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Application of wellhead suction anchor technology in the second production test of natural gas hydrates in the South China Sea

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China Geology 2022年第2期5卷 293-299页

作者： Bo Li Bei-bei Kou Bin Li Jing Li Jing Zeng Qing-lei Niu Yu-tao Shao Ke-wei Zhang Hao-yu Yu Ying-sheng Wang Guangzhou Marine Geological Survey China Geological SurveyGuangzhou 510075China National Engineering Research Center of Gas Hydrate Exploration and Development Guangzhou 510075China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Institute of Exploration Techniques China Academy of Geological SciencesLangfang 065000China

Traditional suction anchor technology is mainly used in the fields of subsea structure bearing foundations,single-point mooring systems and offshore wind *** is characterized by providing sufficient lateral and vertical bearing capacities and lateral bending *** anchor structure of a traditional suction anchor structure is improved with wellhead suction anchor technology,where a central pipe is added as a channel for drilling and completion *** solve the technical problems of a low wellhead bearing capacity,shallow built-up depth,and limited application of conductor jetting in the second production test of natural gas hydrates(NGHs)in the South China Sea(SCS),the China Geological Survey(CGS)took the lead in independently designing and manufacturing a wellhead suction anchor,which fulfilled the requirements of the production *** novel anchor was successfully implemented in the second production test for the first time,providing a stable wellhead foundation for the success of the second production test of NGHs in the SCS.

关键词： Wellhead suction anchor Conductor jetting Marine NGHs production test NGHs exploration trial engineering Oil and gas exploration engineering South China Sea

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Borehole stability in naturally fractured reservoirs luring production tests

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Petroleum Science 2008年第3期5卷 247-250页

作者： Zhang Fuxiang Zhang Shaoli Jiang Xuehai Lu Rende Chen Mian Tarim Oil Field Company PetroChina Korla Xinjiang 834000 China PetroChina Company Limited Beijing 100011 China School of Petrnleuln Engineering China University of Petroleum Beijing 102249 China

Based on the plane of weakness theory, a model for predicting borehole stability in fractured reservoirs under different stress states was estiblisted and the equations for solving borehole stability were developed. The minimum downhole pressures required to maintain borehole stability under different natural fracture occurrences were calculated by using the data from a well in the Tazhong （central Tarim） area, Tarim Basin, west China. Several conclusions were drawn for naturally fractured reservoirs with a dip angle from less than 10° to greater than 30°. Application in three wells in the Tazhong area indicates that this model is practically useful.

关键词： production test fractured reservoir borehole stability fracture dip azimuth of fracture

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