›› 2009, Vol. 30 ›› Issue (S1): 231-234.

• Numerical Analysis • Previous Articles     Next Articles

Study of casing deformation in halite bed under earthquake

WU Kai-song1, LUO Jin-jun1, ZHANG Qing-sheng2, RONG Ming1   

  1. 1. Southwest Petroleum University, Chengdu 610500, China; 2. Puguang Branch, Zhongyuan Petroleum Company, Dazhou 635000, China
  • Received:2009-04-20 Online:2009-08-10 Published:2011-03-16

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Abstract:

Casing deformation and damage have been found in halite beds in many gas wells of a gas field after 5.12 Wenchuan Earthquakes. It is very important to find out the reasons and laws of the casing deformation in order to control and repair them. Distribution laws of the casing stress and deformation are found out by applying true three-dimensional contact finite element analysis before the earthquake. Based on the above, applying extra different earthquake loads to top face of the model, the casing stress and deformation are studied again. Careful contrast of the two results shows that the level of casing stress and deformation is higher in halite bed than that in other beds whether before or after earthquakes; and the basic laws are that the higher earthquake power is, the higher level of casing stress and deformation is in halite bed. Finite element calculation results also reveal that 5.12 Wenchuan Earthquakes are the direct reasons for casing deformation and damage because the Mises stress of the casing in halite bed is already over the yield limit of its material only under the influence of vertical component load of 5.12 Wenchuan Earthquakes.

Key words: casing, deformation, earthquake, halite, finite element analysis

CLC Number: 

  • TE 31
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