Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2025, Vol. 47 ›› Issue (4): 177-188.DOI: 10.11885/j.issn.1674-5086.2023.12.27.35

• PETROLEUM MACHINERY AND OILFIELD CHEMISTRY • Previous Articles    

Research and Application of Window Opening for High-grade Steel Thick-wall Casing in Ultra-deep Wells

TANG Ming1, WANG Shuangning1,2, HE Shiming1, ZHANG Guangfu1, LIU Xiaosen3   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Exploration Division, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan, 641400, China;
    3. School of Energy Engineering, Longdong University, Qingyang, Gansu, 745000, China
  • Received:2023-12-27 Published:2025-07-25

Abstract: Windowing and sidetracking is one of the important methods to deal with complex accidents underground. Windowing and sidetracking in ultra-deep wells such as not less than 7 000 m well depth with high steel grade (TP155V) and thick wall (15.83 mm) casing not only faces complex underground environment with high temperature and pressure, but also has the difficulty of long operation time and high cost. In order to improve the success rate and operation efficiency of high steel grade thick wall casing windowing in ultra-deep wells, this paper uses ABAQUS software to establish the casing windowing side-drilling simulation model and optimize the windowing milling cone. Ground tests are used to further demonstrate the simulation results, and the selected ones are suitable for the windowing milling cone in ultra-deep wells for field application. The simulation shows that the milling shoulder and the outer circle of the cone top are the main working faces of window opening and window repairing. The conical milling cone has the largest window opening stress, the highest window opening efficiency, and the regular and smooth shape of the window. In the ground test, the conical milling cone can successfully open the window, but the spiral milling cone and the drill type can't open the window successfully. The casing with a depth of 7 473 m, a wall thickness of 15.83 mm and steel grade TP155V was successfully drilled by conical milling cone in Well Shuangtan102, which set three records in China for the deepest drilling depth, the highest steel grade and the thickest wall thickness. The research results of this paper provide a reference for the efficient windowing and sidetracking of ultra-deep Wells, and provide support for the efficient exploration and development of ultra-deep oil and gas resources.

Key words: ultra deep well, high steel grade thick wall casing, windowing side drill, milling cone, simulation

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