The practical testing indicates that the system has an evident electricity-saving effect while ensuring a safe undergroundoperation.
实际测试表明，在给井下安全作业带来了可靠保证的同时，节电效果明显。
2
The phenomenon of reservoir permeability decrease caused by drilling, completion and other undergroundoperation is known as formation damage.
在钻井、完井等井下作业过程中，造成油气层渗透率下降的现象通称为油气层损害。
3
Xinpu Phosphate Mine, medium and small-sized, features Complicated hydrogeological conditions and Marine sludge and heaving sand menacing undergroundoperation.