A Systematic Reservoir Simulation Study on Assessing the Feasibility of CO2 Sequestration in Shale Gas Reservoir with Potential Enhanced Gas Recovery

2017 ◽  
Author(s):  
Jie Zhan ◽  
Qingwang Yuan ◽  
Allan Fogwill ◽  
Hua Cai ◽  
Hossein Hejazi ◽  
...  
Keyword(s):  
Simulation Study ◽  
Shale Gas ◽  
Reservoir Simulation ◽  
Gas Reservoir ◽  
Enhanced Gas Recovery ◽  
Gas Recovery ◽  
Shale Gas Reservoir

Investigation of CO2–CH4 Displacement and Transport in Shale for Enhanced Shale Gas Recovery and CO2 Sequestration

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Xi-Dong Du ◽  
Min Gu ◽  
Shuo Duan ◽  
Xue-Fu Xian
Keyword(s):  
Shale Gas ◽  
Co2 Storage ◽  
Fixed Bed ◽  
Co2 Injection ◽  
Gas Reservoir ◽  
Co2 Gas ◽  
Gas Recovery ◽  
Shale Gas Reservoir ◽  
Shale Reservoir ◽  
Adsorption Amount

To gain a better understanding of the enhanced shale gas recovery by CO2 gas injection (CO2-ESGR) technique, the dynamic displacement mechanism of CO2–CH4, the CO2 enhanced shale gas recovery (RCH4), and CO2 storage capacity (VCO2) were studied based on transport properties of CO2 and CH4. Experiments of CO2 injection into shale gas reservoir preadsorbed by CH4 were performed in a fixed bed. Breakthrough curves were obtained under different test conditions and simulated by one-dimension advection-dispersion (AD) model. It was found that dispersion coefficient (K1) rather than molecular diffusivity of CO2 dominated its transport in shale. K1 together with advection velocity (υ) of CO2 during CH4 displacement controls RCH4 and VCO2. When transporting in shale gas reservoir, CO2 had larger dynamic adsorption amount and υ, but smaller K1 than CH4. The competitive transport and adsorption behavior of CO2 and CH4 made it possible for CO2 to store in shale reservoir and to drive the in-place CH4 out of shale reservoir. The transfer zone of CO2–CH4 displacement (CCD) was very wide. High RCH4 and VCO2 were reached at low injection CO2 gas pressure and for small shale particles. Higher injection flow rates of CO2 and temperatures ranging from 298 K to 338 K had a little effect on RCH4 and VCO2. For field conditions, high CO2 injection pressure has to be used because the pore pressure of shale reservoir and adsorption amount of CH4 increase with the increase in depth of shale gas reservoir, but RCH4 is still not high.

scholarly journals Research progress and prospects of CO2 enhanced shale gas recovery and geologic sequestration

2018 ◽  
Vol 53 ◽  
pp. 04002
Author(s):  
Rong Chen ◽  
GuoHui Zhang ◽  
ChengGao Yi
Keyword(s):  
Numerical Simulation ◽  
Shale Gas ◽  
Carbonic Acid ◽  
Research Progress ◽  
Geologic Sequestration ◽  
Affecting Factors ◽  
Gas Reservoir ◽  
Shale Formations ◽  
Gas Recovery ◽  
Shale Gas Reservoir

CO2 injection to strengthen shale gas development is a new technology to improve shale gas recovery and realize geologic sequestration. Many scholars have studied these aspects of this technology: mechanism of CO2 displacement CH4, CO2 and CH4 adsorption capacity, affecting factors of shale adsorption CO2, CO2 displacement numerical simulation, and supercritical CO2 flooding CH4 advantages. Research shows that CO2 can exchange CH4 in shale formations, improve shale gas recovery, on the other hand shale formations is suitable for CO2 sequestration because shale gas reservoir is compact. The supercritical CO2 has advantages such as large fluid diffusion coefficient, CO2 dissolution in water to form carbonic acid that can effectively improve the formation pore permeability etc., so the displacement efficiency of supercritical CO2 is high. But at present the technology study mainly focus on laboratory and numerical simulation, there is still a big gap to industrial application, need to study combined effect of influence factors, suitable CO2 injection parameter in different shale gas reservoir, CO2 injection risk and solutions etc.

scholarly journals THE IMPACT OF THE PRODUCTION OF NEIGHBOUR WELLS ON WELL PRODUCTIVITY IN A SHALE GAS RESERVOIR

2014 ◽  
Vol 15 (1) ◽  
Author(s):  
Asri Nugrahanti ◽  
Agus Guntoro ◽  
Muhammad Taufiq Fathaddin ◽  
Denny Suwanda Djohor
Keyword(s):  
Shale Gas ◽  
Recovery Factor ◽  
Gas Reservoir ◽  
Gas Recovery ◽  
Shale Gas Reservoir ◽  
Matrix Permeability ◽  
Well Spacing ◽  
Influence Parameter ◽  
The Impact ◽  
Half Length

ABSTRACT: A shale gas reservoir is a self-contained source-reservoir system, characterized by extremely low matrix-permeability and low porosity, which typically requires extensive fracturing to produce gas at commercial rates. This paper presents a simulation experiment, intended to study the impact of well interference on gas recovery in a shale gas reservoir. The simulation model was constructed to study well interference through variation of horizontal well length, fracture half length, number of fracture, and well spacing. The results show that the increment of recovery factor of a well in the presence of neighbour wells is up to 7%. In this study, fracture half length is the most influence parameter on recovery factor, initial rate and reservoir pressure decline. ABSTRAK: Takungan gas syal merupakan sistem sumber-takungan kandung sendiri, khasnya kerana ia mempunyai kebolehtelapan-matriks yang begitu rendah dan keliangan yang rendah.  Sifat sebegini memerlukan ia melalui peretakan yang ekstensif untuk menghasilkan gas pada nilai komersial. Kertas kerja ini membentangkan eksperimen simulasi yang bertujuan untuk mengkaji impak perigi interferens terhadap perolehan gas dalam takungan gas syal.  Model simulasi di konstruksi untuk mengkaji interferens perigi; iaitu menerusi pelbagai variasi  panjang mendatar perigi, retakan separuh panjang dan jarak perigi.  Keputusan menunjukkan peningkatan faktor perolehan perigi sebanyak 7% dengan kehadiran perigi bersebelahan. Dalam kajian ini, retakan separuh panjang merupakan ciri utama dalam faktor perolehan, kadar awalan dan penurunan tekanan takungan.

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