Acoustic logging-while-drilling device and acoustic logging-while-drilling method

Abstract

The invention relates to an acoustic logging-while-drilling device and an acoustic logging-while-drilling method. The device comprises a drill collar, an acoustic wave transmitting transducer, a near-spacing acoustic wave receiving transducer, a sound insulator, far-spacing acoustic wave receiving transducer arrays and a control system, wherein acoustic wave signals radiated by the acoustic wave transmitting transducer are propagated in a well wall stratum at which the drill collar is positioned and outside a well; The near-spacing acoustic wave receiving transducer is used for receiving reflected wave signals reflected into the well by a stratum interface beside the well; and the first and second far-spacing acoustic wave receiving transducer arrays are used for receiving acoustic wave signals reflected into the well by the stratum interface beside the well and slide wave signals propagated along the well wall stratum; and the control system controls the acoustic wave transmitting transducer to transmit the acoustic wave signals and performs data processing on the acoustic wave signals of the near-spacing acoustic wave receiving transducer and the far-spacing acoustic wave receiving transducer arrays so as to obtain the lateral distance and azimuth from a well shaft to the stratum interface beside the well. The acoustic logging-while-drilling device is easy for realization of a control circuit, can be used for evaluating the distance and azimuth from a geologic structure body beside the well to the well shaft and is high in engineering application value.

Description

technical field [0001] The invention belongs to the field of applied geophysical well logging, and in particular relates to an acoustic logging while drilling device and method, which are used for determining the distance and orientation of the geological interface beside the well. Background technique [0002] With the increasing demand for exploration and development of oil, natural gas, and mineral deposits and the development of logging technology, more and more highly deviated wells and horizontal wells appear. During the real-time drilling of these wells, in order to improve the accuracy of drilling construction and drilling efficiency, to ensure that the wellbore passes through the production layer and avoid unnecessary losses, it is necessary to effectively track the relative spatial position of the upper and lower boundaries of the formation, and detect the formation boundary information near the drill bit during the drilling process to determine the next step and po...

AI Technical Summary

Problems solved by technology

Although the sound source emission method using the circular arc acoustic radiator enhances the directional radiation ability of the acoustic pulse, the complexity of the control circuit increases, the volume is larger, and the power consumption is significantly increased compared with the traditional excitation mode. For underground high temperature and narrow space For the environment while drilling, it is relatively difficult to realize the project. In addition, in order to ensure the full range of 360° coverage of the circular arc acoustic radiator on the formation medium around the well, the speed measurement while drilling will be reduced.

[0004] In summary, it is difficult to obtain an optimal wellbore trajectory based on the current measurement-while-drilling system, especially in thin reservoirs, it is even more difficult

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