The use of heat-assisted antigravity drainage method in the two horizontal wells in gas production from the Qilian Mountain permafrost hydrate deposits

Abstract The occurrence of gas hydrate deposits in the Qinghai–Tibet plateau permafrost (QTPP) were confirmed during the Scientific Drilling Project of Gas Hydrate in Qilian Mountain permafrost (QMP) in 2008–2009. A total of four test wells were completed, and gas hydrate samples were obtained from the drilling wells of DK-1, DK-2, and DK-3. The objective of this study is the analysis of gas production potential from gas hydrate-bearing zone of DK-2 using dual horizontal wells based on its geological properties at this site. In this paper, production strategies of permafrost hydrate deposits with the novel Heat-Assisted Antigravity Drainage (HAAD) method are investigated numerically. Gas production is induced in a two-well system and its influence factors are evaluated. When suitable heat injection rate and depressurization driving force are applied to the lower well and the upper well, respectively, favorable gas-to-water ratio and energy ratio can be obtained during the whole HAAD process. However, the absolute gas production rate may not be economically attractive for the production method we have employed. The sensitivity analysis indicates that the hydrate deposits with higher intrinsic permeability and larger rock porosity will show better perspective for hydrate exploitation.

[1]  George J. Moridis,et al.  A huff-and-puff production of gas hydrate deposits in Shenhu area of South China Sea through a vertical well , 2012 .

[2]  Gang Li,et al.  The use of dual horizontal wells in gas production from hydrate accumulations , 2013 .

[3]  Gang Li,et al.  Experimental investigation into methane hydrate production during three-dimensional thermal huff and puff , 2011 .

[4]  N. N. Trung.  The gas hydrate potential in the South China Sea , 2012 .

[5]  Xiao-Sen Li,et al.  Measurements of Water Permeability in Unconsolidated Porous Media with Methane Hydrate Formation , 2013 .

[6]  Tayfun Babadagli,et al.  SAGD laboratory experimental and numerical simulation studies: A review of current status and future issues , 2009 .

[7]  Gang Li,et al.  Experimental and Numerical Studies on Gas Production from Methane Hydrate in Porous Media by Depressurization in Pilot-Scale Hydrate Simulator , 2012 .

[8]  V. Yakushev,et al.  Natural gas and gas hydrate accumulations within permafrost in Russia , 2000 .

[9]  Gang Li,et al.  Numerical simulation of gas production potential from permafrost hydrate deposits by huff and puff method in a single horizontal well in Qilian Mountain, Qinghai province , 2012 .

[10]  R. Boswell,et al.  Current perspectives on gas hydrate resources , 2011 .

[11]  Gang Li,et al.  Experimental study on gas production from methane hydrate in porous media by SAGD method , 2013 .

[12]  George J. Moridis,et al.  Gas production from a cold, stratigraphically-bounded gas hydrate deposit at the Mount Elbert Gas Hydrate Stratigraphic Test Well, Alaska North Slope: Implications of uncertainties , 2011 .

[13]  George J. Moridis,et al.  Analysis of Reservoir Performance of Messoyakha Gas Hydrate Field , 2008 .

[14]  Wu Qingbai,et al.  Assessing the permafrost temperature and thickness conditions favorable for the occurrence of gas hydrate in the Qinghai―Tibet Plateau , 2010 .

[15]  Bing Li,et al.  Design and Experimental Study of the Steam Mining System for Natural Gas Hydrates , 2012 .

[16]  Van Genuchten,et al.  A closed-form equation for predicting the hydraulic conductivity of unsaturated soils , 1980 .

[17]  Jeonghwan Lee,et al.  Experimental Study on the Dissociation Behavior and Productivity of Gas Hydrate by Brine Injection Scheme in Porous Rock , 2010 .

[18]  Marco J. Castaldi,et al.  Large scale reactor details and results for the formation and decomposition of methane hydrates via thermal stimulation dissociation , 2012 .

[19]  George J. Moridis,et al.  The use of huff and puff method in a single horizontal well in gas production from marine gas hydrate deposits in the Shenhu Area of South China Sea , 2010 .

[20]  Gang Li,et al.  Experimental investigation into gas production from methane hydrate in sediment by depressurization in a novel pilot-scale hydrate simulator , 2012 .

[21]  George J. Moridis,et al.  Evaluation of Gas Production Potential from Marine Gas Hydrate Deposits in Shenhu Area of South China Sea , 2010 .

[22]  George J. Moridis,et al.  A Domain Decomposition Approach for Large-Scale Simulations of Flow Processes in Hydrate-Bearing Geologic Media , 2008 .

[23]  Carolyn A. Koh,et al.  Clathrate hydrates of natural gases , 1990 .

[24]  Changling Liu,et al.  Gas Hydrates in the Qilian Mountain Permafrost, Qinghai, Northwest China , 2010 .

[25]  N. Sultan,et al.  Modeling on Gas Hydrate Formation Conditions in the Qinghai-Tibet Plateau Permafrost , 2009 .

[26]  M. Lee,et al.  Pre- and post-drill comparison of the Mount Elbert gas hydrate prospect, Alaska North Slope , 2011 .

[27]  Gang Li,et al.  Gas Production from Methane Hydrate in a Pilot-Scale Hydrate Simulator Using the Huff and Puff Method by Experimental and Numerical Studies , 2012 .

[28]  Tao Yu,et al.  Numerical simulation of gas production from hydrate deposits using a single vertical well by depressurization in the Qilian Mountain permafrost, Qinghai-Tibet Plateau, China , 2013 .

[29]  George J. Moridis,et al.  Depressurization-induced gas production from Class 1 hydratedeposits , 2005 .

[30]  M. Reagan,et al.  Strategies for gas production from oceanic Class 3 hydrate accumulations , 2007 .

[31]  George J. Moridis,et al.  Evaluation of the Gas Production Potential of Marine Hydrate Deposits in the Ulleung Basin of the Korean East Sea , 2007 .

[32]  K. Sasaki,et al.  Gas Production System From Methane Hydrate Layers by Hot Water Injection Using Dual Horizontal Wells , 2007 .

[33]  Zhu You-hai.  Gas Hydrates in the Qilian Mountain Permafrost and Their Basic Characteristics , 2010 .

[34]  M. Kowalsky,et al.  TOUGH+Hydrate v1.0 User's Manual: A Code for the Simulation of System Behavior in Hydrate-Bearing Geologic Media , 2008 .

[35]  George J. Moridis,et al.  Evaluation of the Gas Production Potential of Some Particularly Challenging Types of Oceanic Hydrate Deposits , 2011 .

[36]  Bo Li,et al.  Numerical Simulation of Gas Production from Natural Gas Hydrate Using a Single Horizontal Well by Depressurization in Qilian Mountain Permafrost , 2012 .

[37]  Youhai Zhu,et al.  Gas hydrate occurrences in the Qilian Mountain permafrost, Qinghai Province, China , 2011 .