| 井下穿层长钻孔水力压裂强化增透技术 |
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| 引用本文： | 牟全斌.井下穿层长钻孔水力压裂强化增透技术[J].中国安全生产科学技术,2017,13(8):164-169. |
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| 作者姓名： | 牟全斌 |
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| 作者单位： | （中煤科工集团西安研究院有限公司，陕西 西安 710054） |
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| 摘 要： | 为了提高井下低透气性煤层瓦斯抽采效果，提出井下穿层长钻孔水力压裂强化增透技术。根据水力压裂施工工艺和关键技术，将水力压裂过程分为准备阶段、高压注水阶段和保压阶段，重点阐述了封孔、试压、注水压裂、数据监测、保压、排水等关键技术。同时分析了长钻孔水力压裂增透机理，并进行了水力压裂强化增透试验。根据压裂过程中压裂参数变化规律，从煤储层参数和钻孔瓦斯抽采参数方面综合考察了试验效果。结果表明:压裂后煤层透气性系数提高了2.67倍，最大影响半径达到了58 m，抽采流量和抽采体积分数分别是普通压裂钻孔的24.4倍和10.27倍，最大压裂影响半径提高了2.32倍。
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| 关 键 词： | 低透煤层 穿层长钻孔 水力压裂 增透 抽采效果 |
Strengthened permeability enhancement technology by hydraulic fracturing for underground layer-through long borehole |
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| MOU Quanbin.Strengthened permeability enhancement technology by hydraulic fracturing for underground layer-through long borehole[J].Journal of Safety Science and Technology,2017,13(8):164-169. |
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| Authors: | MOU Quanbin |
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| Affiliation: | (CCTEG Xi'an Research Institute, Xi'an Shaanxi 715400, China) |
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| Abstract: | In order to improve the gas drainage effect of the underground coal seam with low permeability, the strengthened permeability enhancement technology by the hydraulic fracturing for underground layer-through long borehole was put forward. According to the construction process and key technologies of hydraulic fracturing, the process of hydraulic fracturing was divided into the preparation stage, the high pressure water injection stage and the pressure holding stage, and the key technologies were illustrated with emphasis, including hole sealing, pressure test, water injection and fracturing, data monitoring, pressure holding, water draining, etc. The permeability enhancement mechanism of hydraulic fracturing for long borehole was analyzed, and the strengthened permeability enhancement experiments of hydraulic fracturing were carried out. The experimental effect was comprehensively investigated from the aspects of coal reservoir parameters and borehole gas drainage parameters according to the change laws of fracturing parameters in the fracturing process. The results showed that the permeability coefficient of coal seam increased by 2.67 times after fracturing, the maximum influence radius reached 58 m, the drainage flow and drainage volume fraction was 24.4 times and 10.27 times of the ordinary fracturing borehole respectively, and the maximum influence radius of fracturing increased by 2.32 times. |
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| Keywords: | coal seam with low permeability layer-through long borehole hydraulic fracturing permeability enhancement drainage effect |
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