Viscosity Reduction of Heavy Oil by Ultrasonic
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cosity Reduction of Heavy Oil by Ultrasonic Shiyi Lva, Sen Pengb, Rongjun Zhanga, Zhen Guoa, Weichao Dua, c, Jie Zhanga, c, and Gang Chena, c, * a
College of Chemistry and Chemical Engineering, Shaanxi Province Key Laboratory of Environmental Pollution Control and Reservoir Protection Technology of Oilfields, Xi’an Shiyou University, Xi’an, 710065 China b Henan Petroleum Exploration Bureau Co., Ltd., Nanyang, 473000 China c State Key Laboratory of Petroleum Pollution Control, CNPC Research Institute of Safety and Environmental Technology, Beijing, 102206 China *e-mail: [email protected] Received January 10, 2020; revised April 16, 2020; accepted May 12, 2020
Abstract—In this paper, the effect of ultrasonic wave was evaluated on viscosity and pour point of heavy oil. The effects of time, temperature and power on the viscosity reduction of heavy oil were tested at first. The results showed that ultrasonic wave can reduce the viscosity of the heavy oil from Jinghe Oilfield effectively with the highest viscosity reduction of 87.2%. Then the pour point depressing was evaluated to find the highest pour point depression of 4.8°C. Partly recovering of the viscosity after ultrasonic treatment, the paraffin crystal morphology analysis was conducted on the heavy oil to elucidate the mechanism of viscosity reduction and pour point depression. Keywords: heavy oil, ultrasonic wave, viscosity, pour point, mechanism DOI: 10.1134/S0965544120090194
INTRODUCTION With the recoverable conventional oil reserves dwindling, exploration and utilization of heavy oil resources is becoming more and more important. In this regard, there are difficulties in the extraction and transportation of oil with such high viscosity, which are caused by their abnormal rheological behavior (Bingham fluids) [1]. Heavy oil resource in China is widely distributed with largely reserved. But the viscosity of heavy oil is high and the flowability is poor, which affects the costs and benefits of heavy oil exploitation directly, and also bring a lot of inconvenience during mining and transportation [2]. At present, the viscosity reduction method of heavy oil is mainly divided into two categories: physical viscosity reduction and chemical viscosity reduction, among which ultrasonic viscosity reduction technology is a kind of physical viscosity reduction. As a new method of oil recovery in the 1960s, ultrasonic has been successfully applied to commercial mining in some developed countries, and has achieved desired results. However, China started late in ultrasonic oil recovery technology, and it has only invested this technology in the exploitation of heavy oil in the past decade. Application of ultrasonic technology in heavy oil viscosity reduction is also a new technology that has developed rapidly in recent years [3]. Many researchers have conducted experiments on ultrasonic treatment of heavy oil [4, 5], and the results show that the ultrasonic has a certain effect on heavy oil, so that the orig-
inal viscosity is reduced by 20 to 30%. At present, facing th
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