An Experimental Study on Hydrate Formation and Blockage in a Pure Water System

doi:10.11885/j.issn.1674-5086.2018.09.15.01

Abstract

Abstract: To ensure the safety of hydrate slurry flow in pipelines, an experiment on CO₂ hydrate synthesis and blockage was performed to investigate the morphological changes to CO₂ hydrates from the point of synthesis to pipeline blockage in a pure water system as well as the influences of system pressure and pump speed on the flow patterns of the hydrate slurry. The experimental results of this study are as follows:(1) In a pure water system, hydrates exist in the form of slurries or slush within pipelines, and the time interval between CO₂ hydrate synthesis and pipeline blockage is relatively short. (2) The critical pump speed during the experiment is 35 Hz. When the pump speed exceeds 35 Hz, the hydrates do not result in blockage during pipeline transportation; when the pump speed is below 35 Hz, an increase in pump speed delays the occurrence of hydrate blockage under conditions of identical system pressure. (3) Under conditions of identical pump speed, an increase in system pressure shortens the time interval between hydrate synthesis and blockage. At system pressures of 3.4 MPa and 2.4 MPa, hydrate blockages respectively occur at 2 100 s and 6 225 s after hydrate synthesis.

Key words: CO₂ hydrates, synthesis, blockage, pump speed, pressure

CLC Number:

TE38
TQ026

LI Le, ZHU Qianyi, CHEN Xiaokang. An Experimental Study on Hydrate Formation and Blockage in a Pure Water System[J]. 西南石油大学学报(自然科学版), 2019, 41(4): 152-158.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2018.09.15.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2019/V41/I4/152

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