| Air-foam flooding has two advantages both including air injection and foam injection.It is a new creative technique for enhanced oil recovery.It has two advantages including airinjection and foam injection, so it integrates both functions of profile controlling and displacement.Aiming at the situation that being a seriously inhomogeneous reservoir and poor water drive effect of LiaoHe oilfield Huan26 block,four researches about air-foam drive have been made in this paper,which are included as follows:Firstly,low-temprature oxidation experiment on the oil sample of DuJiaTai layer has been conducted,the results can been used to study the oil’s low-temprature oxidation characters, including the analysis on composition variation of oil sample and air sample. Secondly, proper foaming agent can be used in DuJiaTai reservoir are screened based on the evaluation of air-foam system,and factors affect the foaming characters have been furtherly studied.one sample named HS-403 can be used in this block properly.Thirdly, effect of air-foam drive are evaluated by conducting air-foam drive experiment, also, concentration and slug size about foaming agent have been optimized in this experiment.Fourtuly,Air foaming driving pilot test plan have been made combined with geological characteristics and experiment results.Results of these researches show that that the oil sample of Huan26 block is capable of oxidization, and abundant of oxygen can be consumed under the reservoir temperature.Compared with air driving, air foaming driving can enhance the displacement efficiency sharply,prolong the gas breakthrough time and reduce the oxygen content of gas after breakthrough. Based on these researches,we suppose that air foaming driving is very proper to enhance the revovery in Block26 DuJiaTai reservoir. |
