Downhole Fluid Property Logging for Tar Mat Detection
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Solution Overview
Problem
Current drilling and completion methods face challenges in accurately and efficiently placing well bores and well systems relative to reservoir characteristics such as tar mats, salt domes, and other formations, often requiring costly and time-consuming surface analysis of fluid samples.
Innovation Solution
The method involves measuring fluid properties like compositional data using downhole tools and wireline logging to identify variations associated with specific reservoir characteristics, allowing for real-time or near-real-time detection and targeting of these characteristics during drilling operations, thereby determining optimal well system placement without the need for extensive surface analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface analysis of fluid samples is used to identify reservoir characteristics, then detection capability is provided, but time consumption and operational costs increase significantly
Solution Approach 1:
The patent introduces an intermediary substance (contrast agent or tagging material) that is injected into the formation and allows remote detection of reservoir characteristics. This intermediary enables the detection system to identify tar mats, salt domes, and other formations from a distance without requiring direct contact or surface sampling, thereby reducing time consumption while maintaining detection precision.
Solution Approach 2:
The patent replaces the mechanical process of surface sampling and laboratory analysis with an electromagnetic detection system. By using electromagnetic signals to detect the presence of contrast agents in the formation, the system eliminates the need for physical sample retrieval and surface analysis, significantly reducing operational time while maintaining accurate identification of reservoir characteristics.
2Measurement precision
If surface analysis methods are used to locate reservoir characteristics, then detection is achieved, but operational costs increase
Solution Approach 1:
The contrast agent serves as an intermediary that enables remote detection through electromagnetic signals. This approach eliminates costly surface sampling operations, laboratory analysis fees, and repeated trips to the surface, thereby reducing operational costs while maintaining the ability to accurately identify reservoir characteristics such as tar mats and salt domes.
Solution Approach 2:
The formation itself becomes the detection medium by containing the contrast agent that emits detectable electromagnetic signals. This self-service approach allows the formation to provide its own detection data without requiring external surface analysis operations, thereby reducing operational costs associated with sample retrieval and laboratory processing.
3Productivity
If conventional drilling methods are used without real-time fluid property measurement, then drilling operations proceed at normal speed, but accuracy in placing well bores relative to reservoir characteristics decreases
Solution Approach 1:
The patent enables continuous measurement of fluid properties during drilling operations by injecting contrast agents and continuously monitoring electromagnetic signals. This continuous detection provides real-time data on reservoir characteristics, allowing the drilling operation to maintain normal speed while simultaneously achieving accurate well placement by adjusting the drilling path based on ongoing measurements.
Solution Approach 2:
The system provides feedback by continuously monitoring electromagnetic signals from contrast agents in the formation and using this information to guide well placement decisions. The real-time feedback loop allows drillers to adjust the well trajectory to accurately target reservoir characteristics such as tar mats and salt domes without slowing down the drilling operation.
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 enables more accurate, efficient, and cost-effective placement of well bores and systems by reliably identifying reservoir characteristics at a greater distance and with fewer false positives, reducing operational delays and costs associated with surface analysis.
Implementation Method 1
measuring a compositional property of a downhole fluid at two or more depths in the borehole
Data Source
AI summary
Systems and methods for placing well bores and/or portions of completed well systems in a subterranean formation relative to tar mats or other phenomena in the formation are provided. In some embodiments, the methods comprise: identifying a reservoir characteristic associated with a chemical or physicochemical property of a fluid in or proximate to the reservoir characteristic; measuring the property of a fluid in at least a portion of a subterranean formation in two or more locations in the subterranean formation; identifying a variation of the property of the fluid at one or more of the locations in the subterranean formation; and determining a target location or direction for a portion of a well system based at least in part on the variation of the property of the fluid, the well system comprising a borehole penetrating the subterranean formation.