A Study of Asphaltene Onset Pressure during High-Pressure Gas Injection
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摘要: 为预防注烃类气体提高采收率过程中产生沥青质沉淀,对沥青质初始沉淀压力进行了试验研究.在分析注烃类气体过程中沥青质沉淀机理的基础上,通过自主研发的固相沉积激光探测装置,采用透光强度法测定了原油样品在不同温度下高压注气过程中沥青质的初始沉淀压力,并确定了沥青质沉淀的深度.试验得出,原油沥青质初始沉淀压力随温度升高而下降,测得44,80和123 ℃温度下原油的沥青质初始沉淀压力分别为44.1,39.7和35.2 MPa;每注入物质的量分数为1%的烃类气体,试验油样的沥青质初始沉淀压力升高0.5~0.6 MPa;井筒温度压力曲线与沥青质沉淀相包络线相结合预测井筒中出现沥青质沉淀的深度在1 800 m左右,与现场情况吻合较好.研究表明,原油中沥青质初始沉淀压力与注气量之间呈线性关系,可为现场注气驱油预防和清除沥青质沉积物提供理论依据.Abstract: In order to avoid asphaltene precipitation caused by gas injection for enhanced oil recovery, the asphaltene onset pressure (AOP) was tested in the laboratory. On the basis of the analysis of the asphaltene precipitation mechanism during gas injection, the asphaltene onset pressures under different temperatures were measured along with crude oil samples in the process of high-pressure gas injection, by using the self-developed laser solid detection system and the light transmission method, so as to determine the depth of asphaltene precipitation. The results demonstrated that the asphaltene onset pressure decreases with the increase of temperature, AOP are 44.1 MPa, 39.7 MPa and 35.2 MPa at the temperatures of 44 ℃, 80 ℃ and 123 ℃ respectively in the experiment;the asphaltene onset pressure increases 0.5-0.6 MPa when amount of substance fraction 1% of hydrocarbon gas is injected. According to the asphaltene deposition envelope and wellbore temperature-pressure curve, it is predicted that asphaltene precipitates at a depth of 1 800 m, which matched the field conditions very well. The study suggested that there is a linear correlation between the volume of gas injection and the asphaltene onset pressure, which could provide a theoretical basis for preventing and removing asphaltene precipitate in gas injection on site.
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[1] 楚艳苹,胡玉峰,明云峰,等.高压注气过程中沥青质沉淀机理及规律的实验研究[J].石油大学学报:自然科学版,2003,27(2):74-77. Chu Yanping,Hu Yufeng,Ming Yunfeng,et al.Experiment on precipitation amount and mechanism of asphaltene in high-pressure gas injection process[J].Journal of the University of Petroleum,China:Edition of Natural Science,2003,27(2):74-77. [2] 黄磊,沈平平,贾英,等.CO2注入过程中沥青质沉淀预测[J].石油勘探与开发,2010,37(3):349-353. Huang Lei,Shen Pingping,Jia Ying,et al.Prediction of asphaltene precipitation during CO2 injection[J].Petroleum Exploration and Development,2010,37(3):349-353. [3] 黄磊,贾英,全一平,等.CO2驱替沥青质原油长岩芯实验及数值模拟[J].西南石油大学学报:自然科学版,2012,34(4):135-140. Huang Lei,Jia Ying,Quan Yiping,et al.The long core experiment and numerical simulation research on asphaltic oil with CO2 flooding[J].Journal of Southwest Petroleum University:Science Technology Edition,2012,34(4):135-140. [4] Pan H,Firoozabadi A.Thermodynamic micellization model for asphaltene precipitation from reservoir crudes at high pressures and temperatures[R].SPE 38857,1997.
[5] Victorov A I,Firoozabadi A.Thermodynamic micellizatin model of asphaltene precipitation from petroleum fluids[J].AIChE Journal,1996,42(6):1753-1764.
[6] Pan H,Firoozabadi A.Thermodynamic micellization model for asphaltene aggregation and precipitation in petroleum fluids[J].SPE Production Facilities,1998,13(2):118-127.
[7] 胡玉峰,杨兰英,林雄森,等.原油正构烷烃沥青质聚沉机理研究及沉淀量测定[J].石油勘探与开发,2000,27(5):109-111,114. Hu Yufeng,Yang Lanying,Lin Xiongsen,et al.N-alkane asphaltene precipitation and the mechanism of their formation[J].Petroleum Exploration and Development,2000,27(5):109-111,114. [8] Burke N E,Hobbs R E,Kashou S F.Measurement and modeling of asphaltene precipitation(includes associated paper 23831)[J].Journal of Petroleum Technology,1990,42(1):440-441.
[9] Jamaluddin A M,Creek J,Kabir C S,et al.Laboratory techniques to measure thermodynamic asphaltene instability[J].Journal of Canadian Petroleum Technology,2002,41(7):44-52.
[10] Joshi N B,Mullins O C,Jamaluddin A,et al.Asphaltene precipitation from live crude oil[J].Energy Fuels,2001,15(4):979-986.
[11] Zhou Y,Sarma H K.Asphaltene precipitation behavior during gas injection in a UAE carbonate reservoir and a faster experimental strategy to predict asphaltene onset pressure[R].SPE 161147,2012.
[12] Roshanaei Zadeh G A,Moradi S,Dabir B,et al.Comprehensive study of asphaltene precipitation due to gas injection:experimental investigation and modeling[R].SPE 143454,2011.
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