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One ∅127mm IEU G105 drill pipe body washed out infrequently just after 126h of pure drilling time. This paper gives a systematic analysis in consideration of material quality and loading condition on drill strings. Measurement and inspection were performed on configuration, chemical composition, mechanical performance, metallography and micro-fractography. It’s thought that the drill pipe washed out...
According to the features of airlift loading, first, a mathematical model for airlift loading is established in consideration of various realistic constraints such as centre of gravity, orientation, placing order, loading capacity and so on. Then, the airlift loading problem is solved by some key issues of tabu search are discussed, including encoding, decoding, evaluation function, neighborhood operation...
Consider heat conduction, convection, heat source, pipe cooler in the process of cement hydration; consider the elastic modulus of concrete, creep and shrinkage; study properties of concrete under the action of the water-reducing and set-retarding admixture and the expansive agent. Midas/Civil, one finite element analysis soft-ware, analyses mass concrete construction of the whole process of the temperature...
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