The Laboratory Experimental Research Of Multiple Profile Control Effect In Heterogeneous Reservoirs

With the development of profile control and the need for oilfield development in the form, the workload of profile control aimed at severely heterogeneous reservoir is increasing annually and the recurrence rate is getting higher and higher, whereas the effects of profile control are not entirely as desired. The static and dynamic adsorption characteristicin of profile control agent in the rock surface and the influence on the effects of multiple profile control by adjusting the concentration of profile control, injection rate of profile control agent and the volume of subsequent water have been studied in order to confirm the results of multiple profile control.Based on the evaluation research about the mechanism and effects of multiple profile control through numerous physical simulation experiments, the static and dynamic absorbance for profile control agent in rocks increased as the concentration of profile control agent and the water salinity increased. Both of this two profile control agents have very good sealing effect, blocking rates are generally above 90%. The duration time is also relatively long and the blocking rates can reach 80% above when water injection is 10PV. Compared the two, profile control agent I is better than the profile control agentⅡ. The profile control effect is turning good as the concentration, injection rate of profile control agent and the volume of subsequent water increased. The experimental research of the multiple profile control in non-homogeneous area model show that in the first profile control the reserve recovery can increase by 5.1%.However the effects of profile control are still inadequate, the produced liquid of individual wells is still too high and water cut rises rapidly. In the second profile control ,the optimized effects can be obtained, the injection rate is 1/3 times more than first profile control and the sequent water injection increases to 1.6 times of the first. At the same time, relative water content has been further improved, the obvious effects increasing oil and decreasing water has been obtained, the water cut has decreased evidently and the degree of reserve recovery has increased by 13.11%.The multiple profile control has played a rather important role in heterogeneous reservoir and this method has achieved its expected goal. All of this not only affords theory foundation and consultation for the oilfields but also provides references for the development of severely heterogeneous oilfields.