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NUMERICAL SIMULATION OF TRANSIENT CUTTINGS TRANSPORT WITH FOAM FLUID IN HORIZONTAL WELLBORE

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Journal of Hydrodynamics 2009年第4期21卷 437-444页

作者： WANG Rui-he CHENG Rong-chao WANG Hai-ge BU Yu-huan College of petroleum Engineering China University of Petroleum Dongying 257061 China CNPC Drilling research Institute Beijing 100195 China

With considering the interlayer mass transfer and fluid influx from the reservoir, a one-dimensional two-layer hydraulic model was established to describe the mechanism of transient cuttings transport with foam fluid in horizontal well section. The model was numerically calculated based on the modified SIMPLE algorithm, and the height of cuttings bed was predicted by the trial-and-error method. Sensitivity analysis was conducted on the affecting factors on the cuttings transport performance. Results show that cuttings deposition moves along the horizontal wellbore from the drilling bit, and finally achieves a steady state with dynamic balance. Dimensionless cuttings bed height decreases with the increase of foam quality or foam flow rate, but increases with the increase of drillpipe eccentricity, cuttings size or drilling rate. The influx of water and gas from the reservoir is helpful to improve the cuttings transport efficiency with foam. The proposed model offers theoretical guidelines for hydraulic parameter design and hole cleaning control in foamed horizontal drilling.

关键词： foam fluid horizontal wellbore drilled cuttings theoretical model numerical simulation

Thresholds of geographic environmental elements in sediment yield of drainage basins

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Science china Earth Sciences 2005年第2期48卷 230-240页

作者： CHEN Hao, ZHOU Jinxing, CAI Qiangguo, LU Zhongchen & LI Zhongyan Institute of Geographic Sciences and Natural Resources research, Chinese Academy of Sciences, beijing 100101, china Institute of Forestry Science, Chinese Academy of Forestry Science, beijing 100091, china research center for Eco-Environment Sciences, Chinese Academy of Sciences, beijing 100085, china Computing Institute of Science and Engineering, North china Electric Power university, beijing 102206, china 1. Institute of Geographic Sciences and Natural Resources research Chinese Academy of Sciences 100101 Beijing China 2. Institute of Forestry Science Chinese Academy of Forestry Science 100091 Beijing China 3. research center for Eco-Environment Sciences Chinese Academy of Sciences 100085 Beijing China 4. Computing Institute of Science and Engineering North China Electric Power University 102206 Beijing China

Threshold of environmental elements in drainage basin sediment yield refers to, under effect of climate, underlying surface and human activity, a turning point of abrupt changes in drainage sediment yield related to environmental element characteristics. Previous studies on threshold of sediment yield of relevant drainage basins were mainly concentrated on impact of natural zones with a few researches on impact of other environmental elements. Particularly studies on compound environmental element threshold in drainage basin sediment yield remain blank today. Studies indicate that sediment yield in drainage basins is affected by compound interactions and complex actions. Based on single element analysis, the present paper gives quantitatively compound threshold of environmental elements affecting sediment yield of the drainage basin between Hekouzhen and Tongguan in the middle Yellow River by the method of multi-variant, polynomial formula regression analysis.

关键词： middle Yellow River, environmental element, sediment, sediment delivery mudule, threshold.

Late stage thermal history of the Songliao basin and its tectonic implications: Evidence from apatite fission track (AFT) analyses

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Science china Earth Sciences 2007年第10期50卷 1479-1487页

作者： XIANG CaiFu1,2?, FENG ZhiQiang3, PANG XiongQi1,2, WU HeYong3 & LI JunHong1,2 1 basin and reservoir research center, china university of petroleum, beijing 102249, china 2 Key Laboratory for Hydrocarbon Accumulation in china university of petroleum, Ministry of Education, beijing 102249, china 3 Prospecting and Exploration Institute of Daqing Oil Field, Daqing 163458, china 1. basin and reservoir research center China University of Petroleum Beijing 102249 China 2. Ministry of Education Key Laboratory for Hydrocarbon Accumulation in China University of Petroleum Beijing 102249 China 3. Prospecting and Exploration Institute of Daqing Oil Field Daqing 163458 China

Apatite Fission Track (AFT) data from the Songliao basin indicates that the late stage tectonic movements in the Songliao basin have zoning in space and episodes in time. The late stage tectonic movements started from the east part of the basin and migrated westward. AFT ages in the east part of the basin are older than those in the west part of the basin, suggesting that the uplift occurred earlier in the east than in the west. The denudation thickness in the east part of the basin is significantly greater than that in the centre and west. The thermal history evolved two episodes of rapid cooling and subsequent slow cooling processes. Age-depth relationship derived from the AFT data indicates a four-episode denudation history. Further Monte Carlo random simulation of the AFT data reveals the four changing points of the thermal evolution at 65 Ma, 43.5 Ma, 28 Ma and 15 Ma, respectively. The uplifting and denudation rates from different episodes of evolution are proportional to the plate convergence rate. Based on the above analyses and the regional geologic background, it is concluded that the late stage thermal events in the Songliao basin are the far field response to the subduction of the Pacific Plate under the Eurasian Plate. The first episode of the rapid cooling probably started at the end of the Nenjiang Formation, climaxed at the end of the Cretaceous and ceased at the Late Eocene. The subsequent slow cooling lasts another 15 Ma. The first episode of the evolution is the far field response to the major episode of the Yanshan Movement and subsequent series of the tectonic reorganization, especially the directional change of the Pacific Movement and also the subduction of the Indian Plate underneath the Eurasian Plate. While the second episode of the evolution is the far field response to the extension and closure of the Sea of Japan. Extension led to the migration and converging of the mantle heat flow to the Sea of Japan and resulted in the rapid cooling of

关键词： apatite fission track, late stage tectonic movement, episodic movement, plate tectonics, Songliao basin

Distribution and Significance of Methyl Steranes in Bohai Bay basin,East china

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Distribution and Significance of Methyl Steranes in Bohai Ba...

Potential recoverable natural gas resources in china

作者： Li Sumei Pang Xiongqi lin Zhijun (basin & reservoir research center,university of petroleum,beijing 102249)

＜正＞1 INTRODUCTION Fossil steroids retain structural and isotopic characteristics inherited from precursor *** this view,they can be utilized in oil-source correlations and as indicators of organic source （Thomas e...

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petroleum Science 2008年第1期5卷 83-86页

作者： Liu Chenglin Zhu Jie Che Changbo Liu Guangd School of Resource and Information China University of Petroleum Beijing 102249 China Oil and Gas Resource Strategy research center of the Ministry of Land and resource Beijing China

Natural gas resources in china are abundant. The undiscovered recoverable natural gas resources in china are estimated to be 19.27 ×10^12 m^3. Natural gas is mainly distributed in the middle and west china and offshore areas of china. The Tarim basin, Sichuan basin, Ordos basin, East china Sea basin, Tsaidam basin, Yinggehai basin, and Qiongdongnan basin are the main gas-bearing basins. The natural gas resources are not distributed evenly and are under-explored in china. The deeper horizons in east china, foreland basins and craton paleo-uplifts in the middle and west china, and the offshore basins are the main exploration areas in the future.

关键词： Natural gas resources exploration area china

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坳陷湖盆坡折带特征及其对非构造圈闭的控制

石油学报 2004年第2期25卷 30-35页

作者：刘豪王英民王媛石油大学盆地与油藏研究中心石油天然气成藏机理教育部重点实验室北京102249 石油天然气成藏机理教育部重点实验室

对准噶尔盆地西北缘地区侏罗系层序地层学的研究表明 ,在该地区发育多级坡折带。按其成因机制可分为断裂和挠曲坡折带 ,根据自然地理位置又可将坡折带分为盆缘坡折带和盆内坡折带两大类。构造运动是坡折带发育的主控因素 ,而且其规模与... 详细信息

对准噶尔盆地西北缘地区侏罗系层序地层学的研究表明 ,在该地区发育多级坡折带。按其成因机制可分为断裂和挠曲坡折带 ,根据自然地理位置又可将坡折带分为盆缘坡折带和盆内坡折带两大类。构造运动是坡折带发育的主控因素 ,而且其规模与构造运动大小相关。多级坡折带对非构造圈闭的控制主要表现为 :①非构造圈闭紧邻多级坡折带发育 ,沿着坡折带呈串珠状展布 ;②非构造圈闭在纵向上发育具有继承性 ;③非构造圈闭发育的类型随着坡折带和坡折带所处的地理位置的不同而有所不同 ;④同一个坡折带在横向上存在较大的变化 ,可形成不同类型的非构造圈闭 ;⑤多级坡折带的存在导致了在盆地的不同地理位置发生不同的沉积剥蚀响应 ,非构造圈闭的生、储、盖组合较好 ;

关键词：准噶尔盆地侏罗系坳陷湖盆层序地层学坡折带非构造圈闭

Reconstruction of precipitation variation from tree rings in recent 1000 years in Delingha, Qinghai

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Science china Earth Sciences 2005年第7期48卷 939-949页

作者： SHAO Xuemei1, HUANG Lei1, LIU Hongbin2, LIANG Eryuan1, FANG Xiuqi3 & WANG Lili1 1. Institute of Geographic Sciences and Natural Resources research, Chinese Academy of Sciences, beijing 100101, china 2. National Climate center, beijing 100081, china 3. beijing Normal university, beijing 100875, china Institute of Geographic Sciences Natural Resources Research Chinese Academy of Sciences Beijing 100101 China National Climate center Beijing 100081 China beijing Normal university Beijing 100875 China

Using seven well-replicated Qilian juniper (Sabina przewalskii Kom.) ring-width chronologies developed at Zongwulong and Shalike Mts. in the northeastern part of the Qaidam basin annual precipitation from previous July to current June in the recent 1000 years was re- constructed for Delingha. The reconstruction can capture 63.1% of precipitation variance and the equation was stable over time. For the reconstructed precipitation, wet periods occurred in AD1520—1633 and 1933—2001, whereas dry intervals in 1429—1519 and 1634—1741. In ad- dition, the magnitude in precipitation variation was lower before 1430 with about 15 mm, but it increased to 30 mm during the period of 1430 to 1850. After 1850, the precipitation variance de- creased again. In contrast to the increase in temperature, a decrease in annual precipitation was evident since the 1990s. The agreement in low-frequency variation between the reconstruction and the glacier accumulation and particulate content in Dunde ice cores during the recent several hundred years suggested that the precipitation reconstructed in this study was rather reliable, and represented a regional signal. This 1000-year reconstruction could benefit our understanding of climatic variation in decadal to century-scale in this region, and provide basic data to climate models and to prediction of future climate in the 21st century.

关键词： northeastern part of the Qaidam basin tree-ring width series of Qilian juniper precipitation reconstruction in 1000 years.

Abnormal high pressure in Kuqa foreland thrust belt of Tarim basin: Origin and impacts on hydrocarbon accumulation

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Progress in Natural Science:Materials International 2006年第12期16卷 1307-1314页

作者： ZENG Lianbo~1** and LIU Benming~ 1,2 (1. Key Laboratory of Hydrocarbon Accumulation in china petroleum university, Ministry of Education, beijing 102249, china 2. The Institute of Oil and Gas Exploration and Development, Tarim Oilfield Company, Petrochina Company Limited, Korla 841000, china) [a]Ministry of Education Key Laboratory of Hydrocarbon Accumulation in China Petroleum University Beijing China [b]The Institute of Oil and Gas Exploration and Development Tarim Oilfield Company PetroChina Company Limited Korla China

Following analyses of the abnormal high pressure distribution characteristics, based on the geological characteristics, tectonic stress field and physical simulation, we investigated the formation mechanisms of abnormal high pressure and its impacts on hydrocarbon accumulation in the Kuqa foreland thrust belt. The abnormal high pressure appears at the bottom of the Paleogene and obviously exists in the Triassic and Jurassic. However, the pressure coefficient in the Triassic and Jurassic is lower than that in the Cretaceous and at the bottom of the Paleogene. Horizontally, the abnormal high pressure distribution is characterized by E-W orientation zoning. The maximum pressure coefficient lies in the Kelasu-Dongqiu-Dina tectonic zones in the center of the Kuqa foreland thrust belt and decreases away from the tectonic zones. The formation of abnormal high pressure was mainly related with the intense tectonic compression in the Early Pleistocene time, and tectonic uplifting, undercompaction and hydrocarbon generation were secondary factors contributing to abnormal high pressure. Under the rapid and intense tectonic compression in the Early Pleistocene, the rock framework firstly undertook 1/4 of the compression stress and the other was borne by the pore fluids. Due to the presence of great seal of gypsum-salt or gypsum-mudstone beds in the Paleogene, the pressure of pore fluids increased rapidly and led to the abnormal high pressure in the Kuqa foreland thrust belt. The abnormal high pressure has important impacts on hydrocarbon accumulation. It is one of the necessary conditions for formation of large oil and gas fields in the Kuqa foreland thrust belt.

关键词： abnormal high pressure formation mechanism oil and gas reservoir Kuqa foreland thrust belt Tarim basin.

Southeastern extension of the Red River fault zone (RRFZ) and its tectonic evolution significance in western South china Sea

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Science china Earth Sciences 2006年第8期49卷 839-850页

作者： LIU Baoming1,2,3, XIA Bin1, LI Xuxuan1,3, ZHANG Minqiang1,3, NIU Binhua2, ZHONG Lifeng1, JIN Qinghuan1,4 & JI Shaocheng1,5 1. Key Laboratory of Marginal Sea Geology and Resources, Chinese Academy of Sciences,Guangzhou 510640, china 2. china university of Geosciences (beijing), beijing 100083, china 3. research center of Science & Technology Department, CNOOC, beijing 100027, china 4. Guangzhou Marine Geological Survey, Ministry of Land & Resources, Guangzhou 510075, china 5. Ecole Polytechnique Montreal, H3C3A7, Canada 1. Key Laboratory of Marginal Sea Geology and Resources Chinese Academy of Sciences Guangzhou 510640 China 2. china university of Geosciences (beijing) Beijing 100083 China 3. research center of Science & Technology Department CNOOC Beijing 100027 China 4. Guangzhou Marine Geological Survey Ministry of Land & Resources Guangzhou 510075 China 5. Ecole Polytechnique Montreal H3C3A7 Canada

Recent geophysical surveys and basin modeling suggest that the No.1 fault in the Ying- gehai basin (YGHB) is the seaward elongation of the Red River fault zone (RRFZ) in the South china Sea (SCS). The RRFZ, which separates the South china and Indochina block, extends first along the Yuedong fault, offshore of Vietnam, and then continues southward and breaks off into two branches: the Lupar fault and the Tinjia fault. The southern extension of the Lupar fault dies out beneath the NW Borneo while the Tinjia fault extends southeast and reaches the Brunei-Sabah area. According to the gravity and geomagnetic data, and the tectonic evolution of the basins, there are different evolution histories between the Wan’an basin (WAB) and the basins in the Nansha block. The Tinjia fault may be the boundary between the Balingian block and the Nansha block. Hence, the line linking the Yue- dong fault and the Tinjia fault, which both are continental margin faults and strike-slip ones in the geological evolution histories, constitute the boundary between the Indochina and Nansha block. The Lupar fault, in contrast, is an intraplate fault within the Indochina block. The results provide new hints for reconstructing the tectonic evolution history of the RRFZ and the opening of the SCS, and also a framework for hydrocarbon prospecting in the region.

关键词： Red River fault zone, tectonic evolution, fault, extension, western South china Sea.