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Beijing, China

China National Offshore Oil Corporation, or CNOOC Group , is a major national oil company in China. It is the third-largest national oil company in the People's Republic of China, after CNPC and China Petrochemical Corporation . The CNOOC Group focuses on the exploitation, exploration and development of crude oil and natural gas in offshore China.The company is owned by the government of the People's Republic of China, and the State-Owned Assets Supervision and Administration Commission of the State Council assumes shareholder rights and obligations on the government's behalf. One subsidiary, CNOOC Limited, is listed on the Hong Kong exchange; the other, China Oilfield Services, is listed on the Hong Kong and New York exchanges. Wikipedia.


Su J.-F.,China National Offshore Oil Corporation
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

The power distribution network is connected by overhead line or cables, which makes it unreasonable sometimes to choose the ineffectively earthed mode in practical use. It doesn't improve the reliability of power supply, or even expands the fault area. The article analyzes connected modes and parameters of the neutral ungrounded, neutral grounded via arc-suppression coil and neutral grounded via high impedance power distribution network, as well as the capacitive current, short circuited current and over voltages in the normal system and single-phase fault system. It is proposed that the neutral ungrounded mode is adopted in the overhead line system when the grounded capacitive current is meeting the allowed value, while the arc-suppression grounded system is adopted when the current stands between the allowed value and 100 A. When the current is over 100 A, the high impedance grounded system is adopted. The proposed method can make good use of the advantages of ineffectively earthed system and improve the operation reliability of the network.


Zhu W.,China National Offshore Oil Corporation
Shiyou Xuebao/Acta Petrolei Sinica | Year: 2010

The deepwater area in the northern continental margin of South China Sea developed two types of sags in the Cenozoic. The first one is the large inherited rift-depression superposition sag that developed sediments of the rifting sequence, thermal subsidence sequence and Neo-tectonic sequence. The other one is the rifting sag that developed mainly sediments of the rifting sequence. The large inherited rift-depression superposition sag has three sets of Paleogene source rocks. The source rocks are the large scale mudstone that mainly generates natural gas. The chief reservoirs here are the shallow sea delta sandstone in the Oligocene and the low-stand fan sandstone in the Neogene. The regional marine mudstones are the regional cap rocks. The drape traps develop in the uplifts and low uplifts while the dome traps develop in the interior. Gas migrated vertically and radiantly from hydrocarbon-kitchen to adjacent structural ridges in Baiyun Sag of Pearl River Mouth Basin. The petroleum migrated and accumulated from the hydrocarbon-kitchen to the south in deepwater area of Qiongdongnan Basin. Abundant hydrocarbon source rocks, good migration conditions, lots of structural traps and favorable allocation in the deepwater area showed the great hydrocarbon exploration potential of the large inherited rift-depression superposition sag in the deepwater area. Compared with the large inherited rift-depression superposition sag, there are limited scale of the Paleogene source rocks and single trap type in the rifting sag. So the hydrocarbon exploration potential in this type of sag needs to be optimized.


Zhang G.,China National Offshore Oil Corporation
Shiyou Xuebao/Acta Petrolei Sinica | Year: 2010

The Cenozoic structure of the deepwater area in the northern South China Sea was generated under the condition of two times of basin expansion and short-term reconstruction in different directions of South China Sea and was also controlled by the actions of Honghe fault strike-slip and Philippine Plate extrusion. The tectonic evolution experienced the intracontinental rift period, intercontinental thermal subsidence period and neotectonic period of quasi-passive continental margin. In the intracontinental rift period, the basin structure was in the north-south sub-zone and east-west sub-section shape and then formed the basin-range extensional structure. In the intercontinental thermal subsidence period, the rift occurred in the current South China Sea, and the north edge of the rift was in the northern passive continental margin with regional thermal subsidence. Since the Late Miocene, the regional subsidence action occurred in the margin of South China Sea. The Indian Plate extrusion from the east part and Philippine Plate extrusion from the west part made the continental margin of the northern South China Sea keeping bidirectional extrusion status. So, two types of depressions exited in the east and west areas of the continental margin in the northern South China Sea. One is the half graben depression, and the other is the graben depression. The former includes North Reef Depression, Shunde Depression, Kaiping Depression and satellite depressions outside of Baiyun Depression, the latter includes Lingshui-Ledong Depression, Songnan-Baodao Depression and Baiyun Depression. Relative to the half graben depression, the three large graben depressions, with a wide sedimentary range and large subsidence, together constitute the deepwater area rich in oil and gas and may become a strategic replacement area for oil and gas of South China Sea.


Patent
China Oilfield Services Ltd. and China National Offshore Oil Corporation | Date: 2014-01-24

The present invention relates to an oil recovery process with composition-adjustable multi-component thermal fluid, the process comprises: adding oxygen produced by air together with fuel and water into a reactor, in which the oxygen and the fuel combust to produce flue gas and heat, the heat heats water to generate hot water/steam, and then the flue gas and the hot water/steam are mixed to form multi-component thermal fluid, wherein the purity of oxygen added into the reactor is controlled so as to produce the multi-component thermal fluid with various mass ratios of flue gas to hot water/steam; then the obtained multi-component thermal fluid with various mass ratios of flue gas to hot water/steam are injected into various types of oil reservoirs for oil recovery. The oil recovery process of the present invention is applicable for various types of crude oil reservoirs.


Patent
China Oilfield Services Ltd. and China National Offshore Oil Corporation | Date: 2013-10-29

The present application relates to a high temperature carbon dioxide corrosion inhibitor comprising the following components by mass percent: amide compound 1550%, organic alkynol 1025%, mercaptan acid 515%, piperidine 525%, mercaptopyridine 515%, and solvent 2560%. The corrosion inhibitor has excellent corrosion inhibition for CO

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