Induction heating-type short joint of marine riser used for prevention and control of hydrates during deepwater drilling

Abstract

The invention relates to an induction heating-type short joint of a marine riser used for prevention and control of hydrates during deepwater drilling. The joint comprises a communicating tubular short joint body. Induction heating coils are fixedly arranged on the outer wall surface of the tubular short joint body in a winding manner. The outside of the tubular short joint body is wrapped by a water-proof insulation layer. The induction heating coils are arranged between the tubular short joint body and the water-proof insulation layer in a sealing manner. The water-proof insulation layer isequipped with an electrifying interface connected with a power supply. The induction heating coils are electrically connected with the electrifying interface. The induction heating-type short joint ofthe marine riser used for prevention and control of hydrates during deepwater drilling is continuously powered on such that eddies are generated in the interior of the marine riser, heating the riserand the internal space thereof. Natural gas hydrates are effectively prevented from being formed in the riser. After the natural gas hydrates are formed in the interior of the riser, the induction heating coils of the short joint of the marine riser are used for power supply. By means of eddies generated in the riser, the hydrates obstructing the riser are heated in order to break the balance state. Therefore, the hydrates are decomposed in order to remove obstructions.

Description

technical field [0001] The invention relates to marine deepwater drilling equipment, in particular to an induction heating type riser nipple for preventing and controlling hydrate in deepwater drilling. Background technique [0002] With the in-depth development of offshore oil and gas resources, the key areas of oil and gas exploration and development have gradually shifted from land and offshore shallow water areas to far sea deep water areas. On the one hand, when drilling in deep-water areas of the ocean, the high-pressure and low-temperature environmental conditions near the mudline can easily cause the fluid in the pipe string and equipment to form hydrates, which will block the pipe string and prevent fluid circulation; on the other hand, the deep-water drilling area is due to The water depth is relatively deep, once hydrates are formed inside the underwater pipe string and blockage occurs, it is difficult to unblock the inside of the pipe string to restore circulatio...

AI Technical Summary

Problems solved by technology

[0003] For on-site deepwater drilling, the formation of hydrates in the internal channels of drilling strings and equipment is usually suppressed by injecting thermal fluids, kinetic or thermodynamic inhibitors into the circulation channels, but the current methods can only prevent However, it cannot completely prevent the formation of hydrate in the pipe string and equipment, and the cost of kinetic and thermodynamic inhibitors currently used in the field is very high. At the same time, such additives are not environmentally friendly products, and they are very easy to pollute the marine environment. irreparable damage to marine ecosystems

After the hydrate has formed and blocked the circulation channel, there is currently no efficient, economical and environmentally friendly deblocking method

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