利用高碳气运移驱替开发高烃气的机理研究及效果预测
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摘要
南海西部莺歌海盆地部分气藏高含CO_2,常规开发方法下直接采出的经济价值较低,且不利于环保。提出通过建立高碳气藏与已开发高烃气藏之间的运移通道,依靠层间压力差将高碳气运移注入到高烃气藏,提高高烃气藏开发效果的同时间接开发高碳气藏的思路。从室内试验研究、数值模拟研究以及先导区开发效果模拟等多方面对新思路的开发机理及效果进行了深入研究分析,认为开发机理主要是高碳气驱替置换高烃气以提高高烃气采收率和地层束缚水溶解吸收部分高碳气中CO_2从而改善高碳气品质。在南海西部海域莺歌海盆地,通过本文方法开发利用高碳气藏,既可提高高烃气藏的采收率,又可改善部分高碳气品质,最终大部分高碳气仍封存在地下,可以实现经济效益和环境效益的双赢。
There are several high CO_2 content gas reservoirs in the Yinggehai basin in the western South China Sea,and the CO_2 produced with the conventional development method has only limited economic value and is harmful to the environment.A new idea was proposed to establish a migration pathway between high CO_2 gas reservoirs and the developed high hydrocarbon gas reservoirs,and to divert high CO_2 gas into high hydrocarbon gas reservoirs by means of pressure difference between layers,hence improving gas recovery of high hydrocarbon gas reservoirs and simultaneously achieve the indirect development and utilization of high CO_2 gas reservoirs.In this paper,the mechanism and effect of this new development idea were deeply studied and analyzed through lab experimental research,numerical simulation research,and simulation of development effects in pilot area.Research suggests that the development mechanisms mainly include that high CO_2 gas displaces high hydrocarbon gas to improve high hydrocarbon gas recovery,and the formation irreducible water dissolves and absorbs partial CO_2 from high CO_2 gas to improve the quality of high CO_2 gas.This method can not only improve the recovery factor of high hydrocarbon gas reservoirs in the Yinggehai basin in the western South China Sea,but also improve the quality of high CO_2 gas,and finally most of high CO_2 gas is still underground after the development.This method can achieve a win-win situation between economic benefits and environmental benefits.
There are several high CO_2 content gas reservoirs in the Yinggehai basin in the western South China Sea,and the CO_2 produced with the conventional development method has only limited economic value and is harmful to the environment.A new idea was proposed to establish a migration pathway between high CO_2 gas reservoirs and the developed high hydrocarbon gas reservoirs,and to divert high CO_2 gas into high hydrocarbon gas reservoirs by means of pressure difference between layers,hence improving gas recovery of high hydrocarbon gas reservoirs and simultaneously achieve the indirect development and utilization of high CO_2 gas reservoirs.In this paper,the mechanism and effect of this new development idea were deeply studied and analyzed through lab experimental research,numerical simulation research,and simulation of development effects in pilot area.Research suggests that the development mechanisms mainly include that high CO_2 gas displaces high hydrocarbon gas to improve high hydrocarbon gas recovery,and the formation irreducible water dissolves and absorbs partial CO_2 from high CO_2 gas to improve the quality of high CO_2 gas.This method can not only improve the recovery factor of high hydrocarbon gas reservoirs in the Yinggehai basin in the western South China Sea,but also improve the quality of high CO_2 gas,and finally most of high CO_2 gas is still underground after the development.This method can achieve a win-win situation between economic benefits and environmental benefits.
引文
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[4]丁克文,梁斌,马时刚.海上油田自流注水技术应用研究[J].重庆科技学院学报(自然科学版),2012,14(6):73-75.DING Kewen,LIANG Bin,MA Shigang.Application research of artesian water injection technology in offshore oilfield[J].Journal of Chongqing University of Science and Technology(Natural Science Edition),2012,14(6):73-75.
[5]苏海洋,穆龙新,韩海英,等.油藏自流注水开发机理及影响因素分析[J].石油勘探与开发,2015,42(5):632-637.SU Haiyang,MU Longxin,HAN Haiying,et al.Development mechanisms and influencing factors of dump flooding[J].Petroleum Exploration and Development,2015,42(5):632-637.
[6]付晓泰,王振平,卢双舫,等.天然气在盐溶液中的溶解机理及溶解度方程[J].石油学报,2000,21(3):89-94.FU Xiaotai,WANG Zhenping,LU Shuangfang,et al.Mechanism of natural gas dissolving in brines and the dissolving equation[J].Acta Petrolei Sinica,2000,21(3):89-94.
[7]范泓澈,黄志龙,袁剑,等.高温高压条件下甲烷和二氧化碳溶解度试验[J].中国石油大学学报(自然科学版),2011,35(2):7-11.FAN Hongche,HUANG Zhilong,YUAN Jian,et al.Experiment on solubility of CH4and CO2at high temperature and high pressure[J].Journal of China University of Petroleum(Edition of Natural Science),2011,35(2):7-11.
[8] S?REIDE I,WHITSON C H.Peng-Robinson predictions for hydrocarbons,CO2,N2,and H2S with pure water and NaCL brine[J].Fluid Phase Equilibria,1992,77:217-240.