CAJ | 학술논문

针对非均质油藏中水-CO2交替注入中各个段塞所发挥的作用无法确定等问题，在非均质岩心模中设计了水-CO2交替驱油和不同注气方式后水-CO2交替驱油四组对比实验进行研究。结果表明，水-CO2交替、续注气、间歇注采和周期注气提高采收率幅度分别为78%、41.9%、32.2%、42.3%，然后在后三种注气方式基础上进行水-CO2交替驱油，分别再提高采收率9.5%、43.7%和16.6%。在非均质岩心模型中，水-CO2交替驱能够在其他开发方式基础上增大压力梯度、扩大波及体积并提高采收率；CO2段塞是驱替残余原油的主要段塞，水段塞主要起增加 CO2段塞渗流阻力的作用。
침대비균질유장중수-CO2교체주입중각개단새소발휘적작용무법학정등문제，재비균질암심모중설계료수-CO2교체구유화불동주기방식후수-CO2교체구유사조대비실험진행연구。결과표명，수-CO2교체、속주기、간헐주채화주기주기제고채수솔폭도분별위78%、41.9%、32.2%、42.3%，연후재후삼충주기방식기출상진행수-CO2교체구유，분별재제고채수솔9.5%、43.7%화16.6%。재비균질암심모형중，수-CO2교체구능구재기타개발방식기출상증대압력제도、확대파급체적병제고채수솔；CO2단새시구체잔여원유적주요단새，수단새주요기증가 CO2단새삼류조력적작용。
Aimed at the problem that cannot make sure each slug’s function during water-CO2 alternate flooding in heterogeneous reservoirs, in heterogeneous core model, four contrast experiments for studying water-CO2 alternate flooding and water-CO2 alternate flooding after gas injection with different patterns were carried out. The results indicate that the water-CO2 alternate flooding, continuous gas injection, intermittent injection-production, cyclic gas injection can increase the recovery by 78%, 41.9%, 32.2%, 42.3%. And the water-CO2 alternate flooding after carrying out the last three gas injection patterns can increase the flooding recovery by 9.5%,43.7% and 16.6% again. In heterogeneous core model,water-CO2 alternate flooding can increase pressure gradient,expand swept volume and enhance oil recovery;CO2 slug is main slug to displace residual oil, water slug play a major role in increasing CO2 slug flow resistance.