Drainage Radius Log Generation for Reservoir Modeling
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Solution Overview
Problem
The oil and gas industry faces challenges in accurately generating drainage radius logs, which are crucial for determining the number and placement of wells to efficiently drain a reservoir, as conventional methods calculate a single value per well, leading to inefficiencies and inaccuracies.
Innovation Solution
A system and method using a computing device to calculate cumulative liquid production and fractional contribution for each well, enabling the generation of a drainage radius log per well over time, which is then used to populate 3D properties in reservoir models, enhancing drilling planning and un-swept intervals identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional methods calculate a single drainage radius value per well, then the calculation process is simplified, but the accuracy and detail of reservoir drainage representation deteriorates
Solution Approach 1:
The patent divides the reservoir into multiple depth segments and calculates drainage radius separately for each segment rather than using a single value for the entire well. This segmentation approach allows for more accurate representation of varying drainage characteristics at different depths while maintaining manageable calculation complexity through systematic processing.
Solution Approach 2:
The patent transitions from calculating a single scalar drainage radius value to generating a drainage radius log that varies with depth (adding a depth dimension). This dimensional expansion provides detailed spatial representation of drainage radius throughout the reservoir vertical profile, significantly improving accuracy while using computational methods to handle the increased data complexity.
2Ease of manufacture
If a single drainage radius value is calculated per well, then the method is easier to implement, but the ability to determine optimal well placement and number deteriorates
Solution Approach 1:
The patent applies local quality by calculating drainage radius separately for different depth segments within each well, recognizing that drainage characteristics vary locally throughout the reservoir. This localized approach provides detailed information for determining optimal well placement and spacing, improving reliability while using standardized computational procedures to maintain ease of implementation.
Solution Approach 2:
The patent generates drainage radius logs that can be updated at different times to reflect changing production conditions, making the well placement determination process dynamic rather than static. This allows for more reliable optimization of well placement as reservoir conditions evolve, while using automated computational methods to maintain implementation feasibility.
3Use of energy by moving object
If conventional single-value drainage radius calculation is used, then computational resources are conserved, but the detail and time-dependency of hydrocarbon flow representation is lost
Solution Approach 1:
The patent generates drainage radius logs at multiple time points to continuously track the evolution of drainage patterns over time. This continuous temporal representation captures detailed hydrocarbon flow information that would be lost in single-value calculations, while using efficient computational algorithms to manage resource consumption during repeated calculations at different times.
Solution Approach 2:
The patent creates detailed drainage radius log profiles that copy and represent the complex three-dimensional drainage patterns in a simplified one-dimensional depth profile format. This copying approach preserves essential flow information in a compact representation that requires fewer computational resources than full three-dimensional modeling while maintaining sufficient detail for reservoir management decisions.
Data Source
AI summary
Embodiments described herein include a system for generating a drainage radius log per well that includes a computing device that receives well data associated with a plurality of wells, utilizes the well production data to calculate a value for cumulative liquid produced by each of the plurality of wells for a predetermined time period, and utilizes at least a portion of the well data to calculate a fractional contribution for each of the plurality of wells. In some embodiments the computing device utilizes the value for cumulative liquid produced for each of the plurality of wells and the fractional contribution to calculate a cumulative liquid production for each of the plurality of wells, utilizes the cumulative liquid production to calculate the drainage radius log for each of the plurality of wells, and outputs the drainage radius log for display.