Development and Testing of Acoustic Nipples While Drilling
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摘要: 为满足钻井过程中对地层压力实时监测和地质力学计算的需要,开展了随钻声波测量关键技术研究,研制了随钻声波测井声系短节。该短节内外径分别为57.2 mm和171.0 mm,采用"一发两收"的工作模式,发射声系安装一个单极子发射换能器,接收声系安装2个接收器,每个接收器由4个宽频接收换能器组成。发射声系和接收声系采取分离式设计,声波发射器和接收器之间的距离可以调整,接收器之间的距离固定为200 mm。利用声波测量试验装置测试发现,发射声系的声波激发频率为12.92 kHz,声场指向性图近似于一个椭圆,接收声系的8个接收换能器的谐振频率为30.84~33.53 kHz,平均谐振频率为32.23 kHz;利用该短节和随钻声波测量电路获得了试验套管井的声波全波列波形,计算得到套管的声速为5 100 m/s。随钻声波测井声系短节的成功研制,为国内随钻声波测井仪器的开发提供了新的技术思路。Abstract: In order to satisfy the requirement for real-time formation pressure monitoring and geomechanical parameters calculation, an acoustic nipple while drilling was developed based on the analysis of key technologies of acoustic measurement while drilling. The internal and external diameters of the nipple are 57.2 mm and 171.0 mm,respectively. It has one emitter and two receivers in operation mode. The emitting acoustic system is equipped with one monopolar sub-emitting transducer, and the receiving acoustic system is equipped with two receivers with four broad-band receiving transducers for each. The emitting and receiving acoustic systems consist of two separated parts. The spacing between the emitter and the receiver can be changed, but it is fixed at 200 mm among receivers. Based on the test of acoustic measurement,acoustic excitation frequency of emitting acoustic system is 12.92 kHz and its directivity pattern is similar to an ellipse. In the receiving acoustic system, the resonance frequency of eight receiving transducers is in the range of 30.84-33.53 kHz, averaging 32.23 kHz. The full wave form of the cased hole in the test was recorded by using the nipple and the acoustic measurement circuit while drilling, and the calculated acoustic velocity was 5 100 m/s. The successful development of the acoustic nipple while drilling will provide significant technical data for the development in China of acoustic logging devices while drilling.
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