煤层气井管式泵临界沉没度试验分析  

Experimental Analysis of Critical Submergence of CBM Well Tubing Pump

作　　者：张芬娜[1] 綦耀光[1] 吴建军[1] 莫日和[2] 刘冰[1] 

机构地区：[1]中国石油大学(华东)机电工程学院 [2]中联煤层气有限责任公司

出　　处：《石油机械》2012年第12期73-76,112,共5页China Petroleum Machinery

基　　金：国家科技重大专项"柳林示范区煤层气井高效排采工艺技术研究"(2011ZX05062-004);中央高校基本科研业务费专项基金资助项目(10cx03010A)

摘　　要：建立了煤层气井管式泵泵阀开启的临界条件模型,通过泵阀的水力损失计算,以最大水力损失作为泵阀开启的最低条件,得到了泵在不同工况条件下的临界沉没度。借助煤层气排采井模拟试验系统进行试验,得到了不同冲次下沉没度与泵效和排液量的关系曲线。分析试验曲线可知,随着冲次的提高,泵的临界沉没度增加,泵效降低,主要原因是随着冲次的提高,固定阀的损失增大,导致临界沉没度增大;冲次变化对临界沉没度影响较小,临界沉没度受到泵径的影响,泵径不同临界沉没度不同;煤层气井排采时可以根据泵效变化率的大小选择合理的沉没度。The critical condition model for the tubing pump valve opening of coal bed methane （CBM） well was established. Through calculation of hydraulic loss of the valve the maximum hydraulic loss was taken as the mini- mum condition for valve opening. The critical submergence depth of the pump was obtained under different operating conditions. The simulation test system of CBM drainage production well was used to carry out the test to obtain the relation curve of submergence to pump efficiency and lifting rate at different pumping speed. An analysis of the test curve indicates that with the increase of pumping speed the critical submergence depth of the pump increases and the pump efficiency decreases. The main reason is that with the increase of pumping speed the loss of standing valve increases, leading to the increase of the critical submergence depth. The change of pumping speed does not have remarkable effect on the submergence depth, which is affected by pump diameter. The reasonable submergence depth can be chosen according to the pump efficiency change in CBM well drainage and production.

关 键 词：煤层气井 管式泵 临界沉没度 水力损失 固定法 

分 类 号：TE933[石油与天然气工程—石油机械设备]