基于多分支水平钻井注浆工艺的薄层灰岩水防治效果研究

Study on Water Control Effect of Thin Limestone Based on Multi-branch Horizontal Drilling Grouting Technology

为防止太原组薄层石灰岩含水层下部煤层在开采过程中发生突水,黄河北部西南地区煤矿采掘前应用多分支水平定向钻井技术,对平均厚度为10 m的含水层进行注浆加固,将含水层改造为弱含水层或隔水层。为探究注浆浆液影响范围及改造效果,通过统计钻孔水位分布进行分析。多分支水平井注浆工艺能形成明显的阻水隔水区域,对太原组薄层石灰岩含水层改造效果明显,钻井布置越密集则改造效果越优。本次实践为薄层石灰岩含水层加固治理提供了经验和技术支撑。

In order to prevent water inrush from the lower coal seam of the thin limestone aquifer of Taiyuan Formation during mining,the multi-branch horizontal directional drilling technology was applied before mining in the southwestern part of the northern Yellow River.The aquifer with an average thickness of 10 m was reinforced by grouting,and the aquifer was transformed into a weak aquifer or aquiclude.In order to explore the influence range and transformation effect of grouting slurry,the distribution of borehole water level was analyzed by statistics.The grouting process of multi-branch horizontal wells can form obvious water-blocking and water-resisting areas,and the effect of reconstruction of thin limestone aquifer in Taiyuan Formation is obvious.The denser the drilling arrangement is,the better the reconstruction effect is.This practice provides experience and technical support for the reinforcement and treatment of thin limestone aquifer.