单相流驱替物理模拟实验的煤粉产出规律研究

为研究煤层气井排采过程中煤粉的产出机理及其影响因素,开展了单相流驱替状态下煤粉产出物理模拟实验。通过改变单相流驱替流速及煤砖样品上、下围压的大小,分析不同实验条件下煤粉产出量、煤粉粒度分布特征以及裂隙导流系统的渗透率变化等参数,归纳煤粉的动态产出规律。实验结果表明：在围压稳定的实验条件下,煤粉的产出具有一定的启动运移速率;煤粉的产出量与驱替液流速呈正相关、与围压呈负相关;煤粉在裂隙系统中的存在与运移会对其渗透率产生显著的影响;间断后重启单相流驱替作用会使煤粉产出量瞬间剧增。根据模拟实验结果可以认为,优化煤层气井的排采制度、控制井底流压降压速率的变化、稳定控制排水强度,将会有效地控制煤粉的产出量...

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Bibliographic Details
Published in煤炭学报 no. 4; pp. 624 - 628
Main Author 曹代勇 姚征 李小明 魏迎春 胡爱梅 宋波
Format Journal Article
LanguageChinese
Published 2013
Subjects
单相流驱替
煤层气井
煤粉产出
物理模拟
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Summary:为研究煤层气井排采过程中煤粉的产出机理及其影响因素,开展了单相流驱替状态下煤粉产出物理模拟实验。通过改变单相流驱替流速及煤砖样品上、下围压的大小,分析不同实验条件下煤粉产出量、煤粉粒度分布特征以及裂隙导流系统的渗透率变化等参数,归纳煤粉的动态产出规律。实验结果表明：在围压稳定的实验条件下,煤粉的产出具有一定的启动运移速率;煤粉的产出量与驱替液流速呈正相关、与围压呈负相关;煤粉在裂隙系统中的存在与运移会对其渗透率产生显著的影响;间断后重启单相流驱替作用会使煤粉产出量瞬间剧增。根据模拟实验结果可以认为,优化煤层气井的排采制度、控制井底流压降压速率的变化、稳定控制排水强度,将会有效地控制煤粉的产出量。
Bibliography:CBM wells ; coal powder output ; single-phase water flow displacement ; physical simulation
11-2190/TD
CAO Dai-yong , YAO Zheng , LI Xiao-ming, WEI Ying-chun , HU Ai-mei, SONG Bo （ 1. College of Geoscience ＆ Surveying Engineering, China University of Mining ＆ Technology （Beijing） , Beijing 100083, China ;2. College of Safety Engineering,North China Institute of Science and Technology,Beifing 101601 ,China;3. Petro China Coalbed Methane Company Limited,Beijing 100028 ,China）
For studying the output mechanism and influencing factors of coal powder during the production process in CBM （coalbed methane）wells, the physical simulation experiments about coal powder output which was under the state of single-phase water flow displacement were conducted. The dynamic output rules of coal powder was tried to be concluded by means of changing the size of displacement velocity of single-phase water flow and confining pressure between coal briquette samples, and through studying the changes of permeability rate, the weight an
ISSN:0253-9993