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首页> 外文期刊>Journal of Petroleum Science & Engineering >Produced water re-injection with seawater treated by sulphate reduction plant: Injectivity decline, analytical model
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Produced water re-injection with seawater treated by sulphate reduction plant: Injectivity decline, analytical model

机译：用硫酸盐还原厂处理过的海水再注入生产水：注入量下降，分析模型

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摘要

Commingled injection of seawater with produced water is an option for offshore fields submitted to waterflooding. It resolves the problems of produced water disposal and of the reservoir pressure maintenance. The presence of barium (strontium) in the formation water and consequent sulphate scaling with seawater flooding is a wide spread phenomenon. In this case, the produced water also contains some barium, which results in sulphate scaling in injection well during commingled injection with seawater.One of the ways around to avoid injectivity damage during the commingled injection of incompatible waters is using a sulphate reduction plant Being mounted on sea platform, the plant significantly reduces sulphate concentration in seawater and allows using it for commingled produced water re-injection (PWRI). Low sulphate seawater injection together with PWRI causes low injectivity decline and makes it feasible to apply in offshore waterflood projects.Planning and design of commingled PWRI with low sulphate seawater injection includes choice of the ratio "produced water: seawater", determination of maximum allowed sulphate concentration in seawater after treatment, and injectivity decline prediction. The reliable design and plan is based on mathematical modelling with well-known model coefficients.In the current paper we derive an analytical model for the co-injection of low sulphate seawater with barium-containing produced water. Reagent and deposit concentrations along with the injectivity index are expressed by explicit formulae. It was found out that bulk sulphate deposition occurs in the 10-20 well radius neighbourhood. The injectivity decline is one order of magnitude higher than the productivity decline under similar reservoir conditions. Calculations for sulphate reduction plant have been performed for six fields of Campos Basin (Brazil).
机译：将海水与产出水混合注入是进行注水的近海油田的一种选择。它解决了采出水处理和储层压力维持的问题。地层水中钡（锶）的存在以及随之而来的海水泛滥导致硫酸盐结垢是一种广泛传播的现象。在这种情况下，产出水中还含有一些钡，这会导致在与海水混合注入期间注入井中的硫酸盐结垢。避免混合注入不相容水的过程中注入性受损的一种方法是使用硫酸盐还原装置。在海上平台上，该工厂显着降低了海水中的硫酸盐浓度，并允许将其用于混合的产出水回注（PWRI）。低硫酸盐海水注入与PWRI一起引起的低注入量下降，使其在海上注水项目中的应用变得可行。低硫酸盐海水注入的混合PWRI的规划和设计包括选择“采出水：海水”的比例，确定最大允许硫酸盐含量处理后海水中的浓度，以及注入量下降的预测。可靠的设计和计划是基于具有众所周知的模型系数的数学模型进行的。在本论文中，我们导出了低硫酸盐海水与含钡采出水共同注入的解析模型。试剂和沉积物浓度以及注入指数由明确的公式表示。已经发现，大量的硫酸盐沉积发生在半径为10-20的井附近。在相似的储层条件下，注入量的下降比生产率的下降高一个数量级。对坎波斯盆地（巴西）的六个油田进行了硫酸盐还原厂的计算。

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