caa a22 4500 606225684 CHVBK 20210128101149.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s10553-015-0557-1 doi (NATIONALLICENCE)springer-10.1007/s10553-015-0557-1 Application of a Special Technique for Controlling the Cutting Bed Height in Gas Drilling of Horizontal Wells [Elektronische Daten] [Yang Xiaoguang, Liu Gonghui, Li Jun] Sedimentation of cuttings limits application of gas drilling through a horizontal well section. We have constructed a theoretical model of two-layer flow as applied to flow of the gas and solid particles; we have developed a diffusion theory for gas drilling conditions for horizontal well sections. The calculations are performed using data from real wells. The calculations show that when drilling a horizontal section, a cutting bed will inevitably be formed and we need to control sedimentation of the cuttings by regulating the gas flow velocity. For low gas velocities, the resistance of the particles to motion is mainly created as a result of their collisions with the well wall in the cutting bed zone. For high gas flow velocities, the major resistance is created as a result of collisions of the particles with the well wall in the two-layer flow zone. Based on previous studies of two-layer flow and the cutting bed, it was established that gas injection should be done at the bottom of the well when gas drilling a horizontal section. The ascending gas flow velocity should be 1.5 times higher than the particle sedimentation rate. Only under such conditions is control of cutting bed formation possible. Springer Science+Business Media New York, 2015 cutting bed nationallicence gas drilling of horizontal wells nationallicence two-layer flow nationallicence Xiaoguang Yang College of Petroleum Engineering, China University of Petroleum, Beijing, China aut Gonghui Liu College of Petroleum Engineering, China University of Petroleum, Beijing, China aut Jun Li College of Petroleum Engineering, China University of Petroleum, Beijing, China aut Chemistry and Technology of Fuels and Oils Springer US; http://www.springer-ny.com 50/6(2015-01-01), 508-515 0009-3092 50:6<508 2015 50 10553 https://doi.org/10.1007/s10553-015-0557-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10553-015-0557-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Xiaoguang Yang College of Petroleum Engineering, China University of Petroleum, Beijing, China aut NATIONALLICENCE 700 1- Gonghui Liu College of Petroleum Engineering, China University of Petroleum, Beijing, China aut NATIONALLICENCE 700 1- Jun Li College of Petroleum Engineering, China University of Petroleum, Beijing, China aut NATIONALLICENCE 773 0- Chemistry and Technology of Fuels and Oils Springer US; http://www.springer-ny.com 50/6(2015-01-01), 508-515 0009-3092 50:6<508 2015 50 10553