纳岭沟铀矿床地浸工艺孔高效快速施工工艺研究

Research on the efficient and rapid construction technology of in-situ leaching wells for the Nalinggou uranium deposit

摘要:

纳岭沟铀矿床地浸工艺孔（一次成孔）偏斜要求高、施工工序多，导致钻孔施工难度大、周期长，全工序施工周期6~10 d，平均7~8 d，裸眼施工时间4~8 d，平均5~6 d。为了高效快速施工地浸工艺孔，节约全流程钻进时间，本文从优化钻具级配、泥浆配方，优选螺杆钻具和扶正器，使用随钻测斜仪，设计固控系统、下管辅助设备，采用坐封器防止泥浆回落等多方面进行高效快速施工工艺研究，通过试验研究，实现了裸眼成孔时间短、成孔质量高、钻具损伤小和钻头消耗少的应用效果。

Abstract:

The deviation requirements for the in-situ leaching process holes in the Nalinggou uranium deposit are high， and there are many construction procedures， which make the drilling construction difficult and the construction period long. The construction period for the entire process of the in-situ leaching process holes （one-time hole formation） in the Nalinggou uranium deposit is 6 to 10 days， with an average of 7 to 8 days. The open-hole construction time is 4 to 8 days， with an average of 5 to 6 days. In order to efficiently and rapidly construct the in-situ leaching process holes and save the entire drilling process time， this paper conducts research on the efficient and rapid construction process from aspects such as drilling tools gradation， mud formulation， positive displacement motors and centralizers. Introduce drilling inclinometers， design of solid control systems， design of pipe lowering auxiliary equipments， and design of setting devices to prevent mud from falling back. Through research and experiments， the effects of short open-hole formation time， high hole formation quality， small damage to the drilling tool and low consumption of the drill bit have been achieved.