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针对目前煤矿井下水力压裂钻孔封孔理论缺乏,封孔材料密封效果差、成本高,封孔长度不合理等问题,建立了水力压裂钻孔封孔力学模型,得出封孔材料能够承受的最大水压与封孔材料性质、封孔长度等参数之间的关系。综合分析了密封条件、抽采条件以及施工条件下压裂孔的合理封孔长度,并进行现场试验验证。结果表明:封孔材料性质和封孔长度是影响封孔材料能够承受最大水压的主要因素,封孔材料能够承受的最大水压随封孔材料强度、弹性模量以及封孔长度的增大而增大;当封孔长度达到某一定值后,封孔材料能够承受的最大水压随封孔长度的增大而趋于定值。以重庆松藻矿区为例,确定出穿层压裂孔的合理封孔长度为10 m,本煤层压裂孔的合理封孔长度为13 m,现场试验结果与理论分析基本一致。
Aiming at the problems such as the lack of hole sealing theory for hydraulic fracturing in coal mines, the poor sealing effect of sealing materials, the high cost and the unreasonable length of sealing holes, a hydraulic sealing model of drilling holes was established. The relationship between the maximum pressure to be sustained and the properties of the plugging material, plugging length and other parameters. Comprehensive analysis of the sealing conditions, pumping conditions and the construction conditions of fracturing holes reasonable sealing length, and field tests. The results show that the properties of sealing material and the sealing length are the main factors affecting the sealing material can withstand the maximum water pressure. The maximum water pressure that the sealing material can withstand increases with the sealing material strength, elastic modulus and sealing length And increases; when the sealing length reaches a certain value, the sealing material can withstand the maximum water pressure tends to set the value of the sealing length increases. Taking Songzao mining area in Chongqing as an example, the reasonable length of sealing hole for piercing a fractured hole was 10 m. The length of a reasonable sealing hole for the fractured hole in this coal seam was 13 m. The field test results are in good agreement with the theoretical analysis.