In view of drill leak,hole wall collapse and long-time leaking stoppage during drilling for leaching in-situ sandstone style uranium deposits in the Yindong district of Eerduosi basin and Bayin Gobi district of Bayin Gebi basin,Inner Mongolia,recyclable foam mud was tested.

It is specially used to compound foam fluid and foam mud in versatile air drillings.

Bore-hole pressure calculation formula is discussed,bore -hole pressure drop factor is defined Press-sure,pressure drop factor and foam mud density are calculated at different depths in the given condition;a curve is drawn ;maximum pressure drop facto applicable depth are determinded.

In order to overcome the random of the foam diameter in the foam mud thick liquid and to improve the stability of the foam mud thick liquid, the turbine foam scattring cutting machine is designed.

Thus, chemical gas release foamed cement slurry system.

In order to solve the problems, a novel foam cement slurry system with low density, high strength and good channeling resistance, has been developed and tested.

Through laboratory tests,high quality formula of C12 foam mud was optimized,which made the drilling construction successful in serious fracture leakage formation.

Dynamic density of circulative foam drilling fluid measurement;