【作者】 南发学；

【导师】 陈次昌；

【作者基本信息】 西南石油大学 ， 油气储运工程， 2011， 博士

【摘要】 随着国家对天然气资源需求的快速增加,高压、含H2S、CO2天然气的腐蚀与安全防护技术已成为我国塔里木、鄂尔多斯、准噶尔等盆地主力气田安全、高效开发的关键。由于非金属钢管道具有良好的耐腐蚀性,在低中压非金属集油管道、高压注水管道中已得到了不断应用,但在高压天然气,特别是含硫天然气中尚无工业性应用。论文通过大量的资料和现场调研,首先在定性分析玻璃钢管道的基本性能参数及其变化规律的基础上,根据集输管道的主要管径大小和承压等级,基于多通道数采系统、激光测振仪、箔式应变计及SI3535D静态应变仪开展了无内衬环氧玻璃钢管、玻璃钢多层复合防腐管和玻璃钢内衬不锈钢管三种管材的刚度、密封性能、水压爆破试验,建立了试验过程中加载力和加载部位位移、应变与压力间满足的线性变化关系式。其次,论文研究分析了内、外螺纹连接部位的受力状况、轴向变形与啮合程度,建立了内、外螺纹连接部位及螺纹牙变形满足的变形协调方程、强度校核条件、接触压力计算公式和弹塑性接触有限元分析模型,实例计算结果与试验一致。在合理假设非金属复合管道由连续的层合结构组成、基体纤维分布均匀、增强体和基体间无相对滑移的前提下,根据几何关系知缠绕螺距l,采用柱坐标建立力平衡方程,建立了由增强纤维强度极限σbg及基体计算强度σbg表示的非金属玻璃钢管极限承载压力Pb理论计算公式,按照材料非线性Von Mises屈服准则、理想的弹塑性应力-应变关系和双线性随动强化准则建立了非金属管道极限承载有限元分析模型,通过模型应用确定了非金属玻璃管道的最佳缠绕角度角度55°,得到三种非金属管道极限承载能力与温度间的非线性计算公式Pb=-0.0017T2+ 0.1057T+40.67、Pb=-0.0039T2+0.1652T+38.077、Pb=-0.0039T2+0.1652T+38.077。基于玻璃钢管道主要失效模式、高斯烟团模型,通过坐标变换,以临界泄流为基础,建立了便于现场应用的高含硫天然气泄漏扩散的高后果区半径、扩散时间的简化计算公式并提出了相应的安全防护措施。最后,论文基于塔里木气田介质工况和环境条件,选取1km长管道为分析对象进行了应用分析,确定了管材、管径、埋深、压力等关键参数,从而为设计和生产管理部门进行非金属玻璃钢管材的选择和应用提供直接依据。更多还原

【Abstract】 Along with the country’s rapid increase in demand for natural gas, high pressure, including H2S, CO2 gas corrosion and security protection technology has become China’s Tarim, Ordos, Junggar basins main gas field safety, efficient development of the key. As the non-metallic pipe has good corrosion resistance, non-metal set in the low and medium pressure oil pipeline, high pressure injection water pipeline has been constantly used, while in the high-pressure natural gas, particularly sour gas in the industrial application yet.By large amounts of data and field research in the paper, qualitative analysis of the first glass pipe in the basic performance parameters and change the law based on the major diameter gathering pipeline size and pressure rating, based on multi-channel data acquisition systems, laser measurement vibration meter, foil strain gauges and strain gauge SI3535D conducted static-free epoxy glass lined steel, glass, steel and glass multi-layer composite pipe, steel pipe lined with stainless steel three kinds of stiffness, sealing performance, burst test, the test procedure established loading capacity and loading position displacement, strain and pressure to meet the linear inter-relationship. Second, paper analyzes the internal and external screw connection portions stress conditions, the degree of axial deformation and engagement is established, the external thread and the thread tooth deformation of joints to meet the deformation equation, strength checking condition, contact pressure calculation formula and elastic-plastic contact finite element analysis model, examples of calculated and experimental line. Reasonable assumption in non-metallic composite pipe by the continuous laminated structure composed of fibers based distribution, reinforcement, and no relative slip between the matrix under the premise of knowledge according to the geometric relationship between winding pitch, using cylindrical coordinates the establishment of force balance equations of by the ultimate strength of reinforced fiber and matrix strength of said non-metallic glass calculated ultimate bearing pressure pipe calculation formula, in accordance with the material nonlinear Von Mises yield criterion, the ideal elastic-plastic stress - strain relations and bilinear kinematic hardening guidelines for the establishment of a non-metallic pipe breaking load finite element analysis model, by model application to determine the best non-metallic glass pipe winding angle of angle 55o, get three non-metallic pipelines carrying capacity and temperature limits between the non-linear formula Pb=-0.0017T2+0.1057T+40.67, Pb=-0.0039T2+0.1652 T+38.077, Pb=-0.0039T2+0.1652 T+38.077. Based on the main failure mode of glass pipes, gaussian puff model, and coordinate transformation, to the critical discharge based site set up to facilitate the application of high-sulfur natural gas leak and diffusion of high consequence area radius, diffusion time of the simplified formula and put forward the corresponding security measures. Finally, the paper medium based on the Tarim gas field, working conditions and environmental conditions, select the 1km long pipeline has been applied for the analysis of objects analyzed to determine the pipe diameter, depth, pressure and other key parameters for the design and production management for non-metallic FRP pipe to provide a direct basis for the selection and application.更多还原