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首页> 外文会议>SPE Asia Pacific improved oil recovery conference (APIORC 01) >EOR Possibilities for Development of a Mature Light-Oil Reservoir in Oman
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EOR Possibilities for Development of a Mature Light-Oil Reservoir in Oman

机译：在阿曼开发成熟的轻油储层的提高采收率的可能性

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摘要

This paper presents the development plan using EORrntechniques for a sandstone reservoir containing very light oilrn(45 oAPI, 0.5 cP at reservoir conditions) located in Oman.rnDue to low permeability (0.1 to 5 mD) of the upper part of thernreservoir (Upper Haushi Sand, UHS), recovery factor wasrnvery low. However, original oil in place is quite significant inrnthis formation and EOR application was targeted to increasernthe recovery factor. On the other hand, reservoir pressure isrnstill high due to strong aquifer support. Another zone of highrnpermeability (100-300 mD, Sand Drain, SD) has been wateredrnout by the strong aquifer influx. Being operated by a smallrnsize oil company, the main concern was the economics -rncapital and operating expenditures. After a screening processrnthe optimum solution was found to be nitrogen injection tornovercome the low injectivity. The low viscosity of oil andrnrelatively low cost of injectant also make the injection ofrnnitrogen a favorable application.rnThe response of the two formations (UHS and SD) tornnitrogen injection was tested in laboratory by injectingrnnitrogen into oil saturated core samples. The recoveryrnobtained by immiscible displacement of oil was as high as 40rn% in the tight UHS. Similarly, tests were carried out tornunderstand the response of nitrogen injection into alreadyrnwaterflooded high permeability SD zone. The recovery wasrnfound to be 5 to 10 % after 75 % waterflood recovery. Next,rnthe nitrogen injection performance was studied using a fullscalernfield simulator. After obtaining a history match, thernoption of using abandoned downdip wells as injectors and thernupdip wells as producers were evaluated. Relativernpermeability curves generated using the laboratory tests werernapplied and different injection scenarios were tested through arnseries of simulation runs. Also, the possibilities of injecting air without purifying from the oxygen were discussed from therneconomical, technical, additional oil recovery and safetyrnpoints of view.
机译：本文提出了使用EORrntechniques技术开发位于阿曼的含轻油（45 oAPI，储层条件下为0.5 cP）的砂岩油藏的开发计划。由于储层上部（豪士沙上部）的低渗透性（0.1至5 mD） ，UHS），恢复因子非常低。但是，在该地层中，原始油就很重要，而EOR的应用旨在提高采收率。另一方面，由于强大的含水层支撑，储层压力仍然很高。另一个高渗透率区域（SD-Sand Drain，100-300 mD）已被强烈的含水层涌入淹没。由一家小型石油公司经营，主要关注的是经济方面的资本和运营支出。在筛选过程之后，发现最佳的解决方案是注入氮气以克服低注入能力。油的低粘度和相对较低的注入剂成本也使氮的注入成为有利的应用。在实验室中，通过向油饱和岩心样品中注入氮，测试了两种地层（UHS和SD）对注入氮的响应。在致密的UHS中，通过不混溶驱油获得的采收率高达40％。同样，进行了测试，以了解向已注水的高渗透率SD区注氮的响应。在注水率达到75％之后，发现恢复率为5％至10％。接下来，使用全标度场模拟器研究了氮气注入性能。在获得历史匹配之后，评估了使用废弃的下倾井作为注入器和使用下倾井作为生产者的选择。应用了通过实验室测试生成的相对渗透率曲线，并通过一系列模拟运行测试了不同的注入场景。同样，从经济，技术，额外的油回收和安全性的角度讨论了在不从氧气中净化的情况下注入空气的可能性。

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