Due to the influence of its own parameters, conventional sand⁃washing tools can not meet the needs of the field. Based on the theoretical study of sand⁃washing mechanism, a complete set of sand⁃washing tools is designed. Through calculation, laboratory and field operation, it is proved that the non⁃metallic continuous pipe horizontal well sand⁃washing tool can solve the sand⁃washing problem of small displacement surface equipment in horizontal section, realize the functions of adjustable rotational speed, hydraulic propulsion, turbulent sand⁃carrying and pulsed jet, solve the technical problems of non⁃metallic pipe matching sand⁃washing tool, and obtain certain economic and social benefits.

The volatilization characteristics of ClO ₂ solution were investigated using a self-made laboratory bubbling reactor. The effects of temperature, bubbling flow and concentration of ClO ₂ solution on the volatilization rate of ClO ₂ solution were studied. The results show that ClO' ₂s volatilization is enhanced with increasing of ClO ₂ solution concentration, bubbling flow and temperature. However, when the mass concentration of ClO ₂ in solution is very low, the temperature has little effect on the evaporation rate. The relationship between volatilization and concentration of ClO ₂ solution is linear. Based on the experiments, the correlation model of the concentration of ClO ₂ solution attenuation with time is established: c=c ₀e ^-kt, the correlation of the volatilization rate coefficient of ClO ₂ solution is also obtained: k=2.152 5×10 ^-5θ+3.427 6×10 ^-4Q-7.599 7×10 ^-4. The model calculation is in good agreement with the experiment results, and can be used to calculate the volatilization rate of ClO ₂ solution in the bubble reactor.