水力压裂技术在白皎煤矿穿层条带瓦斯治理中的应用
2018-07-13陈兴燚张尚斌饶孜余正敖
陈兴燚 张尚斌 饶孜 余正敖



摘 要:为提高白皎煤矿井下瓦斯抽采效果,在白胶煤矿238底板道进行了穿层条带水力压裂技术应用,对B4煤层进行水力压裂增透。压裂最大压力达24.6MPa,单孔最大注入液量113.8m3,抽采纯量提高了2.27倍,在抽采时间不变的情况下,钻孔数量可减少56%。结果表明,达到了压裂设计方案要求,增透卸压效果显著,水力压裂在白皎煤矿是适用的,下一步要进行大面积推广实施,以充分发挥水力压裂技术的效果。
关键词:水力压裂技术;瓦斯治理;抽采量
中图分类号:TD712.6 文献标识码:A 文章编号:1003-5168(2018)16-0073-04
Application of Hydraulic Fracturing Technology in Gas Control of
Wearing Layer in Bai Jiao Coal Mine
CHEN Xingyi1 ZHANG Shangbin1 RAO Zi2 YU Zheng'ao1
Abstract: In order to improve the gas extraction effect in the coal mine of Bai Jiao coal mine, the hydraulic fracturing technology was applied in the 238 floor road of Bai Jiao coal mine, and the hydraulic fracturing of B4 coal seam was enhanced. The maximum pressure of the fracturing was 24.6MPa, the maximum injection liquid of the single hole was 113.8m3, the extraction purity was increased by 2.27 times. The number of drilling holes could be reduced by 56% when the extraction time was constant. The result showed that the fracturing design plan was required and the effect of increasing and unloading pressure was remarkable. Hydraulic fracturing was applicable in white Jiao coal mine. The next step was to carry out large area in order to give full play to the effect of hydraulic fracturing technology.
Keywords: hydraulic fracturing technology;gas control;extraction volume
1 研究背景
1970—1980年,辽宁、河南、湖南和山西等矿务局进行了以地面垂直钻进压裂方式开发煤层气的试验,取得了一定的增产效果,但未能形成开发、推广规模。1990—1995年,地矿、煤炭和石油所属有关部门及地方政府已在十余个煤田或地区,利用国内资金或与国外合资打了60多口资源评价钻孔和生产试验钻孔,有的地方还进行了采气试验,取得了可喜的成果。20世纪90年代末,鄂尔多斯、沁水等9个盆地煤层瓦斯赋存条件较好,已逐渐开始全面实施地面开采。2004年,山西沁心和河东煤田已施工各类煤层气井159口,单井日产气量一般在500~4 000m3/d,最高达16 000m3/d[1]。
近年来,水力压裂技术被广泛应用于煤矿井下煤层增透,有效提高了瓦斯治理效果[2-5]。为了得出水力压裂在白皎煤矿的适用性,计划在白皎煤矿238底板道施工3个压裂钻孔,同时在压裂区域内与非压裂区域内分别施工部分瓦斯抽采钻孔,将二者的抽采情况进行对比,经综合分析得出水力压裂增透技术在该矿的适用性。……
