共查询到20条相似文献,搜索用时 9 毫秒
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实验室自制的三元共聚物AMV-22与EVA复配,添加SLA-107作助剂,制备适用于胜利油田潍北区块高凝点原油的降凝剂AMVES。实验考察了该降凝剂对原油的降凝降黏效果。DSC热分析结果表明,AMVES加量为1000 mg/L时,可使原油凝点从48℃降低到37℃,析蜡点降低2℃。流变性曲线表明原油的剪切稀释作用随温度升高显著增强,当剪切速率大于100 s^-1后黏度基本不变,降凝剂可以大幅降低启动原油的屈服应力。偏光显微镜图显示原油温度越低,蜡晶网状结构越致密,交联度强,黏度大,流动性差;加AMVES之后原油中蜡晶变为团簇状颗粒,原油的流动性增强。由此可见降凝剂AMVES作用于蜡晶使其三维网状结构破坏,从而有效降低原油凝点和黏度。 相似文献
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方法 根据达西定律 ,从高凝油油藏的矿场生产特点出发 ,首先建立油井生产压差与井筒产液量之间的数学关系模型 ,进而通过历史拟合方法 ,建立地层压力与井筒产液量和井底流压之间的定量关系式。目的 在不停抽情况下 ,根据高凝油油井地面生产资料随时定量分析地层压力变化情况 ,既起到加密求取地层压力资料作用 ,又不因长时间停井结蜡而影响产量。结果 以国内H油区S高凝油油田B单元 8口井共 49个测压点不停抽压力加密监测方法计算 ,其结果比较切合实际 ,平均相对误差仅 1 6 7% ,可以作为重点变化单元动态分析的定点测压的辅助手段。结论 定点测压井不停抽压力加密监测方法适用于高凝油油藏 ,并可作为一种油藏动态分析中压力变化趋势预测的重要辅助手段 ,在油田矿场单元动态分析及动态调配方面具有一定的参考价值。 相似文献
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固相沉积模型在高凝油藏注水开发中的应用 总被引:1,自引:0,他引:1
传统的油-水两相热采模型在进行高凝油注水开发的数值模拟过程中,仅能考虑黏度和相对渗透率曲线随温度变化的影响,而无法表征蜡的固相沉积作用对储层物性的伤害,这种物性变化也是应用不同温度下相对渗透率曲线的前提.为弥补两相热采模型中的这一缺陷,提出了利用固相沉积模型模拟高凝油藏开发,建立了油-水-固三相的热采数值模拟方法,通过与两相热采模型的模拟结果对比,表明蜡沉积对储层渗透率的伤害是高凝油田早期注水开发中最大的影响因素.同时结合热采模型获得了不同注水温度下蜡沉积半径及伤害程度等的定量认识,对更好地研究和预测高凝油田注水开发动态具有重要的指导意义. 相似文献
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魏岗高凝油田常规污水回注开发模式探讨 总被引:4,自引:0,他引:4
魏岗油田位于南阳凹陷,为一断鼻断块圈闭油藏,具有典型的同凝油藏特点,进行热水驱固然不可以提高驱油效率,对提高开发效果有利,但对于中小油田,开发成本投入较大。通过开发前期的常温水驱数字模拟研究,对魏岗油田这样的地层温度与地层析蜡温度高,地热梯度大,地层温度变化补偿快的高凝油藏,投入开发10年后油井井底温度仍然保持在原始温度,注冷水泽开发效果的影响,也主要表现在注水水井氏地带,对生产井乃至整个油藏的影响并不在大。现场采用污水回注开采,既提高了注水温度,也保护了生态环境,保证了油田长期高效的可持续开发。 相似文献
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This study analyzes the performance of a high paraffin reservoir under cold waterflooding for 17 years using a 3-D finite difference simulator and analytical solution of injection wellbore temperature profile to upgrade reservoir management strategies. The reservoir has been marked by injectivity issues, early injection rate decline by half initial values and low incremental recovery, hence subject to alternate developmental schemes. The influence of cold waterflooding is assessed from simulated temperature maps due to nonisothermal injection and solution of injection well temperature profile. 相似文献
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Kai Hu Shengjie Wang Yuyao Zhang Yaqin Zhang Kai Liu 《Petroleum Science and Technology》2017,35(13):1349-1354
The pour point of the crude oil treated with the pour point depressant (PPD) is easily affected by the shear history effect. Models for pour point of PPD-treatment crude oil affected by the shear history effect based on Bayesian regularized artificial neural network (BRANN) were established. The results showed that BRANN models not only had a good ability of fitting to the training data, but also had a good ability of predicting the testing data. By evaluating network performance with several statistical indicators, the three models have excellent performance, high accuracy, and strong generalization ability. The influence of each parameter on the pour point were also investigated through a sensitivity analysis, which shows that the entropy generation due to viscous flow is the most important parameter in predicting the pour point. 相似文献
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就地生成CO2吞吐开采高凝油室内实验研究 总被引:1,自引:2,他引:1
以曹台潜山高凝油为实验介质,利用就地生成CO2技术,通过室内实验研究了CO2吞吐对于高凝油开采的有效程度.实验结果表明:CO2吞吐可以有效地提高高凝油的驱油效率.CO2溶解在高凝油中,可以降低高凝油的粘度、凝固点,改善高凝油的流动特性,在地层中形成溶解气驱,增加地层能量,同时可以降低注水压力,改善吸水剖面.就地生成CO2可以解决包括油气区天然CO2气源的短缺问题,大量CO2气体的运输、储存问题,大量注气带来的环境问题以及CO2注气利用率低和工艺成本费用高的问题等.该研究可以为高凝油藏提高采收率试验提供参考. 相似文献
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高凝原油析蜡点不仅是地面工程设计中的重要参数,也是油藏工程应用中确定合理注水温度的关键指标.文中列举了国内外8种析蜡点测试方法在海外某高凝油田A中的应用,分别筛选出满足地面管输工程和油藏工程应用的析蜡点.结果表明,显微观测法的测试结果最高,在地面管输工程应用中最为保守;地层条件下含气原油析蜡点明显低于地面原油析蜡点,应作为合理注水温度的确定标准. 相似文献
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大庆中蓝石化有限公司柴油加氢精制—改质—异构降凝装置采用了催化柴油加氢精制—改质—异构降凝组合工艺,以FF-36为加氢精制催化剂,3963为加氢改质催化剂,FC-20为加氢降凝催化剂。试生产的结果表明,精制柴油的收率随工艺操作条件的变化而变化,产品的含硫量≤50μg/g,满足国家Ⅳ柴油标准,FF-36、3963和FC-20催化剂活性匹配良好。 相似文献
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The application of greener additives based on vegetable oils has attracted considerable interest due to their biocompatibility and enhanced additive performances compared to conventional additives. Keeping this view in mind and in continuation of our explorative studies on lube oil additives, copolymer of dodecylmethacrylate with olive oil have been synthesized in a focused mono-mode microwave oven using BZP (benzoyl peroxide) as radical initiator. Characterization of the prepared polymers has been performed by spectral (NMR, IR), and SEC-GPC analysis. Performance evaluation of the polymers as pour point depressant (PPD), and viscosity modifier (VM) / viscosity index improver (VII) in different base oils (mineral) have been performed by standard ASTM methods. Biodegradability of the prepared additives was tested against fungal pathogens and microorganisms by disc diffusion (DD) method and by soil burial test (SBT) method respectively. Thermal stability of each of them has been evaluated and included. The multifunctional performances have been compared and reported. The copolymers showed excellent PPD performance along with VM properties and potential biodegradability. 相似文献
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一种生物柴油降凝剂的研制 总被引:1,自引:1,他引:0
以甲基丙烯酸、高碳醇、甲基丙烯酸-2-羟基乙酯等原料合成了具有α-羟基结构的甲基丙烯酸高碳酯的新型聚合物,并对其进行了表征和降凝效果的考察。结果表明,该类型化合物在加剂量为0.1%和0.05%的条件下可使棉籽油生物柴油和兰州炼油厂0#柴油的冷滤点分别降低5℃。 相似文献
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沈84断块高凝油油藏开采方式模拟研究 总被引:4,自引:0,他引:4
沈阳油田沈84断块原油的主要特点是高含蜡、高凝固点,低胶质和低沥青质含量。地层条件下原油粘度较低;油藏埋藏深,油层非均质性严重。针对本断块油藏及其流体特征,运用数值模拟技术,在建立非均质地质模型的基础上,进行了开采方式的优化研究。结果表明,采用注80℃热水段塞是改善这类油藏开发效果,提高采收率的有效途径。 相似文献
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Two bacteria (B1 and B2) were isolated from soil-contaminated sites. The surface properties of biosurfactants produced by these bacteria were determined. These bacteria were given a good resistance to NaCl concentration up to 20%. The surface activity was detected with maximum value at pH7 with B1, whereas B2 was not affected by the change pH (3–12). The biosurfactants of these bacteria were added as a mixture or individual to crude oil given the good result in reducing the pour point. The infrared spectrum of wax or asphaltene fractions of Egyptian crude oil untreated and treated with biosurfactants was detected. 相似文献
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江苏油田具有高温、高矿化度和非均质性严重等特征,目前油田已处于特高含水开发阶段中后期,迫切需要采取进一步提高原油采收率的技术措施。近年来,随着Cr3+/HPAM凝胶调驱技术的日益成熟,开发出适合高温、高矿化度油藏的Cr3+/HPAM凝胶,已具备了物质和技术基础。针对江苏油田开发的实际需求,利用仪器检测和现代物理模拟方法,对适合江苏油田流体性质和油藏特征的Cr3+/HPAM凝胶配方进行了筛选,并对凝胶在多孔介质内的流动特性和调驱效果进行了实验研究。结果表明,聚铬比、聚合物质量浓度和岩心渗透率是影响凝胶注入的主要因素,"调剖+聚合物驱"要比单一的聚合物驱增油效果好。 相似文献