The paper has discussed the effect to well water quantity using flushing fluid and different kinds of well drilling,it has studied the advanced and shortcoming of chemical fluid and piston washing well.

And the calculation methods of sinking coefficient,minimum flow of flushing fluid and minimum sinking depth,which affect hole cleaning effect,are put forward to guide construction effectively.

The infection of the washing liquid used in the pump at the decompression tower bottom to the medium was introduced.

This paper sums up the features of the coalfield's comprehensive coal-rock stratum and boring construction techniques,and analyzes the washing fluid technique and drill guarding method adopted in the boring on comprehensive coal-rock.

Selecting the proper washing fluid can reduce the volume of the washing fluid for the sterility test of imipenem/Cilastatin injection.

It is introduced the status quo of domestic flush fluids, and is described a kind of DF flush fluid, which is developed according to the problems of poor compatibility between the cement slurry and the drilling fluid and the great i.