CALCULATION OF THE STRENGTH OF CASING COLUMNS

For strengthening the walls of the well with the casing its mechanical properties and rheological parameters of the rocks should be considered. Radius of excited, viscous-elastic rocks and influence of internal friction angle on the strength of the casing have been analyzed in the article. Considering rheological properties of rocks expressions of normal and tangential stresses influencing lateral surface of casing string have been obtained. It has been determined that by increase of the radius of the excited zone of rocks and internal friction angle the flowing limit of the material of casing string increases too. As a result of carried out calculations the table has been compiled and corresponding graphics have been constructed.