| 煤层气水平井煤粉产出及运移特征 |
| |
| 引用本文： | 曹立虎,张遂安,张亚丽,秦鹏,韩树,王雪.煤层气水平井煤粉产出及运移特征[J].煤田地质与勘探,2014,42(3):31-35. |
| |
| 作者姓名： | 曹立虎 张遂安 张亚丽 秦鹏 韩树 王雪 |
| |
| 作者单位： | 中国石油大学气体能源开发与利用教育部工程研究中心;煤层气研究中心; |
| |
| 基金项目： | 国家科技重大专项课题(2011ZX05061;2011ZX05042-001;2011ZX05034-003) |
| |
| 摘 要： | 煤粉是煤层气水平井排采中的不利因素，影响煤层气的产能。根据沁水盆地南部樊庄区块煤层气水平井的排采数据，分析了煤粉产出特征；通过煤粉在支撑裂缝中运移的物模试验，揭示了煤粉在支撑裂缝中的运移和伤害规律；利用流体迁移规律研究装置，进一步研究了煤粉在水平井筒的流动规律，建立了煤粉运移模型。研究结果表明:煤粉主要来源为钻井过程中钻具对煤层的研磨及压裂过程中大排量携砂混合流体对裂缝煤壁的摩擦和冲刷；煤粉对支撑裂缝中导流能力伤害率达90%，且排采速度越大，出煤粉量越多；煤粉在水平井筒中运移的流型为层流流动，通过控制压力、流量和煤粉含量，可在排采初期实现对煤粉的控制。
|
| 关 键 词： | 煤层气水平井 煤粉 产出 运移 支撑裂缝 水平井筒 |
| 收稿时间： | 2013-09-23 |
Investigation of coal powder generation and migration characteristics in coalbed methane horizontal well |
| |
| Abstract: | As a disadvantage factor of drainage gas recovery in CBM horizontal well, pulverized coal usually leads to reservoir damage, pump stuck and other accidents when it transports in the fracturing propped fracture and horizontal wellbore, increasing the cost. Therefore, the coal powder output characteristic was analyzed according to the production data of Fanzhuang block in southern Qinshui basin, the migration of pulverized coal in propped fractures and the damage rule were revealed through physical model experiments on the migration of pulverized coal in propped fractures. The flow rule of pulverized coal in horizontal wellbore was further studied and the pulverized coal migration model was established with the use of the device for research of fluid migration law. The result indicates that the main sources of pulverized coal are the drill grinding of coal seam in the process of drilling and the friction and erosion of large displacement fluid mixed with sand in coal wall cracks in the process of fracturing; the damage rate of propped fracture diverting capacity caused by pulverized coal could reaches 90%, what's more, the higher the velocity of production, the more the amount of coal powder; the flow pattern of migration of pulverized coal in horizontal wellbore is the laminar flow regime, the pulverized coal could be well controlled at the beginning of production by controlling the pressure, flow and pulverized coal concentration. |
| |
| Keywords: | |
| 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 |
|
