Abstract
During well testing, liquid pressures exerted on testing string change frequently. Actions of downhole tools rely on annular or tubing pressure operation; information collection of the reservoir needs the production control valve switch on and off repeatedly. Pressure variability makes it very difficult to predict testing string safety both in deformation and strength. Although many measures have been taken to forecast pressure and component of the reservoir, exceptions often occur, and one exception is abnormal pressure. Considering technological process, axial deformation, helical buckling and strength of testing string are calculated with abnormal high and low formation pressure. Influence of other parameters is discussed, including string structure, completion fluid density, cushion and downhole tool operation pressures.
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