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《Natural Gas Industry》 2013-01
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The integrity management technology and application of high-sulfur gas wells in the Longgang Gas Field,Sichuan Basin

Ma Faming1,She Chaoyi1,Guo Jianhua1,2(1.Gas Production Engineering Research Institute of Southwest Oil & Gasfield Company,PetroChina,Guanghan,Sichuan 618300,China;2.Southwest Petroleum University,Chengdu,Sichuan 610500,China)  
In recent years,there are more and more high sour gas wells,but due to flaws in technology and operation,unusual occurrence such as the abnormal annular pressure will badly influence the safe production of such wells.In view of this,based on the in-detailed explanation of the concept of advanced integrity management at home and abroad,this paper first analyzes the characteristics of the Longgang Gas Field,Sichuan Basin,such as high temperature(130-150℃),ultra depth(6200 m),high sulfur content(30-156 g/m3) and complex geological condition.On this basis,the research and application of the integrity management for gas wells is conducted in the aspects of reason analysis of abnormal annular pressure,content and workflow of borehole safety assessment,risk level classification,and prevention and controlling methods.Accordingly,the following corresponding countermeasures are laid out for the integrity management of gas wells.(1) As for those completed mature wells,the follow-up evaluation analysis of downhole pressure and fluids should be made,while downhole and wellhead corrosion should be supervised and inspected as well and the downhole safety should be regularly assessed and guaranteed.(2) As for those new wells to be completed,high attention should be paid to casing program design,completion string design,quality control of field operation,etc.,in order to avoid the occurrence of abnormal annular pressure in wells.The field application shows that the said integrity management for gas wells and the above countermeasures can completely meet the requirement for safe production of the Longgang Gas Field.
【Fund】: 国家示范工程“四川龙岗地区大型碳酸盐岩气田开发示范工程”(编号:2011ZX05047);; 国家科技重大专项“复杂碳酸盐岩气藏开发技术”(编号:2011ZX05015-003)
【CateGory Index】: TE37
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