scholarly journals Interference analysis and operability envelopes design for deepwater parallel strings

2019 ◽  
Vol 74 ◽  
pp. 71
Author(s):  
Jingyu Zhu ◽  
Kang Liu ◽  
Guoming Chen ◽  
Gaogeng Zhu
Keyword(s):  
Oil And Gas ◽  
Surface Current ◽  
Field Development ◽  
Oil And Gas Exploration ◽  
Wake Model ◽  
Offshore Oil And Gas ◽  
Offshore Oil ◽  
Wake Fields ◽  
Shielding Effects

Dual derrick operations are widely used for field development during offshore drilling. During this process, complex operations and complicated hydrodynamic interaction may contribute to the interference collisions of parallel strings. In this context, this study addresses interference collisions for parallel strings during the deepwater dual derrick operation. To analyze the response of parallel strings a mechanical model for deepwater parallel strings is established. Moreover, Huse wake model and strip model are used for calculating the hydrodynamic influence in different wake fields. The research results validate that the collision will occur during the operation considering the hydrodynamic wake shielding effects and interference evaluation criterion. The increasing platform offsets and surface current are the leading causes of parallel strings collisions. To avoid the risk of interference collisions an innovative procedure for operability envelopes is developed by synthesizing the platform offsets and surface currents. The proposed operability envelopes method for parallel strings is automatically completed which can save much workforce and resources. A case study on deepwater drilling in the South China Sea has been applied to verify the effectiveness of these methods. Besides, the proposed methodology can effectively reduce collision accidents and provide technical support for the offshore oil and gas exploration.

The Adaptation of Rural Residents to the Offshore Oil and Gas (Exploration Phase) Labour Force, Newfoundland and Labrador, 1981

1983 ◽  
Vol 2 (S1) ◽  
pp. 133-139
Author(s):  
Richard Fuchs
Keyword(s):  
Newfoundland And Labrador ◽  
Oil And Gas ◽  
Labour Force ◽  
Oil Industry ◽  
Rural Residents ◽  
Oil And Gas Exploration ◽  
Number Of Factors ◽  
Offshore Oil And Gas ◽  
Offshore Oil ◽  
Exploration Phase

In response to interest and concerns about the effect which oil industry development would have in the province of Newfoundland, a number of studies were initiated, including attempts to assess the impacts on rural residents. An analysis of the offshore labour force indicated that Newfoundland residents represented 60% of the offshore force; however, their participation was predominantly in the junior drilling, junior marine and junior service positions. The provincial workers differed from the non-resident workers on a number of factors. Also of interest, the 35% of the Newfoundland workers interviewed had come from water transport occupations and were attracted by the perceived advantages of work in the oil industry, while the 34% who had come from the fishing industry, cited financial insecurity and poor working conditions of the fishery as their reasons for changing jobs.

OFFSHORE OIL AND GAS EXPLORATION: WHAT ARE THE ENVIRONMENTAL EFFECTS AND DO THEY JUSTIFY LIMITATIONS ON ACCESS TO COASTAL WATERS?

1989 ◽  
Vol 29 (1) ◽  
pp. 84
Author(s):  
R.P. Warren
Keyword(s):  
Oil Spill ◽  
Environmental Effects ◽  
Coastal Waters ◽  
Oil And Gas ◽  
Assessment Procedure ◽  
Seismic Surveys ◽  
Oil And Gas Exploration ◽  
Direct Exposure ◽  
Offshore Oil And Gas ◽  
Offshore Oil

A proposal to undertake exploration in the coastal waters adjacent to Sydney/Newcastle/Wollongong has brought strong protests on environmental grounds. This opposition is committed and the basis for it should be considered in the wider context of offshore exploration around Australia. Of the various activities involved in oil and gas exploration the potential impacts of marine seismic surveys and the likelihood of a blowout- related oil spill are those of greatest concern to the media and public.A review of the available literature shows the environmental effects of seismic surveys to be of little consequence provided non- explosive energy sources are used. The effects of an oil spill are heavily dependent on site conditions and the type of oil spilled.The literature shows that direct exposure to spilled oil is fatal to many marine species. However, the potential lethal effects are largely dependent on direct exposure and this declines with the weathering and degradation of the spill. Moreover, the risks of an oil spill occurring as a result of current transportation and handling of oil in coastal waters and points around Australia are much greater than would be presented by drilling an exploratory well.In considering the role of exploration as an assessment procedure rather than a land use it is possible to draw parallels between the conservation status of Australian coastal waters today and the onshore situation some 20 years ago. The offshore oil and gas exploration industry needs to take several measures if it is to avoid denial of access for exploration. These include clearly identifying the environmental effects of exploration as opposed to production, adopting industry- wide codes for environmental practice, and recording and disseminating the industry's environmental performance.

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