Field test for improving swept volume by CO2 flooding in Yanchang Oilfield
After many years with water injection development in block J,the effect of oil well stimulation be-comes worse,and only the oil wells in the direction of sand body distribution is effective.In order to im-prove the development effect,the development method of ultra-low permeability reservoir is explored,and the CO2 flooding swept volume is studied through its pilot test,and the rapid seepage along the advantageous channel is inhibited by the alternate injection of water and gas.Field practice shows that after the implemen-tation of alternating water and gas injection,the wells in block J in other directions besides the direction of sand body distribution also began to show the effect of increasing production.Especially after the subsequent water plug injection,the monthly oil production of the 4#oil well increased from 64 t to 102 t,indicating that the alternating water and gas injection expanded the affected volume and achieved good development re-sults.This study provides a good reference for improving oil recovery in similar reservoirs.
Yanchang Oilfieldultra-low permeabilityCO2 floodingswept volumefield test
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