CO 2 Sequestration potential in Coal Seams of China

Transcription

1 GCEP International Workshop August, 2005 Tsinghua University CO 2 Sequestration potential in Coal Seams of China Ye Jianping, Feng Sanli, Fan Zhiqiang(CUCBM) Bill Gunter, Sam Wong, David Law (ARC) China United Coalbed Methane Co., Ltd. Beijing

2 Outline of Presentation The enhanced coalbed methane (ECBM) and CO 2 Sequestration process Laboratory measurements of CO 2 / CH 4 adsorption Micro-pilot field test in south Qinshui basin CO 2 storage potential in coal seams in China

3 1 The enhanced coalbed methane (ECBM) and CO 2 Sequestration process

4 Opportunity to address both Gas Supply and Environment Flue Gas CO2 N 2 Flue Gas CO 2 Electricity Plant Separation N 2 Hydrogen Plant Coal Injection Deep Coal bed CO 2 CH 4 CH 4 Enhanced coalbed methane (ECBM) recovery Sequestration of CO 2

5 Process of Gas Transport in Coalbed Methane Reservoirs Face Cleat Butt Cleat 1. Fluid Production from Natural Fractures 2. Gas Desorption from Cleat surfaces 3. Molecular Diffusion through the coal matrix

6 Sorption Data for Different Pure Gases 3 Sorbed Gas Content Pressure (MPa)

7 CO 2 -ECBM Recovery Mechanisms CH 4 CO 2 CO 2 Coal Matrix CH 4 CO 2 Coal Cleats CH 4 H 2 O CH 4 CO 2 CO 2 CH 4 CH 4 Injected carbon dioxide in cleats Increases total cleat pressure Carbon dioxide diffuses into matrix and strongly adsorbs onto coal Reduces partial pressure of methane in cleats Methane desorbs from matrix and diffuses to cleats Methane and water flow to wellbore

8 N 2 -ECBM Recovery Mechanisms CH 4 Coal Matrix CH 4 CH Coal Cleats 4 N N 2 2 H 2 O CH 4 N 2 CH 4 CH 4 Injected nitrogen into cleats Increases total cleat pressure Nitrogen diffuses into matrix and weakly adsorbs onto coal Reduces partial pressure of methane in cleats Methane desorbs from matrix and diffuses to cleats Methane, nitrogen and water flow to wellbore

9 ECBM Production Profile 3 CH 4 Production Rate 2 1 Gas Breakthrough P P I P P Time (years)

10 5-Spot Pattern Simulation CO 2 and N 2 Propagation CO 2 Injection CO 2 /N 2 Content 1 0 N 2 Injection After 1 year After 3 years After 5 years After 7 years 1/4 of 5-Spot Pattern Constant Injection Rate

11 ECBM Process CO 2 is stored in the coal and will not breakthrough to the producing wells until most of the coalbed methane is produced N 2, because it is less adsorbing, will be produced with the coalbed methane and breakthrough to the producing wells quickly

12 2 Laboratory Measurements of CO 2 and CH 4 Adsorption

13 2 Laboratory Measurements of CO 2 and CH 4 Adsorption Experiment of CH 4 and CO 2 adsorption/desorption in five coal samples with different rank : Anthracite (coal sample Ro 3.62%) Lean coal (Ro 1.94%) Coking coal (Ro 1.52%) Long flame coal (Ro 0.56%) lignite (Ro 0.49%)

14 2 Laboratory Measurements of CO 2 and CH 4 Adsorption CO 2 adsorption capacity increases when coal rank increases.

15 2 Laboratory Measurements of CO 2 and CH 4 Adsorption CH 4 adsorption capacity increases when coal rank increases.

16 2 Laboratory Measurements of CO 2 and CH 4 Adsorption CO 2 Adsorption capacity is greater than CH 4. CO 2 Adsorption selectivity decreases relative to methane,when coal rank increases. Langmuir selectivity for CO 2 to CH 4 are from 3.3:1 to 1.5:1 from lignite to anthracite.

17 2 Laboratory Measurements of CO 2 and CH 4 Adsorption

18 2 Laboratory Measurements of CO 2 and CH 4 Adsorption Langmuir selectivity for CO2 to CH4: 2.29

19 2 Laboratory Measurements of CO 2 and CH 4 Adsorption

20 2 Laboratory Measurements of CO 2 and CH 4 Adsorption Experiment results: CO 2 and CH 4 adsorption capacity also increases when coal rank increases But Langmuir selectivity for CO 2 to CH 4 decreases when coal rank increases. Langmuir selectivity for CO 2 and CH 4 is greater in the lignite than in the anthracite.

21 3 Micro-pilot field test in south Qinshui basin

22 China United Coalbed Methane Co.,Ltd (CUCBM) State-owned company under the direct auspices of the State Council, including the State Plan, Finance, Science and Technology Exclusive rights for exploration, development and production of CBM in cooperation with foreign companies Professional company responsible for exploration, development, production and sale of CBM in China

23 Demonstration Site Location Shanxi Province Hebei Province Shijiazhuang Potential Pilot Area Taiyuan Qinshui County Qinshui Basin Jincheng ADB CMM Project Changzhi Anyang Henan Province Zhengzhou

24 Activities in South Qinshui Basin 170 wells and more than D seismic lines have been completed by CUCBM. (Up to Aug. 18, 2005) 3 CBM pilots have been set up. 1 National test field for CBM development has been confirmed. 1 Z-pinnate System has been tested. 1 CO 2 micro-pilot

25 China ECBM Project Canadian International Development Agency (CIDA) Canadian Climate Change Development Fund (CCCDF) (CA $ 5 million) Ministry of Commerce (MOFCOM) China United Coalbed Methane Corporation Ltd. (CUCBM) (CA $ 5 million) year CA $ 10 million Project (Started March 2002)

26 First Micro-Pilot Test Qinshui Basin The first micro-pilot test was successful CMG s GEM CBM Model has been validated based on successful history match of the micro-pilot field data Prediction of the performance of CO 2 -ECBM recovery process indicated that more than 4 times the average CH 4 production rate compared to primary recovery can be achieved CO 2 storage into high-rank anthracite coal seam in Qinshui Basin is feasible Start design of multi-well pilot on site

27 5-Spot Field Pilot Test Prediction CO 2 Inventory Time 0 = March 16, 1998 CO 2 Stored After 6 months CO 2 Injection Start CO 2 Injection ( years)

28 4. CO 2 storage potential in coal seams in China

29 Coal Basins in China

30 4. CO 2 storage potential in coal seams in China coal resource is t over 2000m depth in China coal resource is t between m depth in China Data from China administration of coal geology, 2000

31 4. CO 2 storage potential in coal seams in China South China North-East 7% West China 7% North China 50% North-West China 36%

32 4. CO 2 storage potential in coal seams in China Coal resouce for difference depth m 30% <1000m 41% m 29%

33 4. CO 2 storage potential in coal seams in China Coal Resource in m Coal Resource/10 8 t Xinjiang Inner mongolla Shanxi Guizhou Shannxi Gansu Ningxia

34 4. CO 2 storage potential in coal seams in China Coal Resource in m Coal Resource/10 8 t Xinjiang Inner mongolla Shanxi Shannxi Gansu Ningxia Guizhou

35 4. CO 2 storage potential in coal seams in China CBM Resource(10 8 m 3 ) Distribution of CBM Resources among Coal Basins in China Erdos Qinshui Tu-Ha Zhungaer Yuxi-Double Huai Coal Basin Liupanshui Yili Chuannan- Qianbei Talimu Huoxi

36 Summary Coal resource is rich in China, Total Coal resource is t. coal resource is t between m depth. Coal mainly distributes in North China and North-west China. That injecting CO 2 to coal seams not only enhance coalbed methane recovery, but also storage CO 2. CO 2 storage potential on coal is great in China.

37 THANK YOU