Article

Article title ANALYSIS OF SPATIALLY DISTRIBUTED TEMPERATURE FIELDS IN PULSED CONTROL SYSTEM FOR EXTRACTION OF HIGH-PARAFFINE OIL
Authors Yu. V. Ilyushin
Section SECTION III. AUTOMATION AND CONTROL
Month, Year 05, 2018 @en
Index UDC 681.5
DOI
Abstract Hard-to-recover oils are determined by a sufficiently large number of physico-chemical characteristics and one of the factors that classify oils as difficult-to-recover among chemical properties is a high paraffin content. It is known that in 2017, 510 million tons of oil was extracted in Russia, more than 75 % of that is oil with a high content of paraffins. The constant increase in the share of such oils in the total volume of oil produced poses a number of difficult technical problems for oilmen. Paraffin deposits in the bottomhole formation zone and on the surface of oil field equipment is one of the serious complications in the operation of wells and pipeline transport. Paraffin deposits reduce the filtration characteristics of the reservoir, clog pores, reduce the useful section of tubing and, as a result, significantly complicate the production and transportation of oil, increase power consumption in a mechanized method of production, lead to increased equipment wear. Technological processes of production, transport and preparation of oil to a large extent depend on the value of viscosities. Viscosity is the most common characteristic of the rheological (fluid) behavior of liquids. For Newtonian objects, it is exhaustive. For non-Newtonian objects, viscosity cannot fully characterize the property of fluidity, but if a substance is processed using “liquid” technological devices and the corresponding technology, it can be called “liquid-like” and characterized by a set of effective values. When transporting oil through a pipeline, a metastable (stable, inclined to change) hydrocarbon liquid is displaced, prone to precipitation of a solid phase, in the technological range accompanied by a change in temperature. The transition from a homogeneous fluid to a heterogeneous system - a phase transition has rheologically significant consequences and is accompanied by a change in fluidity. The mechanism of loss of turnover can be different. As a result of “structural solidification,” it becomes possible to isolate various levels of viscosity in the object under consideration - macroscopic, determining the flow and mechanical resistance to movement of a large submerged body, and microscopic, determining, for example, the diffusion of low molecular weight components. In this article, a mathematical model of the motion of highly paraffinic oil along the tubing string is constructed, the method of forming the temperature field using pulsed sectional heaters is considered, the temperature field control system is synthesized, and a numerical experiment is run on a sample of oil from the Sable field.

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Keywords Analysis; observation; deposit; extraction; oil.
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