油套管特殊螺纹接头密封性试验评价方法探析  

Discussion on Evaluation Methods for Sealing Test of Tubing and Casing Premium Connection

作　　者：申昭熙 李宏杰 赵刚 王红梅[3] 刘建东[4] 闫炎 王建军 SHEN Zhaoxi;LI Hongjie;ZHAO Gang;WANG Hongmei;LIU Jiandong;YAN Yan;WANG Jianjun(State Key Laboratory of Oil and Gas Equipment,CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;Tianjin Gas Storage Branch,PetroChina Dagang Oilfield Company,Tianjin 300280,China;The 1 st Gas Plant of PetroChina Changqing Oilfield Company,Jingbian,Shaanxi 718500,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China)

机构地区：[1]中国石油集团工程材料研究院有限公司,油气钻采输送装备全国重点实验室,陕西西安710077 [2]中国石油大港油田天津储气库分公司,天津300280 [3]中国石油长庆油田分公司第一采气厂,陕西靖边718500 [4]中国石油勘探开发研究院,北京100083

出　　处：《石油管材与仪器》2024年第5期24-27,32,共5页Petroleum Tubular Goods & Instruments

摘　　要：对储气库注采井等高压气井油管柱泄漏数据统计分析发现,现场特殊螺纹接头泄漏的比例远大于实验室。通过了API RP 5C5—2017 CAL IV实验室内系统评价和下井前气密封试验的油管特殊螺纹接头,在井下服役一段时间后仍然发生泄漏。为此,对内外螺纹上扣啮合后存在的间隙进行简化,建立有限元数值模拟模型,分析了充满螺纹脂的螺纹接头的密封压力;基于气体状态方程,分析了泄漏气体冲破螺纹脂密封压力逸出接箍的时间。分析结果表明,依据API RP 5C5—2017标准推荐做法,内外螺纹均涂抹螺纹脂上扣,即使试验过程中特殊螺纹接头金属密封发生泄漏,泄漏的气体也可能因被封闭在接箍内的孔隙中而无法被检测到,从而导致错误的评价结果。Statistical analysis of leakage data from high-pressure gas wells such as injection and production wells in gas storage facilities revealed that the proportion of leakage from premium connections on site was much higher than that in the laboratory.The premium connections of tubing and casing that passed the test evaluation according to API RP 5C5—2017 CAL IV and the gas seal test before running still experienced leakage after serving for a period of time.This article simplifies the gap between the pin and box after make-up,establishes a finite element simulation model,and analyzes the sealing pressure of thread filled with compound.Based on the gas state equation,the time for the leaked gas to break through the pressure of the compound seal and escape from the coupling was analyzed.The analysis results indicate that when both pin and box threads are coated with the compound for make-up according to the recommended practice of API RP 5C5—2017,the leaked gas may be trapped in the pores inside the coupling and cannot be detected even if the metal seal of the premium connection leaks during the test,which leads to incorrect evaluation results.

关 键 词：特殊螺纹接头 密封压力 试验评价 黏度 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]