海上油田自生气体系优化研究
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摘要
复合泡沫封堵技术是油田"降水增油"的有效方法,但是由于海上平台的空间局限性,气源成为制约该技术在海上油田应用的关键因素。为扩展泡沫技术在渤海高含水油田的应用,对化学生气法进行了研究。采用高温高压反应釜模拟油藏条件对自生气体系进行了优选,并研究了温度、压力、反应时间和催化剂等对自生气体系性能的影响规律。结果表明:亚硝酸钠+氯化铵体系具有生气效率高、腐蚀性低和反应速率可控的特点,优选为渤海油田复合泡沫封堵的自生气体系。在65℃和12MPa条件下,反应时间由18h延长至100h时,Na NO2+NH4Cl体系的生气效率由73.5%提高到79.9%,加入0.1%的柠檬酸作为催化剂时,反应17h时的生气效率即可达到90.3%。高温可以促进生气反应,而高压条件对反应有抑制作用,与压力相比,反应温度对生气效率的影响更加显著。
The composite foam block technology is an effective method to increase the oil recovery and decrease water cut in the oilfield development process. However,due to the spatial limitation of the offshore platform,the gas source has become a key factor restricting the application of the foam technology in offshore oilfields. In order to expand the application of foam technology in Bohai high water-cut oilfield,the chemical gas generation method was studied. The autogenous gas system was optimized by using high-temperature and high-pressure reactor to simulate the reservoir conditions,and the effects of temperature,pressure,reaction time and catalyst on the performance of the optimized system were studied. The results show that the sodium nitrite + ammonium chloride system has the characteristics of high gas generation efficiency,low corrosivity and controllable reaction rate,and it is preferably the autogenous gas system of composite foam sealing in Bohai oilfield. When the reaction time was increased from 18 h to100h at 65℃ and 12 MPa,the gas generating efficiency of Na NO2+ NH4 Cl system increased from 73. 5% to79. 9%. When adding 0. 1% citric acid as the catalyst,the gas generation efficiency can reach 90. 3% at 17 h. High temperature can promote the gas-generation reaction,but high pressure condition has an inhibitory effect on the reaction. Compared with the pressure,the reaction temperature on the gas generation efficiency is more significant.
The composite foam block technology is an effective method to increase the oil recovery and decrease water cut in the oilfield development process. However,due to the spatial limitation of the offshore platform,the gas source has become a key factor restricting the application of the foam technology in offshore oilfields. In order to expand the application of foam technology in Bohai high water-cut oilfield,the chemical gas generation method was studied. The autogenous gas system was optimized by using high-temperature and high-pressure reactor to simulate the reservoir conditions,and the effects of temperature,pressure,reaction time and catalyst on the performance of the optimized system were studied. The results show that the sodium nitrite + ammonium chloride system has the characteristics of high gas generation efficiency,low corrosivity and controllable reaction rate,and it is preferably the autogenous gas system of composite foam sealing in Bohai oilfield. When the reaction time was increased from 18 h to100h at 65℃ and 12 MPa,the gas generating efficiency of Na NO2+ NH4 Cl system increased from 73. 5% to79. 9%. When adding 0. 1% citric acid as the catalyst,the gas generation efficiency can reach 90. 3% at 17 h. High temperature can promote the gas-generation reaction,but high pressure condition has an inhibitory effect on the reaction. Compared with the pressure,the reaction temperature on the gas generation efficiency is more significant.
引文
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[9]韩再辉.油层自生气增注技术研究与应用[J].内蒙古石油化工,2013,39(13):112~113.
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