and a second constituent in the form of a metal;
a tool string connected above the well tool device;
an elevating device connected to the well tool device via the tool string; and
a replenishment string connected between the well tool device and the tool string,
wherein the replenishment string comprises the first constituent and/or the second constituent;
wherein the elevating device, after a heat generating process is started by means of the ignition device, is configured to control the movement of the replenishment string towards the heat generating process;
wherein the well tool system comprises a setting tool provided between the replenishment string and the well tool device, wherein the setting tool is configured to disconnect the replenishment string from the well tool device;
wherein the well tool device comprises an anchoring device for anchoring of the well tool device to the well; and
wherein the setting tool is configured to radially expand the anchoring device of the well tool device before disconnecting the replenishment string from the well tool device.