基于Fe~(2+)质量浓度变化的聚合物黏度损失影响因素
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摘要
针对Fe~(2+)的存在会对聚合物溶液黏度造成较大损失的问题,考察了Fe~(2+)对聚合物黏度的影响情况。结果表明:1)当Fe~(2+)初始质量浓度大于20 mg/L时,聚合物溶液会生成絮状胶体物质,造成滤膜孔隙堵塞。2)体系中还原性条件缺失时,聚合物黏度损失只取决于限量反应物(Fe2+或O2)的初始质量浓度,当Fe~(2+)或O~2其中一种物质反应完全时,聚合物黏度损失停止。3)当剪切速率为8.0 s~(-1),Fe~(2+)初始质量浓度小于0.32 mg/L时,聚合物黏度损失不超过10%;当剪切速率为0.2 s~(-1),Fe~(2+)初始质量浓度小于1.30 mg/L时,聚合物黏度损失不超过25%。4)聚合物黏度损失会随聚合物初始质量浓度增加而减弱。
Since the content of Fe~(2+) causes a marvelous loss of polymer fluid viscosity, the potential influence of Fe~(2+) on polymer flooding was studied in this article. The results show that when the initial mass concentration of Fe~(2+) is greater than 20 mg/L, the solution system will produce flocculent colloids, leading to filter membrane porosity block; under short-redox condition, the loss of polymer viscosity depends on the preliminary mass concentration of limited reactant Fe~(2+) or O_2, and polymer viscosity loss would stop when anyone of Fe~(2+) or O_2 consumes completely; moreover, with shearing rate at about 8.0 s~(-1) and initial Fe~(2+) mass concentration less than 0.32 mg/L, polymer viscosity loss never exceeds 10%; with shearing rate at about 0.2 s~(-1) and initial Fe~(2+) mass concentration less than 1.30 mg/L, polymer viscosity loss never exceeds 25%. The viscosity loss of polymer would drop off as the polymer concentration increases.
Since the content of Fe~(2+) causes a marvelous loss of polymer fluid viscosity, the potential influence of Fe~(2+) on polymer flooding was studied in this article. The results show that when the initial mass concentration of Fe~(2+) is greater than 20 mg/L, the solution system will produce flocculent colloids, leading to filter membrane porosity block; under short-redox condition, the loss of polymer viscosity depends on the preliminary mass concentration of limited reactant Fe~(2+) or O_2, and polymer viscosity loss would stop when anyone of Fe~(2+) or O_2 consumes completely; moreover, with shearing rate at about 8.0 s~(-1) and initial Fe~(2+) mass concentration less than 0.32 mg/L, polymer viscosity loss never exceeds 10%; with shearing rate at about 0.2 s~(-1) and initial Fe~(2+) mass concentration less than 1.30 mg/L, polymer viscosity loss never exceeds 25%. The viscosity loss of polymer would drop off as the polymer concentration increases.
引文
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[2]王继良.印度尼西亚Widuri油田聚合物驱除铁稳黏技术研究与应用[J].石油化工应用,2017,36(2):120-124.
[3]刘进祥,卢祥国,牛丽伟,等.两性离子聚合物凝胶的性能评价及矿场应用效果分析[J].西安石油大学学报(自然科学版),2015,30(6):81-88.
[4]刘卫东,罗莉涛,廖广志,等.聚合物-表面活性剂二元驱提高采收率机理实验[J].石油勘探与开发,2017,44(4):600-607.
[5] SHENG J J, LEONHARDT B, AZRI N. Status of polymer-flooding technology[J]. Journal of Canadian Petroleum Technology,2015,42(2):116-126.
[6] LET M S,PRISCILLA K,MANICHAND R N,et al. Polymer flooding a~500-cp oil[R]. SPE 154567,2012.
[7] SHENG J. Modern chemical enhanced oil recovery:theory and practice[M]. Boston:Gulf Professional Publishing,2010:110-115.
[8] GRLLMANN U, SCHNABEL W. Free radical-induced oxidative degradation of polyacrylamide in aqueous solution[J]. Polymer Degradation and Stability,1982,4(3):203-212.
[9] RAMSDEN D K, MCKAY K. The degradation of polyacrylamide in aqueous solution induced by chemically generated hydroxyl radicals:autoxidation of Fe2+[J]. Polymer Degradation and Stability,1986,15(1):15-31.
[10] WANG D. Enhanced oil recovery field case studies[M]. Boston:Gulf Professional Publishing,2013:83-116.
[11] RAMSDEN D K, MCKAY K. Degradation of polyacrylamide in aqueous solution induced by chemically generated hydroxyl radicals:fenton′s reagent[J]. Polymer Degradation and Stability,1986,14(3):217-229.
[12] SERIGHT R S,SKJEVRAK I. Effect of dissolved iron and oxygen on stability of HPAM polymers[R]. SPE 169030,2014.
[13]刘希,伊卓,方昭,等.驱油聚合物过滤因子测试方法的研究[J].石油化工,2015,44(2):241-245.
[14] JOUENNE S,KLIMENKO A,LEVITT D. Polymer flooding:establishing specifications for dissolved oxygen and iron in injection water[R]. SPE 179614,2017.
[15] FLETCHER A J P,LAMB S P,CLIFFORD P J. Formation damage from polymer solutions:factors governing injectivity[J]. SPE Reservoir Engineering,1992,7(2):237-246.
[16] VOELKER B M,MOREL F M M,SULZBERGER B. Iron redox cycling in surface waters:effects of humic substances and light[J]. Environmental Science&Technology,1997,31(4):1004-1011.
[17] LEVITT D B,SLAUGHTER W,POPE G,et al. The effect of redox potential and metal solubility on oxidative polymer degradation[R].SPE 129890,2010.
[18] SERIGHT R S,CAMPBELL A,MOZLEY P,et al. Stability of partially hydrolyzed polyacrylamides at elevated temperatures in the absence of divalent cations[R]. SPE 121460,2009.
[19] WELCH K D, DAVIS T Z, AUST S D. Iron autoxidation and free radical generation:effects of buffers,ligands,and chelators[J]. Archives of Biochemistry and Biophysics,2002,397(2):360-369.
[20] GAILLARD N,SANDERS D B,FAVERO C. Improved oil recovery using thermally and chemically protected compositions based on coand ter-polymers containing acrylamide[R]. SPE 129756,2010.
[21] WELLINGTON S L. Biopolymer solution viscosity stabilization-polymer degradation and antioxidant use[J]. SPE Journal,1983,23(6):901-913.