title: Numerical simulation on open wellbore shrinkage and casing equivalent stress in bedded salt rock stratum.
abstract: Most salt rock has interbed of mudstone in China. Owing to the enormous difference of mechanical properties between the mudstone interbed and salt rock, the stress-strain and creep behaviors of salt rock are significantly influenced by neighboring mudstone interbed. In order to identify the rules of wellbore shrinkage and casings equivalent stress in bedded salt rock stratum, three-dimensional finite difference models were established. The effects of thickness and elasticity modulus of mudstone interbed on the open wellbore shrinkage and equivalent stress of casing after cementing operation were studied, respectively. The results indicate that the shrinkage of open wellbore and equivalent stress of casings decreases with the increase of mudstone interbed thickness. The increasing of elasticity modulus will reduce the shrinkage of open wellbore and casing equivalent stress. Research results can provide the scientific basis for the design of mud density and casing strength.
authors.affiliation: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, China ; School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu, China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Liu
authors.forename: Linzhi
authors.initials: L
authors.lastname: Zhang
authors.forename: Jinzhou
authors.initials: J
authors.lastname: Zhao
mesh_terms: D003198:Computer Simulation; D055119:Elastic Modulus; D006244:Hardness; D008422:Materials Testing; D008956:Models, Chemical; D012492:Salts / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D013314:Stress, Mechanical; D060986:Water Wells / Q000737:chemistry*
chemical_list: D012492:Salts; D012987:Soil