取心管取心过程管壁温度测定试验研究
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摘要
为了确定低温冷冻取心技术中冷冻剂量,依托自制的测温装置对取心管取心过程中取心管壁温度进行全程测量记录,分析取心管壁的温度变化,研究钻头及取心管壁和煤层摩擦的产热情况。结果表明:在取心过程中取心管壁经历温度缓慢上升、快速上升和缓慢下降3个阶段;随取样深度的增大,取心管壁所能达到的最高温度增加,试验中最高温度出现在取心深度为30m时的煤样采集过程中,温度为98.32℃;同一取心深度,取心过程进钻所需时长小于退钻所需时长,进钻时的升温速率高于退钻时的降温速率;不同取心深度,采集煤样所需时间基本一致。
To determine the refrigeration dosage in frozen coring technology, the temperature of core tube wall during coring process is measured and recorded by self-made temperature measuring device. The temperature change of core tube wall is analyzed, and the friction heat situation between drill bit and core tube wall and coal seam is studied. The results show that the core tube wall undergoes three stages, slow temperature rise, rapid temperature rise and slow temperature drop. With the increase of the sampling depth, the maximum temperature of the core tube wall increases. The highest temperature in this test occurs in the coal sample collection process when the core depth is 30 m, and the temperature is 98.32 ℃. At the same core depth, the time required for drilling is less than that required for withdrawal, and the heating rate during drilling is higher than the cooling rate during withdrawal.
To determine the refrigeration dosage in frozen coring technology, the temperature of core tube wall during coring process is measured and recorded by self-made temperature measuring device. The temperature change of core tube wall is analyzed, and the friction heat situation between drill bit and core tube wall and coal seam is studied. The results show that the core tube wall undergoes three stages, slow temperature rise, rapid temperature rise and slow temperature drop. With the increase of the sampling depth, the maximum temperature of the core tube wall increases. The highest temperature in this test occurs in the coal sample collection process when the core depth is 30 m, and the temperature is 98.32 ℃. At the same core depth, the time required for drilling is less than that required for withdrawal, and the heating rate during drilling is higher than the cooling rate during withdrawal.
引文
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[3]王兆丰,谢策,祁晨君,等.低温对煤中瓦斯放散的抑制作用[J].煤矿安全,2016,47(6):16-19.
[4]王兆丰,岳高伟,康博,等.低温环境对煤的瓦斯解吸抑制效应试验[J].重庆大学学报,2014(9):106-112.
[5]Beste U,Hartzell T,Engqvist H,et al.Surface damage on cemented carbide rock-drill buttons[J].Wear,2001,249(3):324-329.
[6]Babur Ozcelik,Eyup Bagci.Experimental and numerical studies on the determination of twist drill temperature in dry drilling:A new approach[J].Materials and Design,2006,27:920-927.
[7]Babur Ozcelik,Eyup Bagci.Investigation of the effect of drilling conditions on the twist drill temperature during step-by-step and continuous dry drilling[J].Materials and Design,2006,27:446-454.
[8]杨晓峰,李晓红,卢义玉,等.灰岩钻掘过程的红外热像试验[J].吉林大学学报(地球科学版),2011,41(5):1504-1511.
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