大管径定向钻进穿越扩孔泥浆技术参数探讨

Discussion of Mud Parameters for Reaming in Large Diameter Horizontal Directional Drilling Crossing

摘要:

对于D1219 mm大管径管道定向钻施工,在穿越包含粘土层、砂层、岩层等复杂地层时，需合理确定泥浆排量、扩孔器喷嘴数量等扩孔工艺参数。以举水河定向钻穿越工程为例，针对定向钻施工中泥浆排量不足、扩孔器选型不合理等问题，参考钻井工程中相关公式，验证了定向钻穿越中泥浆排量计算，补充了穿越施工规范中扩孔器喷嘴数量计算公式，并采用代尔夫特方程对定向钻施工中所需最大泥浆压力进行了计算，将计算成果应用到举水河定向钻施工中，为今后类似工程设计施工提供一定的参考。

Abstract:

In the directional drilling construction of D1219mm large diameter pipeline, the reaming process parameters should be reasonably determined while drilling through complex formations of clay, sand and rock, such as the mud displacement and the number of reamer nozzles. Taking an example of Jushui River HDD crossing engineering, according to the inadequate mud displacement and unreasonable reamer selection in directional drilling construction, the related drilling engineering formulas were referred to verify the mud displacement calculation in directional drilling crossing engineering and provide the calculation formula of reamer’s nozzle number for crossing construction specification. The required maximum mud pressure was calculated used Delft equation in directional drilling construction, the calculation results were applied in directional drilling construction in Jushui River, which a reference for future similar design and construction.