【摘要】 在油藏储层保护和产能评价工作中,储层岩石应力敏感性评价是重要依据。稠油油藏的开采常伴随着储层温度的变化,从而影响储层渗透率特性。但目前的应力敏感模型并未考虑温度的影响,为了提高产能预测精度,推导出一个考虑温度因素的改进模型并进行了参数敏感性评价,在提出的新模型中,运用三种修改方法以更好地描述实际情况:将热膨胀系数理解为非线性;区分了岩石体积膨胀与骨架膨胀;提出将热应力和围压相结合的调制系数R。通过实验验证,分别在25、40、80℃条件下进行实验,新模型与旧模型相比,拟合相关系数提升8%～10%。可以得出,新模型修正了旧模型高估或低估的偏差,达到较好的拟合效果,对油藏产能评价及建立油藏渗流模型具有积极意义。更多还原

【Abstract】 The evaluation of reservoir rock stress sensitivity is an important basis in reservoir protection and productivity evaluation. The recovery of heavy oil reservoir is often accompanied by the change of reservoir temperature, which affects the characteristics of reservoir permeability. However, the influence of temperature is not taken into account in the current stress sensitivity model. In order to improve the accuracy of productivity prediction, an improved model was deduced considering temperature factors and evaluates the sensitivity of parameters. In the proposed new model, three modification methods were used to better describe the actual situation. The thermal expansion coefficient was understood as nonlinear. The rock volume expansion and skeleton expansion were distinguished. The modulation coefficient R which combines thermal stress and confining pressure was proposed. Through the experimental verification, the experiments were carried out at 25 ℃, 40 ℃ and 80 ℃ respectively. Compared with the old model, the fitting correlation coefficient of the new model increased by 8% and 10%. It can be concluded that the new model corrects the deviation of overestimation or underestimation of the old model and achieves a better fitting effect, which is of positive significance to the evaluation of reservoir productivity and the establishment of reservoir percolation model.更多还原