Natural gas hydrate pipeline conveying and decomposing device

Abstract

The invention belongs to the field of petroleum engineering and relates to the technology of natural gas storage and transport, in particular to a whole-course swing spiral flow conveying pipeline and natural gas hydrate decomposing process device. A natural gas hydrate pipeline conveying device is composed of flow guide strips at two ends, the two flow guide strips are symmetrically arranged in a pipe wall, are fixed around the inner wall of a pipeline in the same direction in the whole course and form a spiral shape, and a spiral pipeline is formed. By means of the pipeline spiral gas hydrate conveying method, addition of inhibitors, polymerization inhibitors and other chemicals is omitted, and conveying safety and economical efficiency of natural gas are improved. By the adoption of a three-stage hydrate decomposing tower, carbon dioxide and hydrogen sulfide are effectively separated out, traditional natural gas desulfuration and decarbonization equipment is omitted, and water in the whole process is recycled through a water storage tank. Besides, a solar heat collector is used for heating the water, energy consumption is low, and the requirements for economic efficiency, environment protection, high efficiency, recyclability and the like are met.

Description

technical field [0001] The invention belongs to the field of petroleum engineering and relates to natural gas storage and transportation technology, in particular to a whole-course swirling spiral flow conveying pipeline and a natural gas hydrate decomposition process device, which can also be used in other fields such as gas hydrate transportation and decomposition. Background technique [0002] Oil and natural gas transportation is an important part of oil and gas field exploitation, among which pipeline transportation is the most common way; natural gas extracted from oil fields usually contains complex media such as water, hydrogen sulfide, carbon dioxide, etc., and needs to be transported to the combined station for processing through gathering and transportation pipelines. Due to the high pressure and low ambient temperature during pipeline transportation, natural gas hydrates are easily generated during oil and gas transportation and block the pipelines; at present, th...

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Problems solved by technology

[0002] Oil and natural gas transportation is an important part of oil and gas field exploitation, among which pipeline transportation is the most common way; natural gas extracted from oil fields usually contains complex media such as water, hydrogen sulfide, carbon dioxide, etc., and needs to be transported to the combined station for processing through gathering and transportation pipelines. Due to the high pressure and low ambient temperature during pipeline transportation, natural gas hydrates are easily generated during oil and gas transportation and block the pipelines; at present, the method used to prevent hydrates from clogging pipelines is to add hydration The most commonly used hydrate formation inhibitor is methanol. According to incomplete statistics, the annual cost of injecting inhibitors to prevent hydrate formation in the world is about 500 million U.S. dollars; in order to solve the problems caused by the use of inhibitors The cost is too high. People use pipeline insulation materials to maintain the temperature in the pipeline to suppress the formation of hydrates, but the cost of insulation materials used to prevent hydrate formation in pipelines is as high as 620,000 US dollars per kilometer; A multi-stage natural gas dehydration device is used to control the formation of hydrate. Although the multi-stage dehydration device can effectively remove the moisture in natural gas, it is difficult to realize it in the actual operation process due to the high equipment cost and poor economy.

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