Development of the artificial seabed technology and implementation pretrial well in the South China Sea

This paper introduces the recent highly significant activity of China Oilfield Services Ltd. （COSL） in the South China Sea, where COSL conducted pretrial drilling in June of 2008. The paper discusses some key research and new practices which led to the fabrication of related equipment which was evaluated in the trial. The market for deepwater drilling in the world has grown over the past 10 years but there are few drilling vessels or platforms suitable for drilling in deepwater or super deepwater. China needs equipment capable of deepwater drilling operations. COSL has some semisubmersible platforms, but they are only considered suitable for operations in water depths less than 475 m. An enabling technology, referred to as an artificial seabed, has been under development by COSL since 2004, and it applies the research results and experiences of many experts in deepwater drilling. COSL hopes this technology will allow drilling to depths of approximately 1 000-1 500m with its current platforms. The paper presents research progress and improvements in fabrication and necessary upgrades to equipment for extending deepwater drilling. The pretrial well was executed at a water depth of nearly 500m. COSL will drill the trial well around 2009 at the same location in the South China Sea.

关于高强中模碳纤维模量测试的研究

针对国内碳纤维拉伸模量的测试现状和国内外测试标准的区别,以国产QZ5526-12K聚丙烯腈(PAN)基碳纤维为研究对象,采用万能材料试验机比较了最大预载、应变范围、加载速度、引伸计标距和加强片等对模量测试的影响。结果表明,最大预载、应变范围和加强片等因素对拉伸模量的测试影响显著,而加载速度和引伸计标距等对拉伸模量的测试基本无影响。通过使用牛皮纸对固化后的纤维样条进行加强,当设置最大预载约为断裂载荷的10%、应变范围为0.1%~0.6%时,可以更加合理地表征高强中模碳纤维的模量。