大溶隙岩溶地层的有效钻孔堵漏方法

The Effective Leaking Stoppage for Great Crack in Karst Stratum

摘要:

复杂地层钻探问题一直是地质勘探、工程勘察及工程施工钻进中的主要技术难题。分析了复杂地层钻探护壁堵漏的方法；结合宁夏六盘山区东北麓芒硝矿钻探工程，对于大溶隙岩溶地层钻探，提出采用水泥-水玻璃-布袋护壁堵漏方法。阐述了漏失通道的性质和位置的分析方法、护壁堵漏方案和原理、正确确定注浆压力及最大注浆量的方法。

Abstract:

Drilling in complicated stratum is always the most difficult technical problem in the mineral resources exploration as well as the project reconnaissance and construction. This article analyzes the method of hole wail protection and leaking stoppage for drilling in complicated stratum; and with the case of drilling project of glauber salt mine in the foot of Liupanshan Mountain in Ningxia, proposes to use cement-sodium silicate-cloth sack in great crack in Karst Stratum. The nature of the dropout channel and the analysis method of leaking position, the principle of hole wail protection and leaking stoppage, and the correct method to determine grouting pressure and maximum grouting amount are elaborated. This method has been proved extremely effective with good economic efficiency.