Multi-Tubing Wellbore Simulation With Numerically Coupled Pseudo-Wells
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Solution Overview
Problem
Standard reservoir simulators fail to explicitly model fluid flow within wellbores, especially when multiple independent fluid flow paths interact, necessitating the use of lookup tables that limit the simulation's accuracy and flexibility.
Innovation Solution
Model multi-tubing wells as standalone pseudo-wells in a reservoir simulator, numerically coupling them via a common discretized wellbore embedded in an augmented simulation grid, allowing for explicit modeling of fluid dynamics using non-neighbor connections between grid cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lookup tables are used to incorporate well performance in reservoir simulation, then the simulation can be executed in standard reservoir simulators, but the simulation accuracy and flexibility are limited
Solution Approach 1:
The wellbore is segmented into multiple discrete intervals or grid cells along its length. Each segment can have its own fluid properties, pressure, and flow characteristics. This segmentation allows the complex wellbore system to be broken down into manageable computational units that can be individually modeled and then integrated, improving simulation accuracy while maintaining computational feasibility in standard reservoir simulators.
2Adaptability or versatility
If multiple independent fluid flow paths are explicitly modeled within the wellbore, then the fluid dynamics can be accurately captured, but the device complexity and computational requirements increase
Solution Approach 1:
The wellbore model is designed to handle multiple operating modes and fluid flow paths through a unified numerical framework. The same basic model structure can represent single-tubing wells, multi-tubing wells, injection wells, production wells, or any combination thereof. This multi-functionality allows the model to adapt to various well configurations and operating conditions without requiring separate specialized models, thereby improving versatility while controlling complexity.
Solution Approach 2:
A numerical interface or coupling mechanism is introduced to connect the wellbore model with the reservoir simulator. This intermediary layer handles the complex interactions between multiple fluid flow paths, allowing explicit modeling of wellbore dynamics while maintaining compatibility with standard reservoir simulation software. The interface translates wellbore-specific calculations into formats that the reservoir simulator can process, enabling accurate multi-path flow modeling without overwhelming system complexity.
3Measurement precision
If specialized simulation software is used to model wellbore fluid dynamics, then the modeling accuracy improves, but the ease of operation and accessibility are reduced
Solution Approach 1:
The wellbore modeling capabilities are merged with standard reservoir simulation software through numerical coupling. Instead of requiring separate specialized software, the wellbore model is integrated directly into the reservoir simulator framework. This combination allows users to access accurate wellbore fluid dynamics modeling through existing, widely-available reservoir simulation tools, thereby improving measurement precision while maintaining ease of operation and software accessibility.
Data Source
AI summary
Techniques for modeling a reservoir include identifying a model of a wellbore that includes at least two tubing strings that are open in the wellbore and one or more fluid connections between the wellbore and a reservoir; assigning each of the at least two tubing strings as a single string pseudo-well in the model of the wellbore; numerically coupling the single string pseudo-wells together in the wellbore model; determining one or more well parameters for the modeled wellbore; and executing the modeled wellbore in a reservoir simulator to determine one or more wellbore fluid flow characteristics.