scholarly journals Characterization and Prediction of the Gas Hydrate Reservoir at the Second Offshore Gas Production Test Site in the Eastern Nankai Trough, Japan

Energies ◽  
2017 ◽  
Vol 10 (10) ◽  
pp. 1678 ◽  
Author(s):  
Machiko Tamaki ◽  
Tetsuya Fujii ◽  
Kiyofumi Suzuki
Keyword(s):  
Gas Hydrate ◽  
Nankai Trough ◽  
Test Site ◽  
Gas Production ◽  
Production Test ◽  
Hydrate Reservoir ◽  
Gas Hydrate Reservoir

Comparison of Simplistic and Geologically Descriptive Production Modeling for Natural-Gas Hydrate by Depressurization

SPE Journal ◽  
2019 ◽  
Vol 24 (02) ◽  
pp. 563-578 ◽  
Author(s):  
Yilong Yuan ◽  
Tianfu Xu ◽  
Yingli Xia ◽  
Xin Xin
Keyword(s):  
Gas Hydrate ◽  
History Matching ◽  
Nankai Trough ◽  
Flow Behavior ◽  
Test Site ◽  
Gas Production ◽  
Production Test ◽  
Hydrate Reservoir ◽  
Hydrate Saturation ◽  
Production Modeling

Summary Marine-gas-hydrate-drilling exploration at the Eastern Nankai Trough of Japan revealed the variable distribution of hydrate accumulations, which are composed of alternating beds of sand, silt, and clay in sediments, with vertically varying porosity, permeability, and hydrate saturation. The main purposes of this work are to evaluate gas productivity and identify the multiphase-flow behavior from the sedimentary-complex hydrate reservoir by depressurization through a conventional vertical well. We first established a history-matching model by incorporating the available geological data at the offshore-production test site in the Eastern Nankai Trough. The reservoir model was validated by matching the fluid-flow rates at a production well and temperature changes at a monitoring well during a field test. The modeling results indicate that the hydrate-dissociation zone is strongly affected by the reservoir heterogeneity and shows a unique dissociation front. The gas-production rate is expected to increase with time and reach the considerable value of 3.6 × 104 std m3/d as a result of the significant expansion of the dissociation zone. The numerical model, using a simplified description of porosity, permeability, and hydrate saturation, leads to significant underestimation of gas productivity from the sedimentary-complex hydrate reservoir. The results also suggest that the interbedded-hydrate-occurrence systems might be a better candidate for methane (CH4) gas extraction than the massive hydrate reservoirs.

Bulk sediment mineralogy of gas hydrate reservoir at the East Nankai offshore production test site

2015 ◽  
Vol 66 ◽  
pp. 379-387 ◽  
Author(s):  
Kosuke Egawa ◽  
Okio Nishimura ◽  
Shoko Izumi ◽  
Eiji Fukami ◽  
Yusuke Jin ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Test Site ◽  
Production Test ◽  
Bulk Sediment ◽  
Hydrate Reservoir ◽  
Offshore Production ◽  
Gas Hydrate Reservoir ◽  
Sediment Mineralogy

Mechanical properties of hydrate-bearing turbidite reservoir in the first gas production test site of the Eastern Nankai Trough

2015 ◽  
Vol 66 ◽  
pp. 471-486 ◽  
Author(s):  
Jun Yoneda ◽  
Akira Masui ◽  
Yoshihiro Konno ◽  
Yusuke Jin ◽  
Kosuke Egawa ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Nankai Trough ◽  
Test Site ◽  
Gas Production ◽  
Production Test

The simulation of nature gas production from ocean gas hydrate reservoir by depressurization

2008 ◽  
Vol 51 (8) ◽  
pp. 1272-1282 ◽  
Author(s):  
YuHu Bai ◽  
QingPing Li ◽  
XiangFang Li ◽  
Yan Du
Keyword(s):  
Gas Hydrate ◽  
Gas Production ◽  
Hydrate Reservoir ◽  
Gas Hydrate Reservoir ◽  
Nature Gas

Importance of Gas Hydrates for India and Characterization of Methane Gas Dissociation in the Krishna-Godavari Basin Reservoir

2016 ◽  
Vol 50 (6) ◽  
pp. 58-68 ◽  
Author(s):  
Narayanaswamy Vedachalam ◽  
Sethuraman Ramesh ◽  
Arunachalam Umapathy ◽  
Gidugu Ananda Ramadass
Keyword(s):  
Natural Gas ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Gas Production ◽  
Hot Water ◽  
Economic Resource ◽  
Methane Gas ◽  
Hydrate Reservoir ◽  
Gas Hydrate Reservoir ◽  
Godavari Basin

AbstractNatural gas hydrates are considered to be a strategic unconventional hydrocarbon resource in the Indian energy sector, and thermal stimulation is considered as one of the methods for producing methane from gas hydrate-bearing sediments. This paper discusses the importance of this abundantly available blue economic resource and analyzes the efficiency of methane gas production by circulating hot water in a horizontal well in the fine-grained, clay-rich natural gas hydrate reservoir in the Krishna-Godavari basin of India. Analysis is done using the electrothermal finite element analysis software MagNet-ThermNet and gas hydrate reservoir modeling software TOUGH+HYDRATE with reservoir petrophysical properties as inputs. Energy balance studies indicate that, in the 90% hydrate-saturated reservoir, the theoretical energy conversion ratio is 1:4.9, and for saturations below 20%, the ratio is <1. It is identified that a water flow of 0.2 m3/h at 270°C is required for every 1 m2 of wellhead surface area to dissociate gas hydrates up to a distance of 2.6 m from the well bore within 36 h.

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