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高温气藏近井带地层水蒸发和盐析研究
引用本文:汤勇, 杜志敏 张哨楠 孙雷 孙良田.高温气藏近井带地层水蒸发和盐析研究[J].西南石油大学学报(自然科学版),2007,29(2):96-99.
作者姓名:汤勇   杜志敏 张哨楠 孙雷 孙良田
作者单位:(1.成都理工大学,四川 成都 610059; 2.“油气藏地质及开发工程”国家重点实验室·西南石油大学,四川 成都 610500)
摘    要:通过PR状态方程与超额自由能HV混合规则的结合,建立了适于含极性物质水的烃类混合物气液液三相相平衡理论计算模型。同时建立了地层水蒸发与近井带含水饱和度与地层水矿化度的函数关系。运用相平衡理论,研究了地层水烃类体系随温度压力条件改变的相体积变化规律。结合单井径向数值模拟模型,研究了实例气井生产过程中气态水含量Xw、储层含水饱和度Sw以及地层水矿化度随半径和生产时间的变化规律。研究结果显示,近井带压降梯度大,地层水蒸发显著,气态凝析水含量呈指数增加,低压下可超过7%。地层水的蒸发可使得近井含水饱和度降低超过50%,有利于提高气井产能;地层水蒸发会使得矿化度升高而导致盐析,盐析往往发生在近井5m范围内。

关 键 词:高温  气藏  地层水  蒸发  盐析  
收稿时间:2006-06-30

FORMATION WATER VAPORIZATION AND SALT OUT AT NEAR WELL BORE ZONE IN HIGH TEMPERATURE GAS RESERVOIRS
TANG Yong,DU Zhi-min ZHANG Shao-nan et al..FORMATION WATER VAPORIZATION AND SALT OUT AT NEAR WELL BORE ZONE IN HIGH TEMPERATURE GAS RESERVOIRS[J].Journal of Southwest Petroleum University(Seience & Technology Edition),2007,29(2):96-99.
Authors:TANG Yong  DU Zhi-min ZHANG Shao-nan
Institution:(Chengdu University of Technology, Chengdu Sichuan 610059, China)
Abstract:A gasliquidgas phase equilibrium theoretical calculation model suitable for hydrocarbon mixtures contained polar material water is presented based on PR equation of state and excess energy HV mixing rule. Moreover, a functional relation between formation water evaporation, water saturation at near well bore zone and salinity is set up using this equilibrium theory, the change of phase volume of hydrocarbon and water with temperature and pressure is studied. Through combining with single well radial numerical simulator, the change of vaporous water content Xw, water saturation Sw and water salinity versus radius and production time are investigated. The results show that at near well bore zone, the pressure drop gradient decreases considerablly, formation water vaporizes prominently, and the Xw increases exponentially which can even exceed 7 percent at low pressure. It also proved that the formation water saturation Sw may decrease by 50 percent after vaporization, which is in favor of production. In addition, formation water vaporization would result in salinity increasing, which may lead to salt out and the salt out generally occurs about 5 meters range around well bore.
Keywords:high temperature  gas reservoir  formation water  vaporization  salt out  
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