用机器学习预测油田产量,不依赖复杂地质模型。
Data-driven models for production forecasting and decision supporting in petroleum reservoirs
- 基于产注量等简单数据构建数据驱动预测模型。
- 在巴西盐下区块真实数据上验证,可准确捕捉动态变化。
- 适合需要快速决策的油田管理场景。
可靠预测产量并预判岩-流系统行为变化,是石油藏工程的主要挑战。本项目提出采用数据驱动方法与机器学习技术解决该问题,旨在仅依据产出/注入量及井口仪表数据,无需依赖地质模型、流体性质或完井细节,即可预测生产参数。首先对产注变量进行相关性分析,并进行数据校准以适应问题需求。由于储层状态随时间演变,概念漂移成为关键关注点,需特别研究观测窗口选择与模型定期重训练周期。针对产量预测,比较了回归与神经网络等监督学习方法,在性能与复杂度之间寻找最优方案。初期使用UNISIM III组分模拟模型生成的合成数据评估方法有效性;随后应用于巴西盐下区块的真实开发案例。目标是构建一个能快速响应、处理井口与处理单元限制等实际难题的可靠预测器,支持油藏管理决策,包括识别有害行为、优化产注参数及分析概率事件影响,最终实现原油采收率最大化。
原文摘要 · Abstract (English)
Forecasting production reliably and anticipating changes in the behavior of rock-fluid systems are the main challenges in petroleum reservoir engineering. This project proposes to deal with this problem through a data-driven approach and using machine learning methods. The objective is to develop a methodology to forecast production parameters based on simple data as produced and injected volumes and, eventually, gauges located in wells, without depending on information from geological models, fluid properties or details of well completions and flow systems. Initially, we performed relevance analyses of the production and injection variables, as well as conditioning the data to suit the problem. As reservoir conditions change over time, concept drift is a priority concern and require special attention to those observation windows and the periodicity of retraining, which are also objects of study. For the production forecasts, we study supervised learning methods, such as those based on regressions and Neural Networks, to define the most suitable for our application in terms of performance and complexity. In a first step, we evaluate the methodology using synthetic data generated from the UNISIM III compositional simulation model. Next, we applied it to cases of real plays in the Brazilian pre-salt. The expected result is the design of a reliable predictor for reproducing reservoir dynamics, with rapid response, capability of dealing with practical difficulties such as restrictions in wells and processing units, and that can be used in actions to support reservoir management, including the anticipation of deleterious behaviors, optimization of production and injection parameters and the analysis of the effects of probabilistic events, aiming to maximize oil recovery.
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