【作者】 李平；

【导师】 颜廷俊；

【作者基本信息】 北京化工大学 ， 动力工程及工程热物理， 2020， 硕士

【摘要】 近年来油气田面临着高含H2S、CO2、O2、残酸等高矿化、酸性油气水介质等腐蚀问题,给碳钢和低合金钢等钢管的应用带来了很大的风险。粘接性玻璃纤维热塑性复合材料管作为一种典型的非金属复合材料管材,具有耐腐蚀、易弯曲、重量轻、便于运输和施工等一系列优点,而成为油田地面集输管网防腐的重要解决方案之一,是油田用管的主要发展方向。而接头作为管道系统终端连接装置,其结构及密封性能对复合材料管的承压性能起着决定性作用。目前大多数国内外学者均集中于对海洋油气输送用复合材料管及其接头的研究,而在我国石油开采中陆地石油开采占有很大比重,海上石油开采量相对较小。因此,开展对陆地油气田输送用管及其接头的研究具有一定的工程实践意义。本文主要对陆地油气输送用粘接性玻璃纤维热塑性复合材料管及其接头的结构进行设计,具体研究内容包括:(1)通过分析内衬层常用材料的特点,并根据管道使用工况最终选用聚偏氟乙烯(PVDF)与高密度聚乙烯(HDPE)作为内衬层材料。并通过相关实验获得PVDF与HDPE材料力学性能参数,其中PVDF的屈服强度为50 MPa,弹性模量为2000 MPa,HDPE的屈服强度为20 MPa,弹性模量为600 MPa;(2)根据粘接性玻璃纤维热塑性复合材料管制造工艺及分析,得到影响内衬层厚度的主要因素为玻璃纤维带缠绕方式、缠绕层数以及加热温度。通过有限元分析得出直径为Φ65 mm的粘接性玻璃纤维热塑性复合材料管在常温下内衬层的最小厚度为3.7 mm,在加热温度下内衬层的最小厚度为4 mm;(3)根据埋地用粘接性玻璃纤维热塑性复合材料管技术设计指标并参考相关规范,对复合材料管在设计载荷下的增强层结构进行设计,使所设计的管道能够满足强度设计要求。通过校核最终得出对于直径为Φ65mm,设计压力为15 MPa,缠绕角度为±55°的复合材料管,其增强层最少缠绕层数为8层;(4)通过有限元分析软件对所设计的粘接性玻璃纤维增强复合材料管所能承受的最大拉伸载荷以及最小弯曲半径进行校核。经校核对于直径为Φ65 mm,缠绕角度为±55°,缠绕层数为8层的粘接性玻璃纤维热塑性复合材料管所能承受的最大轴向拉伸载荷为80 KN,在无内压和有内压作用下的最小弯曲半径分别为1.78 m和2.8 m;(5)确定粘接性玻璃纤维热塑性复合材料管专用接头结构及密封型式,主要以O型密封为主挤压密封为辅。通过Abaqus有限元分析软件对所设计的接头结构强度及密封性能进行校核,经校核该接头结构能够满足设计载荷及密封要求。更多还原

【Abstract】 In recent years,oil and gas fields are facing corrosion problems such as high H2S,CO2,O2,residual acid and other highly mineralized and acidic oil,gas and water media,which bring great risks to the application of steel pipes such as carbon steel and low alloy steel.Adhesive glass fiber thermoplastic composite pipe,as a typical nonmetallic composite pipe,has a series of advantages such as corrosion resistance,easy bending,light weight,convenient transportation and construction,etc.It has become one of the important solutions for anticorrosion of oil field surface gathering and transportation pipe network,and is the main development direction of oil field pipe.As the terminal connection device of the pipeline system,the structure and sealing performance of the joint play a decisive role in the pressure bearing performance of the composite pipe.At present,most scholars at home and abroad focus on the research of composite pipes and their joints for offshore oil and gas transportation,while onshore oil exploitation accounts for a large proportion in China’s oil exploitation and offshore oil exploitation is relatively small.Therefore,it is of certain engineering practical significance to carry out the research on pipelines and their joints for onshore oil and gas fields.The structure of adhesive glass fiber thermoplastic composite pipe and its joints for land oil and gas transportation are designed in this paper.The specific research contents include:(1)By analyzing the characteristics of common lining materials,polyvinylidene fluoride(PVDF)and high density polyethylene(HDPE)are finally selected as lining materials according to the service conditions of pipelines.The mechanical property parameters of PVDF and HDPE were obtained through relevant experiments,in which the yield strength of PVDF was 50MPa,the elastic modulus was 2000 MPa,the yield strength of HDPE was 20MPa,and the elastic modulus was 600 MPa;.(2)According to the manufacturing process and analysis of adhesive glass fiber thermoplastic composite pipe,it is found that the main factors affecting the thickness of lining layer are the winding mode of glass fiber tape,the number of winding layers and the heating temperature.Through finite element analysis,it is found that the minimum thickness of the inner lining of the adhesive glass fiber thermoplastic composite pipe with a diameter ofΦ65mm is 3.7 mm at normal temperature and 4 mm at heating temperature.(3)According to the technical design indexes of the buried adhesive glass fiber thermoplastic composite pipe and referring to relevant specifications,the reinforced layer structure of the composite pipe under design load is designed.The designed pipeline can meet the strength design requirements.Through checking,it is finally concluded that for the composite pipe with a diameter ofΦ65 mm,a design pressure of 15 MPa and a winding angle of ±55°,the minimum number of winding layers for the reinforced layer is 8.(4)The maximum tensile load and the minimum bending radius of the designed bonded glass fiber reinforced composite pipe are checked by finite element analysis software.After checking,the maximum axial tensile load that adhesive glass fiber thermoplastic composite pipe with diameter of Φ65 mm,winding angle of ± 55°,and winding layer number of 8 can bear is 80 KN,and the minimum bending radius under no internal pressure and internal pressure are 1.78 m and 2.8 m respectively.(5)Determine the special joint structure and seal type of adhesive glass fiber thermoplastic composite pipe,mainly with O-type seal as the main and extrusion seal as the auxiliary.Through Abaqus finite element analysis software,the strength and sealing performance of the designed joint structure are checked.After checking,the joint structure can meet the design load and sealing requirements.更多还原