滑溜水压裂主裂缝内支撑剂输送规律实验及数值模拟

发布时间：2018-08-30 16:38

【摘要】：滑溜水压裂时通过泵送大排量压裂液在储层中形成主裂缝为主干的裂缝网络,主裂缝内支撑剂的铺置状况直接影响油气井的产能。采用自主设计的大型可视化平板裂缝装置来研究大排量泵送时主裂缝内支撑剂的输送规律,建立了相应的数值模型模拟了砂堤在不同时刻的铺置形态,并分析了湍流对支撑剂铺置的影响规律,为滑溜水压裂时主裂缝内支撑剂的有效铺置提供一定的理论指导。研究表明,滑溜水压裂时支撑剂在主裂缝内的铺置规律与小排量压裂时不同:支撑剂首先在主裂缝入口处形成一个较低的砂堤,而在距入口较远处形成一个较高的砂堤,之后才一层一层周期性的覆盖在两处砂堤之上,直到达到最终的平衡高度;大排量压裂时易引起湍流,将主裂缝进口端暂时沉降的支撑剂重新卷入裂缝深处,形成类似"卷云状"的沉降结构;数值模拟与物理实验模拟得到的支撑剂铺置结果相似,证明了研究的数值模型具有一定的实用性。
[Abstract]:In the process of slippery water fracturing, the main fracture network is formed by pumping large displacement fracturing fluid in the reservoir, and the placement of proppant in the main fracture directly affects the productivity of oil and gas wells. The self-designed large visual plate fracture device is used to study the transport law of proppant in the main fracture when pumping with large displacement, and the corresponding numerical model is established to simulate the laying form of sand embankment at different times. The influence of turbulence on proppant placement is analyzed, which provides some theoretical guidance for the effective placement of proppant in main fracture during slippery water fracturing. The results show that the rule of placement of proppant in the main fracture is different from that in the case of small displacement fracturing: the proppant first forms a lower sand bank at the entrance of the main fracture, and a higher one is formed at the distance from the entrance. After that, a layer of periodic cover on two sand dikes, until the final balance height is reached; when large displacement fracturing is easy to cause turbulence, the main fracture inlet temporary settlement of the proppant into the depth of the fracture, The result of numerical simulation is similar to that of physical experiment, which proves that the numerical model is practical.
【作者单位】：西安石油大学石油工程学院;西部低渗-特低渗油藏开发与治理教育部工程研究中心;
【基金】：国家科技重大专项“低渗透致密砂岩气藏压裂裂缝及参数优化”(编号:2016ZX05050-009)
【分类号】：TE357.12

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