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Flow Rate Effect on Retrograde Condensate Dropout in Trinidad Gas Reservoirs

机译:流量对特立尼达气藏逆行凝析油漏失的影响

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The gas reserves off the East coast of Trinidad contain a significant proportion of gas condensate fluids. When these fluids are produced to surface, the components can be separated by fractipnation into gas and liquid fractions at the surface facilities. The premium components, propane and butane, generate an additional source of income. However, if the pressure drops to below the dew point in the reservoir, some of the heavier hydrocarbon components will condense and be trapped in situ rather than be produced to surface, with a substantial loss in revenue due to non-production of these components. Reservoir engineers prevent this by maintenance of pressure by gas or water injection, but economic analysis usually shows that, if the oil/gas ratio is less than 50 barrels per million standard cubic feet (scf) of reservoir fluid, pressure depletion is the overall most economical route than any pressure maintenance scheme. This is because the cost of the extra equipment and operation expenses are not recovered by the sale of the produced heavier components. Some of these valuable premium components are then left in the reservoir. All of Trinidad's gas condensate reservoirs are currently produced by pressure depletion, as their oil/gas ratios are significantly less than 50 barrels per million standard cubic feet. However, the volume of condensate production at surface has shown unusual behavior as it is a reversible function of flow rate and not pressure direct. This article provides an insight into the PVT properties of condensate reservoirs relevant to the nature of the behavior of Trinidad's reserves, and considers how a producer may obtain the contracted rates of gas delivery of these high flow rate wells (>100 million scf/day), but still have maximum economic benefits from condensate recovery.
机译:特立尼达东海岸外的天然气储量中含有很大比例的凝析液。当这些流体被生产到地表时,可以通过在地面设施处将其分解为气体和液体馏分而将其分离。优质成分丙烷和丁烷产生额外的收入来源。但是,如果压力降至储层中的露点以下,则一些较重的碳氢化合物组分将凝结并被原位捕集,而不是被开采出来,这是由于不生产这些组分而造成的收入损失。油藏工程师通过注气或注水维持压力来防止这种情况,但是经济分析通常表明,如果油/气比小于百万桶标准立方英尺(scf)储层流体的50桶,则压力损失最大。比任何压力维护方案更经济的途径。这是因为多余的设备成本和运营费用无法通过出售所生产的较重部件来收回。然后将其中一些有价值的优质成分留在水库中。特立尼达的所有凝析气藏目前都是通过压力降低生产的,因为它们的油气比明显低于每百万标准立方英尺50桶。但是,地表冷凝水的产生量表现出不同寻常的行为,因为它是流速的可逆函数,而不是压力直接作用。本文提供了与特立尼达的储层行为性质相关的凝析油藏PVT特性的见解,并考虑了生产者如何获得这些高流量井(> 1亿标准立方英尺/日)的合同输气率。 ,但仍可从冷凝物回收中获得最大的经济利益。

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