压裂过程中瞬态井筒-地层耦合温度场半解析模型
发布时间：2018-07-31 16:06
【摘要】：压裂过程中,井筒温度的变化会影响压裂液到达井底时的流变性以及在地层中的滤失性,准确预测井筒及地层温度分布可以指导施工方案的设计。关于压裂过程井筒温度场的研究主要集中在数值模型方面,目前还没有合适的解析模型。文中在Hasan采气井筒瞬态传热解析模型的基础上建立了压裂过程井筒瞬态传热方程,通过Laplace变换进行求解,消除了Hasan采用稳态假设求解温度梯度所引起的高排量时的误差,使之能够准确地模拟压裂过程的瞬态井筒温度。通过与Hasan模型和数值模型的对比,验证了该方程的准确性。结果显示,在相同精度下Hasan模型计算效率远高于数值模型。之后,通过将井筒瞬态解析解与地层二维瞬态传热数值解结合,建立了压裂过程瞬态井筒-地层耦合温度场半解析模型,并应用该模型分析了排量及注入温度对压裂井筒-地层温度场的影响。
[Abstract]:In the process of fracturing, the change of wellbore temperature will affect the rheology of fracturing fluid when it reaches the bottom of the well and the filtration property in the formation. The accurate prediction of wellbore and formation temperature distribution can guide the design of construction plan. The research of wellbore temperature field in fracturing process is mainly focused on numerical model, but there is no suitable analytical model at present. Based on the analytical model of transient heat transfer in Hasan gas production wellbore, the transient heat transfer equation of wellbore in fracturing process is established. The equation is solved by Laplace transform, and the error caused by high displacement caused by Hasan using steady state assumption to solve temperature gradient is eliminated. It can accurately simulate the transient wellbore temperature during fracturing. The accuracy of the equation is verified by comparison with Hasan model and numerical model. The results show that the computational efficiency of Hasan model is much higher than that of numerical model under the same precision. Then, by combining the transient analytical solution of wellbore with the numerical solution of two-dimensional transient heat transfer in formation, a semi-analytical model of transient wellbore / formation coupling temperature field in fracturing process is established. The effect of displacement and injection temperature on temperature field of fracturing wellbore-formation is analyzed by using this model.
【作者单位】： 中国石油大学(北京)石油工程教育部重点实验室;
【基金】：中国石油天然气股份公司项目“致密砂岩油藏超临界CO_2压裂增产机理与工艺技术研究”(JS14-W-14-JZ-10-17)
【分类号】：TE357.1
本文编号：2156093
[Abstract]:In the process of fracturing, the change of wellbore temperature will affect the rheology of fracturing fluid when it reaches the bottom of the well and the filtration property in the formation. The accurate prediction of wellbore and formation temperature distribution can guide the design of construction plan. The research of wellbore temperature field in fracturing process is mainly focused on numerical model, but there is no suitable analytical model at present. Based on the analytical model of transient heat transfer in Hasan gas production wellbore, the transient heat transfer equation of wellbore in fracturing process is established. The equation is solved by Laplace transform, and the error caused by high displacement caused by Hasan using steady state assumption to solve temperature gradient is eliminated. It can accurately simulate the transient wellbore temperature during fracturing. The accuracy of the equation is verified by comparison with Hasan model and numerical model. The results show that the computational efficiency of Hasan model is much higher than that of numerical model under the same precision. Then, by combining the transient analytical solution of wellbore with the numerical solution of two-dimensional transient heat transfer in formation, a semi-analytical model of transient wellbore / formation coupling temperature field in fracturing process is established. The effect of displacement and injection temperature on temperature field of fracturing wellbore-formation is analyzed by using this model.
【作者单位】： 中国石油大学(北京)石油工程教育部重点实验室;
【基金】：中国石油天然气股份公司项目“致密砂岩油藏超临界CO_2压裂增产机理与工艺技术研究”(JS14-W-14-JZ-10-17)
【分类号】：TE357.1
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