Method and system for measuring cementing quality of cased well by utilizing SH waves
A cased well and cementing glue technology, which is applied in construction and other directions, can solve problems such as loss, large amount of water produced by perforation, error economy, etc.
Pending Publication Date: 2021-04-02
BEIJING HUAHUI GEOXPLORA TECH CO LTD
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Problems solved by technology
This situation will cause a large amount of water to flow out due to fluting after perforation
Such examples often occur in various oilfields across the country, seriously affecting normal oilfield production, especially in key exploration wells and ultra-deep wells, causing major mistakes and economic losses
Method used
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Embodiment 1
[0085] This embodiment provides a method for measuring the cementation quality of cased well cementing by using axisymmetrically excited SH waves, including the following steps:
[0086] First, use the axisymmetric SH wave transmitting probe 1 that can excite the circumferential displacement to push against the borehole wall, such as figure 2 shown. This transmitting probe 1 is composed of multiple arms, and each arm is equipped with a shear component excitation vibrator (the polarization direction is along the circumferential direction, and the electrode direction is along the radial direction). The walls excite vibratory displacements in the circumferential direction. The excitation vibrators on all arms on the entire circumference 4 are simultaneously excited, and at the same time, a vibration displacement in the circumferential direction is generated on the inner wall of the casing, as shown by the arrow on the circumference 4, and the displacement excited by each vibrat...
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The invention relates to a method and a system for measuring cementing quality of a cased well by utilizing SH waves. The method comprises the following steps of: pushing a transmitting probe to the well wall in the cased well, and exciting the SH waves on the inner wall of a casing through the transmitting probe; pushing a receiving probe to the well wall at a set spacing position, and receivingthe SH waves in the casing along the circumferential direction through the receiving probe; judging whether the amplitude of the received SH waves is greater than a set amplitude threshold value or not; if so, indicating that the cementing quality of an interface I or an interface II is poor; if not, indicating that the cementing quality of the interface I and the interface II is good; when the cementing quality of the interface I or the interface II is poor, acquiring a frequency dispersion curve through a plurality of receiving waveforms; and determining an interface cementing quality resultaccording to the shape and the number of the frequency dispersion curve, wherein the interface cementing quality result is poor in cementing quality of the interface I and the interface II. Accordingto the method and the system, the SH waves on the inner wall of the casing are directly measured, and the method and the system are sensitive to water layers on the interface I and the interface II of the cased well, so that the cementing quality can be accurately and effectively measured and evaluated.
Description
technical field [0001] The invention relates to the field of cementing quality measurement of casing well cementing, in particular to a method and system for measuring the cementing quality of casing well cementing by using SH wave. Background technique [0002] In the process of oil exploration and development, it is necessary to cement the drilled downhole casing and the casing to bond the casing and the formation together. The quality of well cementing is of great significance to crude oil production. The detection of cementing quality is now only sound amplitude and variable density logging and SBT logging. The acoustic amplitude and variable density logging evaluate the cementing quality by measuring the casing wave amplitude excited by the centered acoustic source. The premise is that the instrument needs to be centered, and the frequency range excited by the transmitting probe in the instrument must be within the frequency range where casing waves exist. The first ...
Claims
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Inventor 沈永进汪文洁
Owner BEIJING HUAHUI GEOXPLORA TECH CO LTD