【作者】 高红艳；

【导师】 刘爱贤； 郭绪强； 王雨；

【作者基本信息】 中国石油大学(北京) ， 化学工程（专业学位）， 2020， 硕士

【摘要】 新疆油田环玛湖玛东区块新井开采采取大规模的压裂措施,压裂后的采出液中含有大量胍胶等其它的化学添加剂,导致采出液乳化情况非常严重,这给集中处理站采出液的后续处理带来了较大的困难。因此,深入了解分析玛东区块原油乳状液的特性,根据其特性寻找出有效的破乳方法,并筛选和复配有效的破乳剂是目前急需解决的问题,本课题主要在这方面进行了研究:(1)通过矿场的初步原油脱水实验发现,当玛东区块压裂井采出液掺入越多,集中站预脱水破乳越困难。对玛东区块具有代表性的MDHW101#原油乳状液进行了分析,结果表明:原油的富水区含沥青质质量分数为5.1%,蒽酮法测定开采前期压裂井采出液中胍胶含量高达1589.24mg/L,压裂井采出液的粘度为50.12m Pa·s,Zeta电位为-57.23V。同时也研究了含不同沥青质质量分数和不同浓度胍胶压裂液的乳状液对破乳剂破乳脱水的影响,提出了用酶解法处理新井开采前期含大量胍胶压裂液的采出液,加入10mg/L的甘露聚糖酶,可以提高脱水率8.4%。(2)完成了原油破乳脱水实验,从多种破乳剂中筛选出聚醚型破乳剂BW59和复配出ZG-10两种优良的破乳剂,并利用分散稳定仪分析了破乳剂浓度对破乳过程的影响,以及不同的破乳剂对乳状液界面张力和其Zeta电位的影响。最终通过矿场的试验确定了低含水(含水率低于45%)原油破乳,选择破乳剂BW59效果更好,最佳破乳温度是50℃,最佳破乳浓度是100mg/L;对于高含水原油破乳,选择复合破乳剂ZG-10效果更好,最佳破乳温度为50℃,最佳破乳剂浓度是150mg/L。更多还原

【Abstract】 Large-scale fracturing measures were adopted for the exploitation of new Wells in Ma dong block of Xinjiang oil field.The production fluid after fracturing contained a large amount of gua gum and other chemical additives,which led to more serious emulsification of production fluid,and which brought great difficulties to treat for production fluid in the centralized statioft.Therefore,understanding and analysising the characteristics of the crude oil emulsion in the Ma dong block,and according to its characteristics to find effective demulsification methods,and screening and compounding effective demulsifier are the problems needed to solve quickly,so this thesis conducted on the research in this aspect.(1)The preliminary crude oil dehydration experiment in the field shows that the more the produced fluid is mixed into the fracturing well in madong block,the more difficult it is to dehydrate and demulsify the central station.The representative MDHW101 # crude oil emulsion in the maton block was analyzed,and the results showed that the asphaltene mass fraction of the oil in the rich water area was 5.1%,the content of gua gum in the produced fluid of the fracturing well in the early stage of mining was up to 1589.24 mg/L,the viscosity of the produced fluid of the fracturing well was 50.12 m Pa·s,and the Zeta potential was-57.23 V.At the same time,the effects of different asphaltene mass fractions and different concentrations of guanidine gum fracturing fluids on demulsifier demulsification dehydration were also studied.It was proposed that the extraction fluid containing a large number of guanidine gum fracturing fluids in the early stage of new well mining could be treated by enzymatic hydrolysis,and the dehydration rate could be increased by 8.4% by adding 10mg/L mannanase.(2)The experiment of crude oil demulsification and dehydration two excellent demulsifiers,polyether demulsifier BW59 and compound ZG-10,were screened out from various demulsifiers,and the influence of demulsifier concentration on demulsification process as well as the influence of demulsitier concentration on interfacial tension of emulsion and its Zeta potential were analyzed by dispersion stabilizer.Finally,through the test in the field,it was determined that the demulsifier BW59 had a better effect on demulsification of crude oil with low water content(moisture content less than 45%).The optimal demulsifier temperature was 50℃and the optimal demulsitier concentration was 100mg/L.The best demulsitier is ZG-10 a compound demulsifier for high water-bearing crude oil The optimal demulsifier temperature is 50℃.And the optimal demulsirier concentration is 150mg/L.更多还原