Submarine pipeline double-layer direct electric heating device and method

Abstract

The invention discloses a submarine pipeline double-layer direct electric heating device and method, the submarine pipeline double-layer direct electric heating device comprises one or more offshore floating type power supply devices, and a pipeline and power supply integrated connecting device is arranged outside a double-layer oil and gas pipeline. The offshore floating type power supply device is connected with the pipeline and power supply integrated connecting device in a one-point or multi-point mode after passing through a submarine power supply cable and the power transformation device. Short-distance quick heating can be achieved through single-point power supply, short-distance powerful heating can be achieved through multi-point power supply, long-distance powerful heating can be achieved through multi-point power supply, and different heating requirements are met. The method is high in efficiency, the heating device is simple, excessive auxiliary equipment does not need to be installed, the heating effect is more uniform by means of the heat generation mechanism that resistance generates heat, the method is suitable for short-distance emergency plug removal of the submarine pipeline, and the method also has good universality for long-distance and continuous heat tracing of the submarine pipeline in a multi-point power supply mode.

Description

technical field [0001] The invention relates to a submarine pipeline electric heating technology, in particular to a submarine pipeline double-layer direct electric heating device and method. Background technique [0002] At present, the reserves of highly condensable and highly viscous crude oil in the sea are huge. With the continuous development of offshore oil and gas fields to deep water, flow guarantee problems such as hydrate blockage, condensable oil gelation, and paraffin deposition are emerging one after another. The demand for safe crude oil transportation technology is urgent, and the selection of pipeline transportation technology (especially active heat tracing technology) is very important in deepwater offshore oil development. [0003] In the existing technology, traditional flow assurance measures such as reverse pressurization, reverse pigging, addition of inhibitors, dilution and water mixing, fluid replacement, etc. have problems such as complicated opera...

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Problems solved by technology

[0004] However, this solution has deficiencies such as current dissipation, current corrosion, and low heat tracing efficiency to varying degrees, which pose a great challenge to its popularization and application in submarine gathering and transportation pipelines, such as short-distance efficient heat tracing and long-distance continuous heat tracing.

[0005] Therefore, under the diverse heat tracing requirements of the seabed, the heat tracing methods proposed in patents such as CN104094492A and CN201606617U may not meet the safety needs of actual engineering, which seriously restricts the development of offshore heavy oil and high pour point oil fields

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