Method for obtaining casing and cement interface shear coupling stiffness from cased well acoustic logging

A coupled stiffness, cased well technology, applied in the processing of probed response signals, analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, etc.

Active Publication Date: 2021-01-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for obtaining the shear coupling stiffness of casing and cement interface from cased well acoustic logging, so as to solve the problem of shear coupling stiffness between casing and

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  • Method for obtaining casing and cement interface shear coupling stiffness from cased well acoustic logging
  • Method for obtaining casing and cement interface shear coupling stiffness from cased well acoustic logging
  • Method for obtaining casing and cement interface shear coupling stiffness from cased well acoustic logging

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Embodiment Construction

[0070] The present invention uses the cased well acoustic full-wave theoretical simulation and prediction of the casing-cement or cement-formation interface shear coupling stiffness characterized by the slip interface, and is used to quantitatively evaluate the relationship between the casing and the formation from the cased well acoustic logging data. Cement bonding quality provides a practical and feasible method and approach.

[0071] According to the cased hole acoustic logging theory based on the characterization of the slip interface described in 5.1 below, the bonding status between casing and cement or between cement and formation can be characterized by the shear coupling stiffness of the interface. With the increase of interface shear coupling stiffness, the casing wave amplitude gradually weakens. There are two specific schemes for predicting the shear coupling stiffness between casing and cement interface or cement and formation interface by using casing wave ampli...

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Abstract

The invention discloses a method for obtaining casing and cement interface shear coupling stiffness from cased well acoustic logging. A sliding interface boundary condition is adopted to describe a non-good contact interface between a casing and a stratum, and the boundary condition is introduced into the field of well cementation acoustic logging. A well cementation acoustic logging model characterized by a slip interface is adopted to effectively simulate various complex coupling conditions of the casing and the stratum. Compared with an existing classical theory, by using the method of theinvention, an acoustic logging response problem of the cement interface under a complex cementing condition from complete non-cementing to complete cementing and in a transition state can be described, and a new way is provided for solving practical application problems.

Description

technical field [0001] The invention belongs to the fields of geophysical well logging and oil and natural gas exploitation. Background technique [0002] Well cementing is an essential part of well completion engineering in the petroleum industry. The quality of cementing is related to the life of oil and gas wells, safe production and overall benefits. In order to accurately evaluate the quality of cementing, the development and application of various detection technologies has formed an industry. Acoustic logging is one of the most important evaluation techniques. It mainly uses the amplitude or attenuation of the acoustic wave propagating along the casing to evaluate the cementation between casing and cement (first interface) and between cement and formation (second interface). degree. In the classic elastic wave theory, the layered model is often used, and the casing, cement and formation are represented by a series of columnar layered bodies; when the first or secon...

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Application Information

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IPC IPC(8): G01N29/04G01N29/44G01N29/48
CPCG01N29/04G01N29/4418G01N29/48G01N2291/0232
Inventor 陈雪莲江灿苏远大李盛清饶博唐晓明
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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