Development and Test of Insert Sealing Tool for Offshore Thermal Recovery of Heavy Oil
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 techni-cal analysis,an insert sealing tool for offshore thermal recovery of heavy oil was developed,which uses endother-mic 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 selec-tion 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 2.1×107 Pa pressure difference,main-tain 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 develop-ment of offshore oilfields.
offshore oilfieldthermal recovery of heavy oilinsert sealuniform steam injectionheat con-duction oilthermal expansionhigh temperature
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