A natural gas hydrate downhole in-situ desanding device and desanding method for double-tube drilling
A technology of natural gas and double-layer pipes, which is applied in wellbore/well components, earthwork drilling, and production fluids, etc. It can solve the problems of sediment and hydrate cementation, achieve good results, and ensure safety and reliability.
Active Publication Date: 2022-03-25
EAST CHINA UNIV OF SCI & TECH
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[0005] The object of the present invention is to provide a natural gas hydrate self-rotating cement-breaking cyclone, which aims to solve the problem of sediment and hydrate cementation in the natural gas hydrate fluidized exploitation, and is used for double-layer pipe drilling. Hydrate downhole in-situ sand removal device and method
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[0030] The natural gas hydrate downhole in-situ sand removal device for double-tube drilling includes an inner cylinder 1 and an outer cylinder 2, and the outer cylinder 2 is fixed with an inner cylinder through a plurality of upper mounting blocks 3 and a plurality of lower mounting blocks 4 1. The diameter of the inner cylinder 1 is 50-500 mm, and the diameter of the outer cylinder 2 is 110-130% of the diameter of the inner cylinder 1. The inner cylinder 1 is provided with a bell mouth-shaped cone sleeve 5, which is integrated with the inner cylinder 1; the diameter of the bottom end of the cone sleeve 5 is 20-80% of the diameter of the inner cylinder 1, and the cone section of the cone sleeve 5 is connected to the inner cylinder 1. The angle between the horizontal plane is 10-40°.
[0031] The inner cylinder 1 under the taper sleeve 5 is fixed with an assembly plate 6, and the center of the assembly plate 6 is provided with a swirler, which is composed of an assembly column...
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The invention relates to a natural gas hydrate downhole in-situ sand removal device and a sand removal method for double-tube drilling, belonging to the technical field of natural gas hydrate gel breaking and sand removal. In the present invention, the inner cylinder and the outer cylinder form a double-layer pipe structure; during the working process, the axial flow of the mixed slurry is converted into a rotational flow through a cyclone, so that the cemented particles can use the centrifugal force generated by the rotation in the swirl field and The fluid shear force makes the natural gas hydrate and the sediment stripped, and then returns the natural gas hydrate to the offshore platform for human use, and backfills the sediment to the formation in situ. The present invention can ensure the safety and reliability of natural gas hydrate exploitation. At the same time, it not only provides separation conditions for liquid-solid two phases, but also has the advantages of particle sorting and swirl breaking cementation, which solves the problem of sediment and hydrate cementation in the existing natural gas hydrate fluidization production. And it has the characteristics of continuous mining, in-situ backfilling of mud and sand, and good effect of colloid-breaking, sand-removing and cyclone separation.
Description
technical field [0001] The invention relates to a natural gas hydrate downhole in-situ sand removal device and a sand removal method for double-tube drilling, belonging to the technical field of natural gas hydrate gel breaking and sand removal. Background technique [0002] Natural gas hydrate (Natural gas hydrate, NGH, also known as combustible ice) is a kind of clean energy with huge reserves. The exploration results show that the total amount of global NGH resources converted into methane is (1.8~2.1)×1016 m 3 , which is equivalent to twice the total amount of known energy sources such as coal, oil and natural gas in the world, and the reserves of seabed gas hydrates account for more than 99% of the total reserves. [0003] The existing subsea natural gas hydrate separation technologies mainly include gravity and cyclone centrifugal separation, which are mainly used in conventional offshore oil and gas production. In 2001, Statoil Company put into production the world's...
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IPC IPC(8): E21B43/40
CPCE21B43/40
Inventor 汪华林吴霁薇李诗豪黄渊杜军俏郝明勋常玉龙周守为付强魏纳王国荣李海涛钟林
Owner EAST CHINA UNIV OF SCI & TECH