Numerical Simulation of the Depressurization Process of a Natural Gas Hydrate Reservoir: An Attempt at Optimization of Field Operational Factors with Multiple Wells in a Real 3D Geological Model

Zhixue Sun, Ying Xin, Qiang Sun, Ruolong Ma, Jianguang Zhang, Shuhuan Lv, Mingyu Cai and Haoxuan Wang
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Zhixue Sun: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Ying Xin: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Qiang Sun: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Ruolong Ma: College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China
Jianguang Zhang: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Shuhuan Lv: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Mingyu Cai: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Haoxuan Wang: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China

Energies, 2016, vol. 9, issue 9, 1-20

Abstract: Natural gas hydrates, crystalline solids whose gas molecules are so compressed that they are denser than a typical fluid hydrocarbon, have extensive applications in the areas of climate change and the energy crisis. The hydrate deposit located in the Shenhu Area on the continental slope of the South China Sea is regarded as the most promising target for gas hydrate exploration in China. Samples taken at drilling site SH2 have indicated a high abundance of methane hydrate reserves in clay sediments. In the last few decades, with its relatively low energy cost, the depressurization gas recovery method has been generally regarded as technically feasible and the most promising one. For the purpose of a better acquaintance with the feasible field operational factors and processes which control the production behavior of a real 3D geological CH 4 -hydrate deposit, it is urgent to figure out the effects of the parameters such as well type, well spacing, bottom hole pressure, and perforation intervals on methane recovery. One years’ numerical simulation results show that under the condition of 3000 kPa constant bottom hole pressure, 1000 m well spacing, perforation in higher intervals and with one horizontal well, the daily peak gas rate can reach 4325.02 m 3 and the cumulative gas volume is 1.291 × 10 6 m 3 . What’s more, some new knowledge and its explanation of the curve tendency and evolution for the production process are provided. Technically, one factor at a time design (OFAT) and an orthogonal design were used in the simulation to investigate which factors dominate the productivity ability and which is the most sensitive one. The results indicated that the order of effects of the factors on gas yield was perforation interval > bottom hole pressure > well spacing.

Keywords: gas hydrate; geological model; simulation; depressurization method; Shenhu Area (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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