Downhole Surface Wetting Measurement Using Electrical Impedance Spectroscopy
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Solution Overview
Problem
Current well operations face challenges in determining surface wetting conditions at subterranean wellbore temperatures and pressures, leading to incomplete cement bonding and potential losses in hydrocarbon production due to oil-wetted surfaces, which affect the integrity and efficiency of wellbore operations.
Innovation Solution
The use of electrical impedance spectroscopy (EIS) to measure and simulate downhole conditions for determining surface wetting, allowing for the inference of wetting nature and quantification under pressure, temperature, and shear conditions, facilitating the design of appropriate well fluids and cementing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical impedance spectroscopy is used to measure surface wetting under simulated downhole conditions, then measurement precision of surface wetting is improved, but device complexity increases
Solution Approach 1:
The patent uses an intermediary measurement system (electrical impedance spectroscopy apparatus) that indirectly measures surface wetting properties by measuring electrical impedance characteristics. The measurement system includes a test cell with electrodes that measure impedance of the fluid-surface interface, allowing precise determination of wetting states without direct observation of the surface itself.
Solution Approach 2:
The patent measures changes in electrical impedance parameters (resistance, capacitance, conductance) as indicators of surface wetting state. By monitoring how these electrical parameters change when surfaces transition between wet and dry states, or when different fluids contact the surface, the system achieves precise wetting measurement through parameter transformation rather than direct mechanical or visual measurement.
2Reliability
If downhole conditions are simulated to determine surface wetting, then reliability of wetting determination is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent performs preliminary measurements of surface wetting under simulated downhole conditions (high temperature and pressure) before actual cementing operations. The test cell is pre-configured with heating elements and pressure systems to replicate downhole environments, allowing surfaces to be wetted and measured under conditions that match the actual operational environment, thereby ensuring reliable wetting determination.
Solution Approach 2:
The patent creates a simplified model system (test cell with electrodes and controlled fluid injection) that copies the essential features of downhole conditions. By replicating the high temperature, high pressure, and fluid-surface interaction dynamics in a controlled laboratory setting, the system makes it possible to detect and measure wetting properties that would otherwise be inaccessible in the actual downhole environment.
3Strength
If complete surface wetting is ensured for cement bonding, then strength of cement bonding is improved, but loss of time in well operations increases
Solution Approach 1:
The patent performs preliminary wetting assessments using electrical impedance spectroscopy before cementing operations to determine whether additional wetting treatments are needed. By measuring the electrical impedance characteristics of the surface-fluid interface in advance, the system identifies surfaces that require extended wetting time or additional surfactant application, allowing optimization of the wetting process to achieve complete bonding without unnecessary time delays.
Solution Approach 2:
The patent uses real-time monitoring of electrical impedance measurements during the wetting process to provide feedback on the wetting state of surfaces. As fluids contact and wet the surface, the impedance characteristics change in a measurable way, allowing the system to detect when complete wetting has been achieved and signal when it is appropriate to proceed with cementing operations, thereby minimizing unnecessary waiting time while ensuring adequate wetting.
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 method enables effective surface wetting determination, optimizing cement bonding and reducing the risk of interzonal communication and production losses by ensuring complete surface wetting, thereby enhancing the safety and economics of hydrocarbon production.
Implementation Method 1
measuring electrical impedance spectroscopy for a system simulating downhole conditions for the wetting of a surface
Data Source
AI summary
Methods and apparatuses for determining surface wetting of metallic materials at downhole wellbore condition with fixed or changing well fluids are disclosed. In general, the methods according to the disclosure include carrying out an electrical impedance spectroscopy (“EIS”) for a system simulating downhole conditions for the wetting of a surface by simultaneously dynamically moving electrodes exposed to the well fluid while measuring the changes in electrical characteristics between the electrodes.