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1.
    
Abstract

The rheological behavior and its variation with temperature and refined product concentration of a crude oil sample coming from a quagmire of the separation station of Tin Fouye Tabankort oilfield/southern Algeria were investigated experimentally. The experiments were carried out at various temperatures (20, 30 and 50?°C) over the shear rate range of 0 to 700?s?1 by using a controlled stress rheometer (AR 2000, TA Instrument). The results showed that the crude oil exhibit non-Newtonian of shear thinning behavior at low shear rate and Newtonian behavior at high shear rate and was adequately described by Casson and Herschel–Bulkley models. The rheological measurements through the steady flow test and viscoelastic behavior, including the storage modulus (G′), loss modulus (G″), and complex modulus (G*), has indicated that the rheological properties of the crude oil were greatly influenced by the temperature and the additive concentration.  相似文献   

2.
    
An experimental study was conducted to investigate the rheological behavior of Algerian crude oil stemming from station of separation (quagmire) of the Tin Fouye Tabankort sector (southern Algeria). The rheological measurements at different temperatures (20°C, 30°C and 50°C) were performed employing AR 2000 rheometer of TA-Instruments. Several parameters such as shear rate, the temperature and the presence of crude oil from another quagmire on the rheological properties have been studied. The experimental results show that the studied crude oil displays non-Newtonian shear thinning behavior at low values of shear rate and a Newtonian behavior at high values of shear rate, which can be best presented by the Casson model. The rheological examination tests (flow and dynamic mode (oscillation)) have shown that the rheological properties of the crude oil were significantly influenced by the temperature and the crude oil addition.  相似文献   

3.
    
The thixotropic characteristics of xanthan solutions and their emulsions with crude oil were investigated experimentally. Understanding these characteristics are required for the crude oil displacement mechanism by polymer solution during the enhanced oil recovery phase. RS100 rheometer with a cone and plate device was employed for this examination using controlled-rate mode. Two crude oil concentrations of 25% and 75% by volume were examined. A wide range of xanthan gum concentration of 500–104 ppm was covered. This study results that the aqueous solutions of xanthan gums showed thixotropic behavior. The high concentrations of xanthan solutions provide higher hysteresis loop than the solutions of lower concentrations. The existence of crude oil within the xanthan emulsions considerably elevates the thixotropic rheograms profile.  相似文献   

4.
    
The steady shear viscosity of a Shengli waxy crude oil at the temperature of 3°C to 4°C, higher than its gel point, was measured by using a parallel-plate rheometer, which shows a shear thickening behavior in the shear rate range of 10?2–10?1 s?1. A spectrum model proposed in our previous work was modified here by considering the modulus change in the spectra, which could be caused by a shear-induced varying internal structure in the crude oil. The shear strengthening viscosity of the Shengli crude oil can be described well by the changing-spectrum viscosity model.  相似文献   

5.
    
Some heavy oil reservoirs present foamy oil flow behavior under primary production, and the foamy oil viscosity and rheological property are important factors that influence the efficiency of the process. The variation of the foamy oil viscosity during the depletion process is complicated due to the generation and migration of dispersed gas bubbles within the oil phase, and still remains as a controversial topic.

?This study aims to investigate this issue by measuring the foamy oil viscosity at different pressure, temperature and flow rate with a capillary viscometer system equipped with a specially designed foamy oil generator to guarantee the generation and stable flow of gas-in-oil dispersions. Meanwhile, the dead oil and live oil viscosities were also measured for comparison.

?Based on the results from all the tests the following conclusions can be drawn. Below the bubble point pressure, the dispersed gas-bubble volume fraction and foamy oil viscosity increase with pressure decline; the viscosity of foamy oil is higher than that of live oil, and the gap between them widens with pressure decline. Moreover, foamy oil behaves as shear-thinning power-law fluid, and the shear-thinning effect becomes stronger with the decrease of pressure. The foamy oil rheology is also affected by temperature, and the shear-thinning effect becomes milder with the increase of temperature. Based on the experimental data, a formula was established for estimating foamy oil apparent viscosity within porous media, which took flow rate, shear-thinning flow parameters, permeability, porosity and other factors into consideration.  相似文献   

6.
流变学及粘度检测技术新发展   总被引:3,自引:0,他引:3  
张钦哉 《石油仪器》1997,11(1):7-11
文章简述了流变学原理及其三个学派(实效学派、理论学派和学院学派)和观点和方法,概述了流体了主要是非牛顿流体的粘度特性以及影响流体流变特性的诸因素。介绍了80年代的粘度测量技术和先进的流变分析方法和粘度测量技术。  相似文献   

7.
杨顺辉 《油田化学》2004,21(1):79-81
自行设计并制造了高温高压落球法液体粘度测定仪,简介了主要构件,用乙二醇、丙二醇、丙三醇等校准,粘度测定值的相对误差小于1%。在温度分别为40℃、50℃、60℃、70℃、80℃,流体静压力分别为0.1、1、5、10、15、20MPa,含水率分别为0%、10%、20%、30%、50%、70%、90%的条件下,测定了新疆塔河油田高粘重质原油(含蜡4.14%,密度0.9586g/cm3)及其水乳状液的粘度,共计得到了210个粘度数据并列表给出。粘度随温度升高而降低,符合一段规律。在每一含水率和温度下,粘度随流体静压力升高而增大,增幅随温度升高而减小。在每一流体静压力下,粘度~含水率曲线通过峰值,峰值位于含水率20%处,峰高随温度升高而减小,含水率超过20%后原油乳状液由油包水型转变为水包油型。给出了4组粘度~温度和粘度~含水率曲线作为示例。典型粘度数据:781.4mPa·s(含水0%,50℃,0.1MPa);1406mPa·s(含水0%,50℃,20MPa);431.5mPa·s(含水30%,50℃,0.1MPa)。图5表1参2。  相似文献   

8.
Effect of surfactants on rheological properties of heavy crude oil obtained from Mehsana Asset, Gujarat, India, were studied. Studies on effectiveness towards flow behavior were made using a surfactant extracted from a tropical Indian plant Madhuca longifolia (Mahua) and nonionic surfactant Brij-30 considering various contributing parameters such as temperature, concentration, and shear rate. Tests were performed at controlled shear rate. At 25°C, 2000 ppm Mahua and Brij-30 addition reduced viscosity of crude oil by 48% and 52%, respectively. Complex and viscous modulus of crude oil decreased significantly due to addition of both the surfactants. FTIR studies of crude-surfactant mixture showed remarkable decrease in concentration of viscosity enhancing groups such as alkanes, alcoholic, and acidic groups indicating the effectiveness of both the surfactants. Naturally extracted surfactant may be used as flow improver for transporting heavy crude oil.  相似文献   

9.
杨祖国  高秋英  任波  路熙 《油田化学》2021,38(1):101-107
针对边底水薄层特稠油油藏热采高轮次后注汽易窜,封堵困难,含水大幅上升导致开发效益下降的问题,以丙烯酰胺(AM)、丙烯酸钠(AA)、4-苯基-1-丁烯(PB)、丙烯酰胺-2-甲基丙磺酸(AMPS)为原料、四甲基乙二胺为催化剂制备了水溶性活性分子共聚物(AAPA).研究了油剂比、AAPA加量、pH值、Ca2+、Mg2+、温...  相似文献   

10.
用磺化稠油降低稠油粘度的初步研究   总被引:1,自引:1,他引:1  
罗健辉  赵常青  张灯  王克  江波 《油田化学》2003,20(3):208-209,241
在低温下 (15~ 2 0℃ )用 5 0 %~ 6 0 %的硫酸将辽河稠油磺化 ,得到了一系列磺化稠油 ,在 5 0℃粘度为 115 3mPa·s的辽河稠油中按质量比 2 g/kg加入磺化稠油 ,使 5 0℃粘度降至 786~ 914mPa·s ,降粘率为 19.8%~31.8%。将磺化反应进行优化 ,得到磺化稠油的最好制备条件 :5 5 %硫酸 ,用量为稠油的 1.5 % ,在 15℃反应 2h。得到的磺化稠油在加剂量为 2 g/kg时使稠油 5 0℃粘度下降 30 .8%。稠油降粘率与加剂量的关系曲线很复杂 ,经过一个明显的极大值和一个极小值 ,极大值对应的加剂量为 2 g/kg ,即最佳加剂量。讨论了稠油降粘机理。图 1表 1参 2。  相似文献   

11.
The heavy crude oil exhibits a non-Newtonian shear thinning behavior over the examined shear rate. The viscosity of the heavy crude oil decreases about 15.6% when the temperature increased from 30 to 60°C. Heavy crude oil was blended with the aqueous solution of surfactant and saline water in different volumetric proportions of NaCl, and Na2CO3 solution mixtures. The addition of 50% of the mixture to the heavy crude oil causes a strong reduction in the viscosity, about 67.5% at 60°C. The heavy crude oil fits the Power law model since it has the lowest average absolute percent error of 0.0291. The flow behavior index of the heavy crude oil reaches a value of 0.9305 at a temperature of 30°C and it increases to 0.9373 when the temperature raises 60°C, while the consistence coefficient decreases from 2.8811 to 2.3558.  相似文献   

12.
Viscosities of crude oil solutions from 0.1 to 1.0% (v/v) have been studied in 1,4-Dioxan as a solvent at temperature ranging from 293 to 313 K. Huggins, Kraemer, Martin, and Schulz-Blaschke relations were used by viscosity data to evaluate intrinsic viscosities and viscometric constant values. Degree of viscosity reduction (DVR) was also calculated. The size of the isolated molecule was evaluated in terms of intrinsic viscosity and shows that interactions between solute and solvent decrease with the rise in temperature.  相似文献   

13.
    
Wax precipitates from crude oil when a fluid is cooled down below its wax appearance temperature (WAT). This particularly happens during the transportation of crude oil in the pipeline system. In this study, chemical inhibitors were chosen to prevent and reduce wax formation using seven different types of inhibitors, which are poly (ethylene-co-vinyl acetate) (EVA), poly (maleic anhydride-alt-1-octadecene) (MA), diethanolamine (DEA), cocamide diethanolamine (C–DEA), toluene, acetone, and cyclohexane. The total waxes deposited from the cold finger test are subjected to the type of inhibitor, rotation speed of impeller, and inhibitor concentration. EVA is suggested as the most effective inhibitor based on the amount of wax deposit weight and the value of viscosity. Therefore, this result might be useful for further research work related to wax deposition in the area of crude oil production.  相似文献   

14.
采用离子交换色谱分离技术将辽河油田杜 -84稠油按化学官能团分为酸性分、碱性分、两性分和中性分 ,同时按极性分离得到胶质和沥青质组分。用元素分析、红外光谱、相对分子质量及酸碱值测定等手段对各组分进行了分析鉴定。又测定了各组分模拟油溶液的油水界面粘度 (IFV) ,考察了油相芳香度、水相 p H值等因素对油水界面粘度的影响。结果表明 ,酸性分和碱性分具有较高的油水界面粘度 ,尤其在水相碱性条件下 ,酸性分的油水界面粘度最高 (p H=1 2时达 0 .1 2 m N· s/m) ,两性分和中性分的油水界面粘度较低 ;沥青质的油水界面粘度明显高于胶质。酸性分的油水界面粘度一般随油相芳香度增大而增大 ,而碱性分油水界面粘度随油相芳香度增大而明显减小 ,两性分和中性分的油水界面粘度随油相芳香度的变化不大。酸性条件下 ,碱性分具有较高的油水界面粘度 ;碱性条件 (p H=1 1以上 )下 ,酸性分具有很高的油水界面粘度。水相碱性条件下稠油中的活性组分主要是官能团组分的酸性分或极性组分的沥青质。油相高芳香度和水相碱性条件有利于 O/W型超稠油乳状液的稳定。官能团组分更能揭示稠油中界面活性组分的内在本质  相似文献   

15.
核磁共振测井是唯一能够提供原油粘度信息的测井。通过对某地区6桶油样进行核磁共振测量与分析,建立了弛豫时间T2与粘度的关系,其相关系数达到0.966,以此关系式可以利用核磁共振测井来估算地下原油粘度。在分析了油样T2分布随温度变化情况后,可以根据T2分布的形态判断稠油类储层的流体性质。  相似文献   

16.
    
Abstract

Effect of surfactant and extra-light crude oil addition on the rheological behaviors of an Algeria crude oil in order to improving its flowability were studied at low temperature. These rheological properties include steady flow behavior, yield stress and viscoelastic behavior. An AR-2000 rheometer was employed in all of the rheological examination tests. Results show that Toluene and extra-light crude oil addition causes a strong reduction in viscosity, the yield stress and can effectively increase of crude oil transport capacity. The toluene addition gets its best flow capacity and lowest viscosity at 6%. The extra-light crude oil addition obtains its best flow capacity and lowest viscosity at 50%. The viscoelasticity character of the crude oil has indicate a significantly influence by the addition of Toluene and extra-light crude oil.  相似文献   

17.
于梅  郭昌维  吕双庆  袁雪芝 《润滑油》2006,21(6):20-23,58
大庆原油与俄罗斯原油按不同比例混合的350-400℃、400-450℃和450-500℃润滑油馏分油经过酮苯脱蜡、糠醛精制和白土精制后,得到基础油典型馏分油,进行润滑油基础油性质评价;通过对非大庆石蜡基原油、俄罗斯原油和大庆原油混兑,重点对润滑油馏分油进行同样工艺试验和评价,为大连石化分公司在保证润滑油基础油质量的前提下有效利用原油资源、合理引进加工原油提供了参考依据。  相似文献   

18.
原油注碱防腐技术在常减压装置中的应用   总被引:1,自引:0,他引:1  
常减压装置发生低温腐蚀的原因主要是由于HCl的存在破坏了设备表面形成的FeS保护膜.对原油注碱能有效缓解常减压装置的设备腐蚀情况,适宜的注碱条件为:注入点设在电脱盐后的原油管线上,碱液中NaOH质量分数为4%,注碱速率为16.7 mL/s,每吨原油中NaOH的注入量为2.5 g.结果表明,加工相同原油时,通过注碱可使常压塔塔顶换热器腐蚀速率下降约80%,常压塔塔顶回流罐污水中Cl-质量浓度至少下降80%,常压塔塔顶回流罐污水pH值维持在6.0~7.5,中和剂消耗量也由注碱前的150~180 kg/d降低至注碱后的100~120 kg/d,且注碱操作不会影响常减压装置工艺运行的稳定和二次加工装置的原料质量.  相似文献   

19.
轮南、桑解油田部分储层原油沥青质含量高,生产过程中沥青质析出,造成井筒举升困难及地面集输管线超压,导致油井无法正常生产.为了解决上述问题,通过室内研究与现场试验,研发了一种耐高温、抗高矿化度的水溶性稠油降黏剂JN-1,并设计了3种针对不同油井管柱、原油物性特征的药剂加注工艺.该稠油化学降黏工艺解决了高温、高矿化度条件下...  相似文献   

20.
加热地层以降低原油黏度是蒸汽吞吐的主要机理之一;构建考虑热对流和热传导的动态传热模型;通过耦合温度场和压力场;计算地层压力、地层温度和流体对流速度;进而分析地层热量的动态变化规律。 结果表明:在注汽阶段;周期注汽量相同的条件下;注汽时间为6.0~10.0 d时;加热速度和地层净热量均较高;在焖井阶段;压力停止上升;热对流快速减弱;地层加热速度大幅下降;焖井4.0 d后降幅达88.3%;可以开井生产;在采油阶段;热传导起主要作用;地层热量缓慢稳步上升;经过1个吞吐周期;地层热量增量的57.7%随着产液被回收;42.3%保留在地层中。该研究可以更好地了解蒸汽吞吐过程中的地层热量变化规律;为注采参数的优化和蒸汽热量的流向分析提供支撑。  相似文献   

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