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arXiv 2203.07524cs.LG
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用于鲁棒优化和闭环油藏管理的卷积-循环神经网络代理

Convolutional-Recurrent Neural Network Proxy for Robust Optimization and Closed-Loop Reservoir Management

Stanford University(斯坦福大学)

Yong Do Kim, Louis J. Durlofsky

摘要:

在地质不确定性下的生产优化在计算上是昂贵的,因为必须在多个地质实现上评估大量的井控计划。在这项工作中,开发了一种卷积循环神经网络(CNN-RNN)代理模型,用于针对给定的时变井底压力(BHP)计划,针对集合中的每个实现来预测逐井的油和水流量。这种能力使鲁棒优化所需的目标函数和非线性约束值的估计。代理模型代表了最近开发的长短期记忆(LSTM)RNN代理的扩展,该代理旨在预测单个地质模型的井率。这里引入了CNN来处理渗透性实现,这为RNN提供了初始状态。CNN-RNN代理使用300组不同的BHP计划和渗透率实现的模拟结果进行训练。我们通过多个实现的三维多高斯渗透率模型,证明代理精度的油水流动。代理,然后被纳入到一个闭环油藏管理(CLRM)的工作流程,在那里它是用粒子群优化和基于过滤器的非线性约束满足的方法。历史匹配是使用伴随梯度为基础的程序。代理模型显示,在五个不同的(合成)“真”模型的这种设置中表现良好。随着约束满足和不确定性减少CLRM观察到改进的净现值。对于健壮的生产优化步骤,代理提供了O(100)的运行时加速基于模拟的优化。

英文摘要:

Production optimization under geological uncertainty is computationally expensive, as a large number of well control schedules must be evaluated over multiple geological realizations. In this work, a convolutional-recurrent neural network (CNN-RNN) proxy model is developed to predict well-by-well oil and water rates, for given time-varying well bottom-hole pressure (BHP) schedules, for each realization in an ensemble. This capability enables the estimation of the objective function and nonlinear constraint values required for robust optimization. The proxy model represents an extension of a recently developed long short-term memory (LSTM) RNN proxy designed to predict well rates for a single geomodel. A CNN is introduced here to processes permeability realizations, and this provides the initial states for the RNN. The CNN-RNN proxy is trained using simulation results for 300 different sets of BHP schedules and permeability realizations. We demonstrate proxy accuracy for oil-water flow through multiple realizations of 3D multi-Gaussian permeability models. The proxy is then incorporated into a closed-loop reservoir management (CLRM) workflow, where it is used with particle swarm optimization and a filter-based method for nonlinear constraint satisfaction. History matching is achieved using an adjoint-gradient-based procedure. The proxy model is shown to perform well in this setting for five different (synthetic) `true' models. Improved net present value along with constraint satisfaction and uncertainty reduction are observed with CLRM. For the robust production optimization steps, the proxy provides O(100) runtime speedup over simulation-based optimization.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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