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《Natural Gas Industry》 2008-07
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WANG Duo-jin,ZHANG Kun,HUANG Ping,LI Jia-long,LI Hong-xing(CNPC Sichuan-Changqing Drilling & Exploration Corporation).  
The gas zones at Jia-2 formation in the Moxi gas field are characterized by high pressure,high permeability,and high H2S content.The polymer sulfonated drilling fluid was normally used to drill the φ152.4 mm interval of vertical or horizontal wells,with density ranging from 2.30 to 2.50 g/cm3.However,nearly in all those wells drilled there occurred differential sticking for more than once,and the drilling fluid was subject to contamination by the gypsum or thin inter-bedded rock salt,making rheology not easy to control,in addition to high pump pressure often resulted during drilling.Hence based on analysis of the causes of the sticking in high-density drilling fluid and the rheological causes of high pump pressure,a low oil/water ratio and oil-in-water drilling fluid system with extra-high density is developed.The sealing capability,oil wettability of filter cake,anti-gypsum capability of the rock samples of the payzone being studied have been evaluated in the lab.It has also been successfully used to drill the horizontal wellbore of the well Mo 005-H8.All demonstrate this system can be well used to satisfy the requirements of drilling in the Moxi gas field,largely decrease the torque during drilling and drill string drag during tripping,and effectively prevent differential sticking and high pump pressure problems.This system has advantages of easy rheological control when density is high,high capability to combat the gypsum contamination,little damage to pump elastomers,and being safe,and economically efficient.
【Fund】: 中国石油天然气集团公司重点科技项目“高效低成本钻井技术研究”的研究成果
【CateGory Index】: TE254.4
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