Abstract:

Based on field information,the reservoirs,which are suitable to cold recovery,are those whose formation are loose,gravel content is low,dead oil viscosity is 500～50 000 mPa.s,solution gas concentration in crude oil is about 10 m³/t,reservoir pressure is higher than 2 MPa,formation depth is 200～1 000 m.The effects of edge water and gas cap distribution on cold recovery of heavy oil are great,which are important factors to deploy oil wells and determine perforation interval and discharge capacity.This techique has extensive adaptability in such reservoirs as loose sandstone with solution gas.It is very important for the deployment of this technique to make clear the effects of geologic factors on cold recovery and establish relevant technical tactics.

Key words: heavy oil, cold recovery, wormhole, foamy oil