Tracer-Based Wellbore Logging for Deep Fluid Saturation
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Solution Overview
Problem
Conventional well bore logging tools have limited depth of investigation, making it difficult to accurately measure fluid properties within hydrocarbon reservoirs, as the measurements are often not representative of the entire reservoir due to drilling and production processes altering the reservoir environment, leading to incomplete data for facility planning and production optimization.
Innovation Solution
A well bore logging tool that injects a tracer into the hydrocarbon reservoir, extracts a portion, and analyzes it using a scanning device to determine fluid saturation properties, providing more comprehensive data on pore fluid properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional well bore logging tools are used, then the measurement process is simple, but the depth of investigation is limited to only a few feet or inches from the well bore wall
Solution Approach 1:
A tracer is introduced as an intermediary substance that is injected into the hydrocarbon reservoir, allowed to interact with pore fluids over an extended period, and then retrieved for analysis. This mediator enables indirect measurement of fluid properties at greater distances from the well bore wall, effectively extending the depth of investigation without requiring the logging tool itself to reach those distances.
Solution Approach 2:
The tracer is injected and allowed to distribute throughout the reservoir pore spaces before retrieval. This preliminary action of introducing the tracer early in the process allows it to reach remote areas of the reservoir and interact with pore fluids, providing information from regions that would be inaccessible to conventional logging tools.
2Measurement precision
If measurements are taken close to the well bore wall, then the measurement process is quick and easy, but the fluid properties measured are not representative of the entire reservoir
Solution Approach 1:
The tracer serves as a mediator that distributes throughout the reservoir pore spaces, interacting with pore fluids across a wide area. When retrieved and analyzed, it provides compositional information that is representative of the entire reservoir rather than just the immediate well bore vicinity, achieving better representativeness without requiring extended measurement time.
Solution Approach 2:
Instead of physically measuring fluid properties at multiple locations throughout the reservoir, the tracer acts as a copy mechanism - it distributes throughout the reservoir, interacts with pore fluids, and then is retrieved as a representative sample. This copying approach provides comprehensive reservoir information without the time-consuming process of direct multi-location measurements.
3Productivity
If drilling and production processes continue, then hydrocarbon production is maintained, but the reservoir environment near the well bore is altered making measurements unrepresentative
Solution Approach 1:
The tracer is extracted from the conventional logging process and introduced as a separate substance that can interact with pore fluids independently of the drilling and production operations. This extraction allows the measurement process to occur without interference from well bore alterations, as the tracer distributes throughout the reservoir and is then retrieved for analysis away from the disturbed well bore zone.
Solution Approach 2:
The tracer acts as an intermediary that bridges the gap between ongoing production operations and accurate measurement needs. It is injected during or between production cycles, distributes throughout the reservoir unaffected by well bore alterations, and provides representative fluid property data that reflects the true reservoir state rather than the altered near-well bore environment.
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 more accurate measurements of fluid properties within hydrocarbon reservoirs, improving the planning and operation of oil or gas fields by providing representative data for facility design and production strategies.
Implementation Method 1
a scanning device may be configured to read a value of at least one fluid saturation property detected by the tracer
Data Source
AI summary
A well bore logging tool for measuring a pore fluid property of a hydrocarbon reservoir that may include, a tool housing, a vessel containing a tracer, a launcher attached to the vessel that may be configured to inject a tracer into the hydrocarbon reservoir. The well bore logging too may further include a retrieval device configured to extract at least a portion of the tracer from the hydrocarbon reservoir. The well bore logging too may further include a storage canister may be configured to store a portion of the tracer extracted from the hydrocarbon reservoir, and a scanning device may be configured to read a value of at least one fluid saturation property detected by the tracer. The vessel, launcher, retrieval device, storage canister, and scanning device may be enclosed in a tool housing.