Array acoustic logging well cementation quality evaluation interpretation chart based on cased well response

A technology for array acoustic logging and quality evaluation, which can be used in construction and other directions to solve problems such as oilfield stringing

Pending Publication Date: 2022-03-25
TIANJIN UNIV
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Problems solved by technology

However, in the process of oilfield development, cross grooves often occur

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  • Array acoustic logging well cementation quality evaluation interpretation chart based on cased well response
  • Array acoustic logging well cementation quality evaluation interpretation chart based on cased well response
  • Array acoustic logging well cementation quality evaluation interpretation chart based on cased well response

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Since the quality of cementing is related to oilfield production, people's life and property and public safety, people attach great importance to its detection. For this reason, the law of acoustic wave propagation in cased holes has been deeply studied. Various mode waves measured in cased hole fluids are summarized. The patent of the present invention finds from the two-dimensional spectrum of the fluid response in the well when there is a water ring at the I interface (casing and cement sheath) of the cased well: the mode wave propagating in the casing is coupled with the mode wave propagating in the fluid in the well to form a cased well mode The peak amplitude of the wave spectrum is sensitive to the thickness of the water ring. It is also found that the shape of the cased-hole mode wave spectrum (varied with frequency and wavenumber) also varies with the...

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Abstract

The invention discloses an array acoustic logging well cementation quality evaluation interpretation chart based on cased well response, which is composed of a two-dimensional plane and a theoretical curve, the two-dimensional plane is composed of horizontal and vertical coordinates, the theoretical curve is represented on the two-dimensional plane, the horizontal coordinate is an attenuation coefficient conversion engineering quantity GAL, the vertical coordinate is a head wave amplitude CBL, and the theoretical curve is represented on the two-dimensional plane. The head wave amplitudes CBL of different water ring thicknesses and the engineering quantity GAL converted by attenuation coefficients are drawn on a two-dimensional plane together to obtain a theoretical curve, each point on the theoretical curve corresponds to one water ring thickness, and the water ring thicknesses are not distributed on the theoretical curve at equal intervals. According to the method, the well cementation quality is completely displayed through a plane formed by the CBL and the attenuation coefficient related engineering quantity GAL, well cementation quality evaluation is expanded from a one-dimensional CBL to a two-dimensional distribution curve, whether the selected waveform is a casing wave or not and whether the selected waveform can be used for well cementation quality evaluation or not can be judged firstly through the curve on the chart, and then the well cementation quality evaluation is completed. And then the well cementation quality is finely evaluated by determining the thickness of the water ring.

Description

technical field [0001] The invention relates to the field of cementing quality evaluation, in particular to an array acoustic logging cementing quality evaluation interpretation plate based on cased well response. Background technique [0002] Cased hole acoustic cementing quality detection has been using the first wave amplitude CBL with a source distance of 3 feet. In practical application, the cementing quality is generally considered to be good for the well section with small first wave amplitude. However, in the process of oilfield development, cross grooves often occur. That is to say, the CBL is small, and sometimes there will be cross grooves. In the exploration well, there is a situation that does not match the interpretation of the oil and gas logging and logging data. In the development well, the liquid volume increases, the oil is very little, and the water cut is high. Fine evaluation of cementing quality is required. Contents of the invention [0003] The ...

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Application Information

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IPC IPC(8): E21B47/005
CPCE21B47/005
Inventor 沈建国沈永进
Owner TIANJIN UNIV
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