A Method of Obtaining Shear Coupling Stiffness of Casing-Cement Interface from Cased-Hole Sonic Logging

A technology of coupled stiffness and cased wells, applied in processing detection response signals, using acoustic/ultrasonic/infrasonic waves to analyze solids, using acoustic/ultrasonic/infrasonic waves for material analysis, etc., to achieve the effect of simplifying complexity

Active Publication Date: 2022-07-29
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 cement or between cement and formation obtained through casing wave amplitude inversion. Cut the coupling stiffness, the technical problem of quantitatively evaluating the cementing quality of the cased well with the size of the coupling stiffness

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  • A Method of Obtaining Shear Coupling Stiffness of Casing-Cement Interface from Cased-Hole Sonic Logging
  • A Method of Obtaining Shear Coupling Stiffness of Casing-Cement Interface from Cased-Hole Sonic Logging
  • A Method of Obtaining Shear Coupling Stiffness of Casing-Cement Interface from Cased-Hole Sonic Logging

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[0070] The invention utilizes the full-wave sound wave theory of casing well characterized by slip interface to simulate and predict the shear coupling stiffness of casing-cement or cement-formation interface, so as to quantitatively evaluate the gap between casing and formation from the sound wave logging data of casing well The quality of cement cementation provides a practical and feasible method and approach.

[0071] According to the casing-hole sonic logging theory based on slip interface characterization described in 5.1 below, the cementation between casing and cement or cement and formation can be characterized by the shear coupling stiffness of its interface. The casing wave amplitude gradually weakens with the increase of the interface shear coupling stiffness. There are two specific schemes for predicting the shear coupling stiffness between casing and cement interface or between cement and formation interface by using casing wave amplitude. Taking the interface be...

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Abstract

The invention discloses a method for obtaining the shear coupling stiffness of casing and cement interface from sonic logging of casing wells. The slip interface boundary condition is used to describe the non-good contact interface between casing and formation. A boundary condition was introduced into the field of cementing sonic logging, and a cementing sonic logging model characterized by slip interface was used to effectively simulate various complex coupling situations between casing and formation. Compared with the existing classical theory, the present invention can describe the sonic logging response problem under the condition of complex cementation from complete cementation to complete cementation and transition state of cement interface, and provides a new approach for solving practical application problems.

Description

technical field [0001] The invention belongs to the field of geophysical logging and oil and natural gas exploitation. Background technique [0002] Cementing is an indispensable 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 research and development and application of various detection technologies have formed an industry. Sonic logging is one of the most important evaluation techniques. It mainly uses the amplitude or attenuation of acoustic waves propagating along the casing to evaluate the cementation between the casing and the cement (the first interface) and between the cement and the formation (the second interface). degree. In the classical elastic wave theory, the layered model is often used, and the casing, cement and formation are represented by a series of columnar layered bodi...

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Application Information

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Patent Type & Authority Patents(China)
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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