煤矿超前探放水硬岩定向长钻孔精准高效施工技术

Precise and Efficient Construction Technology of Directional Long Drilling in Hard Rock for Advanced Water Exploration in Coal Mine

近水平定向钻进技术孔底空间参数采用BP神经网络实现了精准预测;通过极等间距网与笛卡尔坐标进行实钻轨迹成图,呈现实钻轨迹与设计轨迹随孔深的偏差分布和偏差量;采用加装水力振荡器和水力辅助加压器,通过改变振动形式、增加孔底辅助加压的形式,缓解孔底托压;通过定向长钻孔孔内局部注浆装置及配套机具和复合钻进技术,缩短辅助作业时间,形成了轨迹精准预测孔与评价、减阻辅助加压、复合钻进与局部注浆技术等硬岩定向钻精准高效探放水施工技术,并在新安煤矿底板奥灰水探测中进行了应用。应用实践表明,硬岩定向钻精准高效探放水施工技术能够满足硬质岩层高效探放水定向钻孔施工需求。

BP neural network prediction model was adopted to achieve accurate prediction of hole bottom spatial parameters.The actual drilling trajectory was mapped by polar equidistant network and Cartesian coordinates to show the deviation distribution and deviation amount of actual drilling trajectory and design trajectory with hole depth.The hydraulic oscillator and hydraulic auxiliary pressurizer were added to change the vibration form and increase the auxiliary pressurization form at the hole bottom to relieve the hole bottom pressure.The auxiliary operation time was shortened through the local grouting device in the directional long drilling hole,the supporting machines and tools and the composite drilling technology.The precise and efficient water exploration and drainage construction technologies for hard rock directional drilling,such as trajectory accurate prediction hole and evaluation,drag reduction assisted pressurization,composite drilling and local grouting technology,have been formed and applied in the Ordovician limestone water exploration of Xin’an coal mine floor.The application practice shows that the construction technology of precise and efficient directional drilling for water exploration and drainage in hard rock can meet the construction requirements of efficient directional drilling for water exploration and drainage in hard rock strata.