海上稠油热采插入密封工具研制与试验

Development and Test of Insert Sealing Tool for Offshore Thermal Recovery of Heavy Oil

为了解决海上稠油热采作业注汽不均匀、油藏局部吸热、开采效率低的问题,通过工艺分析,研制了海上稠油热采插入密封工具。该工具采用导热油吸热膨胀作为坐封动力源,可有效简化工具结构和作业流程。通过对比试验对热膨胀试验油进行了优选,采用专业软件对工具关键部件进行有限元分析,验证了工具结构及选材的合理性,并在室内对工具的性能进行验证。现场测试结果表明:该插入密封工具在经过3个轮次、350和50℃高低温密封测试后,仍可承受2.1×10^(7)Pa压差,在高低温条件下均保持较小的解封力,试验后高温密封组合未发生明显损坏。该工具结构简单,性能可靠,与常规的注汽阀配套使用,可满足海上油田稠油热采分段注汽的要求,具有良好的应用前景。研究成果可为海上油田高效开发提供良好的技术储备。

In order to solve the problems such as uneven steam injection,local heat absorption in reservoir and low recovery efficiency in offshore thermal recovery operation of heavy oil for the moment,by means of technical analysis,an insert sealing tool for offshore thermal recovery of heavy oil was developed,which uses endothermic expansion of heat conduction oil as setting power source to effectively simplify the tool structure and operation process.By means of comparative test,the thermal expansion test oil was optimized;the professional software was used conduct finite element analysis on key parts of the tool;the rationality of the tool structure and material selection was verified;and the performance of the tool was verified indoors.The field test results show that after 3 turns of seal tests at 350℃and 50℃,the insert sealing tool can still withstand 2.1×10^(7)Pa pressure difference,maintain a small unsetting force,and the high-temperature sealing combination does not show apparent damage;the tool has a simple structure,reliable performance,can be used in conjunction with conventional steam injection valves,can meet the requirements of staged steam injection for thermal recovery of heavy oil in offshore oilfields,and has good application prospects.The research results provide a good technical storage for the efficient development of offshore oilfields.