CAJ | 학술논문

针对我国煤层气抽采率低的现状，首次提出在现有钻孔水压致裂的基础上，施以高压脉冲放电，以增加煤层水压致裂过程中裂隙的通透性；借助自主研发的高压脉冲水中放电实验装置，研究了脉冲放电水激波波前时间 t及其斜率K 随放电电压U及静水压力p0的变化规律，并结合相关的数据采集与分析系统进行了不同放电参数下的实验研究。通过建立水激波波前时间的理论计算模型，并对其进行求解，获得了 t及K 关于U和p 0的二元函数关系式 t＝ F（U ，p0）及 K＝ G （U ，p0）。实验结果与理论计算均表明：当 p0一定时，t随U的增大而减小，而 K 随U的增大而增大，即水压一定时，电压越高，水激波波前时间越短，峰值压力上升速度越快；当U 一定时，t随 p0的增大而增大，而 K 随 p0的增大而减小，即放电电压一定时，水压越高，水激波波前时间越长，峰值压力上升速度越慢。该研究为煤层高压电脉冲水压致裂提供了理论依据。
침대아국매층기추채솔저적현상，수차제출재현유찬공수압치렬적기출상，시이고압맥충방전，이증가매층수압치렬과정중렬극적통투성；차조자주연발적고압맥충수중방전실험장치，연구료맥충방전수격파파전시간 t급기사솔K 수방전전압U급정수압력p0적변화규률，병결합상관적수거채집여분석계통진행료불동방전삼수하적실험연구。통과건립수격파파전시간적이론계산모형，병대기진행구해，획득료 t급K 관우U화p 0적이원함수관계식 t＝ F（U ，p0）급 K＝ G （U ，p0）。실험결과여이론계산균표명：당 p0일정시，t수U적증대이감소，이 K 수U적증대이증대，즉수압일정시，전압월고，수격파파전시간월단，봉치압력상승속도월쾌；당U 일정시，t수 p0적증대이증대，이 K 수 p0적증대이감소，즉방전전압일정시，수압월고，수격파파전시간월장，봉치압력상승속도월만。해연구위매층고압전맥충수압치렬제공료이론의거。
In view of the present situation of low gas drainage and utilization ratio in China ,a new method which combines hydraulic fracturing and pulsed high‐voltage discharge was proposed to increase coal fracture .In order to explore how U(discharge voltage) and p0 (hydrostatic pres‐sure) affect t(front time) and K (slope) of water shock‐wave caused by hydro‐electric effect ,an experimental research of different discharge parameters under the help of test device of high volt‐age pulse and data acquisition & analysis system was implemented .Meanwhile ,binary functions t= F(U ,p0 ) and K= G(U ,p0 ) were established through the construction and solving of theoretical water shock‐wave model .The conclusions of both experiment and theoretical calculation reveal that ,when p0 is constant ,with the increases of U ,t decreases while K increases ,i .e .a higher dis‐charge voltage leads to a shorter water shock‐wave front time and a higher rising velocity of peak pressure .When U is constant ,with the increases of p0 ,t increases while K decreases ,i .e .a higher hydrostatic pressure leads to a longer water shock‐wave front time and a lower rising velocity of peak pressure .Therefore ,this research provides theoretical basis for high electric field pulse hy‐draulic fracturing in coal seam .