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Gas Shut Off Using Foam: The Solution for Unwanted Gas Production?

机译：使用泡沫关闭天然气：产生有害气体的解决方案？

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Gas shut off technology for wells with a high gas/oil ratio isrnextremely valuable to improve oil production and reducernenvironmental pollution. Foam treatments have been appliedrnto reduce unwanted gas inflow. However, results have notrnalways been favorable. This paper presents a field casernsupported by a modeling study of successful foam shut-offrntreatments carried out in the South Chinese Sea. This studyrnshows that the possibility of success of gas-shut-off treatmentsrncan be greatly enhanced by having a good understanding ofrnthe process parameters. In the Champion field, Brunei, anrnincreasing number of oil wells are shut in due to high gas/oilrnratio. In November 1998, three wells were treated with arnsurfactant/polymer (foam) solution in water, co-injected withrnnitrogen. In two wells the gas/oil ratio was substantiallyrnreduced but also a significant loss in oil productivity wasrnobserved, which partly restored in the course of time. Therntreatments were based on laboratory core flow experimentsrnunder reservoir conditions. The experiments served to designrnthe field trials and as input data for simulations with arnnumerical radial well model, which was used to interpret thernfield trials. The reduction in gas mobility by a factor betweenrn2 and 10 as observed in the field is consistent with the resultsrnof the laboratory experiments.rnThe study identifies the permeability and temperature windowrnand the type of geological setting and well configuration forrnwhich the applied foam system will be successful. This isrnessential to screen potential candidate wells. It will be shownrnthat in future treatments less damage to the oil productivityrnand lower costs are possible by omitting nitrogen gas and byrnreducing the injected volumes.
机译：具有高气/油比的井的瓦斯切断技术对于提高石油产量和减少环境污染具有极其重要的意义。已经采用泡沫处理以减少不希望的气体流入。但是，结果并不总是令人满意的。本文介绍了在南中国海成功进行泡沫封闭处理的模拟研究所支持的现场案例。这项研究表明，通过对工艺参数有很好的了解，可以极大地提高成功进行气体切断处理的可能性。在汶莱的冠军油田，由于天然气/油比高，关闭了越来越多的油井。 1998年11月，对三口井进行了表面活性剂/聚合物（泡沫）水溶液与氮气共注入的处理。在两口井中，气/油比显着降低，但石油生产率的显着损失却被消除，随着时间的流逝，部分损失得以恢复。这些处理是基于储层条件下的实验室岩心流动实验。实验用于设计现场试验，并作为使用数值径向井模型进行模拟的输入数据，该模型用于解释现场试验。在野外观察到的气体迁移率降低幅度为rn2到10，这与实验室实验的结果是一致的。这项研究确定了渗透率和温度窗口以及地质条件和井眼构造的类型，从而成功应用了泡沫系统。这对于筛选潜在的候选井至关重要。结果表明，在未来的处理中，通过省略氮气并减少注入量，可以降低对石油生产率的损害，并可以降低成本。

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