The Casing Damage Mechanism And Preventive Measures Of XinLi Oilfield

The XinLi oil field has now confirmed that made casing well number to total wellabove40%total, casing well control geological reserves of30.548million tons. Oil wellcasing damage makes development Wells are imperfect, the oil well casing lost productioncapacity, lead to oil field development in the implementation of programmes and yield ofserious restriction, the impact of the oil field development benefits. Therefore, carry out thecasing damage mechanism and preventive measures, to curb the development trend of thecasing, maintain stable oil field is important.This article through the casing damage form, the influence of the casing geological,development, engineering factor analysis, will be divided into that of casing damage typecasing shrink diameter, casing shear and sleeve burst three categories. Casing shrink diameteris casing in radial stress extrusion under the action of the happened; Shear deformation andbad break is between the relative sliding produce formation; Rupture is due to corrosion orother causes of mechanics. The new set of oil field casing shear form the Lord; The new set ofeach layer oilfield ground stress distribution to see, set of loss point is mainly distributed inthe in-situ stress change the fastest. Water injection pressure, the comprehensive water cut andthe pressure difference between blocks of casing damage is caused by the main developmentfactors.According to different types of casing damage, think in pressure adjustment, making thepressure difference between block is less than4MPa; If the pressure difference between blockover4MPa, reduce the existing water injection pressure. In addition, still need to open theoptimization perforation parameters, reduce the casing strength loss, easy to set of cuttingposition of casing damage to strengthen protection method to curb the development trend ofthe casing.