Gidzhuk Y. Forecasting of durability of members of a drill string at a percussive offloading

The dissertation is devoted a solution of a problem of increase of use reliability of a drill column by check of level of its chattering and forecasting of durability of members of arrangement of a bottom-hole assembly which one works in the condi-tions of an intensive percussive offloading. Allowing for a tendency of progressing of modern systems vibrating diagnostics the recording system is improved, treating and the analysis of percussive performances of a drill column and is adapted it for operation in industrial conditions. The mathematical model of definition of a stressed state in members of a drill column which one work in the conditions of a percussive offloading is improved. The simulation model which one allows for influencing latch screwed joints on a dynamic state of a drill column depending on a mode of its offloading is elaborated. Dependences limiting сhattering velocity members of a drill column from a construction of bore well, a drilling string assembly and a drilling practices according to which one paths rationing are tendered chattering are erected. The method of forecasting of durability latch screwed joints of arrangement of a bottom-hole assembly in bore well drilling-time that has given the chance to value level of their percussive offloading and durability is tendered. Industrial check of the tendered method it is carried out on bore well Makunivskaja-15 Stryjsky department of drillings, by which one results elaborated "the Method of application of forecasting of durability of members of a drill column in the conditions of a percussive offloading".