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首页> 外文会议>SPE international sympoisum on formation damage control >Iron Release Following Mineral Dissolution Following Scale Inhibitor Application In a North Alaskan Reservoir
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Iron Release Following Mineral Dissolution Following Scale Inhibitor Application In a North Alaskan Reservoir

机译：在北阿拉斯加水库中应用阻垢剂后矿物质溶解后的铁释放

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High levels of dissovled iron present in produced waters have caused concern in a number of wells in North Alaskan Reservoirs. In this paper, two dynamic "reservoir condition" scale inhibitor core flooding experiments have been conducted to simulate scale inhibitor treatments using a pre-selected commercial phosphonate based scale inhibitor. In these floods very high levels of iron were released during the chemical injection and shut-in stages (> 450ppm in solution). Evidence from pre and post treatment SEM analysis revealed that the major cause for the excessive iron release was extensive dissolution of siderite, inducing considerable mechanical weakness of the core, which was particularly evident for core 1, and much less so in core 2. However, although both cores have similar percentages of siderite, it is the textural arrangement, which is of prime importance in relation to formation damage. In core systems where siderite supports many grain contacts any fludi/mineral dissolution reactions will significantly impair mechanical strength (core !), potentially leading to sand production. Where siderite is enclosed within finer carbonate mud lenses, or is not grain supporting, the mechanical damage is much less severe (core 2). Reactiosn of siderite with the core are quite complex. In this paper we demonstrate the formation of an oxidised rim of hematite which surrounds remnant siderite, with voides present between it and the hematite rim.
机译：产水中存在大量的分解铁，引起了北阿拉斯加水库中许多井的关注。在本文中，已经进行了两个动态的“储层条件”阻垢剂岩心驱油实验，以模拟使用预选择的商用膦酸酯基阻垢剂的阻垢剂处理方法。在这些洪水中，在化学注入和关闭阶段会释放出很高水平的铁（溶液中> 450ppm）。处理前后的SEM分析表明，铁过量释放的主要原因是菱铁矿的大量溶解，导致铁心相当大的机械弱点，这在铁心1上尤为明显，而在铁心2上则更为明显。尽管两个岩心的菱铁矿百分比相似，但这是组织结构，这对地层损害至关重要。在菱铁矿支持许多谷物接触的岩心系统中，任何氟/矿物溶解反应都会显着削弱机械强度（岩心！），有可能导致出砂。如果将菱铁矿包封在较细的碳酸盐泥晶中，或者不支撑颗粒，则机械损伤的严重程度要小得多（核心2）。菱铁矿与核的反应相当复杂。在本文中，我们证明了围绕剩余菱铁矿的赤铁矿氧化边缘的形成，在其与赤铁矿边缘之间存在空隙。

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