中国南海某气田海管投产的虚拟调试分析及应用

Virtual Debugging Analysis and Application of a Subsea Pipe put into Production in a Gas Field in the South China Sea

深水油气田的海管系统投用是气田投产调试中的关键环节,需要对操作方案的合理性和流动保障风险进行评估。某气田水下系统启动前,使用了一体化生产管理系统的虚拟调试功能,模拟计算了水下系统启动过程中的置换、吹扫等开井操作准备流程。通过机理模型的动态模拟,分析评估了操作过程中水下系统的动态变化特性。模拟分析了在施工过程进水的工况下,水下系统各管段的水合物生成风险。施工过程进水的工况下,启井过程中跨接管段有水合物生成风险。结果显示,软管铺设过程中进入约12 m3含水管段后,水合物生成位置集中在井口软管内。通过预先注入2~3倍体积抑制剂后,可以抑制天然气窜进从而生成水合物。

The process of sub-sea pipe system put into production in deepwater oil and gas field is a key link in the commissioning of gas field. It is necessary to evaluate the rationality of the operation plan and the risk of flow assurance. Before the subsea system of a gas field is started,the virtual debugging function of the integrated production management system is used to simulate and calculate the well opening preparation processes such as displacement and purging during the subsea system start-up.Through the dynamic simulation of the mechanism model,the dynamic change characteristics of the subsea system during the operation are analyzed and evaluated. The risk of hydrate formation in each pipe section of the subsea system is simulated and analyzed under the condition of water inlet during construction. There is hydrate formation risk in the cross pipe section in the well opening process under the condition of water inlet during the construction process. The results show that the hydrate formation position is concentrated in the wellhead hose after entering the 12 m3water-bearing pipe section during the hose laying process. The formation of hydrate caused by the entry of natural gas can be inhibited by injecting 2~3 times the volume of inhibitor in advance.