DEVICE AND TECHNOLOGY OF CONTINUOUS WELL FLUSHING

Link for citation: Tretyak A.Ya., Litkevich Yu.F., Kruglova T.N. Device and technology of continuous well flushing. Bulletin the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 5, рр.181-188. In Rus. The relevance research is due to fact that at present a large number accidents occur stoppage rotation drill string cessation flushing during build-up string. Staying wellbore some time rest, then creating fluid pressure pulses accompanying start stop mud pumps, can lead undesirable phenomena complications in form sticking. Sticking be mechanical, complex geometry wellbore, falls into rocks from walls well, formation cuttings bottom insufficient well. percentage such reach 20. Up 80 % differential sticking difference – hydrostatic, formed density drilling fluid, reservoir, formation. Due these processes, water infiltration occurs, thick polymer clay cake on walls, which contributes sticking, is, walls. purpose: develop device wells when building tool. Objects: Methods. A consisting synchronously overlapping on-off valves provide up tool proposed manufacturing. mobile crane switching synchronizer described, its design principle operation are given. Technological methods realize possibility operation. Results. solution task set made it possible wells.