Method and device for determining horizontal crack widths

A technology of horizontal fracture and fracture width, applied in the field of oil and gas exploration of fractured reservoirs, can solve the problems of difficulty in accurately calculating the width of horizontal fractures, small amplitude of reflected waves, interference, etc., so as to correct the interference of formation lithology and other factors, reduce The effect of multiple solutions and improved accuracy

Active Publication Date: 2018-01-16
PETROCHINA CO LTD
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Problems solved by technology

[0005] For the method proposed by Tang Xiaoming et al. using Stoneley wave reflections to calculate the fracture width, when the fracture width is small, the reflected wave amplitude will be very small, and the accuracy of the calculated fracture width at this time is low; When there are cracks, the Stoneley wave reflections formed by different cracks will interfere with each other, thus affecting the accuracy of the calculation results
However, fo

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  • Method and device for determining horizontal crack widths
  • Method and device for determining horizontal crack widths

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Embodiment Construction

[0069] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0070] refer to figure 1 As shown, the method for determining the width of a horizontal crack in the embodiment of the present application may include:

[0071] S101. Establish a numerical model of the well to be treated, and simulate the acoustic logging waveform of the numerical model under each horizontal fracture.

[0072] In an emb...

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Abstract

The embodiment of the invention provides a method and device for determining horizontal crack widths. The method includes the steps that a numerical model of a to-be-treated well is built, and acoustic logging waveforms of the numerical model under all horizontal cracks are simulated; according to the acoustic logging waveforms under all horizontal cracks, the first stoneley wave amplitude variation amounts of the horizontal cracks are determined; according to the first stoneley wave amplitude variation amounts of all horizontal cracks, a relationship curve between the crack widths and the stoneley wave amplitude variation amounts is determined; according to the acoustic logging waveforms of the to-be-treated well, second stoneley wave amplitude variation amounts of all horizontal cracks in the to-be-treated well are determined; according to the relationship curve and the second stoneley wave amplitude variation amounts of all horizontal cracks in the to-be-treated well, the width of each horizontal crack in the to-be-treated well is determined. By means of the embodiment, the calculation accuracy of the horizontal crack widths can be improved.

Description

technical field [0001] The present application relates to the technical field of oil and gas exploration in fractured reservoirs, in particular to a method and device for determining the width of horizontal fractures. Background technique [0002] Fractured reservoir is an important direction of oil and gas exploration at present. In fractured reservoirs, fracture width, fracture length and fracture density are important reservoir evaluation parameters, especially for the quantitative calculation of fracture width, because the accuracy of the calculation results will directly affect the calculation of other fracture parameters . [0003] The current methods for calculating fracture width mainly include acoustic logging method and resistivity imaging method. Acoustic logging refers to a technology that arranges sound sources in a liquid-filled wellbore several kilometers deep and generates multiple mode waves in the wellbore, and then uses the acoustic information of variou...

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Application Information

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IPC IPC(8): E21B49/00
Inventor 刘鹏李宁武宏亮王克文冯周冯庆付李雨生
Owner PETROCHINA CO LTD
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