The technique of blast in well combined with gush flushing well by liquid carbon dioxide was studied in karst crack section of well, so as to increage well yield.

Discusses Shallowly the Change Management of Well Flushingin HSE Management System's

Measures to improve perrne- ability reduction are discussed in terms of the drilling method,fluid properties,artificial infiltration layer,and well flushing,etc.

Reasonable drilling technique is selected, advanced well flushing methods are proposed and the job is finished with highquality on time.

The effect of well cleanout sewage upon soil quality and crops;

This paper introduces a technology which is specially used for removing the plug of well bore or near well bore generally existed in low permeability fields, that is, the matching technology of well cleanout and plug removal with low density foam under negative pressure.

Application of well washing technology without pressure release in high pressure water injection well;

Piston,mixer and pumping were adopted to try to determine proper steps for well washing.

The presently adopted physico-chemical method of well washing uses empirical estimate for the number of bottles of carbon dioxide used in the implementation of well spurt.

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.

In order to solve this problem, the Gas Lift method is brought according to the relation between bottom hole differential pressure and the efficency of well cleanup.