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《Natural Gas Industry》 2013-01
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Drilling engineering difficulties in high-sulfur gas fields in Turkmenistan and countermeasures

Liu Chuansheng1,Zhou Shi1,Yan Ling2,Deng Shikui1(1.Overseas Project Division of CNPC Chuanqing Drilling Engineering Co.,Ltd.,Chengdu,Sichuan 610041,China;2.CNPC Chuanqing Drilling Engineering Co.,Ltd.,Chengdu,Sichuan 610051,China)  
The Amu Darya River Right Bank Gas Field is one of the major gas zones in Turkmenistan.In order to ensure a smooth implementation of the Natural Gas Supply Contract(300×108 m3) signed between the Chinese government and the Turkmen government,we first made a deep investigation into the past prospecting and drilling as well as geological and engineering conditions in this contracted zone;then summarized the existing difficulties and risks for the operations;and focused on exploring the reasons for low drilling speed and well abandonment in this field.On this basis,we then proposed the rational wellbore configuration design and related well control mechanisms for a high yield,clarified existing geological engineering difficulties encountered respectively by each layer of casing,and finally worked out solutions to smooth out the engineering risks such as salt water encroachment,gypsum salt dissolution,hole shrinkage by gypsum salt,kicks,blowouts,and so on existing in the third and the fourth spud-in drilling operations.By applying the above countermeasures,we have set a new record in this field by successfully drilling a total of 48 wells from May,2008 to May,2012 with a success ratio of 100%,with no well abandoned,and with an average well construction period of 156.75 days and the average penetration rate of 3.17 m/h;the most important of all,a full set of drilling techniques have been formed suitable for the high temperature and high pressure gas wells with a high sulfur content in the Amu Darya River Right Bank Gas Field.
【CateGory Index】: TE24
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