我国CO2驱油注采工艺技术现状及下步研究方向

Present situation and further research direction of CO2 flooding injection-production technology and in China

基于CO2驱注采井完井管柱技术难点,系统阐述了国内CO2驱注采井完井管柱的研究历程和发展现状,总结出CO2驱注采井完井管柱的技术关键是注入井完井管柱的密封性能和采油井完井管柱的防腐防气性能。国内油田CO2驱先导试验表明,封隔器的不断优化、油管的气密性检测等技术有助于提高注入井的密封性;CO2缓蚀剂配方和加注工艺、气举控套、井下油气分离等工艺有助于提高采油井的泵效。同时,针对矿场注采井面临的技术难题,指出了CO2驱注采工艺的下步研究方向。

In view of the technical difficulties of CO2 flooding completion string, the research process and development situation of completion string of CO2 flooding injection-production well were systematically expounded. It was concluded that the sealing perfor. mance of the completion string of injection well and anti corrosion and gas proof performance of production well were the key tech. nologies for the normal production of CO2 flooding injection-production well. The pilot test of CO2 flooding in domestic oilfield showed that the continuous optimization of packer and the gas tightness detection of tubing contributed to improve sealing of injec. tion wells, and the technologies like CO2 corrosion inhibitor formulation, injection strengthening, tube controlling by gas lifting, downhole oil and gas separation were helpful to improve the pumping efficiency of the production wells. Meanwhile, in view of the technical problems faced by the injection and production wells on site, the further research direction of production by CO2 flooding injection and production technology was pointed out.