Abstract:

There are multiple media characteristics in fracturecavity carbonate rock reservoir，its accumulative bodies are discontinuous in spatial distribution，the relationship of oil and water is complicated，there is an essential difference between the flowing mechanisms and the carbonate rock and sandstone reservoirs，which brings about difficult production.When gush can not be done by means of oil reservoir itself energy，and pumping can not lift crude oil up to surface，the water injection to replace oil is carried out to enhance formation energy to realize gush.Aiming at the water injection to replace oil technology in fracture cavity carbonate rock reservoir being just probed，there is no available means being able to be used directly，the technology should be practiced on the basis of dividing the reservoir into fracturecavity units by dynamically analyzing and predicting the reservoirs.In order to study the flow mechanism and water injection to replace oil mechanism for fracturecavity carbonate reservoir，a suitable way is explored and physical model established to experimentally study the recovery dynamic characteristics，the dynamic change of injection and recovery is obtained from dimensionless deliverability，dimensionless bottom hole flow pressure and water cut change curves.

Key words: fracturecavity carbonate rocks, rate of water content, water injection to replace the oil, mechanism, physical model