The Development and Field Applications of Ultra-Deepwater Structural Conductor Jetting in Western South China Sea

2021 ◽  
Author(s):  
Zhong Li
Keyword(s):  
South China Sea ◽  
South China ◽  
Technical Problems ◽  
China Sea ◽  
Size Selection ◽  
Fracture Pressure ◽  
Successful Case ◽  
Pump Rate ◽  
Western South China Sea ◽  
Weight On Bit

Abstract Lingshui X-1 block is located in ultra-deepwater region in western South China Sea. Drilling in this area are encountering many technical problems, such as low temperature, poor lithology in shallow formation, low fracture pressure gradient, gas hydrate and shallow geological hazards, which bring great technical challenges to subsea wellhead stability (Yang et al., 2013). In order to ensure wellhead stability and improve top-hole operation efficiency, jetting technology was used for spud-in. First of all, carrying capacity curve of structural conductor was obtained from mechanics analysis of shallow seabed soil in Lingshui X-1 block. Secondly, structural conductor size selection and load analysis were carried out to determine safe setting depth of structural conductor in Lingshui X-1 block. Finally, bit stick-out, bit size selection, Weight on Bit (WOB) and pump rate were optimized on the basis of comprehensive analysis of ultra-deepwater under top-hole jetting technology and BHA characteristics. Well LSX-1-1 was taken as an example to illustrate field operation for top-hole jetting. This successful case of top-hole jetting technology in Lingshui X-1 block of western South China Sea could provide technical guidance for future drilling activity in similar ultra-deepwater wells.

VARIATIONS IN PALEOPRODUCTIVITY RECORDED BY BENTHIC. FORAMINIFERA DURING MIS 3 FROM THE WESTERN SOUTH CHINA SEA

2011 ◽  
Vol 31 (1) ◽  
pp. 85-92
Author(s):  
Yaocheng NIU ◽  
Yiyuan ZHANG ◽  
Jianghui DU ◽  
Mengsha CHEN ◽  
Baoqi HUANG
Keyword(s):  
South China Sea ◽  
South China ◽  
Benthic Foraminifera ◽  
China Sea ◽  
Mis 3 ◽  
Western South China Sea

scholarly journals Satellite observations of the small-scale cyclonic eddies in the western South China Sea

2014 ◽  
Vol 11 (9) ◽  
pp. 13515-13532
Author(s):  
F. Liu ◽  
S. Tang ◽  
C. Chen
Keyword(s):  
South China Sea ◽  
South China ◽  
Rotation Speed ◽  
Mesoscale Eddies ◽  
Small Scale ◽  
Western Boundary ◽  
Cold Tongue ◽  
China Sea ◽  
Western South China Sea ◽  
Offshore Transport

Abstract. High-resolution ocean color observation offers an opportunity to investigate the oceanic small-scale processes. In this study, The Medium Resolution Imaging Spectrometer (MERIS) daily 300 m data are used to study small-scale processes in the western South China Sea. It is indicated that the cyclonic eddies with horizontal scales of the order of 10 km are frequently observed during upwelling season of each year over 2004–2009. These small-scale eddies are generated in the vicinity of the southern front of the cold tongue, and then propagate eastward with a speed of approximately 12 cm s−1. This propagation speed is consistent with the velocity of the western boundary current. As a result, the small-scale eddies keep rotating high levels of the phytoplankton away from the coastal areas, resulting in the accumulation of phytoplankton in the interior of the eddies. The generation of the small-scale eddies may be associated with strengthening of the relative movement between the rotation speed of the anticylconic mesoscale eddies and the offshore transport. With the increases of the normalized rotation speed of the anticyclonic mesoscale eddies relative to the offshore transport, the offshore current become meander under the impacts of the anticyclonic mesoscale eddies. The meandered cold tongue and instability front may stimulate the generation of the small-scale eddies. Unidirectional uniform wind along cold tongue may also contribute to the formation of the small-scale eddies.

Sphaeromatidae (Crustacea : Isopoda : Flabellifera) from the South China Sea

1993 ◽  
Vol 7 (5) ◽  
pp. 1167 ◽  
Author(s):  
OG Kussakin ◽  
MV Malyutina
Keyword(s):  
New Species ◽  
South China Sea ◽  
South China ◽  
New Genus ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Western South China Sea

Collections of sphaeromatids from the northern and western South China Sea are reported. As a result of this study, the number of sphaeromatid species known from this sea has been more than tripled. Descriptions and illustrations of four new species (Dynoides harrisoni, Cerceis sinensis, Paracerceis holdichi and Paraleptosphaeroma brucei) from the South China Sea are presented, a new genus, Chitonosphaera, is erected for Gnorimosphaeroma lata Nishimura, 1968, and records are presented for a further 24 species.

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