热采用防乳破乳剂的研究与应用
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摘要
稠油在热采高温作用下,容易在油层中发生乳化行为,形成稳定的油包水乳状液,给地面产出液处理流程造成一定的负担。通过分析热采放喷后产出液的含水率为28%、脱水原油的黏度为2 300 mPa·s、胶质与沥青质含量和为24.33%,从醇类、酚醛树脂类、多烯多胺类、复配类的防乳破乳剂中优选出防乳破乳剂PEC-12,幵分析了破乳温度、防乳破乳剂浓度、乳状液含水率对PEC-12防乳破乳剂破乳效果的影响。结果表明,随着破乳温度从50℃升高至80℃,防乳破乳剂的破乳率从44.6%逐渐升至98.2%。防乳破乳剂最经济有效的浓度为200ppm。乳状液中含水率从20%增至40%时,防乳破乳剂的脱水率从62.5%增至93.8%。矿场试验表明,在注热过程中添加防乳破乳剂是一种能有效抑制稠油反相乳化的有效措施,添加PEC-12防乳破乳剂后,地面处理流程显示油包水乳状液总量降低80%,稠油乳状液破乳效果好,处理负担明显减轻,同时跟地面产出液破乳剂发生了协同破乳作用,使处理后的污水中含油量达到设计要求,满足回注地层的水质要求。
Heavy oil is easy to emulsify in the oil layer under the action of high temperature, forming a stable water-in-oil emulsion, which imposes a certain burden on the ground produced liquid treatment process. The analysis results showed that the moisture content of the produced liquid after the thermal recovery was 28%, and the viscosity of the dehydrated crude oil was 2 300 mPa·s, total content of colloidal and asphaltene was 24.33%. And emulsion preventer synergist PEC-12 was screened out from emulsion preventer synergists of alcohols, phenolic resins, polyene polyamines and complexes. The effect of demulsification temperature, emulsion preventer synergist concentration and emulsion moisture content on the demulsification effect of PEC-12 emulsion preventer synergist was analyzed. The results showed that when the demulsification temperature increased from 50 ℃ to 80 ℃,the demulsification rate of the emulsion preventer synergist gradually increased from 44.6% to 98.2%. The most economical and effective concentration of emulsion preventer synergist was 200 ppm. When the water content in the emulsion increased from20% to 40%, the dewatering rate of the emulsion preventer synergist increased from 62.5% to 93.8%. The field test showed that adding emulsion preventer synergist during the heat injection process was an effective measure to effectively inhibit the reverse emulsification of heavy oil. After adding PEC-12 emulsion preventer synergist, the ground treatment process showed that the amount of water-in-oil emulsion reduced by 80%, the load of treatment system was obviously reduced, and the oil content in the treated sewage reached the design requirements and met the re-injection water quality requirements.
Heavy oil is easy to emulsify in the oil layer under the action of high temperature, forming a stable water-in-oil emulsion, which imposes a certain burden on the ground produced liquid treatment process. The analysis results showed that the moisture content of the produced liquid after the thermal recovery was 28%, and the viscosity of the dehydrated crude oil was 2 300 mPa·s, total content of colloidal and asphaltene was 24.33%. And emulsion preventer synergist PEC-12 was screened out from emulsion preventer synergists of alcohols, phenolic resins, polyene polyamines and complexes. The effect of demulsification temperature, emulsion preventer synergist concentration and emulsion moisture content on the demulsification effect of PEC-12 emulsion preventer synergist was analyzed. The results showed that when the demulsification temperature increased from 50 ℃ to 80 ℃,the demulsification rate of the emulsion preventer synergist gradually increased from 44.6% to 98.2%. The most economical and effective concentration of emulsion preventer synergist was 200 ppm. When the water content in the emulsion increased from20% to 40%, the dewatering rate of the emulsion preventer synergist increased from 62.5% to 93.8%. The field test showed that adding emulsion preventer synergist during the heat injection process was an effective measure to effectively inhibit the reverse emulsification of heavy oil. After adding PEC-12 emulsion preventer synergist, the ground treatment process showed that the amount of water-in-oil emulsion reduced by 80%, the load of treatment system was obviously reduced, and the oil content in the treated sewage reached the design requirements and met the re-injection water quality requirements.
引文
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[2]郭太现,苏彦春.渤海油田稠油油藏开发现状和技术发展方向[J].中国海上油气, 2013, 25(4):26-30, 35.
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[4]汪成,孙永涛,王少华,等.泡沫调剖辅助多元热流体吞吐研究与应用[J].钻采工艺,2017, 40(1):102-104.
[5]赵勇,刘庆旺.针对渤海稠油热采添加剂的研制与性能评价[J].当代化工, 2016, 45(4):735-738.
[6]汪成,王少华,孙永涛,等.季铵盐阳离子聚合物防膨剂对W/O乳状液稳定性的影响[J].油田化学, 2017, 34(2):274-277.
[7]马超.尚12-41稠油乳化机理及其防治技术研究[D].山东:中国石油大学(华东), 2013.