Title: Mechanics of the tubing string for supercritical CO₂ fracturing

Authors: Wenguang Duan; Baojiang Sun; Deng Pan; Hui Cai

Addresses: School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China; CNPC Xibu Drilling Engineering Company Limited, Urumqi 830011, Xinjinag, China ' School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China ' CNPC Xibu Drilling Engineering Company Limited, Urumqi 830011, Xinjinag, China ' College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, China

Abstract: Supercritical CO₂ fracturing is one of the most efficient ways for increasing petroleum productivity. Tubing string for the fracturing is necessary and plays an important role in the fracturing process. A mechanical model of the tubing string in the well for fracturing is set up. The forces on the tubing string are analysed. The mechanical formulas are derived. The stresses of the tubing string are calculated and the strength of the tubing string is checked. Running accessibility of the tubing string through the well for fracturing is studied. The equations for calculating critical force on the tubing string for fracturing causing sinusoidal bucking and helical bucking are given. Based on the finite element method, a model is setup. The stress and deformation of the tubing string in the horizontal and deviation well sections are calculated. Results show that under the given conditions, the tubing string is safe and efficient.

Keywords: supercritical CO₂; fracturing; tubing string; running accessibility; mechanics.

DOI: 10.1504/IJCAT.2021.120735

International Journal of Computer Applications in Technology, 2021 Vol.67 No.1, pp.58 - 68

Received: 18 Oct 2020
Accepted: 09 Dec 2020
Published online: 07 Feb 2022 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article