Abstract
In this paper, the problem of gas hydrate blockage during gas production in a oilfield in Western China is taken as the research object. Aiming at the characteristics of gas hydrate blockage in this oilfield, simulation calculation and experimental study on blockage removal process of self-generating pyrolysis agent are carried out. Mathematical model of gas hydrate comprehensive decomposition rate and heat transfer are established. Based on the established mathematical model, the gas hydrate blockage removal process is compiled. The simulation program, numerical simulation program and Fluent software were used to simulate the plugging removal process of self-generating pyrolysis agent at 0.5 mol/L, 1 mol/L, 1.5 mol/L, 2 mol/L, 2.5 mol/L, 3 mol/L concentration. The distributions of temperature, water volume fraction, gas volume fraction and hydrate volume fraction in wellbore during the plugging removal process with different concentration of plugging removal agent were obtained. The dosage of plugging remover and the time of plugging removal under different concentration of self-heating plugging remover were also obtained. At the same time, experimental study on plugging removal process under different concentration of plugging removal agent was carried out. The amount of plugging removal agent and plugging removal time required under different concentration of pyrolysis agent were measured. The coincidence between the simulated and experimental values of the amount of plugging remover and the time of plugging removal is more than 80%. The numerical simulation and experimental study show that with the increase of the concentration of plugging removal agent, the time of plugging removal is shortened and the amount of plugging removal agent is reduced. The data and conclusions obtained in this paper can help the on-site constructors to master the dynamic change process of each parameter in the process of plug removal construction, and guide the constructors to determine the amount of plug removal agent and predict the time required for plug removal construction.
Copyright 2019, IFEDC Organizing Committee.
This paper was prepared for presentation at the 2019 International Field Exploration and Development Conference in Xi’an, China, 16–18 October, 2019.
This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Technical Team and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Technical Committee its members. Papers presented at the Conference are subject to publication review by Professional Team of IFEDC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of IFEDC Organizing Committee is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.
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Acknowledgments
The research was funded by National Key Research and Development Programs (No. 2016YFC0304008 and No. 2018YFC0310203), Strategic Research Program of Chinese Academy of Engineering in Science and Technology Medium and Long–Term Development Strategy Research Field (No. 2017–ZCQ–5), Natural Science Foundation of China (No. 51874252), Open Fund Project of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (No. PLN201816), Basic Applied Research Projects of Sichuan Province (No. 2019YJ0351), and Scientific Research Starting Project of Southwest Petroleum University (No. 2018QHZ007).
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Li, Ht. et al. (2020). Numerical Simulation of Plugging Removal by Hydrate Authigenic Pyrolysis Plugging Agent in Gas Well Production. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2019. IFEDC 2019. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-2485-1_90
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DOI: https://doi.org/10.1007/978-981-15-2485-1_90
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