基于API圆螺纹的气密封螺纹开发及评价

发布时间：2018-09-14 18:11

【摘要】：如果能在相对成本最低的API圆螺纹的基础上开发出一种低成本气密封螺纹替代目前的特殊螺纹接头,将带来巨大的经济效益。为此,按API Spec 5B标准,基于圆螺纹设计并加工了一种气密封螺纹结构,接箍中间增加了弹性密封圈,依靠弹性密封圈与套管螺纹的过盈配合实现密封。采用MSC.Marc/Mentat有限元分析软件对其进行了极限承载能力评价,然后按照ISO 13679标准对?73.02×5.51 mm J55钢级气密封螺纹实物进行了ISO 13679 B系试验、C系试验及弯曲条件下气体内压加拉伸试验。结果表明:(1)该气密封螺纹结构气密封性能良好,封堵管端最终内压循环与热循环试验的结果符合ISO 13679标准的要求;(2)该气密封螺纹结构抗内压强度、抗拉伸强度和抗外压挤毁强度均大幅高于GB/T 20657标准的要求。结论认为,该气密封螺纹结构可以在鄂尔多斯盆地低压气井开发中使用,具有大幅度节约套管成本的潜力,也可供新型气密封螺纹结构的设计借鉴。
[Abstract]:If we can develop a kind of low cost gas seal thread to replace the special thread joint based on the API round thread which has the lowest relative cost, it will bring great economic benefits. According to API Spec 5B standard, a kind of gas seal thread structure is designed and machined based on round thread. The elastic seal ring is added in the middle of the coupling, and the seal is realized by the interference fit between the elastic seal ring and the casing thread. The ultimate load-bearing capacity was evaluated by MSC.Marc/Mentat finite element analysis software, and then the ISO 13679 B series test and the gas internal pressure and tensile test were carried out on the steel grade gas seal thread of 73.02 脳 5.51 mm J55 according to the ISO 13679 standard. The results show that: (1) the gas sealing performance of the gas seal thread structure is good, the final internal pressure cycle and thermal cycle test results at the end of the sealing pipe meet the requirements of ISO 13679 standard, (2) the internal pressure strength of the gas seal thread structure, The tensile strength and the compressive strength are higher than GB/T 20657 standard. The conclusion is that the gas seal thread structure can be used in the development of low pressure gas wells in Ordos Basin, which has the potential of greatly saving casing cost, and can also be used for reference in the design of new type gas seal thread structure.
【作者单位】：陕西延长石油(集团)有限责任公司研究院;陕西省陆相页岩气成藏与开发重点实验室(筹);宝山钢铁股份有限公司;
【基金】：国家科技支撑计划“陕北煤化工CO_2捕集、埋存与提高采收率技术示范”(编号:2012BAC26B00) 陕西省科技统筹创新工程计划“陕北致密砂岩油藏CO_2提高采收率关键技术研究及先导试验”(编号:2014KTZB03)
【分类号】：TE931.2

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