Influencing Factors and Critical Salt-Precipitation Model for High-Salinity Produced Water of Mabei Oilfield

doi:10.12388/j.issn.1673-2677.2026.02.012

Abstract

Abstract:

High-salinity produced water is prone to salt precipitation in the gathering and transportation process of oilfields，which affects pipeline transportation safety and system stability. To address salt precipitation in produced water from a high-salinity and high-alkali reservoir in Mabei Oilfield，this study conducted experiments on salt precipitation factors，single-salt critical salinity，and mixed-salt cooperative precipitation experiments，based on produced-water property testing and water-chemistry analysis. The results showed that the salinity of the aqueous phase from Mabei Oilfield is approximately （2.5-3.0）×10⁴ mg/L. The produced water is of the sodium bicarbonate type，and the main ions are Na⁺，CO2-3 ，HCO-3，and Cl^-. The system basically reaches salt precipitation equilibrium after 20 min of cooling. Sand content of 1%-5% and oil content of 0%-40% have little effects on the critical salt precipitation salinity of the free water phase. The critical salinity of NaCl changes only slightly with temperature，whereas Na₂CO₃ is the most temperature-sensitive salt and is an important driver for salt precipitation. The critical salinity of the NaCl-Na₂CO₃-NaHCO₃ mixed-salt system generally grows with increasing temperature and is significantly affected by salt proportions. A cooperative mixed-salt precipitation model was further established. After interactive correction，the mean absolute error for the D-M mixed-salt system decreased from 10.68% to 6.76%，indicating that the critical salt precipitation salinity of the mixed-salt system is controlled by the Na⁺ common-ion effect，carbonate equilibrium transformation，and high-ionic-strength coupling. The findings of this study provide a theoretical basis for salt precipitation risk prediction and process optimization for the gathering and transportation of high-salinity and high-alkali produced water in Mabei Oilfield.

Key words:

high-salinity produced water, aqueous-phase composition, salt precipitation behavior, critical salinity, salt precipitation model

摘要：

高矿化度采出液在油气田集输过程中易发生盐析沉积，影响管道输送安全与系统稳定性。针对玛北高盐高碱油藏采出液盐析问题，基于采出液物性测试与水化学分析结果，开展盐析影响因素、单盐临界矿化度及复盐协同盐析实验研究。结果表明：玛北采出液水相矿化度约为（2.5~3.0）×10⁴ mg/L，水型为重碳酸钠型，主要离子为Na⁺、CO2-3 、HCO-3和Cl^-。降温约20 min后体系基本达到盐析平衡；含砂量1%~5%、含油量0%~40%对游离水相临界矿化度影响较小。NaCl临界矿化度随温度变化较小，Na₂CO₃对温度最敏感，是引发盐析的重要因素。NaCl-Na₂CO₃-NaHCO₃复配体系临界矿化度随温度升高整体增大，且受盐类配比显著影响。进一步建立复盐协同临界盐析模型，交互修正后D~M复配体系平均绝对误差由10.68%降至6.76%，表明复盐体系临界矿化度受Na⁺共同离子效应、碳酸盐平衡转化和高离子强度耦合作用控制。研究结果可为玛北高盐高碱采出液集输过程中盐析风险预测与工艺优化提供理论依据。

关键词:

高含盐采出液, 水相组成, 盐析行为, 临界矿化度, 盐析模型

CLC Number:

TE357.6 ','1');return false;" target="_blank">
TE357.6

XIONG Xiaoqin, HUANG Hong, YIN Jinghui, ZHOU Jiahao.

Influencing Factors and Critical Salt-Precipitation Model for High-Salinity Produced Water of Mabei Oilfield

[J]. Xinjiang Oil & Gas, 2026, 22(2): 116-124.

熊小琴, 黄鸿, 尹景慧, 周家豪.

玛北高含盐采出液盐析影响因素及临界盐析模型

[J]. 新疆石油天然气, 2026, 22(2): 116-124.

References

［1］刘倩，彭素芹，梁昌晶，等. 油田水结垢预测技术研究进展［J］. 石油管材与仪器，2020（3）：1-5.LIU Qian，PENG Suqin，LIANG Changjing，et al. Progress on prediction model of oil field water scaling［J］. Petroleum Tubular Goods & Instruments，2020（3）：1-5.

［2］YAN Y，YU T，SONG J，et al. A review of prediction methods for oilfield produced water scaling［C］//IOP Conference Series：Earth and Environmental Science，IOP Publishing，2021，651（3）：032052.

［3］HU Y，LV M. Research on prediction model of scaling in ASP flooding based on data mining［J］. Journal of Computational Methods in Sciences and Engineering，2023，23（6）：3037-3054.

［4］GHALIB H B，AL-HAWASH A B，MUTTASHAR W R，et al. Determining the effect of mineral scaling formation under different injection water sources on the performance of Mishrif carbonate reservoir in Halfaya Oilfield，Southern Iraq［J］. Journal of Petroleum Exploration and Production Technology，2023，13（5）：1265-1282.

［5］GRUSZKA M，NAGY S. Precipitation of barium sulphate during the waterflooding process in Polish offshore oilfields：Case analysis［J］. Energies，2023，16（8）：3345.

［6］AMAKIRI K T，CANON A R，MOLINARI M，et al. Review of oilfield produced water treatment technologies［J］. Chemosphere，2022，298：134064.

［7］张敏霞，刘涛，安明明，等. 油田采出水中油滴的聚结技术与设备［J］. 工业水处理，2022，42（3）：33-40.ZHANG Minxia，LIU Tao，AN Mingming，et al. Coalescence technology and equipment of oil droplets in oil field produced water［J］. Industrial Water Treatment，2022，42（3）：33-40.

［8］WANG B，XIONG M Y，WANG P，et al. Chemical characterization in hydraulic fracturing flowback and produced water of shale gas in Sichuan of China［J］. Environmental Science and Pollution Research，2020，27（21）：26532-26542.

［9］GAO J，ZOU C，LI W，et al. Hydrochemistry of flowback water from Changning shale gas field and associated shallow groundwater in Southern Sichuan Basin，China：implications for the possible impact of shale gas development on groundwater quality［J］. Science of the Total Environment，2020，713：136591.

［10］ZHANG Y，YANG K，DONG Y，et al. Chemical characterization of non-volatile dissolved organic matter from oilfield-produced brines in the Nanyishan area of the western Qaidam Basin，China［J］. Chemosphere，2021，268：128804.

［11］刘拯君，张衍君，廖婉蓉，等. 页岩储层盐离子扩散规律及其在压裂缝网诊断中的应用［J］. 新疆石油天然气，2025，21（1）：41-49.LIU Zhengjun，ZHANG Yanjun，LIAO Wanrong，et al. The diffusion law of salt ions in shale reservoirs and its application in hydraulic fracture network diagnostics［J］. Xinjiang Oil & Gas，2025，21（1）：41-49.

［12］黄贤斌，张学皓，袁侦航，等. 复杂泥页岩地层井壁稳定钻井液材料研究现状［J］. 新疆石油天然气，2024，20（3）：46-53.HUANG Xianbin，ZHANG Xuehao，YUAN Zhenhang，et al. Research status of wellbore stabilization drilling fluid materials in complex shale formations［J］. Xinjiang Oil & Gas，2024，20（3）：46-53.

［13］YE H，CHEN L，KOU Y，et al. Influences of coagulation pretreatment on the characteristics of crude oil electric desalting wastewaters［J］. Chemosphere，2021，264：128531.

［14］AHMAD F，MORRIS K，LAW G T W，et al. Fate of radium on the discharge of oil and gas produced water to the marine environment［J］. Chemosphere，2021，273：129550.

［15］KLEMZ A C，WESCHENFELDER S E，DE CARVALHO NETO S L，et al. Oilfield produced water treatment by liquid-liquid extraction：a review［J］. Journal of Petroleum Science and Engineering，2021，199：108282.

［16］MOHAMMED I，SVENNINGSEN S W，KAMOUNAH F S，et al. Calcium sulfate scale：a review of state-of-the-art［J］. Geoenergy Science and Engineering，2024，242：213228.

［17］PEIPER J C，PITZER K S. Thermodynamics of aqueous carbonate solutions including mixtures of sodium carbonate，bicarbonate，and chloride［J］. The Journal of Chemical Thermodynamics，1982，14：613-638.

［18］HARVIE C E，MØLLER N，WEARE J H. The prediction of mineral solubilities in natural waters：the Na-K-Mg-Ca-H-Cl-SO₄-OH-HCO₃-CO₃-CO₂-H₂O system to high ionic strengths at 25 ℃［J］. Geochimica et Cosmochimica Acta，1984，48（4）：723-751.

［19］JAWORSKI Z，CZERNUSZEWICZ M. Liquid-solid equilibrium for the NaCl-NaHCO₃-Na₂CO₃-H₂O system at 45 ℃：Validation of mixed solvent electrolyte model［J］. Chemical Papers，2013，67（9）：1181-1187.

［20］ZHANG X，LI Z. Solubility and modeling for NaHCO₃ and NH₄HCO₃ crystals in the system Na⁺-NH₄⁺-SO₄^2--Cl^--H₂O from 283.15 to 323.15 K［J］. Journal of Chemical & Engineering Data，2020，65（2）：664-677.

［21］CAO J，REN Y，YU B，et al. Solid-liquid phase equilibria of quaternary systems Na⁺//Cl^-，CO₃^2-，SO₄^2--H₂O and Na⁺//Cl^-，CO₃^2-，NO₃^--H₂O at T=313.15 K［J］. The Journal of Chemical Thermodynamics，2020，142：106028.

［22］GE S Y，ZHU L，MA Y L，et al. Solid-liquid stable phase equilibria of the quaternary system Na⁺//Cl^-，SO₄^2-，CO₃^2--H₂O and its subsystems at 353.15 K［J］. The Journal of Chemical Thermodynamics，2020，143：106015.

［23］SONG X，MA J，MENG L，et al. Solubility determination and thermodynamic modeling of solid-liquid equilibria in the quaternary system NaCl-Na₂SO₄-NaHCO₃-H₂O at 323.15 K［J］. Journal of Chemical & Engineering Data，2022，67（10）：3290-3298.

［24］WU J，WU Z，LIU J. Solid-liquid phase equilibria in the quinary system NaCl+NaOH+Na₂CO₃+Na₂SO₄+H₂O at 363.15 K［J］. ACS Omega，2020，5（17）：10133-10144.

［25］TURSUNBADALOV S，SILLANPAA M. Phase relations in the Na，K//Cl，SO₄，CO₃-H₂O quinary system at 35°C［J］. ACS Omega，2021，6（51）：35718-35726.

［26］CAO J，REN Y，YU B，et al. Solid-liquid equilibrium for the ternary systems Na₂CO₃+NaCl+H₂O and Na₂CO₃+Na₂SO₄+H₂O at 313.15 K and atmospheric pressure［J］. The Journal of Chemical Thermodynamics，2019，133：181-193.

［27］CAO J，DING M，REN Y. Solid-liquid equilibria for NaNO₃+NaCl+H₂O and NaNO₃+Na₂CO₃+H₂O systems at 313.15 K［J］. Journal of Chemical & Engineering Data，2019，64（3）：884-894.