含H2S/CO2气井套管环境敏感断裂力学行为判据研究

Basically completed all the research content of the Young Science Fund Project(study on the mechanism of blowout induced by supercritical fluid and related well control technology, Grant No.50904050), the applicant has published 16 academic papers as the first author, which 6 SCI cited (including accepted ones) and 6 EI cited; the writer has attented foreign and domestic academic conference 6 times, gained one invention patent and one practical new type patent, and authorized 6 software copyrights. What’s more, help guide and tutor doctor and graduate studes totally 3 persons. The content of the project intended to apply: based on the experimental result, as well as impurities and the other measureable parameters(e.g. the geometrical property of third phase of intergranular sediment), this project is supposed to set the criterion of casing environment-sensitive fracture mechanics behavior for gas wells containing H2S/CO2 by analyzing from the mesomechanics, motify the ISO/TR 10400 (2007 Edition) tubing strength model, as well as conduct a material corrosion evaluation experiment under a paticular stress level for the first time and discuss the mechanical properties of material before and after experienced HTHP high corrosive environment. It will provide an easy approach to guide the applicability design and safety evaluation of tubing for gas wells with high sulfur content. Also, a scientific, rigorous and reliable reference of controlling, diagnosing and checking the quality of materials would be available. Apart from that, it can also offer a direction and basis for the improvement of the process of steel-making, steel-rolling and heat treatment.

主持的青年科学基金项目（超临界流体诱发井喷机理与井控技术研究，批准号：50904050）已经基本完成全部研究内容，以申请人为第一作者发表学术论文16篇，其中SCI 6篇（含已录用）、EI 6篇；参加国内外学术会议6次；申报发明专利1项、实用新型1项；授权软件著作权6项；协助指导博士、培养硕士研究生3人。拟申请项目内容：基于“细观力学”理论，通过室内实验，以夹杂物及其它第三相晶间沉积的几何特性等可检测参数为指标，研究并提出含H2S/CO2气井油套管环境敏感断裂力学行为判据准则；实验测试特定应力水平条件下材料的腐蚀规律，并修正ISO/TR 10400（2007年版）油套管强度计算模型，探讨经历井筒高温高压含H2S/CO2环境前后材料力学性能的变化及其对强度的影响。研究成果不仅对油套管适用性设计和安全评价、材料优选具有重要指导意义，同时也对钢厂炼钢、轧钢、热处理等具有重要的借鉴和参考作用。

改进NACE TM0177-2005标准中A实验方法，采用Hastelloy C276分别设计圆型夹具、板型夹具两种恒载荷应力腐蚀实验装置，开展了恒载荷应力腐蚀实验，研究了恒载荷应力腐蚀实验数据处理方法。开展了经历井筒高温高压含H2S/CO2 环境后材料的力学性能测试，得出油井管试样在不同拉应力、腐蚀介质以及不同H2S、CO2分压等腐蚀介质的综合作用下屈服强度、抗拉强度、延伸率、断面收缩率等强度、韧性损伤规律。研究了井筒腐蚀环境中油套管真实强度，并在普光X中开展了现场应用。