Energy consumption reducing in oil production is one of the key directions for increasing its efficiency. Improving and simplifying oil and gas gathering and transport systems plays an important role both to reduce costs and expenses, and to shorten the time of installation and commissioning of new oilfields. One-pipe (oil is piped to the central collection point in a gas-saturated condition) system for collecting multiphase production of wells is the most demanded in the oil industry. This system creates conditions for the centralization and rowing of oilfield facilities, excluding the use of compressor equipment, the construction of an additional infrastructure with separation facilities and gas pipelines, which, unlike traditional methods of collecting, reduces the production cost and the development of remote hard-to-reach oilfields with extended system of pipelines. The use of such a collection system allows to increase the level of oil production by lowering the pressure on the well head and increasing drawdown in the reservoir .In addition, the one-pipe collection system solves the problem of prohibiting the flaring of associated petroleum gas. Cavity and axial multiphase pumps are the most frequently used. However, the cavity pump can`t tolerate increased content of abrasive particles in oil, due to increasing rotor and stator wear, which reduces the flow rate and causes the pump to fail completely as a result of overheating of the elastomer, its melting and adherence to the rotor. So the multiphase axial pump is more sophisticated device for surface transfer of gas-liquid mixture. A pressure which is created by the multiphase axial pump will make it possible to work without compressors, burning flares, venting gas into the atmosphere, and separated commercial pipelines. The multiphase axial pump is able to create a pressure boost, pumping gas-liquid fluid over the surface to centralized oil and gas collection points, and also to work under low pressures at the pump inlet. These advantages make multiphase axial pump one of the best tools for oilfields exploitation with a large amount of associated gas. However, the currently existing designs of multiphase axial pumps which are capable to transport gas-liquid mixture with an input gas content of at least 90% can work only for flow rate above 3000 m3/day.
The main goal of this work is to select the design of a multiphase axial pump, which will pump the gas-liquid mixture with β in at least 90 % at flow rates of less than 3000 m3/day, and ensure reliable operation of the pump within 2 years. Achieving the set goal will solve the problem of irrational use of associated petroleum gas, as well as resume the operation of depleting and remote wells by developing more sophisticated equipment.
References
1. Patent no. 2531090 RF, Method to test gas separators on gas-liquid mixtures and method for its realisation, Inventors: Ostrovskiy V.G., Perel'man M.O., Peshcherenko S.N.
2. Patent no. 2428588 RF, Submerged multi-phase pump, Inventors: Peshcherenko M.P., Peshcherenko S.N., Kobyakov A.E. et al.
3. Drozdov A.N., Tekhnologiya i tekhnika dobychi nefti pogruzhnymi nasosami v oslozhnennykh usloviyakh (Technology and engineering of oil production using submersible pumps under complicated conditions), Moscow: MAKS press Publ., 2008, 312 p.
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