Propped Fracture Conductivity Evolution under a Combination of Compaction and Embedment: Establishing a Model and Analyzing the Influencing Factors
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摘要: 为了研究支撑剂压实与嵌入双重作用下压裂裂缝导流能力的变化规律，基于孔隙压缩性理论与固体接触理论，建立了考虑压实与嵌入双重作用的压裂裂缝导流能力模型，利用建立的模型对前人的压裂裂缝导流能力实验数据进行了拟合，并对模型参数分布规律及其影响因素进行了讨论分析。研究发现，该模型可以较好地描述压实与嵌入双重作用下压裂裂缝导流能力的变化规律；支撑剂充填层初始孔隙体积压缩系数体现了支撑剂充填层孔隙的压缩性，其值越大，压裂裂缝导流能力变化越大；支撑剂充填层初始孔隙体积压缩系数变化率的绝对值越大，压缩系数变化越大。研究认为，压实与嵌入双重作用下压裂裂缝导流能力模型可以预测压裂裂缝导流能力及其变化规律。Abstract: In order to study the variation laws of hydraulic fracture conductivity under dual action of proppant compaction and embedment,a model of propped fracture conductivity considering combined effect of compaction and embedment was constructed.The model built on on pore compressibility theory and solid contact theory, which were also used to fit the data obtained from previous hydraulic fracture conductivity experiments.The distribution laws and influencing factors on model parameters were also discussed. The results show that the model presented here can reasonably describe the variation laws of propped fracture conductivity under the dual action of proppant compaction and embedment.The compressibility coefficient of original pore volume reveals the pore compressibility of the proppant layer.The higher compressibility coefficient will present greater variation of fracture conductivity.Larger variation of the absolute compressibility coefficient of original pore volume leads to greater change of the compressibility coefficient.The established model of hydraulic fracture conductivity under the combined compaction and embedment provides the theoretical basis for forecasting the variation laws of hydraulic fracture conductivity.
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Keywords:
- hydraulic fracture /
- proppants /
- fracture conductivity /
- compaction effect /
- embedment /
- calculation model
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