Downhole Asphaltene Onset Pressure Mapping
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Solution Overview
Problem
Current technologies are unable to identify asphaltenes in wellbore fluid samples during downhole operations, which hinders reliable completions planning and timely remediation efforts, ultimately affecting the production life of reservoirs.
Innovation Solution
The development of a fluid sampling tool system that allows for the identification of asphaltenes in wellbore fluid samples downhole, using sensors and a fluid analysis module to measure properties and analyze the samples, enabling the construction of an asphaltene onset pressure (AOP) map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laboratory analysis is used to identify asphaltenes, then measurement precision is improved, but loss of time increases and productivity decreases
Solution Approach 1:
The system performs preliminary asphaltene identification actions downhole before the fluid reaches the surface. Sensors detect asphaltene precipitation onset pressure in-situ, allowing early warning and real-time decision-making without waiting for surface laboratory analysis.
Solution Approach 2:
The patent replaces the mechanical laboratory analysis system with an electronic sensing system deployed downhole. Sensors detect asphaltene precipitation through optical or electrical property changes, substituting the need for physical sample transport and lab processing.
2Productivity
If downhole asphaltene identification is implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The fluid sampling tool is designed with multi-functionality, integrating sensors for asphaltene detection, pressure measurement, temperature monitoring, and fluid sampling capabilities into a single downhole assembly. This universal tool performs multiple functions without requiring separate specialized equipment.
Solution Approach 2:
The sensing elements and detection components are nested within the fluid sampling tool structure. Sensors are positioned within the tool body to detect asphaltene precipitation directly in the formation fluid, creating a compact integrated system where smaller detection components are housed within the larger sampling tool.
3Loss of time
If real-time downhole measurement is performed, then loss of time is reduced, but measurement precision may worsen due to environmental conditions
Solution Approach 1:
The patent uses an intermediary approach by measuring indirect properties of asphaltene precipitation (such as pressure changes, temperature variations, or optical properties) that correlate with asphaltene onset pressure. These intermediary measurements serve as reliable proxies for direct asphaltene detection while maintaining precision.
Solution Approach 2:
The system incorporates feedback mechanisms where sensor data is continuously monitored and compared against threshold values. When asphaltene precipitation is detected, the system provides real-time feedback signals that trigger alerts or automated responses, ensuring both timely detection and maintained measurement precision through continuous validation.
Data Source
AI summary
A method and system for disposing a fluid sampling tool into a wellbore, taking a plurality of fluid samples with the fluid sampling tool, identifying a plurality of asphaltene onset pressures (AOP) downhole based at the least on the plurality of fluid samples. The method may further comprise forming an AOP map from at least the plurality of AOPs, identifying a laboratory property from at least one of the plurality of fluid samples; and developing a relational model between at least one of the plurality of AOPs and the laboratory property. The system may include a fluid sampling tool with one or more probes for injecting the one or more probes into a wellbore and taking a plurality of fluid samples from the wellbore.