脉冲射流割缝控制压裂技术关键参数研究及应用

doi:10.11799/ce202201011

Abstract

Abstract: In order to solve the problems that crack propagation for conventional hydraulic fracturing is affected by in-situ stress, which leads to single expansion form and formation of a blank zone of permeability enhancement on both sides of crack, this paper studied the control fracturing technology with pulse jet slotting in underground coal mine by considering the high rock-breaking efficiency of pulse jet and the induce effect of slot and pore water pressure. In this paper, through analyzing the impact stress wave effect, the rock-breaking and slotting mechanism of pulse jet by utilizing the water-hammer pressure fully was studied. The principle of control fracturing with pulse jet slotting to significantly improve the coal seam permeability was clarified. The key technical parameters, including jet slotting pressure, implementation pressure of control fracturing, and sealing length of the fracturing hole, were theoretically investigated. And the technological process of control fracturing with pulse jet slotting was discussed. Next, the three field tests of control fracturing, conventional fracturing and traditional borehole drainage, were carried out in a coal mine in Southwest China. And the gas extraction effects of three kinds of technologies were compared and analyzed. The results show that the control fracturing with pulse jet slotting could reduce the pressure of coal seam fracturing due to the pressure relief and pore pressure field. Through analyzing the change rules of gas content and water content of coal at different distances after fracturing, it was concluded that the influence range of control fracturing technology was far beyond the conventional fracturing, increasing by about 33%. The gas drainage quantity of single borehole was 0.034 m3/min after conducting the control fracturing, increasing by 3.7 times and 10.6 times higher than those of the conventional hydraulic fracturing and traditional borehole drainage; the gas drainage concentration was about 73%, which increased by 1.7 times and 2.25 times. The field test results show that the control fracturing with pulse jet slotting can achieve the long-term and high-efficiency extraction of coal gas, which provides the reference for the high-efficiency gas extraction in deep buried coal mines with low permeability.

CLC Number:

TD712+.6

Jun RenFeng. Research on key technical parameters of control fracturing with pulse jet slotting and its application[J]. Coal Engineering, 2022, 54(1): 63-69.

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Research on key technical parameters of control fracturing with pulse jet slotting and its application

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