pack gravel造句

• Designning well tube and drill - hole diameter in order to increase thickness of both annular packing gravel and water - resisting clay , nylon net packing around well tube filters , designing filter layer on the boundary between packing gravel and water - resisting clay and ramming the gravel by working the piston into the well after gravel packing completion and the filling clay for salt - water resisting etc . we succeeded in constructing 3 drinking - water wells in minqin county , proved the affectivity and feasibility of using it and giving a certain technical demonstration of construction of drinking - water well in the same similar to this area
  通过孔径与管径的调配设计，增大环状粒料层和止水粘土层的厚度；滤水管外包尼龙纱网；粒料与止水粘土接触界面上设计反滤层；填粒后先行拉活塞利用水力夯实粒料层，再投粘土球止掉上部咸水等措施，在民勤县三口人饮水井施工中取得显著效果，证明了该套成井工艺的有效性和可行性，有望为同类地区人饮水井施工提供技术示范作用。