套管磁化与过套管介质识别.doc

套管磁化与过套管介质识别*
任志平,党瑞荣
(光电油气测井与检测教育部重点实验室(西安石油大学) 西安 710065)
摘要:研究套管磁化技术与套管外介质的识别方法。建立了柱状分层介质的电磁响应模型,分析了套管磁导率对电磁响应信号的影响,从理论上说明了对套管进行磁化的必要性。采用带有磁轭的纵向磁化法,对51/2英寸的套管进行了磁化,实验表明,套管被磁化后,电磁信号可有效地穿过套管,并对磁化后套管外的空气、水、盐水等不同的介质的识别进行了实验研究,结果表明,当介质不同时,根据套管内接收线圈所接收到的二次场信号的幅度和延迟时间,可有效地识别套管外的介质,从而证实了采用套管磁化法进行过套管测井的可行性,同时也为生产井的剩余油探测提供了技术支撑和理论依据。
关键词:过套管测井;磁化;电磁测量;柱状分层介质
中图分类号: 文献标识码:A 国家标准学科分类代码:
Casing ization and through casing medium identification
Ren Zhiping, Dang Ruirong
(Key Laboratory of Photoelectric Logging and Detecting of Oil and Gas, Ministry of Education
(Xi’an Shiyou University), Xi’an 710065, China.)
Abstract:This paper studies casing ization method and through casing medium identification technology. An ic response model is established for multi-cylindrical-layer; and the necessity of casing ization is theoretically demonstrated by analyzing the received signal characteristics influenced by ic permeability. In order to make ic signal rate a casing and identify different mediums, a casing of 5 1/2 inch diameter is ized in longitudinal direction by adopting a ic yoke. Test result shows that the received signals corresponding air, water and salt water are different in amplitude and delay time, which demonstrates the feasibility of through casing logging by izing the casing; and it also provides a good method for residual oil detection in production well.
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