摘要
在水平井钻井与完开过程中，由于水平井段易形成岩屑床，油气层受钻井液、完并液的浸泡时间长等原因，水平并油气层损害已成为影响其产能发挥的一个重要问题。从分析造成水平共油气层损害的主要因素出发，提出了减少水平井油气层损害的措施和技术。同时通过建立相应的理论分析模型并进行求解，分析计算了影响水平井产能的各种因素，分析对比了水平井与垂直井的产量降低幅度。分析结果表明：①油气层损害是影响水平井产能的一个重要原因；②钻井液、完井液对油气层造成损害后，损害带对水平井产量的影响将比垂直井更为严重，可通过计算流动效率值的大小米评价损害程度；③一般而言，水平井对油气层损害的敏感性较垂直井差，但如果水平井段发生严重的油气层损害，水平井的产能将大大降低，且损害难以治理。最后探讨了解决该问题的相应保护技术。
Formation damage, during drilling and completion of horizontal wells, has been a serious problem which affects the production capacity of pay zones in horizontal wells, because of cutting's bed forming on bottom side of horizontal wells and drilling and well completion fluids invading into formation. This paper presents an analysis of the main factors of influencing formation damage in horzontal wells, introducing the particular techniques to prevent or release the damage. A mathematical model was established to calculate and compare the damage degree between horizontal and vertical wells. Analysis results show that: (1) formation damage is an important reason affecting the production capacity of horizontal wells; (2) the damage zone, caused by drilling and well completion fluids invasion, made a more serious damage in horizontal wells than in vertical wells ; (3) in general, the sensitivity to formation damage in horizontal wells are Iess than that in vertical wells, nevertheless, once the horizontal well is damaged, the production capacity of the horizontal well will decline obviously and it is hard to treat. The paper also discussed the techniques to prevent the formations in horizontal wells from damage.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1997年第4期68-71,共4页
Petroleum Exploration and Development
关键词
水平井
防止地层损害
油气层
保护技术
Horizontal well, Reservoir production, Skin factor, Permeability anisotropy, Vertical well, Comparison,(Flow efficiency)
