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Multipole combined logging-while-drilling mode and signal transceiving synchronization method

A multi-pole, drilling and logging technology, which is applied in the directions of surveying, earthwork drilling, borehole/well components, etc., can solve the problems that it is difficult to take into account the full wave train measurement and azimuth imaging, so as to enrich formation evaluation information and improve measurement efficiency effect

Active Publication Date: 2018-12-11
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The purpose of the present invention is to propose a combined logging mode method and the combined logging mode of the acoustic wave multipole logging device while drilling, aiming at the disadvantage that the existing acoustic logging while drilling technology is difficult to take into account the full wave train measurement and azimuth imaging The synchronous method of signal transmission and reception under the combined logging mode can simultaneously realize the full wave train measurement and azimuth imaging of P-wave, shear wave and Stoneley wave, and the synchronous method of signal transmission and reception under the combined logging mode can ensure Acoustic multipole logging device works according to established procedures

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  • Multipole combined logging-while-drilling mode and signal transceiving synchronization method

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0051] Such as figure 1 As shown, the acoustic wave multipole logging device while drilling includes a transmitting transducer, a sound insulator, a receiving transducer array, and a transmitting and receiving control and communication unit.

[0052] The transmitting transducer is a group (usually 4) of transducers installed on the surface of the drill collar. The four transducers are evenly distributed on the circumference of the drill collar at 90° intervals, and are located on the same plane perpendicular to the axis of the drill collar. In the plane, as shown in the figure, transducer A, transducer B, transducer C, and transducer D are respectively aligned to the directions of 0°, 90°, 180°, and 270° of the drill collar circumference.

[0053] The sound insulator is located between the transmitting transducer and the receiving transducer array, and...

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Abstract

The invention relates to a combined logging mode of a multipole logging-while-drilling device. The combined logging mode which comprises a drilling logging mode and a lifting logging mode is providedaccording to the actual needs of well drilling operation, full wave train measuring and orientation imaging of stratum longitudinal waves, transverse waves, Stoneley waves and the like can be achievedat the same time, and rich stratum evaluation information can be provided. Aiming at the fact that the working diameters of the different modes of the combined logging mode are different and transmitting and receiving need to be controlled synchronously, the invention further provides a signal transceiving synchronization method combining transceiving communication and synchronous control, the fact that the multipole logging-while-drilling device works according to set flow under each working mode and during the switching of different modes is guaranteed, and measuring efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of acoustic logging while drilling, in particular to a logging mode of acoustic wave multipole combination while drilling and a method for synchronizing signal sending and receiving in the combined logging mode. technical background [0002] The acoustic logging while drilling technology measures the compressional wave and shear wave velocity of the formation while drilling. These two elastic wave velocities provide important information for the exploration and development of underground oil and gas resources, including pore pressure, overburden pressure gradient, lithology, Rock mechanical properties, etc. At the same time, compared with the wireline acoustic logging technology, the acoustic wave while drilling reduces the occupation time of the drilling rig at the well site, improves the drilling efficiency, and reduces the drilling safety risk, which can meet the needs of highly deviated wells, horizontal...

Claims

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Application Information

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IPC IPC(8): E21B47/14
CPCE21B47/14
Inventor 张文秀陈文轩王自力底青云孙云涛郑健杨永友
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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