Experimental study on the effect of CO2 injection on high pressure physical properties of formation oil
The high pressure physical properties of CO2 injection formation oil are the basis for analyzing the mechanism of CO2 displacement and storage and optimizing its technical scheme.In the M block of DQ oilfield,simulated formation oil was prepared with dehydrated crude oil and natural gas samples to explore the effect of CO2 injection on the high pressure physical properties of formation oil.The results show that CO2 injection can increase the saturation pressure and dissolved gas-oil ratio of formation oil,increase the volume coefficient and expansion rate,and reduce the density and viscosity of formation oil.The greater the CO2 injection,the greater the favorable change degree of formation oil high pressure physical properties.From the perspective of physical property change of formation oil and economy,when CO2 injection is used to produce crude oil in block M,the proportion of CO2 injection is appropriate to be 1.00～1.40,and the corresponding gas injection pressure is 17～20 MPa.
CO2 floodingphysical property of crude oilinjection volumeinjection pressure
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