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- W2374583885 abstract "Wellbore stability of drilling is a complex problem in the process of drilling.Affected by the natural fractures,shear failure may occur under lower bottom hole flowing pressure and gives rise to borehole collapse when the horizontal wellbore crosses natural fractures in the formations.Therefore,a set of principal stresses calculation formulas for the wellbore wall are deduced based on the theory of elastic mechanics and rock mechanics and in consideration of the influence of poroelasticity effect and thermoelastic effect of the rock.Regarding the natural fractures as weak planes in formations,the calculation formula for the angle between maximum principal stress on wellbore wall and normal direction of the natural fracture is obtained based on spatial position relationship between the principal stress and normal direction of the natural fractures.Then combining with shear failure criterion of weak plane structure,a mathematical solution model of the minimum bottom hole flowing pressure for maintaining wellbore stability is proposed,and model solution as well as acquisition method of flowing pressure of the wellbore stability is presented.Through formula deduction and case analysis,we know that dip and strike of the natural fractures,in situ stress and azimuth of the horizontal wells will influence the design of the minimum bottom hole flowing pressure avoids borehole collapse during the drilling process and the safe drilling fluid density selection as well." @default.
- W2374583885 created "2016-06-24" @default.
- W2374583885 creator A5070782219 @default.
- W2374583885 date "2014-01-01" @default.
- W2374583885 modified "2023-09-25" @default.
- W2374583885 title "Study on the Model of Wellbore Stability of Horizontal Well Drilling in Naturally Fractured Reservoirs" @default.
- W2374583885 hasPublicationYear "2014" @default.
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