| 水力压裂脉冲频率对煤岩预制孔密封效果影响 |
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| 引用本文： | 骆中山,曹函,孙平贺,彭灿威,倪准林.水力压裂脉冲频率对煤岩预制孔密封效果影响[J].煤田地质与勘探,2018,46(2):190-195. |
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| 作者姓名： | 骆中山 曹函 孙平贺 彭灿威 倪准林 |
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| 作者单位： | 中南大学有色金属成矿预测与地质环境监测教育部重点实验室;中南大学地球科学与信息物理学院;西南石油大学油气藏地质及开发工程国家重点实验室 |
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| 基金项目： | 国家自然科学基金项目（41302124）；中南大学教师研究基金资助项目（201510） |
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| 摘 要： | 脉冲水力压裂技术是改造低渗储层的一种重要手段，通过水楔效应和脉冲疲劳损伤双重作用沟通裂隙网络，提高低渗储层导流能力。在脉冲水力压裂室内试验中，试样中预制孔的密封问题是决定水力压裂试验成败的关键，而起裂压力又是评价脉冲封孔段密封效果的重要指标。通过煤岩脉冲水力压裂室内试验，建立了封孔段薄弱结合面与煤岩基体力学性质的关联，研究不同频率对煤岩起裂压力的影响，最终拟合相关数据得到:基于煤岩脉冲作用下起裂压力的预制孔封孔压力经验公式。研究结果为脉冲水力压裂室内试验的试样预制孔密封提供依据。
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| 关 键 词： | 脉冲水力压裂 频率 起裂压力 封孔压力 |
| 收稿时间： | 2017-06-12 |
Influence of hydraulic fracturing pulse frequency on precasting sealing effect of coal rock |
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| Abstract: | The technology of pulsed hydraulic fracluring is an important means to transform low permeability reservoir, through the double action of water wedge effect and pulse fatigue damage, the fracture network is communicated to improve the conductivity of low permeability reservoir. In the laboratory test of pulsating hydraulic fracturing, the sealing problem of prefabricated hole in the sample is the key to determine the success of hydraulic fracturing test. The initiation pressure is also an important index to evaluate the sealing effect of pulse sealing section. In this paper, the relationship of the mechanical properties between the weak joint surface of the sealing section and coal rock is established, and the influence of different frequencies on the initiation pressure of coal rock is established, and the influence of different frequencies on the initiation pressure of coal rock is studied. Finally, based on the initiation pressure, the fitting of the damage value of initiation pressure obtained that empirical formula of prefabricated hole sealing pressure, gived a basis for sealing of pulse hydraulic fracturing. |
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