Analysis of the stress field of casing-cement sheath cementation surface considering the influence of cementation surface pore
Considering the mechanical properties of casing-cement sheath cementation surface and the influence of pore structure shape of cement surface,the mechanical model of casing-cement surface-cement sheath-formation combination is established based on the theory of elasticity,and with the help of finite element analysis method,the influence coefficients of pore number and pore structure shape of casing-cement sheath cement surface on the stress field are established.The expression of the stress field of casing-cement sheath cementation surface considering the effect of cementing surface clearance is obtained.The results show that when the pores exist,the Mises equivalent stress increases by 12.50%,the radial stress increases by 9.30%and the circumferential stress increases by 8.65%.The pore number and pore structure shape of the casing-cement sheath cementation interface will aggravate the non-uniformity of the stress field,and the pore number has a greater influence on the stress field,with the maximum influence coefficient being 1.1524.The research results have cer-tain engineering value to the safety evaluation of wellbore system.
casing-cement sheath cementation surfacemechanical modelporosityinfluence coefficientstress field
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