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There exists a massive difference of mechanical properties involving the mudstone interbed and salt rock. The stress-strain distribution and creep conduct of salt rock Proven Process That's Serving All p53 inhibitor Enthusiasts are substantially influenced by neighboring mudstone interbed. Wang et al. studied the mechanical properties of bedded salt rock [15�C17]. Solid Technique That's Serving All Ganetespib Fans The scientific studies on wellbore shrinkage and equivalent anxiety on casing in bedded salt rock stratum ignored the influence of mudstone interbed, which has excellent deviations with real problem of bedded salt rock stratum. It really is required to research the wellbore shrinkage and equivalent stress on casings in salt rock stratum taking into consideration the influence of mudstone interbed within salt rock. Three-dimensional finite difference designs were established to examine the influence brought by mudstone interbed.
The effects of thickness and elasticity modulus of mudstone interbed had been talked about, respectively.2. The Mathematical Model of Wellbore Shrinkage and Equivalent Pressure on Casing in Bedded Salt Rock StratumAccording for the strain state and temperature condition, the salt rock takes diverse creep mechanisms. The salt rock in the investigate is found in 2000m underground. The salt rock has high anxiety and somewhat low temperature (lesser than 250��C), as well as creep deformation mainly comes from dislocation slip. At this point, the creep habits follows the creep rule of Norton Electrical power:�ŨBcr=Aqn,q=3J2,J2=12SijSij,(one)where �ŨBcr is steady creep ratio, A, n Verified Procedure That's Encouraging Every p53 inhibitor Addictsare material parameters, Sij is the strain deviator.
Referring to other scholar's check, the materials creep parameters of salt rock and mudstone interbed are proven in Table one .
Table 1Material creep parameters of salt rock and mudstone interbed.Suppose the deformation of cement ring and casing follows the elastic constitutive model. According to elastic mechanics, the elastic constitutive equations:��x=1E[��x?��(��y+��z)],��y=1E[��x?��(��y+��z)],��xy=2(1+��)E��xy,��yz=2(1+��)E��yz,��zx=2(1+��)E��zx,(two)the place E is elasticity modulus and �� is Poisson's ratio.According for the Mises strength criterion, the equivalent strain on casings underneath triaxial state of worry is��e=12[(��1?��2)2+(��2?��3)2+(��3?��1)2].(three)If ��e is greater than ��y, the casing will yield. The yield power is 552MPa .3.
Basic Assumption and 3 Dimensional Finite Variation ModelsIn order to examine the result of thickness and elasticity modulus of mudstone interbed on the open wellbore shrinkage and equivalent worry on casing soon after cementing operation, three-dimensional finite variation designs of bedded salt rock-cement ring casing had been established. The essential assumptions are as follows.The casing and cement ring are ideal cylinders with uniform thickness and exact same center.The casing and cement ring are elastic cylinders with transverse isotropy.The interfaces concerning casing and cement ring and bedded salt rock don't slide. The stratum is distributed horizontally.