Method for predicting surface washout topography of petroleum drilling tool

A drilling tool and oil drilling technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the operating range has not been raised

Inactive Publication Date: 2012-01-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] The invention provides a method for predicting the surface erosion morphology of petroleum drilling tools, aiming at solving the force near the erosion part of the drilling tool by using the finite element method combined with the material erosion experiment in the existing drilling tool erosion research. However, the description of

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  • Method for predicting surface washout topography of petroleum drilling tool
  • Method for predicting surface washout topography of petroleum drilling tool
  • Method for predicting surface washout topography of petroleum drilling tool

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Embodiment 1

[0050] Example 1: When the fluid medium is drilling fluid, its state is: temperature 30°C, pressure: 10.5MPa, density: 1150kg / m 3 , Viscosity: 0.02Pa·s. The particle size of the solid phase particles in the fluid medium is 0.4mm, and the velocity of the fluid medium flowing through the surface of the drilling tool is 10m / s. When the fluid medium that satisfies the above conditions carries solid phase particles through Image 6 When the inside of the drilling tool is shown, there will be obvious erosion at the connection between the horizontal pipe and the bypass pipe. Image 6 The magnification of the erosion site after the flow has been carried out for 300 hours is shown in the figure, and it can be seen that material erosion has occurred near the connection between the bypass pipe and the horizontal pipe.

[0051] The present invention analyzes and studies the process of the erosion of the surface of the drilling tool by the fluid medium containing solid phase particles,

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Abstract

The invention belongs to the field of petroleum engineering, and provides a method for predicting the surface washout topography of a petroleum drilling tool. The method comprises the following steps: carrying out three-dimensional numerical modeling for the multiphase flow containing solid-phase particles flowing through the surface of the drilling tool; selecting a proper discrete format and a turbulence model to solve the numerical value of the multiphase flow containing solid-phase particles flowing through the surface of the drilling tool to obtain the washout rate of the solid-phase particles against the surface of the drilling tool; according to the obtained washout rate, regulating a computing grid for the surface of the drilling tool; and solving the numerical value of the new grid to obtain a new washout topography until the final computing time is up. In the invention, through analysis and research on the washout process of the fluid medium containing solid-phase particles against the surface of the drilling tool, the range of the working conditions required for generating washout against the surface of the drilling tool is defined, an effective path for obtaining the washout topography and the washout rate against the surface of the drilling tool with a numerical number simulation method is provided, and a prediction method is provide for the washout problems of drilling tool.

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Claims

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Application Information

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Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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