Establishment of the productivity prediction method of Class III gas hydrate developed by depressurization and horizontal well based on production performance and inflow relationship

•Method to establish prediction formulas for Class III gas hydrate developed by depressurization and horizontal well.•Production performance and energy consumption of gas hydrate development.•New index is introduced to revise Fetkovich’s formula and Vogel’s formula.•The revised formula can simplify...

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Bibliographic Details
Published in:Fuel (Guildford) 2022-01, Vol.308, p.122006, Article 122006
Main Authors: Zhang, Bo, Jiang, Ruijing, Sun, Bingcai, Lu, Nu, Hou, Jian, Bai, Yajie, Chen, Weiqing, Liu, Yongge
Format: Article
Language:English
Subjects:
Class III gas hydrate
Depressurization and horizontal well
Establishment method
Formulas (mathematics)
Gas hydrates
Gas production
Horizontal wells
Inflow
Inflow performance
Mathematical analysis
Mathematical models
Oil and gas production
Predictions
Pressure
Pressure reduction
Productivity
Productivity prediction
Saturation
Simulation
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Summary:•Method to establish prediction formulas for Class III gas hydrate developed by depressurization and horizontal well.•Production performance and energy consumption of gas hydrate development.•New index is introduced to revise Fetkovich’s formula and Vogel’s formula.•The revised formula can simplify the production prediction of gas hydrate. Productivity prediction is one of the important issues for the economic and effective development of gas hydrate deposit. Therefore, this paper proposes a method to establish productivity prediction for the Class III gas hydrate developed by depressurization and horizontal wells. The method are divided into four steps, including numerical simulation, production performance analysis, revision of formulas and quantitative calculation of key factors. The prediction method is based on inflow performance relationship (IPR) of gas hydrate. Considering the shape of IPR curves, Fetkovich’s formula and Vogel’s formula are selected as the basic formulas respectively for the increasing part and decreasing part of gas hydrate production. To revise Fetkovich’s formula, the deposit pressure is replaced by comprehensive deposit pressure, which is determined by energy coefficient B0. Through the analysis and evaluation of influencing factors, B0 is described by a equation related to gas hydrate saturation. To revise the Vogel’s formula, the lowest production pressure is set as the four phase point pressure, leading to the change of production pressure difference and maximum gas production rate. The key coefficient C is calculated by a equation related to gas hydrate saturation and well spacing. Compared with simulation results, the results of proposed formulas show good accuracy in the prediction of production rate of gas hydrate. The results of test point predicted by revised Fetkovich’s formula almost coincide with simulation results. The average error between results of revised Vogel’s formula and simulation results is 4.24%. So the proposed method can be applied to predict the productivity of gas hydrate for its good accuracy, fast speed and simple calculation.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2021.122006