US 11,053,771 B2
Downhole fishing tool
Paul Carragher, Lymm (GB)
Assigned to BiSN Tec Ltd., Warrington (GB)
Filed by BiSN Tec Ltd, Warrington (GB)
Filed on Jun. 2, 2019, as Appl. No. 16/429,037.
Application 16/429,037 is a continuation of application No. 15/309,789, granted, now 10,309,187, previously published as PCT/GB2015/052346, filed on Aug. 14, 2015.
Claims priority of application No. 1414565 (GB), filed on Aug. 15, 2014.
Prior Publication US 2020/0056443 A1, Feb. 20, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 31/00 (2006.01); E21B 33/122 (2006.01); E21B 33/124 (2006.01); E21B 33/12 (2006.01); E21B 36/00 (2006.01); E21B 29/10 (2006.01); E21B 17/042 (2006.01); E21B 33/13 (2006.01); E21B 41/00 (2006.01); E21B 19/00 (2006.01); E21B 33/14 (2006.01); E21B 43/10 (2006.01)
CPC E21B 33/122 (2013.01) [E21B 17/042 (2013.01); E21B 19/00 (2013.01); E21B 29/10 (2013.01); E21B 31/007 (2013.01); E21B 33/124 (2013.01); E21B 33/1208 (2013.01); E21B 33/13 (2013.01); E21B 33/14 (2013.01); E21B 36/008 (2013.01); E21B 41/00 (2013.01); E21B 43/10 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An oil or gas well fishing tool, said tool comprising:
a receptacle for positioning in a well defining an opening at a first end and defining an interior, the interior having an interior surface;
a second end of the receptacle for receiving a line; an alloy provided within the interior of the receptacle, wherein the alloy is a eutectic alloy, a bismuth alloy or both; wherein the alloy comprises a layer and the layer of the alloy is provided on the interior surface of the receptacle; and
a heater, wherein the heater comprises an ignition element and a layer of a chemical heat source located between the receptacle and the alloy layer and the heater is associated with the allow to heat and thereby melt the alloy; thereby defining the oil and gas well fishing tool.