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

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 ...

AI Technical Summary

Problems solved by technology

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

Images