A Study on the Law of Liquid Accumulation Influence in Southern Sichuan Wet Gas Pipeline

doi:10.11885/j.issn.1674-5086.2022.07.23.01

Abstract

Abstract: In order to solve the serious problem of liquid accumulation in the undulating wet gas gathering and transporting pipeline of a gas field in southern Sichuan, a liquid accumulation model is established based on OLGA simulation software. The influence of gas volume, infusion volume, pressure and temperature on the amount of liquid accumulation in the pipeline is taken into account, and the change rule of liquid accumulation in the pipeline with gas volume, pressure, infusion volume and ambient temperature is revealed. The map of liquid accumulation is drawn, and the change trend of liquid accumulation is displayed directly, which provides certain data support for analyzing the effect of liquid accumulation in gas fields. Due to the complexity of flow pattern variation in the pipeline with large drop fluctuation, the evolution process of flow pattern under different working conditions is analyzed. The results show that the liquid first forms annular flow in the long updip pipe section, and gradually accumulates upward to form slug flow with the increase of liquid accumulation until the pipe is full of liquid accumulation. Based on the law of liquid accumulation, the pigging operation under mixed and separate transportation conditions is established and simulated, and the feasibility of determining pigging period by the methods of minimum gas transfer efficiency, maximum liquid accumulation amount and maximum allowable pressure drop is studied. The results show that the pigging period of the maximum allowable pressure drop method is 4.5 days for mixed transportation conditions. The pigging period is determined to be 32.0 days by the method of maximum liquid accumulation.

Key words: OLGA, liquid accumulation, flow pattern, pigging cycle, two-phase flow

CLC Number:

TE348

WU Kunyi, ZHANG Lulu, LIN Yu, LI Weixi, ZHOU Jun. A Study on the Law of Liquid Accumulation Influence in Southern Sichuan Wet Gas Pipeline[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(1): 136-146.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2022.07.23.01

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