CAJ | 학술논문

在石油和天然气行业中,油管、套管是油气井生产中重要的设施,准确地预测油管、套管抗挤强度能够防止或减少油管、套管失效事故的发生.针对API 5C3计算精度偏低、对抗挤强度影响因素考虑不全面等问题,API/ISO工作组修订了现行API 5C3标准,给出了含制造缺陷(椭圆度、壁厚不均度、残余应力、制造微裂纹等)的抗挤新模型,从而大大提高了套管强度计算的科学性.研究中发现,ISO抗挤新模型并不适合所有尺寸套管强度的计算,当前研究的成果与实际情况存在一定差异,这并非是ISO工作组要研究、修订API 5C3的初衷.因此,建议后续研究者对ISO新模型进行必要的修正或改进,给出更可靠合理的计算模型.这要比单一用API 5C3设计油管、套管强度更合理,既避免了材料的浪费又能保证材料的安全可靠性.
재석유화천연기행업중,유관、투관시유기정생산중중요적설시,준학지예측유관、투관항제강도능구방지혹감소유관、투관실효사고적발생.침대API 5C3계산정도편저、대항제강도영향인소고필불전면등문제,API/ISO공작조수정료현행API 5C3표준,급출료함제조결함(타원도、벽후불균도、잔여응력、제조미렬문등)적항제신모형,종이대대제고료투관강도계산적과학성.연구중발현,ISO항제신모형병불괄합소유척촌투관강도적계산,당전연구적성과여실제정황존재일정차이,저병비시ISO공작조요연구、수정API 5C3적초충.인차,건의후속연구자대ISO신모형진행필요적수정혹개진,급출경가고합리적계산모형.저요비단일용API 5C3설계유관、투관강도경합리,기피면료재료적낭비우능보증재료적안전가고성.
Casings and tubings are widely used as protective conduits during all phases of drilling operations and productions in the oil and gas industry. Therefore, an accurate prediction of the collapse resistance strength is a very important consideration in the casing design to guard against failure accidents. The influence of manufacturing technology and imperfections on casing collapse strength have not been considered in the API 5C3 standard, while the collapse strength of current casings cannot be predicted accurately by the API 5C3 standard due to its low calculation accuracy. In such cases, the joint API/ISO Collapse Sub-Team has proposed the current API 5C3 standard and presented the new collapse strength model with manufacturing imperfections, such as ovality, eccentricity, residual stress, etc., which upgrades the casing strength calculation accuracy and benefits much more for casing strength design. The study on the ISO collapse resistance new model has found that it cannot be used to calculate the collapse resistance strength of pipes with all sizes, and the current study results are greatly different from actual practices, which is not the ultimate goal for the ISO group to propose the API 5C3 standard. So, it is necessary that successive researchers should correct or develop a new ISO collapse resistance model, and present much more reliable and reasonable calculation model. This would benefit much more for in tubing and casing strength design than just using the API 5C3 standard, because it can not only avoid the material loss but also guarantee the safety and reliability of tubing and casing material; moreover, it can provide important reference for the engineers to optimize the strength design and improve the quality in the manufacture of tubings and casings.