A chemical reaction heat source composition for use in downhole operations and associated apparatus and methods
AssigneeBiSN Tec Ltd
InventorsAndre Levchenko, Billy Clark, Clay Hughes, Didhiti Talapatra, Paul Carragher
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Abstract
The present invention provides a fluid chemical reaction heat source composition for use in downhole operations. The present invention also provides an ignition assembly for use in initiating the reaction of the composition in a downhole environment. The present invention also provides methods of deploying heat to a downhole target region of an oil/gas well.
Claims29
A chemical reaction heat source composition for use in downhole operations, wherein said composition, which is a fluid at the temperatures found within an oil/gas wellbore, comprises:
- an exothermic redox mixture forming 20 to 90% by weight of the composition;
- a co-oxidizing agent forming 2 to 40% by weight of the composition;
- and
- a hydrophobic carrier medium forming 5 to 50% by weight of the composition;
- wherein the exothermic redox mixture comprises a metal that forms 5 to 50% by weight of the mixture and an oxidizing reagent that forms 50 to 95% by weight of the mixture;
- and
- wherein the co-oxidizing agent oxidizes the metal of the exothermic redox mixture at a lower temperature than the oxidizing reagent.
The composition of any one of the preceding claims, further comprising a dampening agent that forms up to 30% by weight of the composition.
The composition of any one of the preceding claims, further comprising a gas absorbing agent that forms up to 30% by weight of the composition;
- and wherein the gas absorbing agent is selected from a group consisting of Bi2O3 and CaO.
The composition of any one of the preceding claims, further comprising a barrier formation additive, wherein the barrier formation additive is selected from:
- a) bismuth, tin, silver, antimony, copper, iron, zinc, aluminium, magnesium, manganese, silicon, germanium, nickel, or any combination of these materials and their oxides;
- and
- b) inorganic and organic acids such as hydrochloric acid, acetic acid, hydrofluoric acid, adipic acid, citric acid, glutaric acid, carboxylic and dicarboxylic acids, phosphoric acid, rosin, oleic acid, and steric acid;
- and
- c) materials that decompose to form acids, such as PTFE (polytetrafluoroethylene), PVC (polyvinyl chloride), and PMAA (poly methacrylic acid).
The composition of any one of the preceding claims, wherein the physical state of the composition in the downhole environment is selected from a liquid, a paste and a gel.
An ignition assembly for use in initiating a chemical reaction heat source to undergo a redox reaction in a downhole environment, said ignition assembly comprising:
- a housing containing heating means configured to generate sufficient heat energy to initiate a redox reaction in a chemical reaction heat source;
- a piston that is movable from a default position to an active position in which the piston activates the heating means;
- wherein, when the pressure acting on the exterior of the housing exceeds a predetermined level, the piston moves from the default position to the active position and activates the heating means.
Dependencies are inferred from the claim text.