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Integrated Simulation for Hydraulic Fracturing, Productivity Prediction, and Optimization in Tight Conglomerate Reservoirs
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-09-02 , DOI: 10.1021/acs.energyfuels.1c02161 Shangui Luo 1 , Yulong Zhao 1 , Liehui Zhang 1 , Zhangxin Chen 2 , Xuyang Zhang 3
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-09-02 , DOI: 10.1021/acs.energyfuels.1c02161 Shangui Luo 1 , Yulong Zhao 1 , Liehui Zhang 1 , Zhangxin Chen 2 , Xuyang Zhang 3
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With the development of advanced horizontal drilling and multistage hydraulic fracturing techniques, the productivity of unconventional tight oil such as that found in the Baikouquan Formation of the Mahu Sag in the Junger Basin has been increasing. The Mahu oilfield is the largest tight conglomerate reservoir in the world. However, predicting the productivity of fractured horizontal wells in tight oil remains a challenge due to the high heterogeneity of the reservoir and complexity of its hydraulic fractures. Therefore, this study proposes a workflow for coupled geological modeling, along with fracturing and reservoir simulations in tight conglomerate reservoirs. Taking well block Ma131 as an example, a three-dimensional geological model is first built according to the results of geophysical research. The unconventional fracture modeling is used next to establish a fracturing simulation. Given the lack of natural fractures and the high concentration of conglomerate in the study area, the method of the multiple groups of microscale natural fractures is used to simulate the impact of gravel on fracture propagation. The feasibility of the method is verified with microseismic monitoring data and treating curves. Thereafter, an unstructured grid and the INTERSECT reservoir simulator are used to simulate the production performance of horizontal wells. The stress sensitivity effect of the rock matrix and fractures and the changes in the formation flow field caused by fracturing are considered in the reservoir simulation. Hydraulic fractures are found to be unable to form complex fracture networks easily under the conditions of high stress difference, high gravel content, and undeveloped natural fractures. However, they show the characteristics of macroscopic simplicity and local branching. Reducing cluster spacing can increase the complexity of hydraulic fractures and the productivity of horizontal wells. Finally, the proposed integrated simulation process is used to optimize well spacing, fracturing stimulation parameters, and the production system. Overall, the study serves as a guide for maximizing the production and economic benefits of tight conglomerate reservoirs.
中文翻译：
致密砾岩油藏水力压裂、产能预测和优化集成模拟
随着先进水平钻井和多级水力压裂技术的发展，准格尔盆地玛湖凹陷百口泉组等非常规致密油产能不断提高。玛湖油田是世界上最大的致密砾岩油藏。然而，由于储层的高度非均质性和水力压裂的复杂性，预测致密油压裂水平井的产能仍然是一个挑战。因此，本研究提出了耦合地质建模的工作流程，以及致密砾岩储层中的压裂和储层模拟。以马131井区为例，首先根据地球物理研究成果建立三维地质模型。接下来使用非常规裂缝建模来建立压裂模拟。考虑到研究区缺乏天然裂缝，砾岩含量高，采用多组微尺度天然裂缝的方法模拟碎石对裂缝扩展的影响。通过微震监测数据和处理曲线验证了该方法的可行性。此后，使用非结构化网格和 INTERSECT 油藏模拟器来模拟水平井的生产动态。储层模拟考虑了岩石基质和裂缝的应力敏感性效应以及压裂引起的地层流场变化。发现水力裂缝在高应力差条件下不易形成复杂的裂缝网络，砾石含量高，天然裂缝未发育。然而，它们表现出宏观简单和局部分支的特点。减小簇间距可以增加水力压裂的复杂性和水平井的产能。最后，建议的集成模拟过程用于优化井距、压裂增产参数和生产系统。总体而言，该研究可为致密砾岩储层的生产和经济效益最大化提供指导。建议的集成模拟过程用于优化井距、压裂增产参数和生产系统。总体而言，该研究可为致密砾岩储层的生产和经济效益最大化提供指导。建议的集成模拟过程用于优化井距、压裂增产参数和生产系统。总体而言，该研究可为致密砾岩储层的生产和经济效益最大化提供指导。
更新日期：2021-09-16
中文翻译：
致密砾岩油藏水力压裂、产能预测和优化集成模拟
随着先进水平钻井和多级水力压裂技术的发展，准格尔盆地玛湖凹陷百口泉组等非常规致密油产能不断提高。玛湖油田是世界上最大的致密砾岩油藏。然而，由于储层的高度非均质性和水力压裂的复杂性，预测致密油压裂水平井的产能仍然是一个挑战。因此，本研究提出了耦合地质建模的工作流程，以及致密砾岩储层中的压裂和储层模拟。以马131井区为例，首先根据地球物理研究成果建立三维地质模型。接下来使用非常规裂缝建模来建立压裂模拟。考虑到研究区缺乏天然裂缝，砾岩含量高，采用多组微尺度天然裂缝的方法模拟碎石对裂缝扩展的影响。通过微震监测数据和处理曲线验证了该方法的可行性。此后，使用非结构化网格和 INTERSECT 油藏模拟器来模拟水平井的生产动态。储层模拟考虑了岩石基质和裂缝的应力敏感性效应以及压裂引起的地层流场变化。发现水力裂缝在高应力差条件下不易形成复杂的裂缝网络，砾石含量高，天然裂缝未发育。然而，它们表现出宏观简单和局部分支的特点。减小簇间距可以增加水力压裂的复杂性和水平井的产能。最后，建议的集成模拟过程用于优化井距、压裂增产参数和生产系统。总体而言，该研究可为致密砾岩储层的生产和经济效益最大化提供指导。建议的集成模拟过程用于优化井距、压裂增产参数和生产系统。总体而言，该研究可为致密砾岩储层的生产和经济效益最大化提供指导。建议的集成模拟过程用于优化井距、压裂增产参数和生产系统。总体而言，该研究可为致密砾岩储层的生产和经济效益最大化提供指导。
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