Numerical Simulation of Plug Removal Effect of a Hydrate Self-heating Plug Removal Agent for Gas Well Production

doi:10.11885/j.issn.16745086.2020.03.26.01

Abstract

Abstract: In the later period of gas well production, blockage of the wellbore hydrates occurs frequently, and it is more important to remove the blockages of wellbore hydrates. According to the gas well hydrate blockage process and the characteristics of a certain type of self-generated thermal plugging agent, aiming at the problem of gas well hydrate blockage removal, a mathematical model for the decomposition rate of the gas hydrate blockage section and a heat transfer mathematical model were established. The simulation calculation of hydrate plugging removal process in wellbore was carried out, and the distribution cloud map of temperature, water volume fraction and other parameters in the process of plugging removal with different concentrations of plug removal agent were obtained, and the amount of plugging removal agent and the plugging removal time under different concentrations of autogenous pyrolysis plugging agent were obtained. An experimental study on the deblocking process under different concentrations of deblocking agent was carried out. The amount of deblocking agent and the time required for deblocking under different concentrations of autogenous thermal deblocking agent were measured in the experiment. The simulation calculation value and experimental value of the amount of unblocking agent and the unblocking time are more than 80%. The study found that as the concentration of the plugging agent increases, the plugging time decreases and the amount of plugging agent decreases. However, when the concentration of the anti-plugging agent exceeds 2.0 mol/L, the improvement of its anti-plugging effect is relatively reduced.

Key words: natural gas hydrate, heating method, mathematical model, removal time, dosage of removal agent

CLC Number:

TE38

DONG Shengwei, HE Aiguo, BAN Fansheng, DONG Jingnan. Numerical Simulation of Plug Removal Effect of a Hydrate Self-heating Plug Removal Agent for Gas Well Production[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(3): 117-127.

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