洗井技术原理研究及其在超深水文孔中的联合应用

Research on mud flush technology and its combined application in ultra deep hydrological observation hole

焦作马厂煤详查区水文钻孔抽水层位深度1 060～1 290 m,单一洗井方法不能满足超深水文钻孔充分可靠的洗井要求。深入了解每种洗井方法的特性,组合利用才能达到较好的洗井效果。针对不同含水层采用不同的洗井方法组合:砂岩裂隙含水层采用焦磷酸钠浸泡+高压射流+抽水洗井+CO2洗井;灰岩岩溶裂隙含水层采用焦磷酸钠浸泡+高压射流+抽水洗井+盐酸+CO_2洗井,并严格按照联合洗井试验顺序。经联合洗井后,钻孔涌水量增加20%～200%,收到良好的洗井效果。

The depth of hydrological drilling of the Jiaozuo Machang coal detailed investigation area was 1 060-1 290 m.The single well washing method could not meet the requirements of fully reliable well washing for ultra-deep hydrological drilling.In-depth understanding of the characteristics of each well washing method,combined use could achieve better washing results.Different washing methods were used for different aquifers：sandstone fissure aquifer was treated with sodium pyrophosphate soak＋high pressure jet＋pumping well＋CO 2 well;limestone karst fissure aquifer was soaked with sodium pyrophosphate＋high pressure jet＋pumping well＋hydrochloric acid＋CO 2 to wash the well,and strictly follow the joint washing test sequence.After combined washing,the water inflow from the borehole increased by 20% to 200%,and a good well washing effect was obtained.