Exothermic Thermochemical Fluids for Tight Gas Water Blockage Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Tight gas reservoirs face significant productivity losses due to water blockages caused by greater capillary pressure and irreducible water saturation, which existing methods struggle to effectively address, especially in lesser-permeability formations.
Innovation Solution
The application of exothermic thermochemicals downhole generates heat and pressure to reduce the viscosity of blocking fluids, increase capillary number, and vaporize water, effectively removing water blockages without causing significant damage to the reservoir.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If evaporative-alcoholic acid systems are used to promote water vaporization in lesser-pressure, lesser-permeability gas formations, then water blockage removal is improved, but chemical penetration effectiveness deteriorates
Solution Approach 1:
The patent changes the physical-chemical parameters of the treatment system by introducing exothermic thermochemical reactions that generate heat in situ. This thermal energy fundamentally alters the water blockage removal mechanism from chemical vaporization to thermal vaporization, enabling effective treatment in low-permeability formations where chemical penetration is insufficient. The heat generation temperature and reaction kinetics are key parameters that control the effectiveness of water removal.
Solution Approach 2:
The patent substitutes chemical mechanical action (surfactant-based capillary number increase) with thermal energy action (exothermic reaction-based heat generation). Instead of relying on chemicals to reduce surface tension and enable vaporization, the system uses thermally-driven water vaporization through exothermic reactions, which is more effective in low-permeability tight gas reservoirs where chemical penetration is limited.
2Ease of manufacture
If water-based drilling or completion fluids are used during well operations, then well construction is facilitated, but water blockage in the near-wellbore area is caused
Solution Approach 1:
The patent converts the harmful water blockage caused by water-based drilling fluids into a beneficial treatment opportunity. By injecting exothermic thermochemical materials that react with the formation water, the system generates heat that vaporizes the blocking water and restores permeability. The same water that caused the problem becomes the reactant that drives the solution through exothermic reactions.
Solution Approach 2:
The exothermic thermochemical materials serve as an intermediary substance that mediates between the water-based drilling fluids and the hydrocarbon production. These materials react with the formation water to generate thermal energy, which then acts as the actual mechanism for removing water blockage and restoring well productivity, rather than directly removing water through mechanical or chemical means.
3Productivity
If exothermic thermochemicals are injected to generate heat and vaporize water, then water saturation is reduced and permeability increases, but energy consumption increases
Solution Approach 1:
The exothermic thermochemical reaction system is self-service in that it generates its own thermal energy through chemical reactions between injected materials and formation water. The system uses the formation water itself as a reactant, eliminating the need for external heating equipment or additional energy input. The water that needs to be removed provides the oxygen or reacts with the thermochemical materials to generate the heat required for vaporization.
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 significantly reduces water saturation and increases permeability, enhancing hydrocarbon flow without altering porosity, thereby improving well productivity and reducing water-to-oil or water-to-gas ratios.
Implementation Method 1
an exothermic reaction component is pumped or injected into a wellbore in addition to or alternative to a formation suffering from water blockage
Implementation Method 2
generates heat and pressure to reduce the viscosity of blocking fluids, increase capillary number, and vaporize water
Implementation Method 3
vaporize water, effectively removing water blockages
Implementation Method 4
reduce the viscosity of blocking fluids, increase capillary number
Implementation Method 5
generates heat and pressure
Implementation Method 6
create microfractures in the rock of a formation
Data Source
AI summary
Methods, systems, and compositions for increasing hydrocarbon production from a wellbore where the wellbore or a nearby hydrocarbon reservoir is suffering from water blockage, one method including identifying water blockage in a rock sample of a formation via increased capillary pressure in the rock sample; formulating an exothermic reaction component to remove water blockage from a reservoir rock in situ via heat and pressure release, the reservoir rock type the same as the rock sample; injecting the exothermic reaction component into the wellbore; and allowing the exothermic reaction component to react to remove water blockage in situ to decrease capillary pressure of the reservoir rock without substantially changing porosity of the reservoir rock.