Substantiation of analytical dependences for hydraulic calculation of high-viscosity oil transportation

Abstract

One of the development priorities in oil and gas industry is to maintain gas and oil pipeline networks and develop pipeline-connected gas and oil fields of the Arctic zone of the Russian Federation, a promising region the resource potential of which will not only meet a significant portion of internal and external demand for various types of raw materials and primary energy carriers, but will also bring great economic benefits to subsoil users and the state. The mineral and raw material centers of the Nadym-Purskiy and Pur-Tazovskskiy oil and gas bearing areas are among the most attractive regions of the Arctic zone. It is necessary to develop a scientifically substantiated approach to improve the methods of oil transportation from the field to the existing pipelines. As it is known, the task of increasing the efficiency of pipeline transportation of high-viscosity oil is inseparably connected with solving problems in the field of thermal and hydraulic calculation of pipeline system. The article presents the substantiation of dependencies for hydraulic calculation of pipelines transporting high-viscosity oil exhibiting complex rheological properties. Based on the laws of hydraulics for non-Newtonian fluids, the formulas for calculating head losses for fluids obeying Ostwald's law are proposed, their relationship to the classical equations of hydraulics is shown. The theoretical substantiation of looping installation for increasing the efficiency of pipeline transportation of high-viscosity oil taking into account the received dependences for power fluid is considered.

Development of the automated temperature control system of the main gas pipeline

“…In other studies, conducted by Lanzano, Erickson, and Nikolaev, the authors analyzed the pipeline infrastructures, presented their calculation methods under various operating conditions, and substantiated the dependences of the hydraulic calculation of oil pipelines transporting high-viscosity oils with complex rheological properties 2 – 4 . Moreover, Chizhevskaya et al presented a system of managerial decisions based on the analysis of the work of dispatchers at oil and gas transport facilities.…”

Analyzing Efficiency of Joint Operation of Gas Separator and Screw Pump on High-viscosity Gas-liquid Mixture

“…Nikolaev and Zaripova (26) qualitatively considered the issue of increasing the efficiency of screw pump installations in complicated operating conditions, conducted bench studies of the pressure characteristics of the screw pump taking into account the modeling of the screw pump operation on gas-liquid mixtures. The author points out that UEWP have significant limitations on the developing torque of the submersible motor and, therefore, operates with a gap or a small tension in the pair "rotor -stator", which predetermines the need to increase the rotor speed in accordance with the operating conditions of the system: "reservoir -well -pumphoist", pressure-flow characteristics in this case correspond to the characteristics of dynamic pumps.…”

“…The author points out that UEWP have significant limitations on the developing torque of the submersible motor and, therefore, operates with a gap or a small tension in the pair "rotor -stator", which predetermines the need to increase the rotor speed in accordance with the operating conditions of the system: "reservoir -well -pumphoist", pressure-flow characteristics in this case correspond to the characteristics of dynamic pumps. The methodology for determining the ultimate pressure developed by a screw pump, taking into account the coefficients that take into account the properties of the pumped mixture (26):…”

Numerical Simulation of Nonlinear Processes in the “Thruster—Downhole Motor—Bit” System While Extended Reach Well Drilling

“…The diaphragm pressure drop is determined by: It is assumed that the greatest pressure losses occur when the drilling mud passes through the diaphragm; in the course of the calculation, they are taken as the pressure drop of the device. The pressure drop across the diaphragm is calculated by the classical method [35]:…”