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- Title
井口无支撑段连续油管极限拉压载荷分析.
- Authors
杨 明; 刘巨保; 王田玉; 丁宇奇; 岳欠杯; 杨 宝
- Abstract
The unsupported section of the wellhead coiled tubing has the largest differential pressure and no wellbore constraints, which is easy to bend or even break. According to the Lame formula, the theoretical calculation formula of the ultimate tension and compression load of coiled tubing in unsupported section under the action of axial load and internal pressure was derived. According to ASME code, the numerical simulation method of ultimate tensile and compressive loads was given, and verified with theoretical calculation formulas and experimental data. The ultimate tensile and compressive load curves of fault-free coiled tubing with different steel grades and wall thickness under internal pressure were calculated by theoretical formula. The ultimate tensile and compressive load curves with ellipticity and wall thinning defects under internal pressure were simulated by numerical method. The results show that the ultimate tensile and compressive load of coiled tubing increases with the increase of steel grade and wall thickness. With the increase of internal pressure, the ultimate tensile load of coiled tubing first increases and then decreases, with an extreme point. The ultimate pressure load decreases with the internal pressure in a parabolic form. At higher internal pressures, the ovality and wall thinning defects significantly reduce the ultimate tensile load of coiled tubing. The results provide a basis for pressure and load evaluation of unsupported coiled tubing in wellhead during perforating and fracturing operations.
- Publication
Journal of Northeast Petroleum University, 2023, Vol 47, Issue 1, p116
- ISSN
2095-4107
- Publication type
Article
- DOI
10.3969/j.issn.2095-4107.2023.01.010