A production-based model for a fractured well in unconventional reservoirs
A production-based model for a fractured well in unconventional reservoirs
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DOI：
10.1016/j.petrol.2021.109036
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发表时间：
2021-07-09
影响因子：
--
通讯作者：
Acheaw, Emmanuel
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文献类型：
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作者：
Mohammed, Shaibu;Anumah, Prosper;Acheaw, Emmanuel
由于常规油气藏的枯竭和对能源的高需求，在可预见的未来，非常规油气藏将成为世界能源的主要来源。不幸的是，由于非常规油藏复杂的储存和流动机制，非常规油藏的建模和分析一直是非常具有挑战性的。虽然已经提出了半解析和数值模型，但这些模型依赖于一些简化的假设，并且需要几个输入参数。本文提出了一个基于产量的模型来分析和预测非常规油藏(特别是致密油藏和页岩油藏)的裂缝井动态。该模型假定指数截止值为拉长的幂函数。当幂函数项控制暂态周期时，由指数衰减叠加而成的伸展指数项控制边界主导的流动周期。因此，该模型能够同时匹配数据的瞬变状态和边界主导流动部分。该模型已用数值数据进行了验证，并应用于多个现场数据。将该模型的计算结果与其他已有模型进行了比较。结果表明，所提出的模型给出了较好的估计值，并与瞬变和边界主导流动周期相匹配。提出的模型有助于改进非常规油藏压裂井动态分析和预测的持续努力。
Due to the depletion of conventional reservoirs and the high demand of energy, unconventional reservoirs will be relied on to supply the world's energy for the foreseeable future. Unfortunately, because of their complex storage and flow mechanisms, modelling and analysis of unconventional reservoirs have been very challenging. Although semi-analytical and numerical models have been proposed, these models rely on somewhat simplifying assumptions and require several input parameters. In this paper, a production-based model is proposed to analyze and predict a fractured-well performance in unconventional reservoirs (specifically, tight and shale reservoirs). The model assumes a power law with a stretched exponential cut-off. While the power-law term governs the transient-state period, the stretched exponential term, which is a superposition of exponential decays, governs the boundary-dominated flow period. As a result, the model is capable of matching both the transient state and boundary-dominated flow portions of the data. The model has been validated with a numerical data and applied to several field data. Results of the model have been compared with other existing models. The findings show that the proposed model yields relatively good estimates, and matches both the transient and boundary-dominated flow periods. The proposed model may contribute to the ongoing efforts to improve the analysis and forecasting of fractured-well performance in unconventional reservoirs.