| 董长银*,高凯歌,周崇,智勤功,李怀文,张清华.防砂井挡砂介质堵塞规律实验及堵塞程度定量预测模型[J].实验力学,2017,32(3):351~360 |
| 防砂井挡砂介质堵塞规律实验及堵塞程度定量预测模型 |
| Experimental Study of Sand Retaining Media Plugging Pattern in Sand Control Well and Quantitative Prediction Model for Plugging Degree |
| 投稿时间：2016-03-20 修订日期：2016-05-29 |
| DOI：10.7520/1001-4888-16-047 |
| 中文关键词: 防砂 砾石充填 挡砂介质 堵塞规律 堵塞程度 预测模型 堵塞实验 |
| 英文关键词:sand control gravel packing sand retaining media plugging pattern plugging degree prediction model plugging experiment |
| 基金项目: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)” |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| Production dropping due to sand retainling media plugging in sand control well has become a key problem for oil and gas wells. A large number of plugging pattern studies carried out before are focused on mechanism and qualitative description, have not yet formed a practicable quantitative prediction method for plugging degree and permeability. To solve this problem, under the condition of widely applied gravel packing for sand control, using sand retaining media evaluating displacement experimental device, an experiment of gravel plugging mechanism and plugging pattern was carried out. Its focus is on the quantitative variation relation of gravel clogging permeability ratio with production conditions, such as displacement time, median ratio of gravel sand, fluid flow rate, fluid viscosity, clay content and fine matter content etc. Based on experimental data, a quantitative relation between the permeability ratio of gravel packing layer and the time was first fitted. Then, the influence of various production conditions on the plugging pattern was characterized by introducing comprehensive plugging coefficient and single plugging coefficients, respectively. Finally, an empirical quantitative model for predicting the variation relation between gravel packing layer plugging degree and time was obtained based on different production conditions and sand parameters. Results show that under different production conditions, gravel layer permeability decreases rapidly in the early stage of production, then is slow down and tends to basically no longer change, finally to achieve a balance state. The concrete change pattern is controlled by sand control parameters and the production conditions. The model application case analysis was made by using the data from actual sand control well, the results and the variation pattern are basically consistent with the actual field data respectively. After further revision, this model can be used to predict and evaluate the dynamic capacity of sand prevention well. |
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