煤矿井下随钻无源水力增压器及性能分析
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中图分类号：TD712.6 文献标志码：A
Passive hydraulic intensifier for while-drilling operations in underground coal mines and itsperformance analysis
TIAN Hongjie1.2 （1.China Coal Research Institute，Beijing10o013，China; 2.CCTEG Xi'an Research Institute （Group） Co.，Ltd.，Xi'an 710077，China）
Abstract：To address the problems of existing hydraulic intensifiers used in underground coal mines—such aslarge size，inabilitytoachieve pressure boostingwhiledrilling，and theneed for auxiliarydriving devices-a passive hydraulic intensifier forwhile-drillingoperations was developed basedon the piston diferential presurization principle，employing a multi-stage multi-chamber modular design and acoordinated control techniqueusing directional valves.This intensifier did not rely onan external high-pressure pump and converted low-pressure underground mine water into high-pressre water autonomously，enabling high-pressure permeability-enhancement operations. It achieved a pressurization ratio of 1：10 with a minimum pressurization pressure of 20MPa .The influences of high-pressure outlet diameter， effective piston acting area ratio，and input pressureon the performance of the intensifier were analyzed：the larger the high-presure outlet diameter， effective pistonacting area ratio，and input pressure，the fasterthe flowvelocityof the high-pressure liquid，but thelonger the timerequired forthe high-pressure liquid toreachasteady-statevelocity.Field industrial testresults showedthat，during hydraulic punching and cavitycreation inasoft coalseamwitha firmness coefficientof 0.15， the average coal output per meter of borehole reached 1.5t/m ，and the intensifier exhibited stable performance， achieving pump-free high-pressure hydraulic permeability enhancement.
Key words： pressure-relief permeability enhancement; passive hydraulic intensifier for while-drilling operations; piston differential pressurization; hydraulic punching; coordinated control using directional valves
0引言
我国大部分煤矿煤层透气性低，在煤矿井下抽采瓦斯时，需要对煤层进行卸压增透来提高瓦斯抽采效率[1-2]。（剩余11018字）
