The viscosity of water with copper oxide nanoparticle suspensions was measured using capillary viscometers. The mass fractions of copper oxide nanoparticles in the experiment, w , varied between 0.02 and 0.10, a...The viscosity of water with copper oxide nanoparticle suspensions was measured using capillary viscometers. The mass fractions of copper oxide nanoparticles in the experiment, w , varied between 0.02 and 0.10, and the temperature range was 30℃ to 80℃. The experimental results show that the temperature was the major factor affecting the viscosity of the nanoparticle suspensions, while the effect of the mass fraction on the viscosity was not so obvious as that of the temperature for the mass fractions chosen in the experiment. The effect of the capillary tube size on the viscosity was also found to be relatively important at higher mass fractions.展开更多
CO_2在压裂过程中黏度较小,导致携砂能力较弱,压裂效果不明显。为改善CO_2的黏度,增强压裂效果,基于相似相溶理论和分子作用力理论,制备了具有一定分子质量可显著增稠的硅氧烷聚合物,并以甲苯作为助溶剂,使用毛细管压差计,对不同压力和...CO_2在压裂过程中黏度较小,导致携砂能力较弱,压裂效果不明显。为改善CO_2的黏度,增强压裂效果,基于相似相溶理论和分子作用力理论,制备了具有一定分子质量可显著增稠的硅氧烷聚合物,并以甲苯作为助溶剂,使用毛细管压差计,对不同压力和温度下不同质量浓度的增稠剂进行增稠性能测试,分析测试效果。结果表明:分子中加入恒定比例的疏CO_2基团,其溶解性能不变,但增稠效果显著增大;相同质量浓度的增稠剂,相同压力下随温度的升高,其增稠效果显著降低,相同温度下随压力的升高,其增稠效果升高不明显;文中测试最大黏度为1.2 m Pa·s(增稠30倍)。另外,较小的分子质量有利于聚合物在CO_2中的溶解和增稠,硅氧烷类增稠剂在压裂过程中可以避免地下水和地表水的污染。合成的聚合物能够明显提高液态CO_2的黏度,测试结果表明,硅氧烷作为CO_2增稠剂时的合成规则及其使用条件,可以为压裂用超临界CO_2增稠剂的设计提供参考。展开更多
In this paper, the effects of shear rate on the intrinsic viscosity measurement of partially Hydrolysed Polyacrylamide (HPAM) in salt solution were studied with homemade multibulb viscometer and low shear rate rheomet...In this paper, the effects of shear rate on the intrinsic viscosity measurement of partially Hydrolysed Polyacrylamide (HPAM) in salt solution were studied with homemade multibulb viscometer and low shear rate rheometer. The critical shear rate of HPAM in salt solution for high molecular weight HPAM was determined. A low shear rate capillary viscometer was designed in which the [eta] approached to value at zero shear rate can be obtained for HPAM -salt system. The effect of molecular weight on shear rate dependence of viscosity was also studied.展开更多
A procedure for preparing a nanofluid that a solid-liquid composite material consists of solid nanoparticles with sizes typically of 1-100 nm suspended in liquid was proposed. By means of the procedure, Cu-H2O nanoflu...A procedure for preparing a nanofluid that a solid-liquid composite material consists of solid nanoparticles with sizes typically of 1-100 nm suspended in liquid was proposed. By means of the procedure, Cu-H2O nanofluids with and without dispersant were prepared, whose sediment pho-tographs and particle size distribution were given to illustrate the stability and evenness of suspension with dispersant. The viscosity of Cu-H2O nanofluid was measured using capillary viscometers. The mass fractions（w） of copper nanoparticles in the experiment varied between 0.04% and 0.16% with the temperature range of 30-70 ℃. The experimental results show that the temperature and SDBS concentration are the major factors affecting the viscosity of the nano-copper suspensions, while the effect of the mass fraction of Cu on the viscosity is not as obvious as that of the temperature and SDBS dispersant for the mass fraction chosen in the experiment. The apparent viscosity of the copper nano-suspensions decreases with the temperature increase, and increases slightly with the increase of the mass fraction of SDBS dispersant, and almost keeps invariability with increasing the mass fraction of Cu. The influence of SDBS concentration on the viscosity of nano-suspension was relatively large comparing with that of the nanoparticle concentration.展开更多
为了准确测量油藏条件下气体、液体和气液混合物的运移黏度,依据泊肃叶定律设计了毛细管黏度计。毛细管黏度计主要包括注入系统、测量系统、回压控制系统和辅助系统4个部分。针对气体、液体和气液混合物的特性,分别设计了气体注入系统...为了准确测量油藏条件下气体、液体和气液混合物的运移黏度,依据泊肃叶定律设计了毛细管黏度计。毛细管黏度计主要包括注入系统、测量系统、回压控制系统和辅助系统4个部分。针对气体、液体和气液混合物的特性,分别设计了气体注入系统、液体注入系统和气液混合注入系统,并研制了不同内径的毛细管和不同渗透率的孔隙介质模型模拟油藏孔隙。结果表明,毛细管黏度计实现了气体、液体和气液混合物的注入速度准确计量和黏度测量,回压控制系统采用回压式位移量化控制系统精准控制回压,提高了毛细管黏度计测量的准确度和精度。在模拟油藏条件氮气黏度非常低,仅为0.018 mPa·s,而聚合物和泡沫体系毛细管黏度较高,分别为78 m Pa·s和126 m Pa·s。展开更多
基金Supported by the National Natural Science Foundationof China( No. 5 9995 5 5 0 - 3 )
文摘The viscosity of water with copper oxide nanoparticle suspensions was measured using capillary viscometers. The mass fractions of copper oxide nanoparticles in the experiment, w , varied between 0.02 and 0.10, and the temperature range was 30℃ to 80℃. The experimental results show that the temperature was the major factor affecting the viscosity of the nanoparticle suspensions, while the effect of the mass fraction on the viscosity was not so obvious as that of the temperature for the mass fractions chosen in the experiment. The effect of the capillary tube size on the viscosity was also found to be relatively important at higher mass fractions.
文摘CO_2在压裂过程中黏度较小,导致携砂能力较弱,压裂效果不明显。为改善CO_2的黏度,增强压裂效果,基于相似相溶理论和分子作用力理论,制备了具有一定分子质量可显著增稠的硅氧烷聚合物,并以甲苯作为助溶剂,使用毛细管压差计,对不同压力和温度下不同质量浓度的增稠剂进行增稠性能测试,分析测试效果。结果表明:分子中加入恒定比例的疏CO_2基团,其溶解性能不变,但增稠效果显著增大;相同质量浓度的增稠剂,相同压力下随温度的升高,其增稠效果显著降低,相同温度下随压力的升高,其增稠效果升高不明显;文中测试最大黏度为1.2 m Pa·s(增稠30倍)。另外,较小的分子质量有利于聚合物在CO_2中的溶解和增稠,硅氧烷类增稠剂在压裂过程中可以避免地下水和地表水的污染。合成的聚合物能够明显提高液态CO_2的黏度,测试结果表明,硅氧烷作为CO_2增稠剂时的合成规则及其使用条件,可以为压裂用超临界CO_2增稠剂的设计提供参考。
基金This work ws supported by the National Natural Science Foundation of China and Polymer Physics Laboratory,Institute of Chemistry,Academia Sinica.
文摘In this paper, the effects of shear rate on the intrinsic viscosity measurement of partially Hydrolysed Polyacrylamide (HPAM) in salt solution were studied with homemade multibulb viscometer and low shear rate rheometer. The critical shear rate of HPAM in salt solution for high molecular weight HPAM was determined. A low shear rate capillary viscometer was designed in which the [eta] approached to value at zero shear rate can be obtained for HPAM -salt system. The effect of molecular weight on shear rate dependence of viscosity was also studied.
基金Funded by Guangdong Provincial Natural Science Foundation (No. 04105950)Specialized Research Fund for the Doctoral Program of Higher Education (No. 20050561017)Program for New Century Excellent Talents in University (No. NCET-04-0826)
文摘A procedure for preparing a nanofluid that a solid-liquid composite material consists of solid nanoparticles with sizes typically of 1-100 nm suspended in liquid was proposed. By means of the procedure, Cu-H2O nanofluids with and without dispersant were prepared, whose sediment pho-tographs and particle size distribution were given to illustrate the stability and evenness of suspension with dispersant. The viscosity of Cu-H2O nanofluid was measured using capillary viscometers. The mass fractions（w） of copper nanoparticles in the experiment varied between 0.04% and 0.16% with the temperature range of 30-70 ℃. The experimental results show that the temperature and SDBS concentration are the major factors affecting the viscosity of the nano-copper suspensions, while the effect of the mass fraction of Cu on the viscosity is not as obvious as that of the temperature and SDBS dispersant for the mass fraction chosen in the experiment. The apparent viscosity of the copper nano-suspensions decreases with the temperature increase, and increases slightly with the increase of the mass fraction of SDBS dispersant, and almost keeps invariability with increasing the mass fraction of Cu. The influence of SDBS concentration on the viscosity of nano-suspension was relatively large comparing with that of the nanoparticle concentration.
文摘为了准确测量油藏条件下气体、液体和气液混合物的运移黏度,依据泊肃叶定律设计了毛细管黏度计。毛细管黏度计主要包括注入系统、测量系统、回压控制系统和辅助系统4个部分。针对气体、液体和气液混合物的特性,分别设计了气体注入系统、液体注入系统和气液混合注入系统,并研制了不同内径的毛细管和不同渗透率的孔隙介质模型模拟油藏孔隙。结果表明,毛细管黏度计实现了气体、液体和气液混合物的注入速度准确计量和黏度测量,回压控制系统采用回压式位移量化控制系统精准控制回压,提高了毛细管黏度计测量的准确度和精度。在模拟油藏条件氮气黏度非常低,仅为0.018 mPa·s,而聚合物和泡沫体系毛细管黏度较高,分别为78 m Pa·s和126 m Pa·s。
