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《Natural Gas Industry》 2012-08
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Application of China-made precise managed pressure drilling equipment in the Tarim Basin

Shi Lin1,Yang Xiongwen1,Zhou Yingcao1,Li Huaizhong2,Wang Ying1(1.CNPC Drilling Engineering and Technology Research Institute,Beijing 100195,China;2.Tazhong Project Management Department,Tarim Oilfield Company,PetroChina,Kurle,Xinjiang 841000,China)  
Managed pressure drilling(MPD) was and is still driven by the very narrow margins between formation pore pressure and formation fracture pressure downhole in the Ordovician carbonate reservoirs in the Tarim Basin.Regular drilling methods were always challenged by downhole complexity and frequent accidents and horizontal wells had to be completed earlier due to overflows or loss circulation.In view of this,aiming at the formation characteristics,drilling difficulties,and the application of MPD in this study area,this paper focuses on how the China-made MPD equipments have been applied there in terms of adaptability,countermeasures adopted,and final results achieved.A new record of drilling footage of 1476 m was set up in the TZ26-H7 well,with the footage in the horizontal section of 1345 m and the lateral displacement of 1647 m.Through the analysis of the drilling application in the horizontal sections of three wells in this study area,the following results are presented herein,First,the precise China-made MPD technology and equipment can be adaptable to the drilling needs for carbonate and fractured reservoirs,they are also beneficial to the discovery and protection of hydrocarbon in reservoirs,and are effective to mitigate the bad effect of such downhole complexity as overflows or lost circulation in the drilling operation,thereby to reduce the loss caused by non-operation time.Second,the properties and parameters of this domestic-made equipment have reached or surpassed the international advanced level of similar products.Third,this provides a technical means for safe drilling in the fractured oil and gas reservoirs by normal pressure fracturing treatment with a narrow density window.As a result,this domestic made precise MPD technology and equipment can be applied in commercial scale production of oil and gas fields.
【Fund】: 国家科技重大专项“窄密度窗口钻完井技术与装备”(2011ZX05021-03)部分研究内容
【CateGory Index】: TE242
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