Abstract
In the dehydration process of offshore natural gas production, due to the site limitation of the platform, if the conventional triethylene glycol (TEG) dehydration process is employed, the size of the absorption tower is usually small. However, in the case of fluctuations in raw material gas and large gas production, it is easy to cause a large loss of TEG and a flooding event, resulting in the water dew point of natural gas not meeting the requirements. Therefore, combined with the dehydration process of TEG and supergravity technology, a new dehydration process of natural gas suitable for offshore platforms is proposed in this paper. The principle and process of the TEG dehydration process based on supergravity technology are discussed by establishing a mass transfer model. The laboratory experiment of the new process is carried out, and the effects of TEG flow rate, super-gravity packed bed rotation speed, and gas flow rate on the air dew point are obtained. By studying the dewatering balance of the rotating packed bed in the improved process, it is proved that the dewatering performance of the high gravity machine (Higee) is much better than that of the ordinary tower dewatering equipment. Through field experiments, the dewatering effect of continuous operation and sudden changes in working conditions is obtained, indicating that the Higee can completely replace the traditional tower equipment for natural gas dehydration.
Highlights
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Trenchless Technology Center, Louisiana Tech University, 599 Dan Reneau Dr, Engineering Annex, Ruston, Safety, Environment and Technology Supervision Research Institute, Petro China Southwest Oil and Gasfield
Triethylene glycol (TEG) dehydration technology is the most widely used in the natural gas dehydration process
Compared with the experimental results in the laboratory, the dehydration effect of the high gravity machine was obviously improved in the field experiment, because there was no heating of triethylene glycol (TEG) in the laboratory; but under the heating conditions of the field experiment, the temperature of poor TEG solution was higher, the viscosity was relatively low, and the accelerated mass transfer effect of the Higee was more obvious
Summary
When the pressure and temperature of natural gas change, water vapor forms the hydrate. Triethylene glycol (TEG) dehydration technology is the most widely used in the natural gas dehydration process. Instability of the traditional dehydration process results in the of corrosion ofequipment platform equipment and it is not suitable to directly adopt the conventional triglyceride dehydration process and pipelines. This paper takes the TEG dehydration system of an offshore platform as an example to verify the feasibility of replacing the original tower equipment with the super gravity equipment. The composition of natural gas changes (Table 1), and the of C3 + increases, so that excessive light hydrocarbons are mixed with TEG, causing TEG to foam and composition of C3+ increases, so that excessive light hydrocarbons are mixed with TEG, causing TEG affect the dehydration effect.
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