Gbeibe Reservoir Note Co < Sub > 2 < / Sub > Feasibility Evaluation Of Miscible Flooding Enhance Oil Recovery

Saving energy and reducing emissions is a global warm topic, how to reduce CO2emissions and slow down the greenhouse effect is a common challenge faced by humanity. It is hard and expensive to embed CO2, but using CO2to flooding can enhance substantially oil recovery effectively, which had been got great achievement at home and abroad.To enhance oil recovery of Gbeibe oil reservoir in Syria, research on the mechanism and influence factor about injecting CO2miscible flooding to enhance oil recovery has been done, what is more, feasibility evaluation has been taken about injecting CO2miscible flooding to improve oil recovery about Gbeibe oil reservoir.The main conclusions are as follows after doing research in this paper:(1) Research on phase status of reservoir, and find out that it is heavy oil in the block, whose viscosity and density are big value, small expandability,inject water to EOR may breakthrough, recovery will be low. But if do depletion exploit, the dissolved gas drive power is small, the viscosity will increase quickly, recovery will not high too.(2) Inject CO2swelling test indicate that:After inject49.86%CO2, Bubble point increase to1490.6Psi.Gas oil ration increase to220.51m3/m3, is3.85times of initial value. The viscosity decrease to1.6mPa.s from131.7mPa.s, only1.21%of initial value. These indicate that the oil can dissolve more CO2, and swell capacity is high, inject can enhance oil recovery.(3) Inject CO2multi-contact indicate that, as the number of contact increase, methane, ethane and propane content increase, the oil is transferring with CO2, indicate that CO2is extracting hydrocarbon from the crude oil. After multi-contact with oil, the MMP may be high and low, it depends on the character of oil. MMP between Gbeibe reservoir oil and oil is increase a little after multi-contact.(4) Do slim tube displacement test about the oil of Gbeibe reservoir, including inject CO2, associated gas, air, nitrogen gas. Result shows that only inject CO2can be miscibled, and the MMP is1898.05Psi, less than original reservoir pressure1998.1Psi, MMP of associated gas is2769.5Psi, MMP of air is6452.5Psi, MMP of nitrogen is6555.45Psi. So select CO2to EOR.(5) Do long core displacement test about the oil of Gbeibe reservoir, including inject formation water, CO2, associated gas and polymer. Result shows that inject CO2get the best oil displacement efficiency66.04%, inject polymer and associated gas are better than formation water. Indicate that the oil can dissolve more CO2, which is helpful to EOR.(6) The experiment of aiming to decrease MMP indicate that, after add2%Surfactant MF-Ⅳ, MMP decrease from1898.05Psi to1451.305Psi, decrease the MMP effectively.0.5%HCPV is the best length.