Electromagnetic Wave Near Wellbore Damage Removal
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Solution Overview
Problem
Near wellbore damage in hydrocarbon reservoirs, caused by incomplete removal of filter cake and skin damage, leads to reduced permeability and ineffective cementing operations, resulting in gas or fluid migration.
Innovation Solution
The use of electromagnetic waves, specifically microwaves, to irradiate the damaged zones, breaking down polymeric components in filter cakes, creating pressure for detachment, and increasing permeability by fracturing the rock formations, thereby removing near wellbore damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drilling fluid is used during drilling operations, then the wellbore can be stabilized and rock can be drilled, but filter cake accumulates on the wellbore surface causing near wellbore damage and reduced permeability
Solution Approach 1:
The patent replaces mechanical cleaning methods with electromagnetic radiation (microwave energy) to remove filter cake. The microwave energy heats the filter cake material, causing it to crack and detach from the wellbore surface, thereby restoring permeability without mechanical intervention.
Solution Approach 2:
The patent changes the physical state of the filter cake by applying electromagnetic energy that raises its temperature. This temperature change causes phase transitions and structural changes in the filter cake material, leading to cracking and removal, thus resolving the permeability reduction problem.
2Productivity
If microwave energy is applied to remove filter cake, then near wellbore damage is reduced and permeability increases, but energy consumption increases
Solution Approach 1:
The microwave energy is directed specifically at the filter cake layer on the wellbore surface rather than treating the entire formation. This localized application concentrates energy where needed (at the filter cake) while minimizing overall energy consumption and avoiding unnecessary heating of surrounding rock and fluids.
3Reliability
If microwave treatment is used to remove filter cake, then cementing effectiveness is improved, but the complexity of the drilling operation increases
Solution Approach 1:
The microwave generation system is integrated into the existing drilling apparatus, allowing the same equipment to perform both drilling and filter cake removal functions. This multi-functionality reduces the need for separate specialized equipment and simplifies the overall operational complexity despite adding the filter cake removal capability.
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
The method effectively removes near wellbore damage by degrading filter cakes and increasing permeability, as demonstrated by experiments showing significant regains in permeability after microwave treatments, improving well productivity.
Implementation Method 1
transmitting an electromagnetic (EM) wave to the antenna; and irradiating, from the antenna, at least a portion of the EM wave at the formation, wherein the portion of the EM wave removes the near wellbore damage at the formation
Implementation Method 2
irradiating, from the antenna, at least a portion of the EM wave at the formation, wherein the portion of the EM wave removes the near wellbore damage at the formation
Data Source
AI summary
One method includes position an antenna inside a wellbore in a location corresponding to a formation where near wellbore damage occurs; wherein the wellbore extends from a surface of a hydrocarbon reservoir downward into the subterranean structure of the hydrocarbon reservoir; transmitting an electromagnetic (EM) wave to the antenna; and irradiating, from the antenna, at least a portion of the EM wave at the formation, wherein the portion of the EM wave removes the near wellbore damage at the formation.