Narrow Results

After the discovery of carbon nanotubes (CNTs) by Sumio Iijima in 1991, several methods have been developed to synthesize them. High-temperature techniques, such as laser ablation and arc discharge, are now replaced by a low-temperature technique like chemical vapor deposition (CVD). Floating catalyst chemical vapor deposition (FCCVD) method is extensively researched due to its ease of fabrication, mass production at low cost and high purity output. The motive of this paper is to discuss the influence of three major factors on the growth of CNTs using the FCCVD method, which can help us better understand the process of FCCVD as well as the potential challenges faced by this method.

Most scholars have reached a consensus on this point that there is a very close relationship between the development characteristics and controlling factors of fractures and gas accumulation. Thus, the study of volcanic fracture characteristics and controlling factors is significant. We selected Xujiaweizi fault depression Yingcheng as the study area. There are many pores and primary fractures in the volcanic reservoirs of Yingcheng Formation in the Xujiaweizi fault depression, but the connectivity is very poor. The development degree of tectonic fractures determines the reservoir quality and probability of hydrocarbon accumulation. In order to illuminate the relationship between fractures and natural gas accumulation, using data of cores, image logs and experimental analysis, researches are conducted firstly on the fracture genetic types, characteristics, controlling factors. Among them, secondary tectonic fractures are dominant. The distribution of tectonic fractures is controlled by lithology, lithofacies and fault in the plane, while cyclicity exists in the longitudinal direction which is controlled by unconformity.

As an effective technology in enhancing oil recovery in low permeability reservoirs, CO₂ flooding has been playing an increasingly important role in world energy exploration. However, serious gas channeling is one of the direct restrictions to oil production. To improve the research of controlling factors and their influence of CO₂ channeling, we will present a geology model according typical low permeability reservoir, which include the influence rules to gas channeling, gas channeling-path dart-coefficient, thickness and type will be analyzed respectively.

Gao7 block in Gaoji oilfield has been entered in three higher stages: high water cut, high recovery and high dispersion degree of the remaining oil. The long history of oil exploration and great variation of the well condition have made the distribution of remaining oil scattered and the relation between oil and water complicated. Oil production is becoming more and more inefficient. The distribution of the remaining oil is specifically studied in order to improve the recovery ratio. An adjustment measures have been put into operation. The study shows that the remaining oil mainly controlled by the faults, the micro structural high and imperfect injection patterns. The prediction result shows that these measures play the effect of increasing oil and reducing water, and improve the efficiency of water flooding.

After the discovery of carbon nanotubes (CNTs) by Sumio Iijima in 1991, several methods have been developed to synthesize them. High-temperature techniques, such as laser ablation and arc discharge, are now replaced by a low-temperature technique like chemical vapor deposition (CVD). Floating catalyst chemical vapor deposition (FCCVD) method is extensively researched due to its ease of fabrication, mass production at low cost and high purity output. The motive of this paper is to discuss the influence of three major factors on the growth of CNTs using the FCCVD method, which can help us better understand the process of FCCVD as well as the potential challenges faced by this method.