基于组分模拟的油藏CO2固存与CO2提高采收率综合研究

Mohammad Amirul Islam, A. Woobaidullah
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目前,研究人员正在开展广泛的研究工作,以增加石油和天然气产量,以满足日益增长的能源需求,并减少大气中的二氧化碳浓度,以减少全球变暖。本研究旨在通过CO2- eor提高Surma盆地某油藏的产油量,并评估该油藏作为CO2封存的候选油藏。储层岩石为布班砂岩,流体为稠油。油藏中也存在高矿化度水。为此,建立了储层模拟模型。采用块心几何构造了三维地元胞储层网格结构。利用布班砂岩的岩石性质对储层岩石的孔隙度、绝对渗透率和净总比等进行了建模。用液相色谱仪测定了储层油的成分。储层油中纯组分的热力学性质已纳入储层成分模拟模型。通过在储层外围布置4口注二氧化碳井和在储层中心保留1口采油井对储层进行开发。在3100 psi压力下,单井的最佳CO2注入速率为500 MSCF/D,最佳产油量为4900 STB/D。达卡大学学报(自然科学版),70(2):23- 28,2022 (7)
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Integrated Study of CO2 Sequestration and CO2-EOR in Oil Reservoir by Compositional Simulation
Now researchers are performing extensive research work to increase the oil and gas production to meet increasing energy demand and to reduce the CO2concentration from atmosphere to reduce global worming.This study is an effort to increase oil production by CO2-EOR from an oil reservoir in Surma basin and to evaluate the oil reservoir as a candidate of CO2 sequestration. The oil reservoir rock is Bhuban sandstone and fluid is heavy oil. High salinity water is also present in the oil reservoir. A compositional reservoir simulation model has been developed for this study. Geo-cellular 3D reservoir grid structure has been constructed by block centered geometry. Reservoir rock properties such as porosity, absolute permeability and net to gross ratio have been modeled using rock properties of Bhuban sandstone. Reservoir oil composition has been determined from liquid chromatograph. Thermodynamic properties of pure components in reservoir oil have been included in the compositional reservoir simulation model. The reservoir has been developed by four CO2 injection wells arranged at the periphery of the reservoir and one oil production well kept at the center of the reservoir. The optimum CO2 injection rate is 500 MSCF/D at pressure 3100 psi by a single well and optimum oil production rate is 4900 STB/D. Dhaka Univ. J. Sci. 70(2): 23-28, 2022 (July)
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