2015 EJRNL PP LE YU 1.pdf
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Terbatas Suharsiyah
» ITB
Terbatas Suharsiyah
» ITB
Cusp displacement catastrophe theory can be introduced to propose a new method about instability
failure of the interbed for gas storage cavern in bedded salt in solution mining. We can
calculate initial fracture drawing pace of this interbed to obtain 2D and 3D gas storage shapes at
this time. Moreover, Stability evaluation of strength reduction finite element method (FEM) based
on this catastrophe theory can used to evaluate this interbed stability after initial fracture. A specific
example is simulated to obtain the influence of the interbed depth, cavern internal pressure, and
cavern building time on stability safety factor (SSF). The results indicate: the value of SSF will be
lower with the increase of cavern building time in solution mining and the increase of interbed
depth and also this value remains a rise with the increase of cavern internal pressure Especially, we
can conclude that the second-fracture of the interbed may take place when this pressure is lower
than 6 MPa or after 6 days later of the interbed after initial fracture. According to above analysis,
some effective measures, namely elevating the tube up to the top of the interbed, or changing the
circulation of in-and-out lines, can be introduced to avoid the negative effects when the secondfracture
of the interbed may occur.