DEVICE AND TECHNOLOGY OF CONTINUOUS WELL FLUSHING

The relevance of the research is caused by the fact that at present a large number of accidents occur due to the stoppage of the rotation of the drill string and the cessation of flushing during the build-up of the drilstring. Staying the wellbore for some time at rest, and then creating flush-ing fluid pressure pulses accompanying the start and stop of mud pumps, can lead to undesirable phenomena and complications in the form of sticking. Sticking can be mechanical, due to the complex geometry of the welbore, fals into the rocks from the walls of the wel, the formation of cuttings at the bottom of the well due to insufficient flushing of the wel. The percentage of such accidents can reach 20. Up to 80 % of differ-ential sticking is due to the pressure difference - hydrostatic, formed in the wellbore due to the density of the driling fluid, and reservoir, formed in the welformation. Due to these processes, water infiltration from the driling fluid into the formation occurs, and a thick polymer clay cake is formed on the well wals, which contributes to the formation of differential sticking, that is, the sticking of the drilstring to the welwalls. Purpose: to develop a device and technology for continuous flushing of wells when building a drilling tool. Objects: device and technology for continuous well flushing. Methods. A device for continuous flushing of the well, consisting of synchronously overlapping on-off valves that provide continuous flush-ing of the well when building up the drilling tool is proposed for manufacturing. A mobile crane switching synchronizer is described, its de-sign and principle of operation are given. Technological methods are proposed that realize the possibility of the device operation. Results. The solution of the task set made it possible to develop the design of the device and the technology of continuous flushing of wells.