SUMMARY Detailed measurements have been made of the casing boundary layer flow before and after the nozzle blades of a single stage model air turbine. The measurements were made with the natural casing inlet boundary layer and two artificially thickened boundary layers. The results differ considerably from those usually obtained in two dimensional cascades. There was no sign of the usual second...

This research paper presents numerical studies of the characteristics of warhead fragmentation in terms of initial velocities, spray angles of fragments and fragment mass distribution of high explosive (HE) warhead. The behavior of warhead fragmentation depends on shape and size of warhead, thickness of casing, type of explosive, number and position of detonator, and etc. This paper focuses on ...

With the continuous development of oilfield, number oil and water wells is increasing, casing loss on rise. This paper analyzes researches to further understand causes loss, proposes measures protect in western part area A. It summarizes experience methods “six checks, six preventions controls” for protection, which provides direction preventing a basis reasonable development.

The emphasis placed on bonding with the introduction of Acoustic Cement Bond Logs has led to a study of many of the variables influencing this property, as well as methods for improving bond at the casing-cement interface. Special cementing problems concerning gas storage wells and tubingless completion wells have also indicated the need for better pipe-cement bonding. This presentation stresse...

The “E” well to be drilled is a development in the “P” field located North Sumatra Basin. During drilling operation using HPWBM, HPWBM used overcome shale instability. This water-based mud because it cheaper and more economical than oil-based mud. However, this needs added with other chemicals has weakness controlling formation. system design for uses offset method, which data from nearby wells...

Purpose. Developing a method for determining the axial forces and walls reactions along casing string, which bend it make follow curved wellbore shape. Methodology. The string is represented as long elastic rod in well. An inhomogeneous system of four differential equations developed to describe rods deformations. It was reduced first-order equation with respect force. Its solution found by Ber...