Research On Mobility Improvement For Heavy Oil Accumulation In Kongnan Oilfield

I Icavy oil will became one of the most important resources for the greatly decreasingconventional oil reservoir. This dissertation aims at developing a new self-generating gas agentwhich will release CO2in the reservoir to decrease oil viscosity and surfacc tension and soincrease solution gas drive cflicicncy. Meanwhile, viscosity reducer is employed to enhancethe efTect.Through thorough analysis towards crude oil and reservoir property of Kongnan oil field,this passage has selected the best fitting viscosity and self-generating gas agent for theaccumulation. Plus, several other questions like these two agents compromised efTect aboutviscosity reduction, the apparatus need to installed and related geologic restrictions were alsodiscussed.Hleven viscosity reducers and the sclf-gcncrating gas agent got tested in experiments andresults show that all viscosity reducers behave good viscosity reducing effect and greatcompatibility with the reservoir, while the gas generating agent (DYSQ-III) yields advantageslike huge gas generating rate, low formation damage and ability of controlling temperature.Compared the self cerating agent to the pre-existing viscosity reducer, the former has a betterdisplacement eiffciency and stimulation effect. However, to the isolated self-generating gasagent (DYSQ-111) or the viscosity reducer GSY-1with hutT and puff，the introduction ofviscosity rcduccr can greatly cnhancc displacement ciffcicncy.