The Detection of Bromide Tracer in Hydraulic Fracturing Flowback
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摘要: 随着压裂改造规模的扩大,对化学示踪剂及其检测技术的需求随之增加,但是压裂液添加剂很可能影响检测的灵敏度和准确性。实验研究了瓜胶(HPGG)及聚丙烯酰胺(HPAM)压裂液的模拟返排液中溴离子的酚红分光光度法检测方法及其影响因素。通过分析酚红分光光度法的测定原理,优化了酚红及氯胺T的加量、氧化时间等关键影响因素,指出检测出溴离子的关键在于,酸性条件下(pH值为4.7~5.7)要保证酚红的当量数大于氯胺T的当量数、氯胺T的当量数大于溴离子的当量数。实验建立了酚红光度法测定2种压裂返排液中溴离子浓度的工作曲线,浓度检测范围为2~20 mg/L,线性相关系数在99%以上。检测时应对返排液进行过滤处理,保持溴离子标准工作曲线的操作条件与试样测试时一致,以抵消复杂成分的影响。该方法对溴盐示踪剂的推广应用具有指导意义。Abstract: With increasing scale in reservoir fracturing, more rigorous requirement has been placed on chemical tracers and their detection whose sensitivity and accuracy are both affected by the addition of fracturing fluid additives. In laboratory studies, two simulated fracturing fluid samples formulated with HPGG and HPAM respectively, were detected for the bromide ions using phenol red spectrophotometry method, and the factors affecting the detection were also studied. Key factors affecting the detection, such as amount of phenol red and chloramine T, and time for the oxidation reaction were optimized based on the analysis of the measurement principles of the phenol red spectrophotometry. It is pointed out in the paper that for the bromide ions to be detected, it is critical that at pH between 4.7-5.7 (acidic), the equivalent number of phenol red should be greater than that of chloramine T, whose equivalent number should in turn be greater than that of the bromide ions. Working curves were calculated for the detection of bromide ions in two hydraulic fracturing flowback fluids with the phenol red spectrophotometry. Using the two working curves, concentrations of bromides up to 2-20 mg/L can be detected with linearly dependent coefficient not less than 99%. When detecting the bromide ions, the fracturing flowback fluids should first be filtered, ensuring that the operational conditions for the standard working curve of bromide ions are in agreement with the operational conditions under which the samples are detected, thereby to eliminate the effects of other complex components that may exist in the fracturing flowback fluids. This detection method is instructive in promoting the use of bromide tracers in fracturing fluids.
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Key words:
- Stimulation measure /
- Fracturing fluid /
- Tracer /
- Bromide ion /
- Phenol red spectrophotometry
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[1] 于瑞香,张泰山,周伟生. 油田示踪剂技术. 工业水处理,2007,27(8):12-15.YU Ruixiang, ZHANG Taishan, ZHOU Weisheng. Technique in oil field tracer[J].Industrial Water Treatment, 2007,27(8):12-15. [2] 王潜,曹亚平,于燮佳,等. 井间示踪监测系列技术[C]. 中国石油天然气股份有限公司辽河油田开发技术座谈会,2002. WANG Qian, CAO Yaping,YU Xiejia. Interwell tracer monitoring series technology[C]. Liaohe Oilfield Development Technology Forum of PetroChina,2002. [3] 张作祥,邹信方.油田示踪剂的优选及应用[C].第四届全国石油地质实验技术及实验室管理工作交流会,2002. ZHANG Zuoxiang,ZOU Xinfang.Optimization and application of oil field tracers[C]. The Fourth National Petroleum Geology experimental technology and laboratory management conference, 2002. [4] 陈向楠. 水溶液中溴离子的测定方法研究[D]. 中国海洋大学,2013. CHEN Xiangnan.Research on the determination of bromide in water[D]. Ocean University of China, 2013. [5] 徐春玲. 酚红分光光度法检测采出液中的溴离子[J]. 北京石油化工学院学报,2010,18(1):55-57.XU Chunling. Detection of Bromide Ion in the Oilfield Produced Water by Phenolsulfonphthalein Spectrophotometry[J]. Journal of Beijing Institute of Petro-chemical Technology, 2010,18(1):55-57. [6] 池晓明,李旭航,张世虎,等. 瓜胶压裂液体系示踪剂的筛选[J]. 钻井液与完井液,2015,32(5):83-85.CHI Xiaoming, LI Xuhang, ZHANG Shihu,et al. Selection of tracers used in guar gum fracturing fluid[J]. Drilling Fluid & Completion Fluid, 2015,32(5):83-85. [7] 伍渊云. 工业盐中溴离子测定方法的研究[J]. 中国井矿盐,2016,47(5):40-44.WU Yuanyun. Research of the determinaton method of bromide ion in industrial salt[J]. China Well And Rock Salt, 2016,47(5):40-44. [8] 王璇,董丽,陈金祥,等.水中溴化物的测定方法改进[J]. 地质学刊,2009,33(3):280-284.WANG Xuan, DONG Li, CHEN Jinxian, et al. Improved testing method of bromide in water[J]. Journal of Geology, 2009,33(3):280-284. [9] 姜峰,孙磊,杨再广,等. 溴化钾型示踪剂检测的改进方法[J]. 应用化工,2014,43(1):178-180.JIANG Feng,SUN Lei,YANG Zaiguang, et al. A improved test method for potassium bromide tracer[J]. Applied Chemical Industry, 2014,43(1):178-180. [10] 沈敏. 卤水中溴离子的测定-酚红分光光度法[J]. 中国井矿盐,1993,24(5):42-43.SHEN Min. Determination of bromine in brine——phenol red spectrophotometric method[J].China Well And Rock Salt, 1993,24(5):42-43. [11] 赵政嘉,顾玉洁,才博,等. 示踪剂在分段体积压裂水平井产能评价中的应用[J]. 石油钻采工艺,2015, 37(4):92-95.ZHAO Zhengjia, GU Yujie, CAI Bo, et al. Application of tracer in productivity evaluation for horizontal wells under segmented volume fracturing[J].Oil Drilling & Production Technology, 2015,37(4):92-95.
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