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首页> 外文会议>SPE Asia Pacific improved oil recovery conference (APIORC 01) >WAG pilot at VLE field and IOR opportunities for mature fields at Maracaibo Lake
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WAG pilot at VLE field and IOR opportunities for mature fields at Maracaibo Lake

机译：在VLE油田进行WAG试点，在马拉开波湖进行成熟油田的IOR机会

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Light oil fields in Lake Maracaibo have been produced forrnseveral decades under depletion and waterflooding. Due tornreservoir heterogeneity and complexity the traditionalrnwaterflooding oil recovery is not expected to exceed 30% ofrninitial oil in place. Potential Improved Oil Recovery (IOR)rnmethods capable to boost production from the mature fieldsrnare now under investigation and testing by the StaternVenezuelan Oil Company PDVSA. PDVSA’s main IORrntechnology strategy is based on Integrated Field Laboratoryrn(IFL) philosophy. IFL allows concentrating resources onrnmodern technology evaluation, design IOR processes to solvernregional problems, reduce the gap between laboratoryrnscreening and the field application phase for most promisingrnrecovery methods. The Water Alternating Gas (WAG) pilot atrnVLE-305 area of Lagocinco field is one of such IORrnlaboratory fields with the first immiscible gas injection pilot inrnLake Maracaibo started in May 2000. The WAG pilotrnencompasses five production wells, one dual completionrninjection well and one observation well. The producingrnreservoir C-23 is a stratified sandstone with areal and lateralrnheterogeneities. Separator hydrocarbon gas is injected in therndual completion injection well in the WAG mode. Differentrnsensitivity simulations were performed to design and optimizernWAG injection strategy. The WAG pilot is now in its secondrnstage of implementation and evaluation. Simulations arernfocused on tracer modeling and interpretation of productionrnwells response.rnSince available injection volumes of hydrocarbon gas forrnlarge scale WAG injection projects are not available in thernarea, other IOR alternatives are being considered. The VLErnpilot is again used as a laboratory for screening other potentialrnIOR technologies. Nitrogen injection in WAG and continuumrnmode, and cyclic water injection are strategies underrnconsideration.rnNitrogen injection facilities will not be operational in thernnear future, therefore cyclic water injection is considered as anrnalternative for short-term production improvement underrnwaterflooding. Cyclic injection can accelerate oil productionrnand reduce water cut making production more economic andrnnot requiring significant additional investments in the field.rnThe preliminary evaluation of cyclic injection in the pilot arearngives oil production improvement by 2-3%, and expansion ofrnthe process over a larger field area could give additionalrnsweep improvement. WAG injection is estimated to improvernoil recovery by 10-12% of STOOIP. WAG with nitrogen asrninjection gas may give 4-6% of STOOIP in increased oilrnrecovery in comparison with waterflooding.
机译：马拉开波湖的轻质油田在枯竭和注水后已经生产了几十年。由于储层的非均质性和复杂性，传统的注水采油量预计不会超过原始储油量的30％。委内瑞拉国营石油公司PDVSA正在研究和测试能够提高成熟油田产量的潜在提高采收率（IOR）方法。 PDVSA的主要IORrn技术策略是基于Integrated Field Laboratoryrn（IFL）理念。 IFL允许将资源集中在现代技术评估上，设计IOR流程以解决区域问题，缩小实验室筛选与现场应用阶段之间的差距，以实现最有希望的回收方法。 Lagocinco油田的VLE-305区域的水交替气（WAG）试点就是这样的IORrnlaboratory领域之一，首个不混溶气体注入试点in马拉开波湖于2000年5月开始。WAG试点包括5口生产井，1口双完井和1口观察井。 。 C-23储层为层状砂岩，具有区域和横向非均质性。分离器烃气以WAG模式注入双完井注入井。进行了不同的灵敏度模拟，以设计和优化WAG注射策略。 WAG试点现在处于实施和评估的第二阶段。模拟主要集中在示踪剂建模和对生产井响应的解释上。由于在热那亚没有大型WAG注入项目可用的烃气注入量，因此正在考虑其他IOR替代方案。 VLErnpilot再次用作筛选其他潜在的IOR技术的实验室。在WAG和连续介质模式下注氮以及循环注水是目前尚未考虑的策略。注氮设施在不久的将来将无法运行，因此循环注水被认为是注水后短期内提高产量的替代方法。循环注入可以加快石油生产，减少含水量，使生产更加经济，并且不需要在该领域进行大量额外的投资。rn在中试区域对循环注入进行的初步评估可以使石油产量提高2-3％，并在更大的油田范围内扩大工艺可以进一步改善扫描效果。估计WAG注射可将腈的回收率提高STOOIP的10-12％。与注水相比，含氮注气的WAG可使回采率提高4-6％。

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