煤层气短水平段径向钻井压裂技术及应用

发布时间：2018-07-25 14:46

【摘要】：为了有效避免煤储层垮塌,减小对煤储层污染程度,提高煤层气短水平段径向钻井压裂技术开发效果。在沁水盆地北部七元矿区块应用短水平段径向分支钻井技术,该径向钻井压裂技术将煤层分为n个施工层位,每个施工层位均钻进4个短水平段径向分支,同一施工层位相邻径向分支的方位角相差π/2,相邻施工层位对应径向分支的方位角相差π/(2n),水平段径向分支长度约为100 m,钻进过程中采用清水高压喷射的方式钻进,钻进结束后对各个施工层位的径向分支进行整体合压。结果表明,该技术能使煤层气井见气时间缩短、产气量较高,并能有效沟通煤层天然裂隙,增大煤层泄气面积,降低煤储层污染程度,避免煤储层垮塌,可为煤层气开发提供一条新的有效增产途径。
[Abstract]:In order to effectively avoid coal reservoir collapse, reduce the degree of pollution to coal reservoir, and improve the development effect of radial drilling fracturing technology in short horizontal section of coalbed methane. The short horizontal radial branch drilling technique is applied in Qiyuan mining area of northern Qinshui Basin. This radial drilling and fracturing technology divides the coal seam into n construction layers, each of which is drilled into 4 short horizontal radial branches. The azimuth difference of the adjacent radial branch of the same construction layer is 蟺 / 2, the azimuth of the adjacent construction layer is 蟺 / (2n) corresponding to the radial branch, and the radial branch length of the horizontal section is about 100 m. At the end of drilling, the radial branches of each construction layer are compacted as a whole. The results show that the technology can shorten the time of coalbed gas formation, increase the gas production, effectively communicate the natural fracture of coal seam, increase the area of coal bed gas leakage, reduce the pollution degree of coal reservoir, and avoid coal reservoir collapse. It can provide a new and effective way to increase production for coalbed methane development.
【作者单位】：中联煤层气有限责任公司;中联煤层气有限责任公司七元煤矿瓦斯治理与煤层气开发合作项目组;
【基金】：国家科技重大专项资助项目(2011ZX05042-001)
【分类号】：TE243;TE377

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