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The theoretical research of an upward two-phase flow with phase’s changes in a vertical well

It is shown, that at the using of an installation of electrical centrifugal pumps and variation of its metering characteristic, depth of its setting, it is possible to achieve the optimum temperature mode on all the well’s height and to prevent by it formation of paraffin deposits. | Vietnam Journal of Mechanics, VAST, Vol. 32, No. 4 (2010), pp. 211 – 221 THE THEORETICAL RESEARCH OF AN UPWARD TWO-PHASE FLOW WITH PHASE’S CHANGES IN A VERTICAL WELL Shagapov V.Sh.1 , Borodin S.L.2 , Gubaidullin A.A.2, Duong Ngoc Hai3 , Musakaev N.G.2 1 Birsk State Social-and-Pedagogical Academy, Russia, 2 Tyumen Branch of Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Russia, 3 Institute of Mechanics, VAST, Vietnam. Abstract. By methods of mechanics of multiphase systems the mathematical model describing an upward gas-and-oil flow in a vertical well is constructed. The model considers phase’s changes, deposition of oil paraffin on the elevating column’s walls of the well, influence of an installation of electrical centrifugal pumps on parameters of the gas-and-oil flow, and also heat exchange of the well with surrounding rock. It is shown, that at the using of an installation of electrical centrifugal pumps and variation of its metering characteristic, depth of its setting, it is possible to achieve the optimum temperature mode on all the well’s height and to prevent by it formation of paraffin deposits. 1. INTRODUCTION Many oil fields are characterized by high content in oil of heavy high-molecular hydrocarbons (oil paraffin). Movement of such oil from reservoirs to oil-gathering systems is complicated by processes of formation in pipes hard paraffin deposits. Primary reason of paraffin’s deposition is reduction of temperature in a well which leads to reduction of oil’s dissolving ability. Therefore at research of an upward gas-and-oil flow in a vertical well it is necessary to take into account three interconnected factors: hydrodynamics and thermal physics of the gas-liquid flow in the well, growth of paraffin deposits on the inner wall of the well’s elevating column, thermal interaction of the gas-liquid flow in the well with surrounding rock. If the well are being exploiting by an installation of electrical centrifugal pumps (IECP),