Method for calculating material impedance inside and outside casing pipe, determining relationship, and evaluating well cementation and device

A technology of impedance calculation and material, which is applied in the fields of material impedance calculation inside and outside the casing, cementing evaluation, and relationship determination. It can solve the problem that the acoustic wave data cannot quantitatively calculate the material impedance, and achieve improved accuracy, improved precision, and reduced material impedance errors. small effect

Active Publication Date: 2020-02-18
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a method for calculating the impedance of materials inside and outside the casing, a method for determining the relationship between the impedance of materials inside and outside the casing and Lamb wave attenuation, a method for determining the relationship between the impedance of materials inside and outside the casing and the resonance efficiency of resonance waves, a method for evaluating cementing quality, and Computer equipment can solve the problem that the acoustic wave data cannot quantitatively calculate the material impedance behind the casing when the material impedance in the cased well is uncertain

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  • Method for calculating material impedance inside and outside casing pipe, determining relationship, and evaluating well cementation and device
  • Method for calculating material impedance inside and outside casing pipe, determining relationship, and evaluating well cementation and device
  • Method for calculating material impedance inside and outside casing pipe, determining relationship, and evaluating well cementation and device

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Embodiment 1

[0040] This embodiment describes the method of solving the functional expression of the impedance of the material inside and outside the casing by using the resonance wave in the ultrasonic echo. The principle is: use measuring equipment to measure the measurement value of the resonant wave resonance efficiency of the casing under different environmental conditions, and the environmental conditions include one or more of the following: casing thickness, substances inside the casing, and substances outside the casing; according to the The measured value of resonance wave resonance efficiency inverts the second functional relationship between the material impedance inside and outside the casing and the resonance wave resonance efficiency: Zoutg=f 2 (Zing,b,H), where Zoutg represents the impedance value of the material outside the casing when the resonance wave is measured, Zing represents the impedance value of the material inside the casing when the resonance wave is measured, b...

Embodiment 2

[0070] This example describes a method for establishing the functional relationship between the attenuation of ultrasonic Lamb waves and the impedance of the material inside and outside the casing. The principle is: use Lamb wave measuring equipment to measure Lamb wave measurement values ​​under different environmental conditions, and the environmental conditions include one or more of the following: casing thickness, material inside the casing, and material outside the casing; according to the The first functional relationship between the impedance of the material inside and outside the casing and the Lamb wave is inverted by the Lamb wave measurement value: Zoutl=f 1 (Zinl,Att,H), where Zoutl represents the impedance value of the material outside the casing when the Lamb wave is measured, Zinl is the impedance value of the material inside the casing when the Lamb wave is measured, and Att is the value when the Lamb wave propagates in the casing The attenuation, H is the cas...

Embodiment 3

[0076] This embodiment describes the method of jointly solving the acoustic impedance Zin and Zout of the materials inside and outside the casing by using the Lamb wave attenuation and the resonance efficiency of the resonance wave.

[0077] It can be seen from formula (10) that the attenuation rate Att of the ultrasonic Lamb wave can be expressed as a function of Zoutl and Zinl, that is, the first function:

[0078] Att=F 1 (Zoutl, Zinl) (11)

[0079] After transforming Equation (9), Zoutg and Zing can also be used to represent the resonance efficiency of the resonant wave, that is, the second function

[0080] b=F 2 (Zoutg, Zing) (12)

[0081] In the above formula, Zoutl represents the impedance of the substance outside the casing during Lamb wave measurement, Zinl represents the impedance of the substance inside the casing during Lamb wave measurement, Zoutg represents the impedance of the substance outside the casing during resonance wave measurement, and Zing represents ...

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Abstract

Embodiments of the invention provide a method for calculating material impedance inside and outside casing pipe, a method for determining a relationship between material impedance inside and outside casing pipe and Lamb wave attenuation, a method for determining a relationship between material impedance inside and outside casing pipe and resonance wave resonance efficiency, a method for evaluatingwell cementation quality, and a computer device. The method for calculating the material impedance inside and outside casing pipe includes: setting a Lamb wave measurement device and a resonance wavemeasurement device to point to a same position inside the casing pipe, to obtain a Lamb wave attenuation measurement value and a resonance wave resonance efficiency measurement value; and obtaining avalue of the material impedance inside and outside the casing pipe through calculation according to the Lamb wave attenuation measurement value and a predetermined first function relationship betweenthe material impedance inside and outside the casing pipe and the Lamb wave attenuation, and according to the resonance wave resonance efficiency measurement value and a predetermined second functionrelationship between the material impedance inside and outside the casing pipe and the resonance efficiency. The solution in the embodiments of the invention improves accuracy of inversion of the material impedance after the casing pipe, and can simultaneously calculate acoustic impedance of a fluid material in the casing pipe.

Description

technical field [0001] This paper relates to the field of cased well cementing quality detection, especially the calculation of impedance of materials inside and outside the casing, determination of relationship, cementing evaluation methods and equipment. Background technique [0002] In the field of cased well cementing quality inspection, there are many kinds of measuring instruments, and acoustic wave instruments are the main instruments, such as: early acoustic wave amplitude, mid-term acoustic amplitude variable density logging tool (CBL-VDL), recent sectoral cement cementation Well Logging Tool (SBT). The relatively advanced cementing quality testing instruments include: Schlumberger USI ultrasonic imaging logging tool, Halliburton CAST logging tool, and China Oilfield Services Co., Ltd. multifunctional ultrasonic imager MUIL. Acoustic impedance value, according to the acoustic impedance value to determine the state of the medium (substance) behind the casing, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/40
CPCG01V1/306G01V1/40
Inventor 陶爱华王文梁程林波王明辉张勇李疾翎孙志峰梁国武陈雪莲谢景平刘临政
Owner CHINA NAT OFFSHORE OIL CORP
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