摘要
随着中国经济的快速发展,能源供需矛盾日益突出,由于过度依赖化石能源,大量排放CO2,致使面临的环境压力越来越大。CO2驱煤层气(CO2 enhanced coal-bed methane)技术可同时增产煤层气和大规模减排CO2,在我国具有良好应用前景,但应用该技术在注采生产过程中因煤层吸附CO2产生的膨胀效应对套管稳定性的影响尚未引起重视。通过建立考虑CO2煤岩吸附膨胀效应的套管-充填材料-煤岩平面应变模型计算的套管应力和变形理论解与ABAQUS数值模拟结果具有良好的一致性,并分析了CO2吸附膨胀条件下套管应力的影响因素。分析结果表明,膨胀对套管应力和变形具有显著影响。在给定CO2吸附浓度和套管内径条件下,套管和充填材料的壁厚、充填材料和煤岩的力学参数是影响套管应力的主要因素,可通过增加套管或(和)充填材料壁厚以及改变充填材料力学参数来降低套管应力。开发超低弹模和较大泊松比的充填材料是降低套管应力的有效途径。
The large amount of CO2 emission as a result of excessively relying on the fossil energy leads to global warming, CO2-ECBM（CO2 enhanced coal-bed methane） is an attractive way of enhancing CH4 recovery and sequestering CO2. When CO2 replaces CH4 in the coalbeds in ECBM（, it will generate dramatic swelling. This paper addresses the influence of the swelling on the casing stability. Consistent results are gained using the analytic model proposed by the authors and ABAQUS simulator. Swelling of coal can bring dramatic impact on the casing stability. Based on the analysis of the impact factors of casing stress, it can be concluded that the casing stress can be obviously weakened by promoting the wall thickness of the casing or by using the filling material of very high Poisson ratio and Young＇s modulus.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2006年第7期1043-1048,共6页
Rock and Soil Mechanics
基金
中国科学院"百人计划"资助项目
