Downhole Emulsion Stability Measurement via Light Transmittance
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Solution Overview
Problem
Current methods for downhole fluid analysis in wellbores face challenges in characterizing the stability of emulsions formed by mixed formation fluids, which is crucial for evaluating hydrocarbon reservoirs and designing related systems, as existing techniques lack efficient means to measure emulsion stability in real-time and under reservoir conditions.
Innovation Solution
A downhole fluid analysis method and apparatus that captures formation fluids in a segregated state, mixes them to create an emulsion, and then measures light transmittance as the fluids segregate to derive a transition time period characterizing emulsion stability, using a circulation pump, pressure control, and light detection within a flow loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluid analysis methods are used, then fluid sampling and testing can be performed, but real-time emulsion stability measurement under reservoir conditions cannot be achieved
Solution Approach 1:
The patent performs preliminary emulsification of formation fluids within the downhole tool before measurement, creating a controlled emulsion sample that maintains reservoir conditions. This preliminary action allows the system to characterize emulsion stability under actual reservoir conditions rather than after surface retrieval, where conditions change and stability characteristics are altered.
Solution Approach 2:
The patent replaces conventional mechanical sampling and surface-based analysis with an optical measurement system that uses light transmittance detection. The light source and detector measure emulsion stability through optical properties, substituting mechanical handling with non-intrusive optical characterization that maintains reservoir conditions throughout the measurement process.
2Loss of information
If formation fluids are sampled and brought to surface for analysis, then fluid composition can be determined, but emulsion stability under reservoir conditions is lost
Solution Approach 1:
The system performs preliminary emulsion creation and stability characterization downhole before the fluids are brought to surface. By creating the emulsion and measuring its stability characteristics in-situ at reservoir conditions, the system preserves the emulsion stability information that would otherwise be lost during the time-consuming process of fluid retrieval and surface analysis.
Solution Approach 2:
The downhole tool performs self-characterization of emulsion stability using integrated light sources and detectors. The system serves its own measurement needs by containing the entire emulsion creation and characterization process within the downhole environment, eliminating the need to transport fluids to surface facilities for stability analysis.
3Measurement precision
If light transmittance measurement is implemented, then emulsion stability can be characterized, but additional downhole equipment is required
Solution Approach 1:
The downhole tool is designed with multi-functionality, integrating formation fluid sampling, emulsion creation through mixing mechanisms, and optical measurement capabilities within a single device. This universal approach allows the same tool to perform multiple functions (fluid capture, mixing, and light transmittance measurement) rather than requiring separate specialized equipment for each function.
Solution Approach 2:
The patent uses light as an intermediary medium to characterize emulsion stability. Instead of directly measuring physical separation or using complex mechanical sensors, the system introduces light as a mediator that interacts with the emulsion structure, allowing stability characterization through optical transmittance changes that are easier to measure and interpret.
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
Enables the characterization of emulsion stability by measuring the transition time period, providing valuable insights into fluid properties and behavior, which aids in evaluating hydrocarbon reservoirs and designing appropriate systems for flow, separation, and metering.
Implementation Method 1
mixed into an emulsified state by activating a means for circulating and mixing the fluids in the chamber
Implementation Method 2
light is transmitted into the segregating fluids and light transmittance through the segregating fluids is measured by a light detector
Implementation Method 3
Water-in-crude oil emulsion destabilization basically involves three steps, namely, flocculation, followed by sedimentation of water droplets due to density differences
Implementation Method 4
light transmittance through the segregating fluids is measured by a light detector
Data Source
AI summary
A method (and corresponding apparatus) for downhole fluid analysis of petroleum formation fluids. The method includes capturing in a chamber of a downhole tool at least two immiscible formation fluids in a generally segregated state (the fluids including petroleum), activating a fluid mixing means to mix the fluids in the chamber to create an emulsion therefrom, and allowing the emulsified fluids to segregate while measuring light transmittance through the segregating fluids in order to calculate a transition time period based on the light transmittance through the fluids in the chamber. The transition time period is preferably bounded by the time required for the light transmittance values measured by the light detector to reach a baseline light transmittance. The transition time period characterizes the stability of an emulsion formed by the captured fluids. The methods and apparatus can also be used for other fluid testing applications beyond downhole formation fluid testing.