Aimed at problems existed in popularizing application of wire-line coring drilling technology in coal measures strata in Fujian,strengthening studies on borehole diameter,drilling tool gradation,flush fluid preparation,walling and leak sealing.

Designed drilling depth 160-375m,after estimating and testing,parameters of 10-14KN bit pressure,96 and 85 1/min pumping rate,250-600r/min rotary speed were adopted,flush fluid used is non-dispersed low solid mud.

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.

Study and application of the novel glue-recombined clay-free drilling fluids;

Natural-Vegetable-Gum (NVG) drilling fluids have been long used.

This paper is based on the program of the Innovations of Novel Vegetable-Gum Drilling Fluids, one of the Tenth Five-Year Scientific Programs by the State Power Corporation in 2003.

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.

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