Application of directional circulation drilling and air-lift reverse circulation borehole cleaning

The construction process principles, parameters and control of construction technology of directional circulation drilling and air-lift reverse circulation borehole cleaning are described. Through the combination of two kinds of construction technologies, it can effectively solve the pile bore hole wall stability problems, prevent the hole wall collapse, reduce the thickness of clay skin, significantly shorten the time to clean the hole, reduce the hole bottom sediment thickness, improve the bearing capacity and reduce emissions of mud. From the construction period, quality, economy and environmental protection perspective, the directional circulation drilling and air-lift reverse circulation borehole cleaning has obvious advantages, certain promotion and application value.