Approaches to increasing the operational efficiency of operation of oil field on the example of reducing the viscosity of oil emulsions in pipelines

UDK: 622.692.12:665.622.43
DOI: 10.24887/0028-2448-2020-1-72-76
Key words: rheological properties, high-viscosity emulsions, water cut, demulsifiers, oil production and transportation
Authors: K.S. Fot (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk), A.Yu. Zhukov (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk), S.Yu. Borhovich (Udmurt State University, RF, Izhevsk)

The possibilities of increasing the operating efficiency of oilfield exploitation with a well-developed oil gathering system complicated by highly viscous emulsions due to targeted use of the demulsifier at certain points in the pipeline system to reduce the viscosity of the transported oil-water emulsion during the course of demulsification are discussed and shown. By the example of the redistribution of the dosing points of the demulsifier, the necessity and sufficiency of supplying the reagent strictly in certain parts of the system is shown. The question of the local effect of "re-dispersion" due to overdose of the demulsifier during the transportation of oil-water emulsion is considered. It was noted that when analyzing oil gathering systems, it is necessary to carry out comprehensive measures to establish the causes of increased pressure, which are the result of various complicating factors (asphalt-resin-paraffin deposits, scaling, gas hydrates, oil-water emulsions, etc.), and technological reasons - excess flow, changes in fluid viscosity, etc. The main technological effect of the fight against highly viscous emulsions is to reduce the linear pressure in the system of oil-gathering pipelines, which not only positively affects the integrity of the system, but also leads to a significant economic effect, which consists of several components. First, there is a reduction in the total energy consumption for transporting the produced fluid; secondly, reduction of electricity consumption by sucker-rod downhole pumping equipment; and, thirdly, the most significant contribution is made by the possibility of increasing the volume of oil produced during the operation of wells with the help of electrical centrifugal pumping equipment. This approach is recommended for introduction in mature fields that are at a late stage of development, having a developed oil gathering system and having various types of complications that reduce throughput.


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