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special polymer
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    The solidification time of the super-fine cement is very short under the higher temperature because of its very small grain size,which makes water-plugging construction difficult to be controlled. For this reason,a special polymer solution is added to the super-fine cement. The various properties,especially usage safety,of the modified super-fine cement are greatly enhanced.
    针对超细水泥颗粒小、水化速度快、时间短,施工过程难以控制的问题,在超细水泥中添加特制的聚合物溶液对其进行复配改性,使得超细水泥的各种性能特别是安全性能大大提高.
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  special polymer
Studies of syntheses and permeabilities of special polymer membranes
      
Studies on syntheses and permeabilities of special polymer membranes
      
Studies on syntheses and permeabilities of special polymer membranes
      
Studies on syntheses and permeabilities of special polymer membranes
      
Studies on syntheses and permeabilities of special polymer membranes
      
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The reaction of SiO_2 with gaseous hydrogen fluoride differs from that with aqueous hydrofluoric acid. When the temperature is above 100℃, no reaction of SiO_2 with gaseous hydrogen fluoride is observed, but the reaction is accelerated when the surface of SiO_2 is coated by a special polymer film. On the basis of the results of our experiments, a mechanism is proposed in this paper to explain this phenomenon. In principal, the reaction of SiO_2 with gaseous HF is similar to that with aqueous HF. The controlling...

The reaction of SiO_2 with gaseous hydrogen fluoride differs from that with aqueous hydrofluoric acid. When the temperature is above 100℃, no reaction of SiO_2 with gaseous hydrogen fluoride is observed, but the reaction is accelerated when the surface of SiO_2 is coated by a special polymer film. On the basis of the results of our experiments, a mechanism is proposed in this paper to explain this phenomenon. In principal, the reaction of SiO_2 with gaseous HF is similar to that with aqueous HF. The controlling factor for both reactions is the formation of fluorine anion. At low temperature, the gaseous HF readily dissolves in the water layer on the surface of SiO_2 and dissociates to form fluorine anions and thus the reaction occurs. A high temperature, there is no water layer on the surface of SiO_2, the reaction takes place only in the presence of some compounds on the surface, which form H-bonds with HF and in turn assist the formation of fluorine anions. We call these compounds as accelerators. Mere the polymer film which contains accelerator can promote the reaction of coated SiO_2. Not only the polymer film acts as the carrier of accelerators, but also as a barrier preventing the escape of the accelerator.

二氧化硅与气相氟化氢的反应和与氢氟酸的反应不同,当温度高于100℃时,气相氟化氢与裸露的二氧化硅无明显反应,当二氧化硅表面涂上一层特殊聚合物膜时,反应可很快发生。本文在实验的基础上解释了这一具有应用价值的现象。认为在高温下二氧化硅与氟化氢反应需要有一种诱蚀剂存在,诱蚀剂—般为氢键接受体,水不是有效的诱蚀剂,聚合物膜是诱蚀剂的载体和防止诱蚀剂逃逸的栅栏。

Cement,being as early water plugging material,is widely applied in many oilfields in the world.The solidification time of the super-fine cement is very short under the higher temperature because of its very small grain size,which makes water-plugging construction difficult to be controlled.For this reason,a special polymer solution is added to the super-fine cement.The various properties,especially usage safety,of the modified super-fine cement are greatly enhanced.The experimental results show that,at...

Cement,being as early water plugging material,is widely applied in many oilfields in the world.The solidification time of the super-fine cement is very short under the higher temperature because of its very small grain size,which makes water-plugging construction difficult to be controlled.For this reason,a special polymer solution is added to the super-fine cement.The various properties,especially usage safety,of the modified super-fine cement are greatly enhanced.The experimental results show that,at the same temperature,the less the ratio of water to cement,the shorter the solidification time of the modified super-fine cement;at the same ratio of water to cement, the higher the construction temperature,the shorter the solidification time;the less the ratio of water to cement,the higher the strength of the solidified cement;the higher the construction temperature,the strength of the solidified cement in the same time.The water-plugging agent can safely used in wide temperature range(from room temperature to 130℃),and it has high plugging strength.It is used on more than 60 wells in Dagang Oilfield since 2003,and its construction success rate reaches to 100%,and good water-plugging results are obtained.

水泥作为最早的堵水材料在世界各油田被广泛应用.针对超细水泥颗粒小、水化速度快、时间短,施工过程难以控制的问题,在超细水泥中添加特制的聚合物溶液对其进行复配改性,使得超细水泥的各种性能特别是安全性能大大提高.实验结果表明:在相同温度下,水灰比减小,水泥固化时间缩短;在相同的水灰比下,温度升高,水泥固化时间缩短;水灰比越小,堵剂的强度越高;温度越高,在相同的时间内堵剂的强度越高.该堵剂适应地层温度范围宽(室温~130℃),使用安全,封堵强度高.从2003年开始在大港油田各个区块应用60多井次,施工成功率100%,取得了明显的应用效果.

 
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