US 12,312,904 B2
Down-hole chemical heater and methods of operating such
Paul Carragher, Lymm (GB)
Assigned to BiSN Tec Ltd., Warrington (GB)
Filed by BiSN Tec Ltd., Warrington (GB)
Filed on Jul. 20, 2023, as Appl. No. 18/224,521.
Application 18/224,521 is a continuation of application No. 16/304,262, granted, now 11,753,897, previously published as PCT/GB2017/051445, filed on May 24, 2017.
Claims priority of application No. 1609137 (GB), filed on May 24, 2016; and application No. 1614227 (GB), filed on Aug. 19, 2016.
Prior Publication US 2023/0358113 A1, Nov. 9, 2023
Int. Cl. E21B 33/13 (2006.01); E21B 33/134 (2006.01); E21B 36/00 (2006.01)
CPC E21B 33/13 (2013.01) [E21B 33/134 (2013.01); E21B 36/00 (2013.01); E21B 36/008 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of forming alloy based plugs in downhole environments with restricted access, said method comprising:
deploying one or more chemical heater units into a target region within a downhole environment, wherein each heater unit comprises a chemical heat source and a remotely operable ignitor enclosed within a flexible elongate shape;
deploying a bismuth-based alloy shot into the target region so that it flows around said one or more heater units; and
remotely activating the heater units so that they generate heat and melt the alloy shot.