摘要
随钻地层压力测试可在钻井的过程中实时提供地层压力信息,达到提高钻井效率,优化钻井工艺的目的。但由于钻井过程中泥浆滤液侵入地层,造成近井地带地层出现增压效应,增压效应导致随钻地层压力测试结果失真。因此.针对随钻地层压力测试过程中存在的增压效应,分析增压效应产生的主要原因和形成机理,建立了泥饼形成条件下增压压力的理论模型,采用该模型模拟了不同地层、地层流体、泥饼和井筒环境下的增压响应规律,揭示了随钻地层压力测试增压效应的响应机理。研究表明,地层渗透率、泥饼渗透率和过平衡压力的大小是影响增压效应的主要因素,在地层渗透率较低。
While-drilling formation pressure testing can provide real time information of formation pressure, which can improve the drilling efficiency and optimize drilling technology. When while-drilling formation pressure testing is conducted, mud cake is formed against the borehole wall because of the mud loss, which is the reason for the supercharging effect around the wellbore and has a great influence on formation pressure data. This paper has analyzed the primary reason and mechanism of supercharging effect, and built a theoretical model of supercharging effect in mud cake condition on the basis of supercharging mechanism. Supercharging effect response rules were simulated under different formation, formation fluent, mud cake and wellbore conditions, which revealed the response mechanism of supercharging effect in while-drilling formation pressure. Our research shows the main factors which have a significant influence on supercharging effect are formation permeability, mud cake permeability and overbalance pressure. Supercharging effect will obviously increase in low formation permeability, high mud cake permeability conditions.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第3期117-123,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
中国石油长庆油田合作项目"苏里格气田水平井长水平段井下工程参数测量与完井管柱适应性研究"(12ZJ-KF-001)
关键词
随钻测量
地层压力
增压效应
响应机理
钻井
measurement while drilling
formation pressure
supercharging effect
response mechanism
drilling
