Selective Oxidizer Heat Generation for Paraffin Control
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Solution Overview
Problem
Current methods for removing paraffin and asphaltene deposits in oil wells are limited in depth and safety, as they often require surface-generated heat that loses energy en route to the wellbore, and existing oxidizers like hydrogen peroxide pose explosion hazards due to oxygen production.
Innovation Solution
A system using selective oxidizers non-reactive with alkane chemistry, delivered with a non-alkane fuel, which reacts downhole to generate heat safely and efficiently, accompanied by acid solutions to manage reaction products and inhibit deposits, extending the depth of effective treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If surface-generated heat is used to remove paraffin and asphaltene deposits, then the treatment can be applied, but the heat loses energy en route to the wellbore and is limited in effective depth
Solution Approach 1:
The patent replaces the mechanical/thermal system of surface-generated heat transport with a chemical system that generates heat in-situ downhole through oxidation reactions. This substitution eliminates energy loss during heat transport and extends effective treatment depth to the full wellbore depth, as heat is generated directly at the target location rather than being transported from the surface.
Solution Approach 2:
The system enables self-service by allowing the wellbore environment itself to generate the required thermal energy through controlled oxidation reactions between injected oxidizer and formation hydrocarbons. The formation provides both the fuel and the reaction environment, eliminating the need for external heat sources and extending effective treatment to greater depths.
2Temperature
If traditional oxidizers like hydrogen peroxide are used for downhole reactions, then heat can be generated in-situ, but explosion hazards arise due to oxygen production
Solution Approach 1:
The patent employs an inerting strategy by using oxidizers that do not produce free oxygen during decomposition, thereby eliminating the explosive atmosphere hazard. The oxidation reactions are conducted in an environment where oxygen is consumed rather than generated, removing the primary condition for explosion and enabling safe in-situ heat generation at greater concentrations and depths.
Solution Approach 2:
The system uses strong oxidants such as permanganates, perchromates, and persulfates that can drive oxidation reactions effectively without producing free oxygen. These oxidants provide the necessary oxidative power for heat generation while maintaining safety by avoiding oxygen evolution, thus resolving the contradiction between reaction effectiveness and explosion hazard.
3Productivity
If deeper wellbore treatment is attempted with conventional methods, then hydrocarbon recovery may increase, but the methods become less effective due to energy loss and safety constraints
Solution Approach 1:
The replacement of surface heat transport with in-situ chemical heat generation fundamentally changes the depth-dependence of treatment effectiveness. By generating heat directly at the wellbore bottom and along the flow path, the system maintains reliable performance at greater depths where conventional thermal methods fail due to energy loss, thereby extending productive treatment depth.
Solution Approach 2:
The system changes the fundamental parameter of heat delivery from external thermal input to internal chemical energy conversion. This parameter change enables treatment at greater depths by converting chemical energy of oxidizers directly into thermal energy at the target location, overcoming the depth limitations imposed by thermal conduction and convection losses in conventional methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances hydrocarbon production by safely delivering thermal energy deep into the wellbore, reducing wax viscosity and asphaltene deposits, thereby increasing hydrocarbon recovery and operational safety.
Implementation Method 1
reaction of selective oxidizers and non-alkane fuels which are injected into a wellbore to react at or near a bottom hole location
Implementation Method 2
thermally stimulating the wellbore, lower production tubing and near wellbore region, reducing the viscosity of paraffin wax or asphaltenes present
Data Source
AI summary
A method, apparatus and composition for safe energy delivery down hole resulting in increased recovery of subterranean hydrocarbons. The method utilizes, for example, the reaction of non-alkane fuels and selective oxidizers which are non-selective toward alkane chemical compounds. The method further utilizes an acid solution reaction with aforementioned reaction for elimination of any insoluble products of reaction permitting flow within formation strata. The energy released in the subterranean reaction is utilized to heat the production tubing, the wellbore, the formation or the formation hydrocarbons thereby lowering fluid viscosity and permitting greater flow especially for heavy oils, asphaltene deposits and/or paraffin deposits. Further, safe delivery of oxidizers can be accomplished without limit on depth as the selective oxidizer may be delivered to point of use down hole as most all formations of interest contain primarily alkane hydrocarbons and will not react with the non-alkane selective oxidizer.