Production-Induced Casing Damage Analysis In Overburden And Unconsolidated Reservoir

This research,documents a study about the Production-Induced Casing damage analysis in overburden and unconsolidated reservoir.The study display an interaction between reservoir and downhole equipments(i.e.casing)based on the reservoir geomechanics concept.This is because of the fact that,well problems associated with production are strongly linked to the geomechanical response of the reservoirs,in oil/gas field.Thus the topic become significantly important so as to control the strength of reservoir rocks.The vise versa will lead to loss of pressure integrity and pinching on the production tubing,hence inability to lower workover tools and in some cases production wells seem to be converted to injection wells.Higher Stress changes in reservoir and overburden zones impose deformation to the casings.Thus in this research,plastic deformation occurred and analyzed clearly on changing the values of stresses applied to the rock in the FE models.Numerical simulation models was done through ANSYS15.0 but mainly with ABAQUS6.14-4.The models in this research included three different types of the materials;(1)Formation(3)cements sheath and(3)Casing,although,focusing areas were only rock and casings.During the study,Casing problem existed as a results of the loading subjected reservoir rocks passing through progressive deformation as in-situ stresses exceed the strength limit of the materials.The results obtained after modeling indicated elastic and plastic flexures due to high variation of stresses applied in the model to exceed the strength limit of analyzed materials.This implied that optimal stresses during production activities should be maintained and controlled throughout the project.