摘要
应用套管井中多极源声波测井的理论,通过数学推导,得到了套管井内多极源激发的声场在时间域内的表达式,利用分离波数技术计算并绘制了裸眼井和套管井中水泥完全胶结好时的声波波形。理论分析表明:在套管井中利用多极源声波测井可直接测量地层横波,波形不受套管和水泥的影响,而套管波和地层纵波被充分压制。比较发现所绘波形与裸眼井的完全一致,因此可以采用与裸眼井相同的方法对地层特性进行评价。
The theory of multipole source acoustic logging has been stated, and an expression of acoustic field excited by multipole source in a cased hole in the time domain is obtained on the basis of the mathematically derivating. The acoustic waveforms in both open hole and cased hole well-cemented have been computed and plotted by using the descrete wave number technique. The theoretical analysis shows that the shear wave of formation in a cased hole can be directly measured with multipole source acoustic logs and cased wave and compressional wave of formation are inhibited. The comparision between the plotted waveforms in the cased hole by this approach and those in an open hole shows completely identical. Thus in a cased hole, the same wayas in open hole can be used to evaluate the formation properties.
出处
《江汉石油学院学报》
CSCD
北大核心
1992年第3期35-40,共6页
Journal of Jianghan Petroleum Institute
关键词
声波测井
声场
套管井
地层
评价
acoustical logging
sound fields
[cased welt]
[cased wave]
[open hole]
longitudinal waves
transversal waves