Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Development of Design Method for Casing and Tubing Strings under Complex Alternating Loads

Version 1 : Received: 2 May 2023 / Approved: 2 May 2023 / Online: 2 May 2023 (07:22:27 CEST)

How to cite: Wang, J.; Li, D.; Du, X.; Li, H.; Yang, S. Development of Design Method for Casing and Tubing Strings under Complex Alternating Loads. Preprints 2023, 2023050065. https://doi.org/10.20944/preprints202305.0065.v1 Wang, J.; Li, D.; Du, X.; Li, H.; Yang, S. Development of Design Method for Casing and Tubing Strings under Complex Alternating Loads. Preprints 2023, 2023050065. https://doi.org/10.20944/preprints202305.0065.v1

Abstract

In the increasingly complex environment of downhole working conditions such as frequent opening and closing of oil and gas wells, acidification/multi-stage fracturing, steam huff and puff, and strong injection and production, the traditional casing string design method standards based on strength design have gradually highlighted their limitations. It is necessary to formulate string design method standards that consider the full life cycle of wells such as drilling and completion, fracturing, and production operations. Starting from the analysis of the advantages and disadvantages of traditional casing string design methods, this paper presents the characteristics of the strain design methods and seal design methods that have been formulated for the life cycle of the string. The strain design method breaks through the traditional design concept and allows the design concept of controllable deformation of the pipe string. The sealing design method is currently the only standard method for the design of tubing strings. At the same time, it further proposes to consider the trend of pipe strength deterioration and establish a time dimension-based life cycle pipe string design method standard, which effectively solves the safety problem of pipe string design in production and operation.

Keywords

oil and gas well; tubing; casing; pipe string design

Subject

Engineering, Safety, Risk, Reliability and Quality

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