Downhole Fluid Analysis Module with Pressure Control
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Solution Overview
Problem
Conventional downhole fluid analysis methods face challenges in maintaining the integrity of formation fluid samples during transportation to the surface, leading to phase separation and compositional changes, which hinders accurate characterization and delays data availability, necessitating real-time analysis capabilities.
Innovation Solution
Integration of a pressure and volume control unit (PVCU) within a downhole fluid analysis module that isolates formation fluids in a flowline, allowing for precise control of pressure and volume changes, enabling real-time characterization of fluid properties like composition, gas-oil ratio, and phase behavior at or near downhole conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If formation fluid samples are transported to the surface for laboratory analysis, then comprehensive sample analysis can be performed, but phase separation and compositional changes occur during transportation
Solution Approach 1:
The patent introduces a downhole fluid analysis module as an intermediary system that performs fluid characterization downhole before transportation. This module includes sensors and analysis equipment that measure fluid properties in-situ, eliminating the need to transport actual fluid samples to the surface while still providing comprehensive analysis capabilities.
Solution Approach 2:
The patent replaces the mechanical transportation system with a downhole analysis system. Instead of physically moving fluid samples from the wellbore to surface laboratories, the system uses downhole sensors and analysis equipment to characterize fluids at their location, substituting mechanical transport with in-situ measurement.
2Productivity
If samples are transferred from one container to another during transportation, then samples can be conveyed from wellsite to laboratory, but sample damage and spoilage occur during transfer
Solution Approach 1:
The patent extracts the fluid sampling and transportation function from the overall analysis process. By implementing downhole fluid analysis, the system eliminates the sampling, containment, and transportation steps entirely, keeping the fluid analysis function downhole while removing the harmful transfer operations.
3Measurement precision
If comprehensive laboratory analysis is performed on formation fluid samples, then accurate fluid characterization can be achieved, but analysis time increases to weeks or months
Solution Approach 1:
The patent performs preliminary fluid characterization downhole before the fluid reaches the surface. By conducting initial analysis in-situ using downhole sensors and equipment, the system provides rapid preliminary results immediately, while more detailed analysis can follow later without delaying critical decision-making.
Solution Approach 2:
The patent replaces the slow mechanical transportation and laboratory analysis system with electronic sensing and downhole analysis equipment. This substitution enables real-time or near-real-time data acquisition, eliminating the weeks or months delay associated with physical sample transport and laboratory processing.
4Stability of the object's composition
If pressure and temperature of samples are maintained during transportation, then representative samples can be obtained, but additional equipment and complexity are required
Solution Approach 1:
The patent introduces downhole sensors and analysis equipment as intermediaries that measure fluid properties in-situ under downhole conditions. This eliminates the need for complex pressure and temperature maintenance systems during transportation, as the fluids are characterized before any transportation occurs.
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 ensures accurate, reliable, and timely fluid characterization, reducing sample damage and delay, providing real-time answer products at the wellsite with improved stability and precision compared to surface laboratory analysis.
Implementation Method 1
a pressure and volume control unit (PVCU) that is integrated with the flowline such that pressure and volume changes to isolated formation fluids are possible under downhole conditions
Implementation Method 2
a pump, such as a syringe-type pump, that is operatively connected with the flowline such that characteristics of the formation fluids isolated in the PVCU may be varied by varying volume of the fluids
Implementation Method 3
a circulation pump may be provided on the looped flowline such that the isolated formation fluids may be circulated
Data Source
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AI summary
Methods and apparatus for downhole analysis of formation fluids by isolating the fluids from the formation and/or borehole in a pressure and volume control unit that is integrated with a flowline of a fluid analysis module and determining fluid characteristics of the isolated fluids. Parameters of interest may be derived for formation fluids in a static state and undesirable formation fluids may be drained and replaced with formation fluids that are suitable for downhole characterization or surface sample extraction. Isolated formation fluids may be circulated in a loop of the flowline for phase behavior characterization. Real-time analysis of the fluids may be performed at or near downhole conditions.