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塔河油田污水系统碳酸钙垢除垢实验研究

2021-08-19汪昊刘金海熊明林

汪昊 刘金海 熊明林

【摘  要】塔河油田污水矿化度较高,污水处理设备及管道结垢严重,为油田生产安全带来严峻挑战。为此,论文针对塔河油田垢样,评价不同类型除垢剂的除垢效果,研究除垢辅剂、温度、时间等对除垢效率的影响规律。结果表明,质量分数为5%的氨基磺酸作为主剂与质量分数为1%的聚天冬氨酸(PTSA)作为辅剂以及余量的水进行复配对塔河油田垢样除垢效率最佳;除垢率随温度的升高以及反应时间的延长而增大,最佳除垢条件为反应时间9h,反应温度60℃,相关研究成果为塔河油田的除垢提供了理论支持。

【Abstract】The salinity of sewage in Tahe Oilfield is high, and the sewage treatment equipment and pipelines are seriously scaling, which brings serious challenges to the production safety of the oilfield. Therefore, the paper evaluates the descaling effect of different types of descaling agents according to the scale sample of Tahe Oilfield, and studies the influence law of descaling efficiency such as descaling auxiliary agent, temperature and time. The results show that the best descaling efficiency is achieved by the combination of 5% mass fraction of sulfamic acid as the main agent, 1% mass fraction of polyaspartic acid (PTSA) as an auxiliary agent and the remaining amount of water. The descaling rate increases with the improvement of temperature and the increase of reaction time. The best descaling condition is the reaction time of 9h and the reaction temperature of 60℃. The relevant research results of the paper provide theoretical support for descaling in Tahe Oilfield.

【关键词】塔河油田;除垢剂;碳酸钙垢

【Keywords】Tahe Oilfield; descaling agent; calcium carbonate scale

【中图分类号】TE358                                             【文獻标志码】A                                                 【文章编号】1673-1069(2021)09-0176-03

1 引言

地层油井及集输系统结垢是我国油田生产面临的普遍问题。随着油田开采进入中后期,原油含水量和采出水矿化度急剧升高(平均为2×105mg/L),致使集输系统面临的结垢问题更加严重,甚至出现管道堵塞、卡泵等事故,为油田生产带来严峻安全挑战以及经济损失。

针对油田集输管道日益严重的结垢问题,目前国内外学者开展了大量研究,提出了一系列除垢方法,如物理除垢法和添加化学试剂除垢法等。化学除垢法因其经济高效的特点受到学者们的高度关注,常见的有络合剂除垢和酸法除垢等。其中,络合剂除垢是指通过络离子与钙离子之间反应生成更为稳定且溶于水的络合物达到除垢的目的,常见的络合剂有乙二胺四乙酸(EDTA)、乙二胺四乙酸二钠(EDTA-2Na)、羟基亚乙基二磷酸(HEDP)、二乙烯三胺五乙酸(DTPA)等。……

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