摘要
气顶油藏型地下储气库建设及运行在我国刚刚起步,尚缺乏现场实用的运行注采动态分析与预测方法。为此,根据气顶注采气过程中气相与油相的压力响应特征,引入了周期可变动用剩余油量与地层压力的关系,真实还原了剩余油量在注采气过程中对地下储气库运行的影响,建立了周期注采气动态预测数学模型,得到了一个完整注采周期内气顶自由气、地层剩余油的动用量以及与之相对应的库容参数预测指标。实例计算结果表明:(1)一方面,周期可动用剩余油量对气顶自由气动用量的影响不能忽略,可动剩余油的弹性作用使气顶内部压力响应特征产生了较为复杂的改变,有可能导致气顶油藏型地下储气库建库周期较气藏型地下储气库长;(2)另一方面,随着注采周期的延长,储气库内动用自由气、剩余油的动用量逐步增长,但趋势渐缓,从而使注入气向剩余油溶解扩散造成的损耗气量始终保持在较低水平,不会对储气库的稳定运行造成负面影响。
In China, underground gas storages（UGSs） rebuilt from gas-cap oil reservoirs are currently at their beginning stage of construction and operation, so there is no injection-withdrawal performance analysis and prediction method available for field application. Based on the pressure response features of gas and oil phases in the process of gas-cap injection and production, the relationship between the cyclic variable movable remaining oil and the reservoir pressure was introduced to reproduce the effect of remaining oil on UGS performance during its operation. Then, a mathematical model was established to predict cyclic gas injection-withdrawal performance. And finally, the following parameters were obtained for one complete gas injection-withdrawal period, including the free gas in the gas cap, the movable remaining oil and the corresponding storage capacity parameter prediction index. It is shown from case studies that the effect of the cyclic movable remaining oil on the produced free gas of the gas cap should not be neglected and its elastic action causing complex alterations in the pressure response features within the gas cap may lead to a longer ramp-up period in gas-cap reservoir UGS than that in gas reservoir UGS. Besides, the produced free gas and the movable remaining oil in the storage increase gradually with the proceeding of injection-withdrawal operation, but the increasing rate declines steadily. As a result, less injected gas is dissolved and diffused into the remaining oil, so the steady operation of the underground gas storage is not adversely influenced.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2016年第7期88-92,共5页
Natural Gas Industry
基金
中国石油天然气集团公司储气库重大专项"地下储气库地质与气藏工程关键技术研究与应用"(编号:2015E4002)
关键词
气顶油藏
地下储气库
注采
压力响应特征
可动用剩余油库容
参数预测
动态预测
Gas-cap reservoir
Underground gas storage（UGS）
Injection-withdrawal
Pressure response features
Movable remaining oil storage capacity
Parameter prediction
Performance prediction
作者简介
王皆明，1969年生，高级工程师，博士；主要从事储气库建库设计及运行方面的研究工作。地址：（065007）河北省廊坊市44号信箱。电话：（010）69213070。ORCID：0000-0003-2725-4257。E-mail：jieming@petrochina．com．cn
