The Research On Deep Water Drilling Kick Tolerance And Casing Depth Calculation

With the gradual exhaustion of land-based oil and gas resources,as well as the increasing difficulty in exploration and development,deep-water areas have gradually become the main alternative areas for the world’s oil and natural gas resources.However,the depth and low temperature challenges faced by deepwater drilling have certain limitations in the wellbore structure design method in which the wellhead margin is applied to the pressure constraint criterion with a single constant value,and it cannot guarantee the safe and efficient operation of deepwater drilling operations.Based on the law of conservation of energy and the theory of thermodynamics,this paper deduces the prediction model of circulation temperature field in deepwater drilling process,and simulates and analyzes the distribution law of wellbore temperature field during circulation by C#.NET language programming.By establishing the wellbore pressure calculation model during the deep water drilling gas invasion and shut-in and well killing,the variation rules of air inflow and well pressure are analyzed,and the maximum allowable shut-in pressure limit conditions are improved to improve the well volume.Surplus margin calculation method.In view of the deficiency in the application of well surplus in the existing pressure confinement criterion design method,based on the conventional design method of deep casing depth design,the influence of volumetric well allowance on the depth of the casing is analyzed,and the existing design is improved.Methods,and verified by examples.In this paper,the wellbore temperature field during circulation and the gas-liquid two-phase flow during shut-in and killing are taken into account in the establishment of the well headroom calculation model,and the conditions for obtaining the maximum shut-in pressure are increased,and the well-surge established The quantitative calculation model improves the existing method for determining the depth and depth of casing entry,and has a theoretical guiding effect on the actual drilling engineering design.