摘要
钻柱振动声波录井(DVL)技术经过多年的研究已经取得了可喜的成果。为了验证不同岩石样本在钻头的破碎作用下,其振动声波信号的响应特点.在石油大学(华东)水射流实验室开展了模拟钻机状态下的实验研究,其内容涉及:通过施加不同钻压和转速.观察在PDC钻头的切削下吉波频率是否随之变化;钻柱是否为钻头破岩时振动声波的良好载体;岩石破碎的高频振动声波信号是否可以在钻柱的顶部截获;数据采集通过无线方式传输是否可行等。通过实验证实。钻压、转速的改变与破碎岩石的信号频率是不相关的。从5个岩石样本检测所获得的时间频谱图上看,它们有明显的界面和相对稳定的频域分布.其中:砂岩具有较低的频谱峰,振动能量主要集中在频域的低频部分;泥页岩的振动声波频率峰比砂岩高;水泥2号样品与泥页岩频谱峰分布基本相同.但从频谱上看。能量集中度较高,与泥页岩有较大的区别:水泥1号样品有较宽的频谱分布.尤其是低频段部分.有别于其他岩样.证明它具有较多的杂质结构;大理石的频谱峰分布较高。从获得的各类数据上看,说明DVL技术原理和方法是可行的.相应的数据处理软件及传感器、无线信号传输器及过滤器是可靠的.且数据具有很好的重复性.钻柱振动声波录井技术具有广阔的应用前景.进一步研究和开发尤其适用于PDC钻头快速钻进的录井需要。
Through many years' studies,DVL(drilling vibration sonic logging)technique has made gratifying achievements. In order to verify vibration sonic signal response character- istics of different rock samples at the bit crushing effects, the experimental studies in a state of simulated drilling rig were conducted at China University of Petroleum (Hua- dong) Water Jet Laboratory,the content included through exerting different weight on bit and rotary speed,whether sonic frequency was observed to change with PDC bit sharp- ening,whether drill string was a good vibration acoustic wave carrier for bit breaking rock,whether high frequency vibration acoustic signal for rock breaking can be captured at the top of drilling string,and whether it was feasible that data acquisition can be transmitted through wireless mode. The experiment proved that the changes of weight on bit and rotary speed were irrelevant to the breaking rock' s sig- nal frequency.In view of temporal spectrum of the detected five rock samples,they had obvious interface and relatively stable frequency domain distribution,among them,sand- stone had relatively low spectrum peak,vibration energy mainly concentrated on the low frequency domain,vibration sonic frequency peak of mud shale was higher than sand- stone,frequency spectrum peak distribution for No.2 ce- ment sample was basically same as mud shale' s.but seen from spectrum,the degree of energy concentration was high and it was very different from mud shale,No.1 cement sample had a wider spectrum distribution,especially low band was different from other rock samples,it proved that this part had more impurity structure,and spectrum peak distribution for marble was higher.The obtained data proved that DVL technical principle and method were feasi- ble,the corresponding data processing software,sensors, wireless signal transmission device and filter were reliable, and data had good repeatability.Drilling string vibration sonic logging has the wider applied prospect,further stud- ying and developing this tec
出处
《录井工程》
2008年第4期1-5,25,共6页
Mud Logging Engineering
关键词
钻柱振动声波录井
模拟
实验
研究
频谱
drill string vibration sonic logging
simulation
experiment
study
spetrum
