以丙烯酰胺、N,N'-亚甲基双丙烯酰胺、N-乙烯基吡咯烷酮、十六烷基二甲基烯丙基氯化铵为聚合单体,通过自由基引发进行不规则共聚合成一种清洁的CO_2泡沫压裂液稠化剂。该稠化剂能够在饱和CO_2酸性水溶液环境中溶解,溶液黏弹性好,并...以丙烯酰胺、N,N'-亚甲基双丙烯酰胺、N-乙烯基吡咯烷酮、十六烷基二甲基烯丙基氯化铵为聚合单体,通过自由基引发进行不规则共聚合成一种清洁的CO_2泡沫压裂液稠化剂。该稠化剂能够在饱和CO_2酸性水溶液环境中溶解,溶液黏弹性好,并具有良好的抗温、耐剪切性能。由质量分数为0.4%的该稠化剂配制的压裂液在120℃、170 s-1条件下的黏度保持在60 m Pa·s以上。同时研究发现,由该稠化剂配合起泡剂配制的清洁CO_2泡沫压裂液具有良好的泡沫稳定性,半衰期可达到96 h,并且破胶彻底,残渣质量分数低。在中原油田的现场应用表明,利用该稠化剂配制的清洁CO_2泡沫压裂液进行施工,增产效果明显。展开更多
Foam fracturing is an important technology in the development of low permeability oil/gas reservoirs. The heat transfer characteristics of foam fracturing fluid are directly relevant to the calculation of pressure dro...Foam fracturing is an important technology in the development of low permeability oil/gas reservoirs. The heat transfer characteristics of foam fracturing fluid are directly relevant to the calculation of pressure drop in the well, the optimum choice of fracturing parameters and the accurate evaluation of fracturing results. CO 2 foam fracturing fluid behaves as a non-Newtonian fluid. The convective heat transfer characteristics of CO 2 foam fracturing fluid were experimentally investigated on the newly constructed large-scale test loop under downhole conditions with CO 2 in supercritical state, the pressure up to 40 MPa. From the test data, corresponding correlations for convective heat transfer were obtained and the influences of pressure, temperature and flow rate were also studied. The convective heat transfer coefficient increased with the increase of temperature and flow rate, while the effect of pressure was much more complicated.In most cases, with the increase of pressure the coefficient tended to decrease.展开更多
文摘以丙烯酰胺、N,N'-亚甲基双丙烯酰胺、N-乙烯基吡咯烷酮、十六烷基二甲基烯丙基氯化铵为聚合单体,通过自由基引发进行不规则共聚合成一种清洁的CO_2泡沫压裂液稠化剂。该稠化剂能够在饱和CO_2酸性水溶液环境中溶解,溶液黏弹性好,并具有良好的抗温、耐剪切性能。由质量分数为0.4%的该稠化剂配制的压裂液在120℃、170 s-1条件下的黏度保持在60 m Pa·s以上。同时研究发现,由该稠化剂配合起泡剂配制的清洁CO_2泡沫压裂液具有良好的泡沫稳定性,半衰期可达到96 h,并且破胶彻底,残渣质量分数低。在中原油田的现场应用表明,利用该稠化剂配制的清洁CO_2泡沫压裂液进行施工,增产效果明显。
文摘Foam fracturing is an important technology in the development of low permeability oil/gas reservoirs. The heat transfer characteristics of foam fracturing fluid are directly relevant to the calculation of pressure drop in the well, the optimum choice of fracturing parameters and the accurate evaluation of fracturing results. CO 2 foam fracturing fluid behaves as a non-Newtonian fluid. The convective heat transfer characteristics of CO 2 foam fracturing fluid were experimentally investigated on the newly constructed large-scale test loop under downhole conditions with CO 2 in supercritical state, the pressure up to 40 MPa. From the test data, corresponding correlations for convective heat transfer were obtained and the influences of pressure, temperature and flow rate were also studied. The convective heat transfer coefficient increased with the increase of temperature and flow rate, while the effect of pressure was much more complicated.In most cases, with the increase of pressure the coefficient tended to decrease.
