| 考虑应力敏感性的煤层气井排采特征 |
| |
| 引用本文： | 郭春华,周文,孙晗森,杨勇.考虑应力敏感性的煤层气井排采特征[J].煤田地质与勘探,2011,39(5):27-30. |
| |
| 作者姓名： | 郭春华 周文 孙晗森 杨勇 |
| |
| 作者单位： | 1. 油气藏地质及开发工程国家重点实验室, 四川 成都 610059; |
| |
| 摘 要： | 与裂缝性砂岩气藏相比，煤层气藏是一种具有阶段性应力敏感特征的特殊裂缝性气藏。在煤层气排采初期, 有效水平应力起主导作用, 随着有效应力的增大，渗透率逐渐减小；当割理内部流体压力降低到解吸压力之后, 由于基质收缩，渗透率可得到一定程度恢复。所以，提高煤层气排采效果的重要举措，是尽可能提高煤层气压降-解吸的面积。在煤层气开采初期，不合理的高排采速率将引起近井地带渗透率降低，影响压降漏斗的传播，造成增排不增产的后果。通过岩心应力敏感实验，得到了岩心渗透率随有效应力的变化规律。以煤层气开采井为例，利用ECLIPSE E300三维双重孔隙介质多组份模拟器，证明了初期排采量并非越大越好，而是存在一个合理值。该结论可用于指导煤层气井的开采。
|
| 关 键 词： | 煤层气 有效应力 固流耦合 排采速率 |
| 收稿时间： | 2010-08-08 |
The relationship between stress sensitivity and production of coal bed methane wells |
| |
| GUO Chunhua,ZHOU Wen,SUN Hansen,YANG Yong.The relationship between stress sensitivity and production of coal bed methane wells[J].Coal Geology & Exploration,2011,39(5):27-30. |
| |
| Authors: | GUO Chunhua ZHOU Wen SUN Hansen YANG Yong |
| |
| Institution: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610059, China;2. Chengdu University of Technology, Chengdu 610059, China;3. China United coal bed Methane Company Ltd. Beijing 100011, China;4. Institute of Petro China, Changqing Oilfield Company, Xi'an 710003, China |
| |
| Abstract: | The coal bed methane reservoir is typically sensitive to stress,which is quite different from conventional gas reservoir with natural fractures.During the primary period of production,the permeability shows declining trend with the increment of effective stress.However,the matrix shrinkage could result in increasing permeability with the continuous desorption of coal bed gas from the matrix,which brings forward the importance to increase desorption area as much as possible to improve gas productivity.If the... |
| |
| Keywords: | coal bed methane effective stress solid-fluid coupling discharge rate |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《煤田地质与勘探》浏览原始摘要信息 |
| 点击此处可从《煤田地质与勘探》下载免费的PDF全文 |
|
