FLNG/FLPG oil gas pretreatment and liquefaction method

Abstract

The invention relates to a FLNG / FLPG oil gas pretreatment and liquefaction method which comprises the following steps: 1) arranging an oil gas pretreatment and liquefaction system comprising a natural gas pretreatment system, a light hydrocarbon recovery and separation system, a propane precooling system, a liquefaction supercooling system and a plurality of cold boxes; 2) transmitting natural gas mixture transmitted via a submarine pipeline to a slug flow capturer, then, sending natural gases flowing out of a natural gas pipeline to the natural gas pretreatment system, and sending condensated oil flowing out of a condensated oil pipeline to the light hydrocarbon recovery and separation system; 3) carrying out deacidification, dehydration and demercuration pretreatment on the natural gases flowing out of the natural gas pipeline; 4) carrying out light hydrocarbon recovery and separation on the natural gases obtained after the pretreatment; 5) carrying out propane circulation precooling on the natural gases obtained after the light hydrocarbon recovery; and 6) carrying out liquidation and supercooling circulation processing on the natural gases obtained after the precooling. The method can well solve the problems that in an existing liquidation process, maritime applicability is poor, conventional nitrogen expansion process processing capacity is weak, and efficiency is low. The method can be widely applied to the FLNG / FLPG oil gas pretreatment and liquefaction process.

Description

technical field [0001] The invention relates to an oil and gas pretreatment and liquefaction method, in particular to a FLNG / FLPG (floating liquefied natural gas / floating liquefied petroleum gas) oil and gas pretreatment and liquefaction method. Background technique [0002] my country's offshore natural gas resources are abundant, but the natural gas resources are scattered, and a considerable part of them are deep-sea gas fields, marginal small gas fields and low-grade natural gas resources. For these gas sources, if traditional offshore fixed platforms or submarine pipelines are used, most gas fields cannot be put into production due to cost or technical limitations. If the existing LNG-FPSO (liquefied natural gas floating production, storage and offloading device) is used, it can be flexibly configured according to the production status of the offshore natural gas field, and the liquefied natural gas on board can be transported to the destination. This method has the ad...

AI Technical Summary

Problems solved by technology

However, the existing liquefaction technology has defects such as poor applicability at sea, small processing capacity and low efficiency of the conventional nitrogen expansion process.

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