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Modeling Tracer Flowback Behaviour for a Fractured Vertical Well in a Tight Formation by Coupling Fluid Flow and Geomechanical Dynamics
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.jngse.2020.103656
Jinju Liu , Liwu Jiang , Tongjing Liu , Daoyong Yang

Abstract In this work, a pragmatic technique has been developed to describe tracer flowback behaviour for a vertically fractured well in a tight formation by coupling fluid flow and geomechanical dynamics. More specifically, the Barton-Bandis model is employed to describe the relationship between effective stress and fracture permeability, while tracer flowback profiles, which can reveal the fracture properties, are quantified by taking tracer dispersion and adsorption into account. Subsequently, this method considering two main mechanisms (i.e., tracer flow behaviour and fracture propagation dynamics) is separately validated with previous analytical solutions and then extends its application to a field case. In addition to tracer flowback concentration, the tracer recovery factor (TRF) is generated to analyze the tracer flowback behaviour. With considering geomechanics, the TRF is nearly 20% higher than that without considering geomechanics. During the flowback period, tracer concentration profiles appear to be unimodal for reservoirs with a single fracture, while tracer concentration increases quickly at the initial stage and then decreases slowly as time proceeds. An increase in matrix permeability increases tracer flowback concentration and the TRF. A larger tracer dispersion coefficient leads to earlier arrival time for the tracer flowback concentration peak together with a lower TRF. Also, the stronger the tracer adsorption is, the lower the tracer flowback concentration and the TRF will be. A higher Young's modulus results in a lower tracer flowback concentration and TRF. An increase in minimum horizontal stress increases tracer flowback concentration. Other parameters, including maximum horizontal stress, fracture closure permeability, and normal fracture stiffness, are also examined and analyzed though less sensitive.

中文翻译:

通过耦合流体流动和地质力学动力学模拟致密地层中裂缝垂直井的示踪剂返排行为

摘要 在这项工作中,开发了一种实用的技术,通过耦合流体流动和地质力学动力学来描述致密地层中垂直裂缝井的示踪剂返排行为。更具体地说,采用Barton-Bandis模型来描述有效应力与裂缝渗透率之间的关系,而可以揭示裂缝特性的示踪剂返排剖面通过考虑示踪剂扩散和吸附来量化。随后,这种考虑两种主要机制(即示踪剂流动行为和裂缝扩展动力学)的方法分别用先前的解析解进行验证,然后将其应用扩展到现场案例。除了示踪剂回流浓度外,还会生成示踪剂回收系数 (TRF) 以分析示踪剂回流行为。考虑地质力学,TRF 比不考虑地质力学的 TRF 高近 20%。在返排期间,单一裂缝储层的示踪剂浓度剖面呈单峰状,而示踪剂浓度在初始阶段迅速增加,然后随着时间的推移缓慢下降。基质渗透率的增加会增加示踪剂回流浓度和 TRF。较大的示踪剂扩散系数导致示踪剂回流浓度峰值的到达时间较早,同时 TRF 较低。此外,示踪剂吸附越强,示踪剂返排浓度和 TRF 越低。较高的杨氏模量导致较低的示踪剂回流浓度和 TRF。最小水平应力的增加会增加示踪剂回流浓度。其他参数,
更新日期:2020-12-01
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