An Interference Fitting Algorithm of the Oil Well Structural Stresses Calculation Based on the Concrete Solidification Process

Abstract:

The oil well structure is comprised of stratum, concrete sheath and the steel casing. In petroleum engineering, the liquid concrete is usually poured into the annular gap between the well bore and the steel casing to form a concrete sheath. During the solidification process of the concrete, its volume and mechanical parameters may vary with time and the chemical solidification stresses will therefore be generated. At the same time, the concrete sheath is under the loading of the ground stresses and the hydraulic pressure of the drilling fluid in the casing. Nowadays, most of the researchers calculate the stresses distribution of the oil well concrete sheath based on the external loading only and the solidification process is ignored. In this work, an interference fitting algorithm in consideration of the concrete solidification process is proposed and the external loads such as ground stresses and drilling fluid hydraulic pressure in the steel casing are also considered. The calculated results show that the stresses of the concrete sheath are mainly dependent upon the hydraulic pressure of the liquid concrete and the chemical solidification stresses, rather than the external loads. In addition, an experimental facility used to simulate the oil well structure under the ground stresses is designed in this work, and the results of the experiment verified the conclusion mentioned above.

• Periodical: Advanced Materials Research (Volumes 671-674)
• Pages: 1583-1587
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.671-674.1583
• Online since: March 2013
• Authors: Zhi Fu Yang, Qing Yuan Meng, Kang You Zhong
• Keywords: Concrete Solidification, Ground Stresses, Interference Fitting Algorithm, Stresses Calculation

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DOI: 10.2118/110040-pa