While-drilling three-dimensional reflected-sound-wave imaging logging phased array sound source device and method

A three-dimensional reflection and imaging logging technology, applied in the field of petroleum geophysical exploration, can solve the problems of low dipole sound source and limited application range, and achieve the effects of low side lobe level, obvious main lobe and high signal-to-noise ratio.

Active Publication Date: 2015-12-30
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

The frequency of the dipole sound source is low (2kHz-5kHz), this method can detect the formation farther away, and the detection depth reaches 20m-30m, but its directivity curve is approximately "∞" The detection of azimuth has 180° multiple solutions, which limits its application range

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  • While-drilling three-dimensional reflected-sound-wave imaging logging phased array sound source device and method

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[0032] The principle and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are given only to enable those skilled in the art to better understand and implement the present invention, rather than to limit the scope of the present invention in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0033] According to an embodiment of the present invention, a phased array sound source device and method for three-dimensional reflected acoustic wave imaging logging while drilling are proposed.

[0034] In this paper, the array element includes, but is not limited to, devices such as piezoelectric vibrators that emit sound waves through vibration. In addition, any number of elements in the drawings is used for illustration rather than limitation, and any ...

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Abstract

The invention provides a while-drilling three-dimensional reflected-sound-wave imaging logging phased array sound source device and method. A system comprises a sound source device body, a calculation unit and an exciting unit. The sound source device body comprises a plurality of phase control arc arrays sequentially arranged in the axial direction of a drill collar. Each phase control arc array comprises a plurality of array units circumferentially and evenly installed on the outer surface of the drill collar, and the array units are in arc sheet shapes. The calculation unit is used for calculating control parameters including amplitude weights of excitation signals corresponding to the array units in the phase control arc arrays, delay time generated when the excitation signals are applied to the adjacent array units in the phase control arc arrays, and delay time generated when the excitation signals are applied to the adjacent array units in the sound source device body in the axial direction of the drill collar. The exciting unit is used for exciting the array units in the sound source device body according to the control parameters calculated by the calculation unit to vibrate to emit sound waves. By means of the device and method, the sound waves can be directionally radiated in any direction in a stratum nearby a well, a main lobe of a directivity pattern is obvious, the level of a side lobe is low, the orientation resolution ratio is high, the detection distance is large, and the signal-to-noise ratio is high.

Description

technical field [0001] Embodiments of the present invention relate to the field of petroleum geophysical exploration, and more specifically, embodiments of the present invention relate to a phased array sound source device and method for three-dimensional reflected acoustic wave imaging logging while drilling. Background technique [0002] This section is intended to provide a background or context for implementations of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] With the increasing demand for exploration and development of deep-sea oil reserves and complex oil and gas reservoirs, the industry has put forward more requirements for acoustic logging technology. The currently developed single-well reflected acoustic wave imaging logging (remote detection) technology can image the stratum structure and geological bodies within the range of several meters to tens of meters near the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/04G01G23/42
Inventor 车小花乔文孝柴细元鞠晓东王志勇卢俊强王瑞甲
Owner BC P INC CHINA NAT PETROLEUM CORP
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