防砂井挡砂介质堵塞规律实验及堵塞程度定量预测模型

发布时间：2018-11-22 18:34

【摘要】：防砂井挡砂介质堵塞造成降产已成为困扰油气井防砂的关键问题。已开展的大量堵塞规律研究主要涉及机理和定性描述,尚未形成可用的堵塞程度定量预测方法。针对这一问题,本文在广泛应用的砾石充填防砂条件下,利用挡砂介质堵塞评价驱替实验装置,进行了砾石层堵塞机理和规律实验,着重考察了砾石层堵塞渗透率比随驱替时间、砾砂中值比、流体流速、流体粘度、粘土含量、细质含量等生产条件的定量变化规律。根据实验数据,首先拟合砾石充填层堵塞渗透率比随时间的定量关系,引入综合堵塞系数和单项堵塞系数表征各生产条件对堵塞规律的影响,然后拟合了堵塞系数与各生产参数的经验关系,整合得到一个根据防砂参数和生产条件预测砾石充填层堵塞程度随时间变化规律的定量模型。结果表明,不同生产条件砾石层渗透率在投产早期下降较快,然后下降速度减缓并趋于基本不再变化,达到堵塞平衡状态。具体变化规律由防砂参数和生产条件控制。使用实际防砂井资料进行了模型应用案例分析,结果和规律与现场实际基本相符。该模型进一步修正后可用于防砂井动态产能预测与评价。
[Abstract]:The key problem of sand control in oil and gas wells is to reduce production due to blocking of sand control medium in sand control wells. A large number of studies on blockage law have been carried out, which are mainly concerned with mechanism and qualitative description, and no available quantitative prediction method for clogging degree has yet been developed. In order to solve this problem, in this paper, under the condition of gravel filling and sand control, the mechanism and regularity of gravel plugging are tested by using sand blocking medium to evaluate the displacement experimental device. The quantitative variation law of plugging permeability ratio with displacement time, median ratio of gravel and sand, fluid velocity, fluid viscosity, clay content, fine content, etc. According to the experimental data, the quantitative relationship of plugging permeability ratio with time was first fitted, and the comprehensive plugging coefficient and single plugging coefficient were introduced to characterize the influence of each production condition on the clogging law. Then the empirical relationship between plugging coefficient and production parameters is fitted and a quantitative model is developed to predict the variation of plugging degree with time according to sand control parameters and production conditions. The results show that the permeability of gravel layer in different production conditions decreases rapidly at the early stage of production, then slows down and tends to remain unchanged, reaching the state of blockage equilibrium. The specific variation rule is controlled by sand control parameters and production conditions. The model application case analysis is carried out using the actual sand control well data. The results and rules are basically consistent with the field practice. The modified model can be used to predict and evaluate the dynamic productivity of sand control wells.
【作者单位】：中国石油大学(华东)石油工程学院;中石化胜利油田分公司石油工程技术研究院;中国石油大港油田公司石油工程技术研究院;
【基金】：国家自然科学基金“疏松砂岩油气藏水平井管外地层砾石充填机理及模拟基础研究(51374226)”
【分类号】：TE358.1

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