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Casing string centering in directional wells

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Category: Mining

Last Updated on 30 October 2015

Published on 30 October 2015

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Authors:

Ya.S. Kotskulych, Dr. Sci. (Tech.), Professor, Ivano-Frankivsk National Technical University of Oil and Gas, Professor of the Department of Oil and Gas Well Drilling Engineering, Ivano-Frankivsk, Ukraine.

M.V. Seniushkovych, Cand. Sci. (Tech.), Associate Professor, Ivano-Frankivsk National Technical University of Oil and Gas, Senior Lecturer of the Department of Oil and Gas Well Drilling Engineering, Ivano-Frankivsk, Ukraine.

O.B. Martsynkiv, Cand. Sci. (Tech.), Associate Professor, Ivano-Frankivsk National Technical University of Oil and Gas, Senior Lecturer of the Department of Oil and Gas Well Drilling Engineering, Ivano-Frankivsk, Ukraine.

I.I. Vytvytskyi, Ivano-Frankivsk National Technical University of Oil and Gas, Assistant Lecturer of the Department of Oil and Gas Well Drilling Engineering, Ivano-Frankivsk, Ukraine.

Abstract:

Purpose. Improvement of preparation technology of the wellbore of directional wells for providing proper cementing of casing strings and forming of reliable casing.

Methodology. A model of the well with casing string equipped with centralizers was considered. The deflection of casing string that causes the formation of a gap between the string and the well wall was simulated. The following factors were taken into account: rigidity of casing pipes, deflection size, and distensible axial force applied to the casing string below the first centralizer, well axe zenith angle, density of fluids inside the casing string and in the annular space. Each of these factors determines the length of half-wave of deflection separately and taken together, and this should be described by analytical dependencies.

Findings. The appropriateness of making decisions about the size of the gap between the casing string and well wall, the length of its interval between the cross sections of centralizers’ placement for the given geological and technical conditions and casing quality requirements was reasoned.

The algorithm of determining the length of casing string half-wave of deflection depending on the factors considered has been developed. The importance of each factor was determined based on the results of the multifactor analysis.

The necessity of taking into account the rigidity of pipes of the casing string when determining the length of the half-wave, especially for small values of zenith angle, was reasoned.

The magnitude of the force influencing single centralizer installed on the casing string in the directional well has been determined.

Originality. The dependencies of the length of half-wave of deflection of a casing string on the factors influencing the reliability of casing of directional wells have been determined.

Practical value. The improved methods may be used for optimization of quantity of centering devices on the casing string and estimation of their working capacity, which will prevent problems that can occur when running casing string and give the opportunity to prepare the wellbore for cementing operations.

References:

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