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High precision digital sonic wave variable density calibration method

A calibration method and variable density technology, applied in earthwork drilling, measurement, wellbore/well components, etc., can solve the problem of difficulty in the accuracy of variable density logging tools, and achieve faster production debugging, high precision, and easy scale. production effect

Active Publication Date: 2012-07-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to further improve the accuracy of variable density logging tools with hardware circuits

Method used

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  • High precision digital sonic wave variable density calibration method
  • High precision digital sonic wave variable density calibration method
  • High precision digital sonic wave variable density calibration method

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] refer to figure 1 Schematic diagram of the structure of the variable density instrument in the standard scale cylinder, which includes an electronic circuit 1, a variable density sound system 2, a transmitting probe 3, a temperature probe 4, a receiving probe 5 and a standard scale cylinder 6. The scale cylinder is filled with water, the pressure in the cylinder reaches 2Mp, and the instrument does not limit the signal at the highest gain level.

[0022] Combine below image 3 The method flowchart of the embodiment of the present invention explains in detail the implementation of the present invention in the calibration process and the well-going process

[0023] The calibration process is as follows:

[0024] 1. Power up the instrument

[0025] 2. Reset all the correction coefficients of the sound waves to 1;

[0026] 3. ...

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Abstract

The invention relates to a high-precision digital acoustic variable density graduating method, which comprises: soaking an acoustic sonde of a variable density acoustic instrument in a graduated drum filled with water at a pressure of 2MP, or using a sine wave signal source of which the frequency is 20KHz to provide a signal without amplitude limit at a highest gain grade to a signal acquisition circuit of the instrument; fully resetting each correction coefficient of acoustic wave at each grade to be 1; acquiring several data with maximum values in a wave train, and calculating a mean value X1; using the formula X0 (40 percent)<n>Xn to calculate the correction coefficient; fading the density of the acoustic wave to 40 percent of the last grade in turn, and repeating the above steps for 8grades; and storing the correction coefficient into a storage device of the variable density acoustic instrument. Therefore, the graduation precision of the instrument does not depend on precision of a high-performance resistance network; and the method reaches the precision through calculation and correction of software, improves test running speed of the instrument, and is favorable for large-scale production of the instrument.

Description

technical field [0001] The invention relates to a high-precision digital sound wave variable density calibration method for well logging instruments used in petroleum geological exploration and metal mineral deposit exploration. Background technique [0002] Acoustic variable density logging is an important logging item in petroleum exploration. It is used to evaluate the cementing quality of cased wells. The acoustic system used by the commonly used acoustic variable density instrument is: one transmitting probe and two receiving probes. Therefore, it has The two source distances (3 feet and 5 feet) record the acoustic wave train signal of the 5-foot source distance by variable density. The depth of the gray scale on the drawing represents the magnitude of the waveform amplitude. The variable density needs to be carried out in the free casing section Scale, the instrument has 8 sound wave gain gears, according to the requirements of the scale, each gear is attenuated to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/14
Inventor 王易安刘建成贾向东邓林陈江同范林苏藏娟黄明艳杨佐新李宝华贺海龙王易敏
Owner BC P INC CHINA NAT PETROLEUM CORP
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