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2011-3-12 11:42:33http://www.cnki.net/kcms/detail/13.1093.TE.20110312.1142.005.html

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/ km

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5 30-1 21-1B

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Vacuum-drying technique applied in Panyu-Huizhou Submarine Gas Pipeline

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2 30-1

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.[J].200521(8)30-32.

.[J].200625(10)26-29.

(2010-08-05)

[1]

[2]

1979 2002 13113621681Emailkangyl@mail.cooec.com.cn

30-1 4 30-1

3OIL & GAS STORAGE AND TRANSPORTATION

OGSTMar.25,2011 Vol.30 No. 3 Total 267

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Vol. 30 No. 3 (Total 267) Mar. 25, 2011

ABSTRACTS

INTEGRITY / TRANSPORTATION PROCESS / EXPERIMENT & RESEARCHEvaluation on explosion consequence caused by leakage of long-distance gas pipelineChang LiangShuai JianZhou Xiaolianget alOGSTVol. 30 No. 3, pp. 161165, 3/25/2011. ISSN 1000-8241In ChineseGas pipeline leaks due to various factors such as corrosionnatural destructionhuman destruction and its own defects etcin which the vapor cloud explosion will induce the most serious consequences of pipeline failure. In order to assess the material losscasualties and property damage accurately in the explosion consequencethree kinds of quantitative evaluation methods for the consequences of failure are compared and analyzed to determine their application conditions and the application scopes combined with practical engineering cases. Results show that the assessment procedure in API 581 evaluation model is clear and concise with complete and wide application rangecompared with the evaluation model and overpressure-impulse evaluation model in ASME B31.8S-2001which gives a guide for pipeline risk assessment and integrity management.Key wordslong-distance gas pipelinevapor cloud explosionrisk assessmentconsequences modelintegrity managementChang LiangCNPC Research Institute of Engineering TechnologyTianjin300451.Tel022-66316907Emailiamfi go_2006@yahoo.com.cnSafety evaluation and suggestion on shutdown and restart for Qinhuangdao-Beijing Oil PipelineMiao QingSong JianheGao Guopinget alOGSTVol. 30 No. 3, pp. 166169, 3/25/2011. ISSN 1000-8241In ChineseQinhuangdao-Beijing Oil Pipeline is closely running at the minimum specifi ed throughputand its fl ow safety issue is of great concern. In the light of lacking of quantitative evaluation resultsthe safety evaluation of shutdown and restart for Qinhuangdao-Beijing Oil Pipeline operated under the conditions of current throughput and the allowable shutdown time is carried out by means of the crude oil pipeline shutdown and restart congelation probability calculation softwareand the suggestion on reasonably distributing safety margin between stations is put forward. Besidesthe flow safety evaluation results and the feasibility in optimizing process parameters between stations are discussed. The safety for most of the stations in Qinhuangdao-Beijing Oil Pipeline are satisfactory from most of months to the yearand the reasonable allocation of safety margin can be made by reducing the inlet temperature or extending the shutdown time and other methods. The results can provide a guaranty to the economic transportation for Qinhuangdao-Beijing Oil Pipeline under the precondition of fl ow safety. Key wordsoil pipelinefl ow safetyshutdown and restartcongelationoptimizationevaluationMiao QingChina University of Petroleum (Beijing)Beijing102249.Tel0316-2173696Emailmiaoqing@petrochina.com.cnModeling theory of online and offl ine simulationLi YingdongXu HuiLiu Chunyanget alOGSTVol. 30 No. 3, pp. 170172, 3/25/2011. ISSN 1000-8241In ChineseThe online real-time monitoring system and offl ine training model for Yanan-Xian Products Pipeline are built by using SPS dynamical simulation software from GL Company. It is required to obtain the key data from SCADA system to drive the model in the online real-time system. The SPS online simulation is based on the black box theory. It makes use of the discharge pressuresuction pressurefl ow ratetemperature and other data to do the hydraulic simulation. The simulation results can be used for instrument analysisleak detection and locationpig tracingprediction of pressuretemperature and fl ow rate at any point of the pipeline. The online real-time simulation can provide advice for the starting/shutting down operationand it is a valuable reference to understand the pipeline hydraulics.Key wordsonline simulationoffl ine simulationYanan-Xian Products Pipelinetheorywhite boxblack boxLi YingdongCNOOC Hainan Natural Gas Co.LimitedHaikouHainan570105.Tel0898-68523001Emailhnlyd@126.comVacuum-drying technique applied in Panyu-Huizhou Submarine Gas PipelineKang YilongZhang RengongLai Junchenget alOGSTVol. 30 No. 3, pp. 173176, 3/25/2011. ISSN 1000-8241In ChineseBecause the submarine gas pipeline in Panyue 30-1 Gasfi eld is characterized by a long distance and large diametertherefore vacuum drying technique is chosen as the method to dry the pipeline in pre-commissioning stage. Four factors that will impact

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the vacuum drying time in pipe lengthpipe diameternominated suction speed of pump and thickness of water fi lm are analyzed and an optimization method is presented. For the pump optimizationthe costconstruction progressrisk and other factors need to be considered before the determination of the pump. Water fi lm thickness optimization adopts the dried air produced by drying machine as the propulsion medium for the spill sphere. The more desiccated the medium isthe better the effect will be. Considering power range of compressors and the capacity of the spill sphere trapmore empty spheres should be arranged and the travelling speed of the spheres should be limited. The vacuum drying practice shows the correctness of the drying prediction time and the existed experience will be a good reference for the similar projects in submarine vacuum drying technique.Key wordsgas pipelinesubmarine pipelinevacuum drying techniquedrying timeoptimizationKang YilongOffshore Oil Engineering Co. LimitedTianjin300451.Tel13113621681Emailkangyl@mail.cooec.com.cn

Selection on viscosity reducer for extra-heavy oil and corrosion inhibition effectiveness evaluationWang Xia and Bai YuanliOGSTVol. 30 No. 3, pp. 177179, 3/25/2011. ISSN 1000-8241In ChineseExtra-heavy oil is featured with gelatinationhigh content asphaltenehigh viscosityhigh density and poor fl owability. At present viscosity reducer is mainly used to cut down its viscosity. Howeverthe solution of viscosity reducer will probably tend to corrode oil pipeline. In allusion to the property of extra-heavy oil produced from Henan Oilfiledorthogonal experimental method is adopted to research the viscosity reducing effectiveness of emulsifi ed viscosity reducer AE and EC and oil-soluble viscosity reducer AC. Static corrosion weight loss method are applied to evaluate the corrosion level of the above 3 viscosity reducers on N80 steel in order to select appropriate candidate. Results from the orthogonal experiment display that the best viscosity reducer is EC with a 99.81% of viscosity reducing rate when it is used at 70 with a 0.3% of addition volume and a 64 of oil-water ratioresults from corrosion experiment show that AE and EC have sound corrosion inhibitation effectiveness and the corrosion inhibitation rates of the two reducers are up to 80.42% and 85.85%respectively.Key wordsoil pipelineextra-heavy oilviscosity reducerselectioncorrosion inhibitationcorrosionevaluationWang XiaDepartment of Materials Science and EngineeringSouthwest Petroleum UniversityChengduSichuan610500.Tel13881705708Emailswpi_wx@126.comMixing experiment and critical proportion calculation for contamination of productsLi HuiduoLiang JinghuaZhu Fenget alOGSTVol. 30 No. 3, pp. 180182, 3/25/2011. ISSN 1000-8241In ChineseContamination treatment is one of the key links of operation management for long-distance products pipeline. Based on the method of mixing some or all contamination back to the pure oilaccording to the quality control indicators and testing methods regulated by GB 17930-2006 motor gasoline and GB/T 19147-2003 motor diesel fuelcombined with the actual operating situation of batch transportation pipeline in Chinaa mixing experiment of batch transportation oil is carried out for the particular pipeline. The results show that in diesel mixed with gasolinethe most sensitive quality item to mixing proportion is the closed fl ash pointin gasoline mixed with dieselthe signifi cant infl uence on quality item is fi nal boiling pointresearch octane numberanti-explosion indexand the sensitivity of the fi nal boiling point is the most prominent. According to the testing resultscritical mixing proportion calculation formula available for the actual production is recommended with the sensitive quality item as the control target.Key wordsproducts pipelinebatch transportationcontaminationmixingexperimentcritical mixing proportioncalculation formulaLi HuiduoPetroChina Pipeline R&D CenterLangfangHebei065000.Tel0316-2077914Emaillhdgkj@163.com

DESIGN & CALCULATION / INSPECTION TECHNOLOGYInfl uence of reduced pipeline on the batch transportation of cold-hot contaminated crude oilLu QinliDu MingjunMa Guiyanget alOGSTVol. 30 No. 3, pp. 183186, 3/25/2011. ISSN 1000-8241In ChineseThe governing equation is established regarding the effect of hydraulic transient on the contamination ratio of the cold-hot contaminated crude oil batch transportation due to reduced pipeline or elevation. FLUENT software is applied to simulate the cold-hot crude oil passing through the reduced pipeline where the effect of the transportation sequence and the velocity are investigated. The study shows that the contamination length grows faster in the reduced pipelinewhile the length grows slower in the expanded pipeline. The contamination lengths are large for both cases of Russian Oil fi rst and Daqing Oil fi rst. Andthe contamination ratio vibrates at the joint location of an expanded pipeline with regard to the cross-sections on upstream pipeline.Key wordscrude oil pipelinehydraulic transientcold-hot crude oilbatch transportationcontamination rationumerical calculationLu QinliLiaoning Shihua UniversityFushunLiaoning113001.Tel15841344152Emailluqinli123@126.comTemperature fi eld simulation of heavy oil dehydration sediment tankHan HaicangOGSTVol. 30 No. 3, pp. 187191, 3/25/2011. ISSN 1000-8241In ChineseLiaohe Oilfield mainly produces heavy oil. The oil is pipelined from oil well to complex station for dehydration processing. Howeverthe sediment tank structure and oil/water velocity field are differentwhich result in the fluctuation of temperature