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A data acquisition method for azimuth acoustic logging while drilling

A technology of logging data and collection method, which is applied in the fields of earthwork drilling, seismology for logging records, measurement, etc. Effect

Active Publication Date: 2018-10-23
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0008] In view of the above problems, the present invention provides a method for collecting azimuth acoustic logging data while drilling, which adopts the azimuth and equal interval measurement mode to collect data, and realizes the balanced coverage of data in different sectors with the rotation of the drilling tool, thereby improving the efficiency of data processing and imaging. It overcomes the problem that the azimuth sector data coverage is affected by the rotation speed and drilling speed of the drilling tool and the data coverage of different sectors is not balanced in the fixed time interval measurement mode adopted by the existing azimuth acoustic logging acquisition technology while drilling

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Embodiment 1

[0032] figure 1 It is a schematic diagram of the acquisition mode of azimuth acoustic wave and azimuth at equal intervals while drilling, figure 1 Shown is a cross-section of the position of the transmitting transducer, the tool is in the middle of the borehole, and the transmitting transducer is rotated around the axis of the tool during drilling, figure 1 Shown is a dipole emission source, including 2 emission transducers, or a polariton emission source, only using one of the emission transducers to work, the circular hole in the middle of the instrument provides mud passage, and the angle θ is the emission Transducer axis and instrument tool face angle reference value θ 0 The angle between the positions.

[0033] Set the azimuth interval as Δθ, Δθ=360 / m, m is the number of measurement sectors, taking the number of imaging sectors as 16 as an example, then Δθ=22.5°. Instrument tool face angle reference value θ 0 =0°, that is, for the gravitational tool face angle, the ax...

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Abstract

The invention belongs to the technical field of logging-while-drilling, and in particular relates to a data acquisition method of azimuth acoustic logging while drilling. When the acoustic logging while drilling tool rotates with the drilling tool at a certain depth, the azimuth equal interval mode is used to collect data: the well circumference is divided into m sectors with the azimuth interval Δθ, when the tool face angle of the acoustic logging while drilling tool is at In the kth sector, control the acoustic wave emission source to emit the acoustic wave signal, and the acoustic wave receiver measures the acoustic wave signal and digitizes it and stores it as the data of the kth sector; sequentially collects data in each sector, and in each sector After collecting N times of data, the data collection of the current depth is completed. At the same time, as the drilling tool rotates and drills, the instrument collects acoustic wave data at different depths, and processes them to realize azimuth acoustic wave imaging. The invention overcomes the problem that the azimuth sector data coverage is affected by the rotation speed and drilling speed of the drilling tool when the fixed time interval measurement mode is adopted in the existing acquisition technology, and realizes the balanced coverage of different sector data.

Description

technical field [0001] The invention relates to the technical field of logging-while-drilling, in particular to a data acquisition method of azimuth acoustic logging while drilling. Background technique [0002] The sonic wave while drilling, the resistivity while drilling, and the radioactivity while drilling constitute the main body of the logging while drilling technology. The cost of logging, its unique logging method can meet the needs of highly deviated wells, horizontal wells and deep water drilling. Acoustic logging while drilling can obtain information closer to the original formation in time, which can be used to calculate rock mechanical properties, predict formation pore pressure, evaluate wellbore stability, and explain lithology changes, providing important information for accurately evaluating reservoirs and optimizing drilling trajectories. means. [0003] Since the sonic logging while drilling technology was put into production in the 1990s, it has experie...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/46E21B47/00
CPCE21B47/00G01V1/46E21B47/022E21B49/00G01V1/52G01V2200/16E21B47/18
Inventor 陈文轩张文秀底青云王自力孙云涛郑健杨永友
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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