Non-linear temperature compensation method for digital sound wave variable density sonic system

A technology of temperature compensation and variable density, which is applied in the direction of earthwork drilling, measurement, borehole/well components, etc., and can solve the problem that it is difficult to obtain satisfactory and qualified transducers

Active Publication Date: 2008-12-03
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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Problems solved by technology

However, even after strict screening, it is difficult to obtain satisfactory qualified transducers

Method used

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  • Non-linear temperature compensation method for digital sound wave variable density sonic system
  • Non-linear temperature compensation method for digital sound wave variable density sonic system
  • Non-linear temperature compensation method for digital sound wave variable density sonic system

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Experimental program
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Embodiment

[0016] Such as figure 1 , 2 As shown, a digital acoustic variable density non-linear temperature compensation logging tool, the temperature sensor 3 is installed in the acoustic system 2, and its calibration and logging process are controlled by the single-chip microcomputer in the variable density electronic circuit 1. Put a newly installed acoustic wave variable density logging tool in the high-temperature and high-pressure simulation well 4. First, the temperature of the simulation well is raised from normal temperature to 160°C repeatedly to test the piezoelectric crystal transducer used in the acoustic system several times. Temperature aging test. After the piezoelectric crystal transducer is subjected to the temperature aging test, the instrument issues a calibration command to calibrate the digital sound wave variable density, and the whole process is automatically recorded by the single-chip microcomputer. The specific process is as follows:

[0017] 1. The single-c...

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Abstract

The invention relates to a nonlinear temperature compensation method for a digital acoustic variable density system, which comprises the following steps: embedding a temperature sensor in the acoustic variable density system for testing temperature-dependent characteristics of a piezoelectric transducer in the acoustic system, storing the result in a plug-pull chip, digitalizing wave train signals, measuring the current temperature of the acoustic system by the temperature sensor embedded in the acoustic system, and calibrating the temperature of the digitalized wave train data according to the calibration value of a temperature characteristic table of the acoustic system to generate calibrated acoustic variable density wave train signals irrelevant to the environmental temperature. Accordingly, the change of a piezoelectric transducer in the acoustic system can be subjected to temperature compensation only by measuring the current temperature of the acoustic variable density system and using a pre-calibrated calibration coefficient of the temperature characteristic calibration table of the acoustic system without changing the piezoelectric crystal transducer acoustic system and screening the temperature property, thus eliminating the influence of the temperature on the acoustic variable density.

Description

technical field [0001] The invention relates to a non-linear temperature compensation method of a digital sound wave variable density sound system which is used to solve the problem of temperature-affected sound wave variable density logging tools for petroleum geological exploration and metal mineral deposit exploration. Background technique [0002] Acoustic variable density logging tool is a logging tool to evaluate the cementing quality according to the attenuation amplitude of the acoustic signal, so there are strict requirements on the stability of the signal amplitude of the acoustic system within the working temperature range. At present, the piezoelectric crystal transducers used in acoustic logging tools are greatly affected by temperature, and the acoustic system assembled by piezoelectric crystal transducers must work at a high temperature at the bottom of the well above 155°C. The sound wave signal emitted by the sound system and the sound wave signal received a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/06
Inventor 王易安刘建成贾向东邓林陈江同范林苏藏娟黄明艳贺海龙王易敏杨佐新李宝华李文东
Owner BC P INC CHINA NAT PETROLEUM CORP
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