Temperature field in a well with casing induction heating: considering the natural convection influence

IF 0.5 4区工程技术 Q4 ENGINEERING, AEROSPACE Thermophysics and Aeromechanics Pub Date : 2023-10-23 DOI:10.1134/S0869864323030083

R. Z. Akchurin, F. F. Davletshin, D. F. Islamov, R. A. Valiullin, R. F. Sharafutdinov

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Abstract

One of the promising methods of geophysical research in operating wells is active thermometry. The method consists in creating an artificial temperature field in a well due to local heating of the metal casing. Observation of heat tags movement enables determining the fluid flow rate in the well and identifying the intervals of the behind casing flow.

The article is devoted to the study of non-stationary thermal processes in a well during induction heating. The calculations were performed in the commercial simulator Ansys Fluent. It was established that with an increase in the volumetric flow rate through the column from 5 to 50 m³/day for the modeling conditions, the maximum heating of the liquid (a change in the average mass cross-section temperature) is reduced by 85 %, and the maximum heating of the column is reduced by 7 %. The influence of natural convection on the formation of a temperature field in a liquid and a column has been studied. For the model with natural convection accounted, the column heats up significantly less than for the model without convection: the error in calculating the temperature changes due to neglect of natural convection can reach several hundred percent. During the process of induction heating for the casing, the effect of natural convection remains significant throughout the entire flow range of 5–50 m³/day.

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考虑自然对流影响的套管感应加热井内温度场

主动测温法是在油井中进行地球物理研究的一种很有前途的方法。该方法包括由于金属套管的局部加热而在井中产生人工温度场。通过观察热标签的运动，可以确定井中的流体流速，并确定套管后流量的间隔。本文致力于研究感应加热过程中井内的非平稳热过程。计算是在商业模拟器Ansys Fluent中进行的。已经确定，在建模条件下，随着通过柱的体积流速从5m3/天增加到50m3/天，液体的最大加热（平均质量横截面温度的变化）减少85%，柱的最大加热减少7%。研究了自然对流对液体和柱中温度场形成的影响。对于考虑了自然对流的模型，柱的升温明显小于没有对流的模型：由于忽略自然对流，计算温度变化的误差可能达到百分之百。在套管感应加热过程中，自然对流的影响在5–50 m3/天的整个流量范围内保持显著。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermophysics and Aeromechanics THERMODYNAMICS-MECHANICS

CiteScore

0.90

自引率

40.00%

发文量

审稿时长

>12 weeks

期刊介绍： The journal Thermophysics and Aeromechanics publishes original reports, reviews, and discussions on the following topics: hydrogasdynamics, heat and mass transfer, turbulence, means and methods of aero- and thermophysical experiment, physics of low-temperature plasma, and physical and technical problems of energetics. These topics are the prior fields of investigation at the Institute of Thermophysics and the Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences (SB RAS), which are the founders of the journal along with SB RAS. This publication promotes an exchange of information between the researchers of Russia and the international scientific community.