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Method and system for rectifying sound wave pressure in sound wave amplitude well logging

An environmental pressure, sound wave technology, used in surveying, earthmoving, wellbore/well components, etc., can solve different problems that affect the accuracy of measurement

Inactive Publication Date: 2012-01-25
CNPC GREATWALL DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During well logging, the cable shaft voltage of the acoustic logging tool will fluctuate; even if the power supply voltage of the well site equipment is stable, the power sources used by different test teams at different times may be different when measuring at the well site. Through voltage correction, all Batches of measurement data are calibrated under the same reference voltage, which is meaningful for the repeatability of well site measurements
In addition, changes in the measured depth will lead to differences in environmental pressure, and this change is reflected in the amplitude of the first wave. If not corrected, this amplitude change is not related to the cement bonding conditions of the casing and behind the casing, and the lithology of the formation. The amplitude changes of the first wave are intertwined, which will affect the accuracy of the measurement

Method used

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  • Method and system for rectifying sound wave pressure in sound wave amplitude well logging
  • Method and system for rectifying sound wave pressure in sound wave amplitude well logging
  • Method and system for rectifying sound wave pressure in sound wave amplitude well logging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0140] Suppose a logging team measures a well and obtains the following data:

[0141] The logging environment pressure parameter is ρh 1 =4.7841×10 5 kg / m 2 , the crystal emission voltage monitored at the same time is 7100V, and the amplitude of the sound wave received at 3feet (here takes the first wave as an example) is 1200mV.

[0142] First, in the instrument's Figure 4 The ambient pressure parameter found in the "voltage-amplitude" characteristic curve is 4.7841×10 5 kg / m 2 The curve (in practice may not be exactly 4.7841×10 5 kg / m 2 curve, but according to Figure 4 This curve can be easily found by interpolation), then the coefficient of the "voltage-amplitude" relationship curve is

[0143]

[0144] where μ 1 =0.1673, and the actual measured data is: v 1 =7100V, p 1 =1200mV,

[0145] Substitute these parameters and data into equation (6) to obtain the acoustic amplitude p after the emission voltage correction alone a The value of:

[0146] =1200-0....

Embodiment 2

[0169] Suppose a logging team measures a well and obtains the following data:

[0170] The logging environment pressure parameter is ρh 1 = 1.4071×10 5 kg / m 2 , and the monitored crystal emission voltage is 6500V, and the amplitude of the sound wave received at 3feet (here takes the first wave as an example) is 980mV.

[0171] First, in the instrument's Figure 4 The ambient pressure parameter found in the "voltage-amplitude" characteristic curve is 1.4071×10 5 kg / m 2 The curve of (in practice may not be exactly 1.4071×10 5 kg / m 2 curve, but according to Figure 4 This curve can be easily found by interpolation), then the coefficient of the "voltage-amplitude" relationship curve is

[0172]

[0173] where μ 1 =0.163, while the actual data measured is: v 1 =6500V, p 1 =980mV.

[0174] Substitute these parameters and data into equation (6) to obtain the acoustic amplitude p after the emission voltage correction alone a The value of:

[0175] =980-0.163(6500-70...

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Abstract

The invention relates to a method and a system for rectifying sound wave pressure in sound wave amplitude well logging. In order to strengthen the comparability of the well logging data of each place or the well logging data of different depth sections in the same well, a relationship curve group between environment pressure and a receiving sound wave amplitude is obtained by aiming at different transmission voltages loaded on a transmitting transducer during well logging; the environment pressure is measured, and the transmission voltage and the receiving sound wave amplitude of the transmitting transducer are measured under the environment pressure; according to the transmission voltage, a corresponding curve and a multinomial coefficient which represents the curve are found from the relationship curve group; and according to the formula, the sound wave amplitude is solved after the environment pressure is rectified, wherein p1 represents a received sound wave amplitude, ki represents the multinomial coefficient of the curve, phi h2 represents the environment pressure, phi h2 represents the standard environment pressure which needs to be normalized, and n is a natural number. According the method and the system, precise well logging data is accurately compared, and oil selection position and oil discharge depth can be accurately selected with the help of the method and the system in the invention.

Description

technical field [0001] The present invention relates to a method and system for correcting sonic ambient pressure in sonic amplitude logging, wherein the ambient pressure represents the pressure exerted on a logging device as a function of logging depth. Background technique [0002] The extraction and utilization of acoustic amplitude information occupies a very important position in modern logging technology, in cased well logging (such as cement-bonded CBL, variable density logging VDL, cemented sonic imaging, etc.) and open-hole well logging (such as Acoustic full-wave train logging, dipole and multipole array sonic logging, sonic downhole TV and ultrasonic imaging logging, sonic tomography, etc.) have applications. The extraction of acoustic wave amplitude information is often achieved by measuring the first peak or trough of the first arriving acoustic wave (called "first wave"). [0003] In the article <<The Principle and Application of Acoustic Logging>>...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/14E21B49/00
Inventor 鲍雪山桑强肖加奇白庆杰潘良根陶钧
Owner CNPC GREATWALL DRILLING ENG