低渗透油田措施返排液对原油乳状液破乳效果的影响及对策 effect of flowback fluid on crude oil demulsification in low permeability oil field and countermeasure.pdfVIP

行业论坛 张铜耀等：低渗透油田措施返排液对原油乳状液破乳效果的影响及对策 低渗透油田措施返排液对原油乳状液破乳效果的影响及对策* 1 1 张铜耀 陈科 摘要：渤海某低渗透油田在经过压裂酸化措施后，大量措施返排液改变了原油产出液 的状态，导致原油乳化加剧，破乳困难。针对此问题，研究了不同类型措施返排液对 破乳剂效果的影响，并提出了相应的改善对策。实验结果表明：在破乳剂浓度为200 mg/L 时，酸化残液乳状液破乳效果极差，脱水率仅为5%，压裂废液乳状液的脱水率相对较 高；通过对比模拟水、污水配制的乳状液破乳效果，提出了稀释、沉降、消除污水中 高价金属离子的含量来提高乳状液破乳效果的对策；随着稀释倍数的增加，乳状液的 破乳效果逐渐增加，稀释5倍时，脱水率达到65%；提高污水的pH值能够大幅度提高 其破乳效果，乳状液脱水率由原来的10%提高到70%。 关键词：低渗透油田；措施返排液；乳状液；破乳；影响；对策 Doi:10.3969/j.issn.1006-6896.2016.2.002 EffectofFlowbackFluidonCrudeOilDemulsification inLowPermeabilityOil FieldandCountermeasure ZhangTongyao，ChenKe Abstract：Alotofflowbackwaterwhichchangedthestatusoftheoilproducedfluidshad beenproducedafterfracturingandacidizingmeasuresinalowpermeabilityoilfieldinBohai， resultinginoilemulsionseriouslyandhardtobreak．Tosolvethisproblem，theeffectsof differenttypesofmeasuresresidueforbreakingeffectwasstudied，andthecorrespondingim- provementmeasureswasproposed．Theresultsshowthat：whendemulsifierconcentrationis 200 mg/L，thebreakingeffectofacidifiedresidueemulsionispoor，dehydrationrateis 5%， fracturingwasteemulsionhasarelativelyhighdehydrationrate；Bycomparingthe breaking effectofsimulationofwaterandwastewateremulsion，thepaperproposedtodilution，sedi- mentationandeliminatethehighmetalioncontentinwastewatertoimprovetheeffectofthe emulsion breaking．With the increase of dilution，the demulsification of the emulsion is graduallyincreased，whendiluted 5 times，thedehydrationrateof 65%；increasethepHof effluentemulsioncansignificantlyimprovetheemulsiondehydrationratefrom 10%to 70%.