气田采出水复合除铁、除钙工艺

doi:10.16085/j.issn.1000-6613.2020-1296

化工进展 ›› 2021, Vol. 40 ›› Issue (6): 3091-3098.DOI: 10.16085/j.issn.1000-6613.2020-1296

气田采出水复合除铁、除钙工艺

张翱¹(), 房建宇², 刘博¹, 赵轩刚³, 黄力¹, 黄鹤¹, 冉良涛¹, 苏碧云¹()

^1.西安石油大学化学化工学院，陕西西安 710065
^2.中国石油长庆油田公司第二采气厂米脂天然气处理厂，陕西米脂719000
^3.中国石油长庆油田公司第二采气厂采气工艺研究所, 陕西榆林 719000

收稿日期:2020-07-09 修回日期:2020-09-09 出版日期:2021-06-06 发布日期:2021-06-22
通讯作者: 苏碧云
作者简介:张翱（1995—），男，硕士研究生，研究方向为油田污水及污泥“三化”处理。E-mail：1610706464@qq.com。
基金资助:
国家自然科学基金(51674200);陕西省自然科学基础研究计划(2019JM-421);西安石油大学青年科研创新团队项目(2019QNKYCXTD16);西安市科技创新项目(2020KJRC0099);西安石油大学研究生创新与实践项目(YCS19213129)

Composite removal of iron and calcium technology for gas field produced water

ZHANG Ao¹(), FANG Jianyu², LIU Bo¹, ZHAO Xuangang³, HUANG Li¹, HUANG He¹, RAN Liangtao¹, SU Biyun¹()

^1.College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, China
^2.Mizhi Natural Gas Treatment Plant, Second Gas Production Plant, Changqing Oilfield Company, PetroChina, Mizhi 719000, Shaanxi, China
^3.Gas Production Technology Research Institute, Second Gas Production Plant, Changqing Oilfield Company, PetroChina, Yulin 719000, Shaanxi, China

Received:2020-07-09 Revised:2020-09-09 Online:2021-06-06 Published:2021-06-22
Contact: SU Biyun

摘要/Abstract

摘要：

由预处理环节水质及精馏塔垢分析可知，管线堵塞的主要原因是含铁、含钙量严重超标，导致结垢物堆积在输水设备及管线内部，同时引起垢下腐蚀，影响气田采出水处理设备的正常运行。鉴于绝大多数处理厂仅考虑铁离子的去除，而未考虑Ca²⁺的去除，本文首次在采出水预处理环节对除铁和除钙工艺进行复合，通过筛选适宜的除铁除钙剂，优化加药顺序、加药反应时间、静置时间等参数，开发出适用于气田采出水处理的复合除铁除钙工艺。结果表明，现场加药量为H₂O₂ 500mg/L、NaOH 500mg/L、PAC 50mg/L、PAM 4mg/L，除钙剂与Ca²⁺的摩尔比为1∶1，加药顺序为Na₂CO₃→H₂O₂→NaOH→PAC→PAM，反应时间7min以上，静置5h以上时，气田采出水中的总铁离子含量可由153.24mg/L降至0.3338mg/L，Ca²⁺由5495mg/L降至520mg/L，其中总铁离子降幅为99.8%，Ca²⁺降低了90.54%，矿化度大幅度降低可避免后续环节堵塞，从而保障气田采出水处理系统高效运行。

关键词: 腐蚀, 结垢, 优化, 气田采出水, 复合除铁除钙

Abstract:

According to the analysis of water quality and scale deposits of distillation tower in the pretreatment process, the iron and calcium content exceed the standard, which leads to the accumulation of scale in water conveyance equipment and pipeline and the corrosion under the scale at the same time, which affects the normal operation of the produced water treatment equipment in the gas field. Considering that the majority of treatment plants only consider removing iron ions, but do not consider removing Ca²⁺, this paper combines the removal technology of iron and Ca²⁺ in the produced water pretreatment for the first time, and optimized addition sequence, reaction time, standing time by selecting suitable iron and calcium removal agents. The composite iron and calcium removal technology suitable for gas field produced water treatment has been developed. The results showed that the on-site dosage was H₂O₂ 500mg/L, NaOH 500mg/L, PAC 50mg/L, PAM 4mg/L, the molar ratio of calcium removal to Ca²⁺ was 1∶1. The order of the agents was Na₂CO₃→H₂O₂→NaOH→PAC→PAM. The reaction time was more than 7min. The standing time was more than 5h. The total iron ion content in the produced water of the gas field can be reduced from 153.24mg/L to 0.3338mg/L, Ca²⁺ from 5495mg/L to 520mg/L, of which iron ion decreases by 99.8%, Ca²⁺decreases by 90.54%. Salinity substantial reduction can avoid blockage, thereby ensure the efficient operation of the gas field produced water treatment system.

Key words: corrosion, fouling, optimization, gas field produced water, composite removal of iron and calcium

中图分类号:

TE992

张翱, 房建宇, 刘博, 赵轩刚, 黄力, 黄鹤, 冉良涛, 苏碧云. 气田采出水复合除铁、除钙工艺[J]. 化工进展, 2021, 40(6): 3091-3098.

ZHANG Ao, FANG Jianyu, LIU Bo, ZHAO Xuangang, HUANG Li, HUANG He, RAN Liangtao, SU Biyun. Composite removal of iron and calcium technology for gas field produced water[J]. Chemical Industry and Engineering Progress, 2021, 40(6): 3091-3098.

图/表 13

参考文献 14

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元素	质量分数/%		原子分数/%
元素	局部003	局部004	局部003	局部004
C	11.26	7.18	19.26	16.73
O	48.00	26.82	61.61	46.92
Si	0.00	0.34	0.00	0.34
P	0.45	0.58	0.30	0.53
S	0.00	0.27	0.00	0.24
Ca	30.43	16.74	15.59	11.69
Fe	8.10	46.28	2.98	23.19
Ba	1.77	1.79	0.26	0.36

元素	质量分数/%		原子分数/%
元素	局部003	局部004	局部003	局部004
C	11.26	7.18	19.26	16.73
O	48.00	26.82	61.61	46.92
Si	0.00	0.34	0.00	0.34
P	0.45	0.58	0.30	0.53
S	0.00	0.27	0.00	0.24
Ca	30.43	16.74	15.59	11.69
Fe	8.10	46.28	2.98	23.19
Ba	1.77	1.79	0.26	0.36

矿物名称及化学式	矿物质量分数/%
方解石CaCO₃	86
赤铁矿Fe₂O₃	3
文石CaCO₃	3
磁铁矿Fe₃O₄	3
针铁矿FeO（OH）	1
菱铁矿FeCO₃	4

矿物名称及化学式	矿物质量分数/%
方解石CaCO₃	86
赤铁矿Fe₂O₃	3
文石CaCO₃	3
磁铁矿Fe₃O₄	3
针铁矿FeO（OH）	1
菱铁矿FeCO₃	4

取样点	Ca²⁺含量/mg·L^-1	Fe²⁺含量/mg·L^-1	Fe³⁺含量/mg·L^-1	pH	悬浮物/mg·L^-1	含油量/mg·L^-1	总矿化度/mg·L^-1	水型
卸车池	5495	120.4	32.8	7.64	670	310.8	25656	CaCl₂
污水调节罐	5318	56.1	27.4	6.68	610	298.4	26370	CaCl₂
中间罐	4018	34.2	41.1	6.87	750	228.7	24883	CaCl₂
粗过滤器	4475	33.3	40.6	7.20	775	286.1	25409	CaCl₂
精细过滤器	4204	15.1	40.1	7.20	430	152.7	23208	CaCl₂

气田采出水复合除铁、除钙工艺

Composite removal of iron and calcium technology for gas field produced water

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