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  hollow spheres
New approaches to stimuli-responsive polymeric micelles and hollow spheres
      
This article briefly describes some new approaches to stimuli-sensitive polymeric micelles and hollow spheres, which were developed in the authors' laboratory in recent years.
      
Hollow spheres of PNIPAM network were then obtained by biodegradation of the PCL core.
      
Both the core-shell spheres and hollow spheres show reversible size dependence on temperature change because of the phase transition of PNIPAM around 32°C.
      
(3) Complexation-induced micellization and transition between the micelles and hollow spheres.
      
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>=Hollow sphere dual gradient drilling is a new deepwater drilling technology, which is developed by Maurer technology inc. With the hollow-sphere dual-gradient drilling system, the mud and hollow spheres (glass, plastic, composite, metal, etc.) are mixed together at the surface, pumped to the seafloor as a slurry and injected into the riser to reduce the density of the mud in the riser to that of seawater. A major advantage of this system is that no new equipment is needed on the seafloor except a remotely...

>=Hollow sphere dual gradient drilling is a new deepwater drilling technology, which is developed by Maurer technology inc. With the hollow-sphere dual-gradient drilling system, the mud and hollow spheres (glass, plastic, composite, metal, etc.) are mixed together at the surface, pumped to the seafloor as a slurry and injected into the riser to reduce the density of the mud in the riser to that of seawater. A major advantage of this system is that no new equipment is needed on the seafloor except a remotely controlled valve. This paper introduces working principle and running process of hollow sphere dual gradient drilling system simply. The research content and development direction for deepwater hollow sphere dual gradient drilling technology are also outlined and discussed.

空心球双梯度钻井是由Maurer公司研发的一种新型深水钻井技术。在空心球双梯度钻井系统中,泥浆和空心球在钻井平台上混合并泵送到海底注入隔水管内稀释管内泥浆密度与海水相当,以实现双梯度钻井的目的。其中空心球材料可以是玻璃,塑料,复合材料,金属等。该系统的主要优点是除了在海底安装一个控制阀门之外,不需要增加其它新设备。本文简要介绍空心球双梯度钻井系统的工作原理和工艺流程, 以及空心球注入、分离等关键技术,并对该技术的应用前景作了展望。

 
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