CIESC Journal ›› 2018, Vol. 69 ›› Issue (8): 3398-3407.doi: 10.11949/j.issn.0438-1157.20180088

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Drag characteristics of air-mixed heavy oil in horizontal pipes

JING Jiaqiang1,2, YIN Ran1, MA Xiaoliang4, SUN Jie1, WU Xi3   

  1. 1 School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China;
    2 Oil & Gas Fire Protection Key Laboratory of Sichuan Province, Chengdu 611731, Sichuan, China;
    3 Sichuan Hongda Petroleum & Natural Gas Company Limited, Chengdu 611700, Sichuan, China;
    4 Petrochina Tarim Oilfield Sales Department, Kuerle 841000, Xinjiang, China
  • Received:2018-01-19 Revised:2018-03-05 Online:2018-08-05 Published:2018-03-30
  • Supported by:

    supported by the National Natural Science Foundation of China (51779212), the National Science and Technology Major Projects(2016ZX05025004-005) and the Science and Technology Project of Sichuan Province (2015JY0099).

Abstract:

Based on visualizable fluid circuit, a lab-scale setup for drag reduction of aerated heavy oil was designed. Two heavy oil models mixed with air were experimentally studied for flow resistance characteristics in horizontal pipe. Photos were taken to capture fluid flow patterns in pipe at various air liquid ratios. The drag reduction effect of air on heavy oil at different conditions was analyzed and a corresponding pressure drop prediction model was established. At gas-liquid ratios ranged from 0 to 15, six flow patterns were observed, i.e., bubbly flow, plug flow, stratified flow, slug flow, annular flow and spray flow. The drag reduction rate of 220# and 440# model oils reached peak at 48.19% and 33.76% at air liquid ratio of 1.17 and 0.96 respectively. When the ratio was in a range of 0.9 to 1.2, drag reduction rate of both oils could be maintained at 20%. The mechanism of drag reduction was attributed to that air changed interface from oil-oil to oil-gas-oil such that shear stress between layers of mixed phase could be lowered. The Dukler's method is not applicable to gas-liquid two-phase flow of high viscosity oil, however, the established heavy oil-gas two-phase pressure drop model predicts well with measurement which has less than 20% average relative standard error.

Key words: heavy oil, gas-liquid flow, aerated drug reduction, flow patterns, viscosity, vapor liquid ratio, model

CLC Number: 

  • TE832

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