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| 1 | Approaches to High-grade Sintered Magnesia from Natural Magnesite显示文摘It is hard to manufacture high purity,dense sintered-magnesia from natural magnesite in the prevailing process of calcining and sintering,for two reasons:a)impurity,and b)low sintering activity of coarse-grained magnesite.In this paper,95%MgO magnesite was used as the starting material and finally magnesia of high density(3.47 g/cm^3)and high purity(98%MgO)was obtained after the flotation purification and a three-step sintering process.An industrial scale of the beneficiation system of natural magnesite was introduced for magnesite purification.In lab experimental,the three-step sintering process was implemented by calcining,hydrating,re-calcining and sintering,which has proven the possibility of densified magnesia from natural magnesite. | GUO Zongqi BI Deli MA Ying SUN Zhenlin | 2020 | China's Refractories2020，29，3： | 3 |
| 2 | Differences in purinergic and voltage-dependent signalling during protein kinase Calpha overexpression-and culturing-induced differentiation of C2C12 myoblasts 显示文摘 | Deli T Toth BI Czifra G | 2006 | J Muscle Res Cell Motil2006，27，8： | 1 |
| 3 | The extending length calculation of hydraulic drive non-metallic completion screen pipe running into ultra-short radius horizontal well显示文摘Focusing on the extending length restriction of the completion screen pipe resistance running into ultra-short radius horizontal well,this paper proposed technology of hydraulic drive completion tubular string running into ultra-short radius horizontal well.Innovative hydraulic drive tools and string structure are designed,which are composed of guide tubing,hydraulic drive tubing and non-metallic completion screen pipe from inside to outside.A novel mechanical-hydraulic coupling model is established.Based on the wellbore structure of an ultra-short radius horizontal well for deep coalbed methane,the numerical calculations of force and hydraulic load on tubular strings were accomplished by the mechanical-hydraulic coupling model.The results show that the extending length of completion tubular string with the hydraulic drive is 17 times that of conventional completion technology under the same conditions.The multi-factor orthogonal design is adopted to analyze the numerical calculations,and the results show that the extending length of the completion tubular string is mainly affected by the completion tubular string structure and the friction coefficient between the non-metallic composite continuous screen pipe and the wellbore.Two series of hydraulic drive completion tubular string structures suitable for ultra-short radius horizontal wells under different conditions are optimized,with the extending limits of 381 m and 655 m,respectively.These researches will provide theoretical guidance for design and control of hydraulic drive non-metallic composite continuous completion screen pipe running into ultra-short radius horizontal wells. | BI Yansen XIAN Baoan SHI Xiaolei GAO Deli | 2022 | Petroleum Exploration and Development2022，49，4： | 0 |
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