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Wang H.,China University of Petroleum - East China | Li Y.,China University of Petroleum - East China | Cai X.,Petrochina | Song C.,Daqing Oilfield Construction Design and Research Institute | Meng L.,Daqing Oilfield Construction Design and Research Institute
Huagong Xuebao/CIESC Journal | Year: 2013

In gas-liquid flow, slug flow can be related to other flow patterns, if the hydrodynamic model is developed from slug flow, models of different flow patterns can be unified. Momentum and continuity equations were developed based on slug flow, and simulation of bubble and droplet entrainment was optimized. For the important parameters (wall and interfacial friction factors, slug translational velocity and average slug length), the correlations of these parameters were optimized. Meanwhile, occurrence conditions and correlations of related parameters for liquid droplets and gas bubbles entrainment were given. Finally, a unified model based on slug flow for gas-liquid flow was developed. Experimental data from different sources were used to verify the model. The data with various flow patterns were taken from China University of Petroleum (East China), Daqing Oilfield and foreign researchers. The accuracy of this model was higher than the original model without improvement and optimization of correlations. The relative errors of most pressure drop and holdup data calculated with this model were within ±15%. © All Rights Reserved.


Liang C.,Dalian Maritime University | Zheng R.,Dalian University of Technology | Zheng R.,Daqing Oilfield Construction Design and Research Institute | Huang N.,Dalian Maritime University
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2013

The atmospheric corrosion behavior of extruded AZ31 magnesium alloy and pure magnesium samples was studied after they were exposed to Dalian maritime climate for 400 d. The corrosion image feature was analyzed and the corrosion dynamics equations were calculated by image methods. The results indicated that the samples were covered with plumbeous corrosion product film. Some insulated "islands" were observed on the surface of slight corrosion area. Deep etch pit appeared between these insulated "islands". The proportions of the corrosion region to the general area were 65.0% and 42.3% on AZ31 and pure magnesium, respectively. The corrosion products of AZ31 magnesium alloy were mainly composed of MgO, Mg(OH)2, Al(OH)3, Al2O3 and carbonate, sulfate and chloride of Mg and Al. The corrosion products of pure magnesium were similar to that of AZ31 magnesium alloy except for Al. The corrosion kinetics calculated by image methods accorded with exponential equation (H=C×tn) and the dynamics equations for AZ31 and pure magnesium were HAZ31=0.403×t0.653 and HP Mg=0.549×t0.665, respectively. The corrosion depth of AZ31 and pure magnesium were 20.2 and 29.3 μm, respectively. The latter was 1.45 times higher than the former.


Yu T.,Daqing Oilfield Construction Design and Research Institute
Advanced Materials Research | Year: 2011

With mixed rare earth (La, Ce, Nd) doping Ti/TiO2 electrode for the anode, degradation situation of oilfield wastewater was studied. The results showed that electrocatalysis technology excels at treating oilfield wastewater. Electrocatalytic oxidation reaction kinetic equation: At=A 0exp(-7.02×10-7D-1.42M -1.66U3.40t). © (2011) Trans Tech Publications, Switzerland.


Song H.,Daqing Oilfield Construction Design and Research Institute
Carbohydrate Polymers | Year: 2010

A graft copolymer was synthesized by graft copolymerization of starch with acrylamide (AM) and acrylacyloxyethyltrimethyl ammonium chloride (AAC). The copolymerization was carried out by using a complex initiation system of urea [CO(NH 2) 2] and ammonium persulfate [(NH 4) 2S 2O 8]. The effect of reaction conditions on graft copolymerization and the application of the polymer as the flocculant were investigated. Experiments showed that a graft copolymer with higher grafting level and higher intrinsic viscosity could be obtained by changing the method of monomer addition and by controlling the ratio of AAC to AM. The application test showed that the results of treatment of two kinds of industrial waste water by the grafted starch [S-g-P(AM-co-AAC)] were better than those treated with cationic polyacrylamide (CPAM). © 2010 Elsevier Ltd. All rights reserved.


Song H.,Daqing Oilfield Construction Design and Research Institute
Proceedings - SPE International Symposium on Oilfield Chemistry | Year: 2011

An amphoteric starch-graft-polyacrylamide (S-g-PAM) was prepared by inverse emulsion polymerization, subsequent hydrolysis reaction and Mannich reaction. The effects of reaction conditions on copolymerization and the use of the polymer as the water clarifier in oilfield water treatment were investigated. The application test showed that the results of oilfield waste water treatment by amphoteric S-g-PAM were better than those treated with cationic Polyacrylamide (PAM), hydrolytic PAM and amphoteric PAM. Copyright 2011, Society of Petroleum Engineers.


Song C.-Y.,Daqing Oilfield Construction Design and Research Institute | Tan Q.-X.,Daqing Oilfield Construction Design and Research Institute
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2015

Based on experiment and correction research on multiple structure of multiple-pipe type slug catcher visualization prototypes, effect of the downcomer slope, downcomer constrictors, bottle slope, different inlet header and layout of up-level bottle of double-layer structure, height of gas outlet header on slug catcher operating properties was studied in detail, determined the design parameters which different from foreign convention, formed the multiple-pipe type slug catcher design method with independent intellectual property rights and more applicable to engineering. © 2015, Science Press. All right reserved.


Liang C.-H.,Dalian Maritime University | Zheng R.-F.,Daqing Oilfield Construction Design and Research Institute | Huang N.-B.,Dalian Maritime University
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2013

To study the effects of atmospheric pollutants on the corrosion of magnesium alloys, the electrochemical corrosion behavior of extruded AZ31 magnesium alloy in thin electrolyte layers with NaCl or Na2SO4 was studied by indoor atmospheric exposure test. The results indicated that the corrosion kinetics of AZ31 magnesium alloy in thin electrolyte layers accorded with a power function. It revealed that NaCl and Na2SO4 could quicken the alloy's corrosion. In the thin electrolyte layers with NaCl, the result of potentiodynamic polarization showed that with the thinning of electrolyte layers, the alloy's polarization current density at more positive polarized potential increased. The consequence of AC Impedance showed that the value of Rf and Rct decreased. All these accelerated cathodic depolarization process, enhanced anodic activity and aggravated the dissolution of magnesium alloy. In the thin electrolyte layers with Na2SO4, the value of the value of Rf and Rct increased and the difference between breakdown and corrosion potential decreased with the thickness of thin electrolyte layers lessening. These was caused by the deposition of insoluble sulfate and Mg(OH)2 on the surface. The droop of metal dissolution and ionic diffusion blocked the anode process.

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