Evaluation method for Green jack-up drilling platform design scheme based on improved grey correlation analysis     

《Applied Ocean Research》2019

This paper presents an evaluation method for green jack-up drilling platform(GJDP) design scheme based on the improved grey correlation analysis(IGCA). Under the situation of the low-carbon economy it is important and complicated for jack-up drilling platform design to select the optimum design scheme from the feasible schemes. In this paper, the evaluation index system for GJDP has been proposed which includes 3 factors: advanced technology, economic feasibility and environmental coordination, as well as 13 sub-indices. At the same time, a multi-objective combinatorial optimization model is established by using IGCA, in which the analysis hierarchy process (AHP) is used to obtain the weight values of the indices. The IGCA method is fully considered the connection of the indices reflecting the objective true nature of the things, and the subjective interest of the platform owner and the needs of the designer. This research can not only conduct to green design of jack-up drilling platform, but also can contribute to the development, popularization and application of low-carbon technology on offshore platform. Finally, the case study results demonstrate the feasibility and efficiency of the proposed evaluation method.  相似文献   

深水钻井液研究与评价模拟实验装置     

徐加放  邱正松 《海洋地质译丛》2010,(3):88-92

分析了我国深水钻井的现状和未来发展趋势,调研分析了深水钻井所面临的困难和深水钻井液必须具备的基本性能。在理论推导并结合实践的基础上,研制了深水低温钻井液基本性能模拟实验装置、深水钻井液水合物生成与抑制评价实验装置以及深水钻井液循环与井壁稳定模拟实验装置等,并对模拟装置的实验可行性和平行性进行了验证。实验结果表明,新研制模拟实验装置控制精度较高、实验平行性较好,能够满足深水钻井液性能测定与评价的基本要求,为我国深水钻井液技术研究奠定了一定的室内实验研究基础。  相似文献   

高平4水平井组双保钻井液技术     

胡祖彪  骆胜伟  孟凡金  陈秉炜  石仲元  金虎 《海洋地质译丛》2009,(1):110-115

高平4井组水平井主要用于开发安塞长10组油藏。针对该井组上部直罗组和富县组易坍塌、下部地层钻速相对较慢、地层易造浆的特点，研究应用了环保型聚硅酸盐-黄胞胶钻井液体系。该体系具有抑制性强、润滑和剪切稀释性好的特点，有利于安全快速钻井，对环境污染极小。通过小型配浆实验确定钻井液施工方案，中测后稀释钻井液，降低钻井液滤失量和密度，加强固相控制，使用保护油层的酸溶性暂堵剂和降滤失剂，可最大限度地保护油层。  相似文献   

Field observations in a small subtropical estuary during and after a rainstorm event     

Hubert Chanson 《Estuarine, Coastal and Shelf Science》2008

In Australia, a large majority of small subtropical estuaries are narrow, elongated and meandering channels with large width to depth ratio and cross-sections which deepen and widen towards the mouth. Up to date, episodic rainstorm events in such small systems were rarely documented, and this study presents a field data set collected during and immediately after a rainstorm. A number of hydrodynamic and physio-chemical parameters were recorded simultaneously at several longitudinal locations for 12 h. The field measurements demonstrated a significant flushing of the estuarine zone, caused primarily by the rainfall runoff from the nearby shopping malls and roadways. Some strong vertical stratification of the water column was observed at all sampling locations, and the depth-averaged salinity data exhibited a dome-shaped intrusion curve. A solution of the salt dispersion equation provided some agreement with the freshwater flushing conditions during the wet weather.  相似文献   

Can sandy beach molluscs show an endogenously controlled circatidal migrating behaviour? Hints from a swash rig experiment   总被引：1，自引：0，他引：1  

Thomas Vanagt  Magda Vincx  & Steven Degraer 《Marine Ecology》2008,29(S1):118-125

Many macrofaunal species inhabiting exposed sandy beaches are dependent on the swash for their nutrition and migration and are highly adapted to the harsh physical conditions of the swash. The most important physical factors that determine the distribution and behaviour of swash related fauna, next to the swash itself, are sediment grain size and beach slope. Crucial swash parameters are swash period and swash velocity. Studying the influence of these factors on the animals in the field is often very difficult and it is almost impossible to identify which factor causes what effect. Crucial knowledge about the direct role of the swash itself is lacking. Therefore, a device that generates swash waves on an artificial beach under laboratory conditions was designed: the swash rig. In the swash rig, full and independent control on sediment grain size, beach slope, swash velocity and swash period is present. This will allow us to do a variety of experiments on the influence of each of these factors, independently or combined, on swash fauna. In one such experiment, Olivella semistriata – a dominant surfing gastropod on Ecuadorian sandy beaches – was placed in the swash rig during rising and falling tide and subjected – under constant conditions – to an equal wave regime. During falling tide, and in absence of any tidal cue, almost all specimens moved downshore, as they would in the field; hardly any specimens moved upshore. During upcoming tide, however, there was noticeable upward migration in the swash rig, and half of the runs showed a net upward migration. Contrary to the common understanding that the behaviour of sandy beach molluscs is entirely environmentally driven, this experiment hints at the presence of an endogenous circatidal clock, which is used to direct the tidal migration of the species.  相似文献   

加快岩土钻掘工程科技进步 推动勘察施工业更大发展     

石昆山 《河南国土资源》1999,(3)

本文回顾了河南地矿系统勘察施工业的形成与发展,概述了岩土钻掘工程技术领域的主要进展,指出了存在的突出矛盾和问题,分析了“九五”末和21世纪初勘察施工业面临的形势、机遇和挑战,提出了发展勘察施工业的对策和建议  相似文献   

华贵栉孔扇贝基础群体内大小分化个体的淀粉酶和纤维素酶活力比较   总被引：1，自引：0，他引：1  

邓岳文  王庆恒  黄荣莲  杜晓东 《海洋学研究》2008,26(2):37-40

在2006年3月,从湛江乌石养殖的华贵栉孔扇贝群体随机挑选100只个体作为亲本建立了基础群体。在2006年10月,从基础群体分别选择大、小个体构成两个子群体,比较了这两个子群体在不同温度时的淀粉酶和纤维素酶活力的差异。在20℃时,两个子群体的淀粉酶活力差异不显著(P>0.05);在25℃和30℃时,大个体子群体的淀粉酶活力显著大于小个体子群体的淀粉酶活力(P<0.05)。在20、25和30℃时,大个体子群体的纤维素酶活力显著大于小个体子群体的纤维素酶活力(P<0.05)。这些说明华贵栉孔扇贝的淀粉酶和纤维素酶活力与生长性状相一致。  相似文献   

Turbulence characteristics of a small subtropical estuary during and after some moderate rainfall   总被引：1，自引：0，他引：1  

Mark Trevethan  Hubert Chanson  Richard Brown 《Estuarine, Coastal and Shelf Science》2008,79(4):661-670

  相似文献   

Combining 2D-basin and structural modelling to constrain heat transport along the Muroto Transect,Nankai Trough,Japan     

Robert Ondrak  Christoph Gaedicke  Brian Horsfield 《Marine and Petroleum Geology》2009

The Nankai Trough located southeast of Shikoku Island, Japan, exhibits a zone of exceptionally high heat flow. In the central part of the Nankai Trough the fossil spreading centre of the Shikoku Basin is subducted beneath the southwest Japan arc. We have modelled the temperature and maturation history along the Muroto Transect reaching from the tip of the thrust zone out into nearly undeformed Quaternary and Tertiary sediments seawards of Nankai Trough. We used two balanced cross-sections defining the sections before and after overthrusting as input for 2D-basin modelling. We can show that rapid burial and overthrusting during the Quaternary in combination with a heat flow history following the cooling curve of a 15 Ma old oceanic plate is not sufficient to explain the measured maturity of organic material in the sediments. Several heat flow scenarios derived from theoretical concepts [Yamano, M., Kinoshita, M., Goto, S., Matsubayashi, O., 2003. Extremely high heat flow anomaly in the middle part of the Nankai Trough. Physics and Chemistry of the Earth, Parts A/B/C 28, 487–497.] and previous modelling approaches [e.g. Brown, K.M., Saffer, D.M., Bekins, B.A., 2001. Smectite diagenesis, pore water freshening, and fluid flow at the toe of the Nankai wedge. Earth and Planetary Science Letters 194, 97–109; Spinelli, G.A., Underwood, M.B., 2005. Modeling thermal history of subducting crust in Nankai Trough: constraints from in situ sediment temperature and diagenetic reaction progress. Geophysical Research Letters 32(L09301): doi:10.1029/2005GL022793; Steurer, J., Underwood, M.B., 2003. Clay mineralogy of mudstones from the Nankai Trough reference sites 1173 and 1177 and frontal accretionary prism site 1174. In: H. Mikada et al. (Eds.), pp. 1–37. Available from: <http://www-odp.tamu.edu/publications/190196SR/VOLUME/CHAPTERS/211.PDF>] were tested. The best match between observed maturity levels, temperature and heat flow measurements is reached for a heat flow history which initially assumes the cooling of a 15 Ma old oceanic lithosphere but is reheated to 170–180 mW/m² during the phase of rapid burial in the Quaternary. This can be achieved either by assuming the onset of hydrothermal circulation in the cooling crust or by reheating caused by off-axis volcanism at about 6 Ma [Yamano, M., Kinoshita, M., Goto, S., Matsubayashi, O., 2003. Extremely high heat flow anomaly in the middle part of the Nankai Trough. Physics and Chemistry of the Earth, Parts A/B/C 28, 487–497.].  相似文献   

小排列高分辨多道地震系统在岱山岛大桥工程中的应用     

张勇  田双凤  周建平  方斌 《海洋学研究》2008,26(4):105-110

对运用小排列高分辨多道地震系统获取的岱山岛大桥附近海域高精度的地震数据进行了综合分析和处理,查明了调查区域的工程地质条件,并对两个桥址方案进行了地质条件的对比。采用的地震系统参数:拖缆为24道,道间距为2 m,偏移距为46 m,枪容积为10 in3,频带范围为1~1 000Hz。结果表明:(1)采用了统一方法和流程对岱山岛大桥工程中所获得的地震数据进行分析、处理,保证了两种选址方案调查结果的一致性。(2)舟山本岛-岱西桥位(方案Ⅰ)和舟山本岛-双合山桥位(方案Ⅱ)海底地形平缓,不存在海底滑坡体等不良地质现象,调查区域虽分别有6条和5条断裂,但所有断层的上覆第四系均未发生错断,断裂均为非活动性断裂,两个方案桥位线均具有建桥的良好工程地质条件。(3)与单道地震相比,小排列高分辨多道地震系统能得到更为丰富的地层反射地震数据,而该系统比传统的多道反射地震方法具有作业方便、经济的优势,可见,该调查方法适用于近岸区域浅水工程环境的地质调查工作,是一种方便、实用和经济的地质调查手段。  相似文献